TWI411355B - Load control device - Google Patents

Abstract

A load control device is provided with: a main switching unit for controlling the supply of power to a load, said main switching unit having one gate, to which a control voltage is applied, for each connection point, having a main switching element with a horizontal dual-gate transistor that incorporates a withstand voltage section, and being connected in series between an alternating current power source and the load; an auxiliary switching unit for controlling the supply of power to the load when the main switching unit is in a non-conductive state, said auxiliary switching unit comprising an auxiliary switching element that has a thyristor structure; a control unit for controlling the main switching unit and the auxiliary switching unit;a first power source for supplying a voltage to the control unit; a second power source for supplying the power of the first power source when the supply of power to the load is interrupted; and a third power source for supplying power to the first power source when power is being supplied to the load while the main switching unit or the auxiliary switching unit is closed. When power is being supplied to the load and the voltage input to the third power source reaches a prescribed threshold, the control unit causes the main switching unit to conduct power for a first period of time, and causes the auxiliary switching unit to conduct power for a second period of time when the main switching element is in a non-conductive state.

Description

Load control device

The present invention relates to a two-wire type load control device that is connected in series between an AC power source and a load of a lighting device or the like.

Previously, a load control device for a lighting device using a contactless switch element such as a triac or a thyristor has been put to practical use. From the viewpoint of saving wiring, the load control devices are generally two-wire wiring, and are connected in series between the AC power source and the load. The problem with the load control device thus connected in series between the AC power source and the load is how to ensure its own circuit power.

The load control device 50 of the first prior art shown in FIG. 44 is connected in series between the AC power supply 2 and the load 3, and the main opening/closing unit 51, the rectifying unit 52, and the control unit 53 supply a stable power supply to The first power supply unit 54 of the control unit 53 supplies the electric power to the first power supply unit 54 when the electric power is supplied to the load 3 when the electric power is supplied to the load 3 while the power supply to the load 3 is stopped. The third power supply unit 56 and the auxiliary opening and closing unit 57 that receives a minute current in the load current are configured. The main switching element 51a of the main opening and closing portion 51 is constituted by a bidirectional triode.

When the load control device 50 that is not supplying power to the load 3 is turned off, the voltage applied from the AC power supply 2 to the load control device 50 is supplied to the second power supply unit 55 via the rectifying unit 52. The second power supply unit 55 is a constant voltage circuit composed of a resistor and a Zener diode. At this time, it is set to flow on the load 3 The current is a minute current, and the load 3 does not cause a failure, the current consumption of the control unit 53 is small, and the second power supply unit 55 maintains a high impedance.

On the other hand, when the load control device 50 that supplies power to the load 3 is turned on, the third power supply unit 56 is turned on according to a control signal from the control unit 53, and the impedance of the load control device 50 is lowered. The amount of current flowing through the load 3 increases, and the current flowing through the third power supply unit 56 also flows to the first power supply unit 54, and the buffer capacitor 54a starts charging. When the charging voltage of the snubber capacitor 54a is higher than a predetermined threshold value, the Zener diode 56a constituting the third power supply unit 56 is broken and the current starts to flow, whereby the current flows to the auxiliary opening and closing portion 57. The gate is such that the auxiliary opening and closing portion 57 is turned on (on state). As a result, the current flowing from the rectifying unit 52 to the third power source unit 56 is turned to the auxiliary opening and closing unit 57, and further flows to the gate of the main switching element 51a of the main opening and closing unit 51, so that the main opening and closing unit 51 is turned on (closed state). Therefore, almost all power is supplied to the load 3. When the main opening/closing portion 51 is temporarily turned on (closed state), the current continues to flow, but when the alternating current reaches the zero-crossing point, the main switching element 51a self-extinguishes, so that the main opening and closing portion 51 becomes non-conductive (open state). When the main opening/closing unit 51 is rendered non-conductive (open state), the current flows from the rectifying unit 52 to the first power supply unit 54 via the third power supply unit 56 again, thereby ensuring the operation of the own circuit power supply of the load control device 50. In other words, the operation of securing the own circuit power supply of the load control device 50, the conduction of the auxiliary opening and closing unit 57, and the conduction operation of the main opening/closing unit 51 are repeated every 1/2 cycle of the AC power supply.

The load control device 60 of the second prior art example shown in FIG. 45 is connected in series between the AC power source 2 and the load 3, and is provided by the main opening/closing unit 61, the rectifying unit 62, and the control unit 63 for supplying a stable power source. The first power supply unit 64 of the control unit 63 supplies power to the first power supply unit 64 when the electric power is supplied to the load 3 in the second power supply unit 65 that supplies electric power to the first power supply unit 64 while the power supply is stopped. The third power supply unit 66 and the zero-cross detecting unit 67 that detects the zero cross point of the load current are configured. A metal oxide semiconductor field effect transistor (MOSFET) is used as the main switching element 61a of the main opening and closing portion 61, and an incandescent lamp is used as a control target load.

When power is supplied to the load 3, the main switching element 61a of the main opening/closing unit 61 is turned on only during the period corresponding to the externally input dimming level, and the zero-crossing detecting unit 67 detects the zero-crossing point of the voltage ( The main switching element 61a is turned on (closed state), and the main switching element 61a is rendered non-conductive (open state) after the lapse of the above period. While the main opening/closing portion 61 is not conducting (open state), the own circuit power supply of the load control device 60 is secured in the same manner as in the first prior art example described above. When the main opening/closing unit 61 is non-conductive (open state), the zero-cross detecting unit 67 detects the zero-crossing point again, and repeats the operation of turning on the main switching element 61a (closed state) every 1/2 cycle of the AC power supply.

However, in any of the above-described load control devices 50 and 60, in order to stop the supply of electric power to the load 3, the second power supply units 55 and 65 are provided to operate the control units 53 and 63, and the first power supply unit must be provided. 54, 64 Continue to supply electricity. Therefore, although the current is small but continues to flow to the load 3, the specification of the connectable load 3 is limited.

In the case of the load control device 50 of the first prior art, when the main switching element of the main opening/closing unit 51 is a bidirectional triode or a thyristor, in order to reduce the noise generated when the power is supplied to the load 3, and It is necessary to prevent a failure caused by the noise transmitted from the power source 2 when the power supply to the load 3 is stopped, and it is necessary to provide a filter. However, the size of the coil 58 constituting the filter and the heat generated by the coil become The problem is that it is difficult to achieve miniaturization of the load control device.

In the load control device (third prior example) disclosed in Japanese Laid-Open Patent Publication No. Hei. No. 2006-92859, the main switching element of the main opening and closing unit is used, for example, in order to reduce the noise caused by the load control device. Further, a second switch portion having a larger on-resistance than the main switching element (first switch portion) is provided, and the first switch portion is turned on after the second switch portion is turned on. However, in the third prior example as described above, the number of switching elements is increased, the circuit configuration becomes complicated, and the control of the timing at which the switch is turned on becomes complicated.

In addition, in recent years, the electric lamp type fluorescent lamp has been widely used in accordance with the demand for energy saving. However, when the main switching element 61a of the main opening/closing unit 61 is a transistor as in the load control device 60 of the second prior art, the load is applied. It is defined as a load in which the load current such as an incandescent lamp is in phase with the load voltage (power factor is 1). Therefore, there is a need for a two-wire type load control device in which the types of loads such as a fluorescent lamp and an incandescent lamp are not limited.

Further, the bidirectional triode or the transistor used as the main switching element of the main opening and closing portion is made of Si, and is generally a vertical type in which current flows in the longitudinal direction of the element. In the case of a bidirectional triode, since a PN junction is present on the energization path, loss occurs when the barrier is exceeded during energization. Further, in the case of a transistor, since it is necessary to connect two elements in the reverse direction and the resistance of the carrier concentration layer which is a voltage withstand layer is high, loss occurs during energization. Due to these losses, the amount of heat generated by the main switching element itself is increased, and a large heat sink is required, which hinders the increase in capacity and size of the load control device. In general, such a load control device is housed in a metal box or the like provided on a wall surface. However, in the conventional load control device, there is a limit to miniaturization, and therefore, the size of a box that is generally used nowadays The load cannot be used together with the control device and other sensors or switches. Therefore, in order to enable the load control device and other sensors, switches, and the like to be provided in a box of a general size, the load control device is required to be further miniaturized.

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2006-92859

The present invention has been made to solve the problems of the above-described prior art, and an object of the invention is to provide a heat generation type capable of reducing the amount of heat generated when a load is applied to a load, thereby achieving downsizing and increasing the capacity, and further, there is no need to limit a fluorescent lamp or an incandescent lamp. Load control device for the power factor of the load.

Another object of the present invention is to provide a load control device which can reduce the number of switching elements on the one hand and accurately control the opening and closing time point on the other hand.

Another object of the present invention is to provide a load control device that can eliminate the configuration corresponding to the second power supply unit and prevent a small amount of current from flowing in the load during non-operation.

A load control device according to a first aspect of the present invention is a two-wire load control device that is connected in series between an AC power source and a load, and includes a main opening and closing unit that is connected in series to a power source and a load, including 1 a gate for applying a control voltage to the connection point, and comprising a main switch element of a horizontal double-gate transistor structure having one withstand voltage portion for supplying power to the load control; assisting opening and closing The auxiliary switching element including the thyristor structure supplies the load control power supply when the main opening/closing portion is non-conductive; the control unit controls the opening and closing of the main opening and closing unit and the auxiliary opening and closing unit; and the first power supply unit Both ends of the main opening and closing portion are supplied with electric power via the rectifying portion, and a stable voltage is supplied to the control portion. The second power supply unit supplies electric power from both ends of the main opening and closing portion via the rectifying portion to stop the electric power to the load. At the time of supply, a power source is supplied to the first power supply unit; a drive circuit drives the main opening/closing unit; and a third power supply unit is provided in the main opening/closing unit or the auxiliary unit. When the closed portion is closed, when the electric power is supplied to the load, the first power supply unit supplies power, and the voltage detecting unit detects the voltage input to the third power supply unit, and the control unit performs the following control. In other words, when the voltage detecting unit detects that the voltage input to the third power supply unit has reached a predetermined threshold value, the main opening/closing unit is turned on for the first predetermined time. When the main opening/closing portion is non-conductive, the auxiliary opening and closing portion is turned on for the second predetermined time.

According to the first aspect of the present invention, the main switching element of the main opening/closing unit of the two-wire type load control device is configured to be a semiconductor chip excellent in low loss (low resistance) efficiency under AC control. Since the double gate transistor structure is formed, the load control device can be reduced in size and capacity.

A load control device according to a second aspect of the present invention includes a main opening/closing unit including a switching element of a transistor structure, a supply of a load control power source, and an auxiliary opening and closing unit including a switching element of a thyristor structure. The control unit controls the supply of the load control power source when the opening and closing unit is not conducting, and the control unit controls the opening and closing of the main opening and closing unit and the auxiliary opening and closing unit, and the first power supply unit supplies electric power from both ends of the main opening and closing unit via the rectifying unit. Supplying a stable voltage to the control unit; the second power supply unit supplies electric power from both ends of the main opening/closing unit via the rectifying unit, and supplies power to the first power supply unit when power supply to the load is stopped; The power supply unit supplies power to the first power supply unit when power is supplied to the load while the main opening/closing unit or the auxiliary opening/closing unit is closed, and the third power supply unit includes the input voltage. a voltage detecting unit and a zero-crossing detecting unit that detects a zero-crossing point of the load current, wherein the control unit enters a control that is When the electric power is supplied, the main opening/closing unit is turned on only for a period of time in which the first predetermined time and the third predetermined time are repeated, and the first predetermined time is that the voltage input to the third power supply unit has been detected from the voltage detecting unit. The counting is started from the predetermined threshold value, and the third predetermined time is a half cycle after the zero-crossing detecting unit detects the zero-crossing point of the load current and starts counting, and is smaller than the load current.

According to the second aspect of the present invention, when the voltage detecting unit detects that the voltage input to the third power supply unit has reached a predetermined threshold value, the control unit turns on the main opening/closing unit in the first predetermined time (closed state). Therefore, the autonomous opening and closing portion supplies power to the load for most of the half cycle of the commercial power source. In addition, even if the third predetermined time elapses, the control unit causes the main opening/closing unit to be non-conductive (turned on), and therefore, even at a time when the first predetermined time starts, for example, at a low load The main opening and closing portion has become non-conductive before the load current is zero. Thereby, the main opening and closing portion does not exceed the zero crossing of the load current to be turned on.

A load control device according to a third aspect of the present invention includes a main opening and closing unit including a switching element having a transistor structure, a supply of a load control power source, and an auxiliary opening and closing unit including a switching element of a thyristor structure. The control unit controls the supply of the load control power source when the opening and closing unit is not conducting, and the control unit controls the opening and closing of the main opening and closing unit and the auxiliary opening and closing unit, and the first power supply unit supplies electric power from both ends of the main opening and closing unit via the rectifying unit. The third power supply unit supplies power to the first power supply unit when the power is supplied to the load when the main open/close unit or the auxiliary open/close unit is closed, and the receiving unit receives the power from the first power supply unit. a control signal transmitted from the outside; and an independent power supply unit that rectifies the control signal received by the receiving unit to supply electric power to the first power supply unit.

According to the third aspect of the present invention, the independent power supply unit rectifies the control signal received by the receiving unit to supply electric power to the first power supply unit. Therefore, the configuration corresponding to the second power supply unit of the prior art can be discarded. and, The independent power supply unit supplies power to the first power supply unit independently of the power supply to the load. Therefore, it is possible to prevent a small current from flowing through the load during non-operation, and it is possible to expand the use range of the connectable load.

The above described features and advantages of the present invention will be more apparent from the following description.

First, the main switching element used in the load control device of the present invention described below will be described. Fig. 1A is a circuit diagram of a main switching element having a horizontal double gate crystal structure having one withstand voltage portion, and Fig. 1B is a circuit diagram showing a case where two MOSFET type transistor elements are connected in opposite directions. 2 shows a vertical cross-sectional configuration of a main switching element of a horizontally-mounted double-gate transistor structure.

In the configuration shown in FIG. 1B, the source electrodes S of the two transistor elements are connected to each other and grounded (lowest potential portion), and the source electrode S and the gate electrode (or referred to as a gate) G1. There is no need for a withstand voltage between G2, and a withstand voltage is required between the gate electrodes G1, G2 and the drain electrodes D1, D2, so two withstand voltage portions (for example, the withstand voltage distance) are required. Hereinafter, a position where a distance for withstanding voltage is provided is used as a withstand voltage portion. Since the two transistor elements operate based on the gate signals based on the source electrodes, they can be driven by inputting the same driving signals to the gate electrodes G1 and G2 of the respective transistor elements. On the other hand, as shown in FIG. 2, the configuration of the main switching element of the horizontally-mounted double-gate transistor structure is a structure in which a bidirectional element having a portion where the withstand voltage is maintained and having little loss is realized. On the other hand, with The element having such a configuration must be controlled based on the voltages of the electrodes D1 and D2, and it is necessary to input different driving signals to each of the two gate electrodes G1 and G2 (hence, it is called a double gate transistor structure).

(First embodiment)

3 is a circuit diagram showing a basic configuration of the load control device 1 according to the first embodiment of the present invention, and FIG. 4 is a time chart showing signal waveforms of respective portions of the load control device 1. Further, the specific configuration of the drive circuit 10 is not shown here, and the specific configuration of the drive circuit 10 will be described in the following embodiments.

The load control device 1 according to the first embodiment shown in FIG. 3 is connected in series between the AC power supply 2 and the load 3, and is composed of a main opening/closing unit 11 that controls the supply of the power to the load 3, and the drive circuit 10 The main opening and closing unit 11 is driven; the rectifying unit 12; the control unit 13 controls the entire load control device 1; the first power supply unit 14 supplies a stable power supply to the control unit 13, and the second power supply unit 15 stops the load 3. In the state in which the electric power is supplied, electric power is supplied to the first power supply unit 14 , and when the electric power is supplied to the load 3 , the third power supply unit 16 supplies electric power to the first power supply unit 14 , and the auxiliary opening and closing unit 17 receives the load current. A small current in the middle. Further, the third power supply unit 16 is further provided with a voltage detecting unit 18 that detects a voltage input to the third power supply unit. The main opening and closing portion 11 includes the main switching element 11a of the horizontal double gate crystal structure described above, and the auxiliary opening and closing portion 17 includes an auxiliary switching element of a thyristor structure.

In other words, in a state where the load 3 is not supplied with electric power, the current flows from the power source 2 to the second via the rectifying unit 12 in a state where the load control device 1 is turned off. Since the power supply unit 15 has a small current flowing through the load 3, the current is suppressed to a low level, and the load 3 does not malfunction, and the impedance of the second power supply unit 15 is maintained at a high value.

When the electric power is supplied to the load 3, the impedance of the third power supply unit 16 is lowered, and the current flows to the circuit side inside the load control device 1, and the snubber capacitor 25 of the first power supply unit 14 is charged. As described above, the third power supply unit 16 is provided with a voltage detecting unit (charge monitoring unit) 18 for detecting the voltage input to the third power supply unit 16. When the voltage detecting unit 18 detects that the voltage input to the third power supply unit 16 has reached a predetermined threshold value, the voltage detecting unit 18 outputs a predetermined detection signal. When receiving the detection signal from the voltage detecting unit 18, the control unit 13 outputs a first pulse signal (main opening/closing unit drive signal) for turning on the main opening/closing unit 11 to the drive circuit 10 so that the main opening/closing unit 11 is first. Conducted within the specified time (becomes closed). In the configuration example shown in FIG. 3, a first pulse output unit (main opening/closing unit) that is configured in a hardware type using a dedicated integrated circuit (IC) or the like is provided as a part of the control unit 13 The drive signal output unit 19 is configured to directly output the first pulse signal based on the detection signal from the voltage detecting unit 18. Alternatively, the configuration is not limited to the configuration shown in the drawings, and the output from the voltage detecting unit 18 may be input to the main control unit 20 including a central processing unit (CPU) or the like, and the software (software) The first pulse signal is outputted. The first predetermined time for turning on the main opening/closing unit 11 is preferably set to be slightly shorter than a half cycle of the commercial frequency power supply.

Next, after the first predetermined time, the main opening is started. When the closed portion 11 is not in the ON state (open state), the control unit 13 turns on the auxiliary opening and closing portion 17 only in the second predetermined time (for example, several hundred microseconds). This operation causes the main opening and closing portion 11 to be non-conductive. When the load current starts to flow to the auxiliary opening and closing portion 17, the flow continues to flow to the auxiliary opening and closing portion 17 until the load current becomes zero. FIG. 3 shows an example in which the second pulse output unit 21 that outputs the second pulse signal (auxiliary opening and closing unit drive signal) for the second predetermined time is provided as a part of the control unit 13 so that the main opening and closing is detected. After the portion 11 is not turned on (open state), the drive signal is applied to the auxiliary opening and closing portion 17 only for the second predetermined time. Further, the second pulse signal may be output in a soft manner, or a diode or a capacitor may be used to achieve the same operation in the delay circuit.

Referring to FIG. 4, after the charging of the snubber capacitor 25 is completed, the autonomous opening and closing portion 11 supplies power to the load 3 for most of the half cycle of the commercial power source, and then the energization current is reduced. The auxiliary opening and closing unit 17 supplies electric power to the load 3. Further, the auxiliary opening and closing portion 17 includes the auxiliary switching element 17a of the thyristor structure, and therefore becomes non-conductive (open state) at a time point (zero-crossing point) at which the current value is zero. When the auxiliary opening and closing unit 17 is rendered non-conductive (open state), the current flows again to the third power supply unit 16, so that the above operation is repeated every half cycle of the commercial power source. These operations are performed on the load current. Therefore, even if the main opening and closing portion 11 is constituted by the main switching element 11a having a transistor structure, the power factor of the load 3 is not limited to 1, and the fluorescent lamp can be realized. And a two-wire load control device of any of the incandescent lamps. Further, in the first embodiment, Since the main opening and closing portion 11 is constituted by the main switching element 11a of the horizontal double-gate transistor structure, it is necessary to limit the voltage withstanding portion of the transistor element to one place, and it is possible to reduce the amount of heat generated by the main switching element itself when the load is energized. Thereby, the size and capacity of the load control device can be simultaneously achieved.

3 shows an example in which the current detecting unit 22 for detecting the current flowing through the auxiliary opening and closing unit 17 is provided. However, the current detecting unit 22 functions as a frequency drift or an excessive load. In this case, the auxiliary opening and closing unit 17 is again switched to the main opening and closing unit 11 to switch the operation of the load current path, thereby protecting the auxiliary opening and closing unit 17 from damage. Therefore, the current detecting unit 22 is not necessarily required, and may be provided as needed.

(First embodiment)

Next, a first embodiment of the drive circuit 10 used in the load control device 1A according to the first embodiment of the present invention will be described with reference to FIG. 5 and FIG. Fig. 5 is a circuit diagram of a load control device 1A of the first embodiment, and Fig. 6 is an enlarged view of the drive circuit 10 of Fig. 5.

As shown in FIGS. 5 and 6, the drive circuit 10 for driving the main opening and closing portion 11 is an optically insulating semiconductor switching element such as two sets of photo couplers provided corresponding to the double gates of the main switching elements 11a. 101, 102, etc. The drive signals from the control unit 13 are input to the light-emitting portions 101a and 102a of the light-insulated semiconductor switching elements 101 and 102, respectively. When there is a drive signal input, the light-emitting portions 101a and 102a of the light-insulated semiconductor switching elements 101 and 102 convert their electric power into light energy and output them. If light from the light-emitting portions 101a, 102a is incident on the light-insulating semiconductor switching elements 101, 102 The light receiving units 101b and 102b perform photoelectric conversion by the light receiving units 101b and 102b to convert light energy into electric energy (that is, power generation). The light receiving units 101b and 102b are connected to each other, that is, the electric power generated here is connected to the main switching element 11a of the main opening and closing unit 11 based on the point at which the AC power source (commercial power source) and the load are connected (see FIG. 6). The gate portion applies a positive potential.

The control unit 13 outputs a drive signal to cause the light-emitting portions 101a and 102a of the light-insulated semiconductor switching elements 101 and 102 to emit light, whereby the drive signal is easily input to the gate electrode of the main switching element 11a of the main opening/closing portion 11 having different reference potentials. Therefore, the main switching element 11a of the main opening and closing portion 11 can be brought into an on state (closed state). Further, since the light-emitting portions 101a and 102a of the optically-insulating semiconductor switching elements 101 and 102 are electrically insulated from the light-receiving portions 101b and 102b, the driving signal is not input to the main switching element as long as light is not output from the light-emitting portions 101a and 102a. Gate electrode of 11a. In other words, the gate electrode of the main switching element 11a is supplied with electric power which is electrically insulated from the control unit 13 (or the first power supply unit 14 of the load control device 1A) differently from the drive signal output from the control unit 13. Further, on the one hand, the insulation can be maintained by the drive signal from the control unit 13, and the optically-insulating semiconductor switching elements 101 and 102 connected to the gate electrode of the main switching element 11a can be easily and surely turned on and off.

7 and 8 show a modification of the drive circuit 10 shown in Figs. 5 and 6 . In this modification, the light-emitting portions 101a and 102a of the optically-insulating semiconductor switching elements 101 and 102 such as a photocoupler are connected in series. Thereby, the current value flowing through the driving circuit 10 can be made to be about 1/2, thereby reducing the driving. The amount of power consumption in the moving circuit 10.

(Second embodiment)

Next, a second embodiment of the drive circuit 10 used in the load control device 1A according to the second embodiment of the present invention will be described with reference to FIG. 9 and FIG. Fig. 9 is a circuit diagram of a load control device 1B according to the first embodiment, and Fig. 10 is an enlarged view of the drive circuit 10 of Fig. 9.

As shown in FIG. 9 and FIG. 10, the drive circuit 10 for driving the main opening/closing section 11 is composed of two sets respectively corresponding to the double gates of the main switching elements 11a and the first of the load control device 1B. The diodes 101a and 101b connected to the power supply unit 14 have one end connected to each of the power lines and the other end connected to the capacitors 102a and 102b of the diodes 101a and 101b, and the connection between the diodes 101a and 101b and the capacitors 102a and 102b. The switching elements 103a and 103b are driven between the respective gate terminals of the main switching element 11a of the main opening and closing portion 11. The drive switching elements 103a and 103b are turned on/off by a signal from the control unit 13. Further, the drive switching elements 103a and 103b are configured such that the switch portion is insulated from the operation portion. The configuration of the drive switching elements 103a and 103b is not particularly limited, and various types can be used as described below.

According to this configuration, the first power supply unit 14 of the load control device 1A is connected to the other end of the capacitors 102a and 102b whose one end is connected to the power line via the diodes 101a and 101b, thereby forming the capacitors 102a and 102b. A simple power supply based on the potential of the power line. The charging of the capacitors 102a, 102b is performed by the internal power supply of the load control device 1B from the side where the power supply voltage in the power line is higher. The current flowing to the power line on the side where the voltage is low charges the capacitor connected to the lower voltage side. At this time, the capacitor connected to the side with the higher voltage is not charged, and therefore, the capacitor is repeatedly charged every cycle of the power supply frequency. The capacitor on the opposite side is charged at a time point opposite to the above in the relationship of the potential of the power line.

When the main switching element 11a of the horizontally-mounted double-gate transistor structure is turned off, it is necessary to apply a voltage to the gate of the main switching element 11a with reference to a point at which the power line is connected (see FIG. 10). Here, when the drive switching element 103a or 103b connected to the gate electrode of the main switching element 11a of the main opening and closing unit 11 is turned on according to a signal from the control unit 13, the power supply line is applied to the gate terminals of the main switching element 11a. The reference is charged to the voltage of the capacitor, and therefore, the main switching element 11a is turned on (closed state). When the main switching element 11a is temporarily turned on, the voltage between the terminals of the main switching element 11a becomes extremely small. Therefore, the power from the load control device 1B can be used to pass through the diodes 101a and 101b and the driving switching elements 103a and 103b. The applied voltage is maintained to maintain conduction.

In this embodiment, since the drive circuit 10 and the first power supply unit 14 are not insulated, the drive power can be efficiently supplied. The capacitors 102a and 102b are only required to temporarily determine the potential of the gate electrode when the main switching element 11a is turned off, so that the shapes and capacities of the capacitors 102a and 102b can be small. In addition, in FIG. 9, power is supplied to the drive circuit 10 from the output of the first power supply unit 14, but electric power may be supplied from a relatively stable power supply unit such as the input of the first power supply unit 14.

11 and 12 show the specifics of the drive circuit 10 of the second embodiment. In the configuration example, as the drive switching elements 103a and 103b, an optically insulating semiconductor switching element such as a photocoupler or a photo relay is used. When a drive signal from the control unit 13 is input, an optical signal is output from the light-emitting portion of the optically-insulating semiconductor switching element, and when the optical signal is incident on the light-receiving portion, the light-receiving portion is turned on and the current from the first power supply unit 14 is The drive signal) flows into the main switching element 11a. Since the light-emitting portion is electrically insulated from the light-receiving portion, the drive signal is not input to the gate electrode of the main switching element 11a as long as the light is not output from the light-emitting portion. Therefore, according to the drive signal from the control unit 13, the insulation can be maintained, and the drive switching elements 103a and 103b connected to the gate electrode of the main switching element 11a can be easily and surely turned on and off.

FIG. 13 and FIG. 14 show a modification of the drive circuit 10 shown in FIGS. 11 and 12. In this modification, the light-emitting portions of the drive switching elements 103a and 103b using the optically-insulating semiconductor switching elements such as a photocoupler or a dimming relay are connected in series. Thereby, the current value flowing in the drive circuit 10 can be made approximately 1/2, so that the amount of power consumption in the drive circuit 10 can be reduced.

Another modification of the drive circuit 10 shown in Figs. 11 and 12 is shown in Figs. 15 and 16 . In this modification, the light-emitting portions of the drive switching elements 103a and 103b using the optically-insulating semiconductor switching elements such as the photocoupler or the dimming relay are connected in series, and the switching elements 103a and 103b and the main opening and closing unit 11 are driven. Capacitors 104a and 104b are connected between a connection point of the gate electrode connection of the main switching element 11a and a power line which serves as a reference for the gate electrode. In addition, as shown in FIG. 11 and FIG. 12 Capacitors 104a and 104b are added to the configuration example of the drive circuit 10.

As shown in this modification, the capacitors 104a and 104b are added, whereby the voltage applied to the gate electrode of the main switching element 11a can be alleviated by the capacitors 104a and 104b when the switching elements 103a and 103b are turned on and off. The irritable change makes it possible to prevent the main switching element 11a from being suddenly turned on and off. As a result, noise generated by turning on and off the main switching element 11a of the main opening and closing portion 11 can be reduced, so that the noise filter can be reduced or omitted. That is, a coil or a capacitor that functions as a noise filter can be omitted as compared with the configuration of the previous example shown in FIG. 44 or FIG. 45.

In the coil constituting the noise filter, the coil is also large as the rated current of the load control device increases, so that the size of the load control device can be reduced as long as the coil can be omitted. Further, the capacitor constituting the noise filter has less restriction on the size of the load control device than the coil, but since the capacitor is present, the impedance of the load control device in the off state can be reduced. With this, it is not good for the closed state of the load control device. Further, even in a state where the load control device is off, an alternating current flows through the capacitor, whereby the load may be broken or the like at the time of disconnection. Therefore, if the capacitor for the noise filter can be omitted from the load control device, it is preferable for the two-wire type load control device.

(Third embodiment)

Next, a load control device 1B according to a third embodiment of the first embodiment of the present invention will be described with reference to FIG. 17 and FIG. Figure 17 is a circuit diagram of the load control device 1B of the third embodiment, and Figure 18 is a circuit diagram of Figure 17 An enlarged view of the drive circuit 10.

In the third embodiment, the drive circuit 10 of the main opening/closing unit 11 is a transformer (electromagnetic coupling element) 103, a rectifying circuit 104a, 104b, and an oscillating circuit 105 that transmit electric power by electromagnetic coupling such as a high-frequency insulating transformer or the like. And so on. The primary side coil 103a of the transformer 103 is connected to the oscillation circuit 105, and the oscillation circuit 105 is connected to the control unit 13. When the drive signal from the control unit 13 is input to the oscillation circuit 105, the oscillation circuit 105 oscillates only during the application of the drive signal, thereby generating AC power. When an alternating current generated by the oscillation circuit 105 flows in the primary side coil 103a of the transformer 103, an electromotive force is generated in the secondary side coils 103b and 103c by electromagnetic induction. On the secondary side of the transformer 103, the electromotive force generated in the coils 103b and 103c is an alternating current. Therefore, after the rectification by the rectifier circuits 104a and 104b, the electromotive force is input to the gate electrode of the main switching element 11a of the main opening and closing unit 11. Further, the rectifier circuits 104a and 104b are connected such that a positive potential is applied to the gate electrode of the main switching element 11a with reference to a point at which the commercial power source and the load are connected. Further, since the primary side coil 103a of the transformer 103 is electrically insulated from the secondary side coils 103b and 103c, the drive signal is not input to the main switching element 11a as long as no current flows in the primary side coil 103a of the transformer 103. Gate electrode. That is, the gate electrode of the main switching element 11a is supplied with electric power which is electrically insulated from the control unit 13 unlike the drive signal output from the control unit 13.

As described above, in the third embodiment, the drive signal output from the control unit 13 is used as a trigger, and the alternating current is generated by the oscillation circuit 105. Therefore, the secondary side coil 103b of the transformer 103 can be generated by appropriately setting the oscillation frequency and amplitude in the oscillation circuit 105, the number of coils of the primary side coil 103a and the secondary side coils 103b and 103c of the transformer 103, and the like. , 103c required power. Therefore, even when the gate portion of the main switching element 11a of the main opening/closing portion 11 is a current type main switching element requiring a constant value or a current value of a fixed value or more, it can be stably driven. Further, the driving power of the oscillation circuit 105 is of course supplied from any of the power supply units of the load control device. Alternatively, although not shown, the oscillation circuit 105 may be omitted, and a pulse signal having a predetermined frequency and a predetermined amplitude may be directly output from the control unit 13.

(Modification)

Next, a load control device 1B according to a modification of the first embodiment of the present invention will be described with reference to Fig. 19 . In the load control device of the above-described embodiment, when a drive signal is applied to the main switching element 11a of the main opening and closing portion 11, since the circuit is configured such that the current does not flow by the diode of the rectifying portion 12, only the main The gate portion (gate terminal) of the switching element 11a does not need to correspond to a voltage type main switching element having a fixed value or a current value of a fixed value or more. In the present modification, even when the main switching element 11a of the main opening/closing unit 11 is a current type main switching element requiring a current value of a fixed value or a fixed value or more, it can be stably driven.

As shown in FIG. 19, in the load control device 1B of the present modification, the synchronous switching elements 120a and 120b are connected between the alternating current line of the rectifying unit 12 and the minus side output of the rectifying unit serving as the circuit reference. The action of closing the main opening and closing portion 11 is performed synchronously to synchronize the switching elements 120a, 120b. The action of turning on. When the synchronous switching elements 120a and 120b are closed in synchronization with the operation of closing the main opening/closing unit 11, a gate for causing a current from the first power supply unit 14 in the load control device 1B toward the main switching element 11a of the main opening/closing unit 11 is formed. The path of the flow. Therefore, even if the gate portion of the main switching element 11a is a double gate element requiring current, it can be stably driven. Further, other configurations or basic operations are the same as those in the above-described embodiment, and the configuration of the drive circuit 10 is not particularly limited, and the above-described embodiment or modifications can be applied.

Next, a load control device 1C according to another modification of the first embodiment of the present invention will be described with reference to FIG. 20 and FIG. FIG. 20 is a circuit diagram showing a basic configuration of a load control device 1C according to another modification, and FIG. 21 is a timing chart showing signal waveforms of respective portions of the load control device 1C. In addition to the basic configuration of the load control device 1 shown in FIG. 3, the load control device 1C according to another modification further includes a voltage provided in the third power supply unit 16 that functions in a state where power is supplied to the load. A zero-crossing detecting unit (abbreviated as zero detection) 23 and a third pulse output unit (drive permission signal output unit) 24. Further, the specific configuration of the drive circuit 10 can be configured as any of the first to third embodiments.

When the voltage zero-crossing detecting unit 23 detects that the voltage has crossed zero, the third pulse output unit 24 outputs the third pulse signal (drive permission signal) for the third predetermined time. As shown in FIG. 21, the third predetermined time of the third pulse corresponds to a time shorter than a half cycle of the power supply cycle. The gate electrode input of the main switching element 11a of the main opening and closing unit 11 is driven only during the period in which both the first pulse (main opening/closing unit drive signal) and the third pulse (drive permission signal) are issued. The signal is activated to close the main opening and closing portion 11.

In the two-wire load control device, when the connected load is small, the charging time required for the capacitor 25 increases. At this time, in the operation shown in FIG. 4, when the main opening/closing unit 11 is driven based on the completion of charging, the driving signal of the main opening/closing unit 11 may be applied until the time of the current zero-crossing point is exceeded. When the main opening and closing portion 11 is opened and the auxiliary opening and closing portion 17 is closed in this state, the load current as the main current is supplied to the auxiliary opening and closing portion 17, and the stable operation of performing the primary charging in the half cycle of the commercial power source cannot be performed. .

However, as described in the fifth embodiment, the voltage zero-crossing can be combined with the charging completion signal and passed through a half cycle or a half cycle of the commercial power supply based on the voltage zero-crossing signal to prevent the main opening and closing portion from being driven. The method is controlled, and the operation of ensuring the power supply can be stably performed once in a half cycle of the commercial power source, regardless of the capacity of the load connected to the load control device 1C.

Next, a load control device 1D according to still another modification of the first embodiment of the present invention will be described with reference to Figs. 22 to 24 . Fig. 22 is a circuit diagram showing a configuration of a load control device 1D according to still another modification, Fig. 23 is an enlarged view of the drive circuit 10 of Fig. 22, and Fig. 24 is a timing chart showing signal waveforms of respective portions of the load control device 1D. Figure.

In the load control device 1D according to the other modified example, the drive circuit 10 of the main opening/closing unit 11 is configured by a high-voltage diode 101a, 101b connected to the first power supply unit 14 of the load control device 1D. One end The capacitors 102a and 102b connected to the respective power lines and connected to the diodes 101a and 101b at the other end, and the connection points of the diodes 101a and 101b and the capacitors 102a and 102b and the main switching element 11a of the main opening and closing unit 11 are connected. A self-extinguishing driving switch element 105a, 105b such as a photo thyristor or a photo triac between the gate terminals.

When the charging completion detection is performed by the voltage detecting unit 18 provided in the third power supply unit 16, the operation is shifted to the main opening/closing unit 11. At this time, in order to turn on the drive switching elements 105a and 105b connected to the gate electrodes of the main switching elements 11a of the main opening and closing unit 11, the signals are input, but the driving switching elements 105a and 105b are thyristor or bidirectional triode structure. Therefore, the driving of the driving switching elements 105a and 105b is only required to be a trigger signal. Therefore, the drive power for driving the switching elements 105a and 105b can be reduced as compared with the drive power in the above embodiments. Moreover, in order to make the drive switching elements 105a and 105b non-conductive, the synchronous switching elements 120a and 120b provided in the rectifying unit 12 may be opened, and the driving electric power for opening and closing the main opening and closing unit 11 can be reduced. For the two-wire load control device, an important issue is how to stably ensure the power supply and load control on the one hand. Therefore, it is desirable that the load control device has less driving power for stable operation of the load. .

(Second embodiment)

A load control device according to a second embodiment of the present invention will be described. 25 is a circuit diagram showing a configuration of a load control device 1E according to the first embodiment, and FIGS. 26 to 28 are diagrams showing respective portions of the load control device 1E. A time map of the signal waveform.

The load control device 1E of the first embodiment shown in FIG. 25 is connected in series between the AC power supply 2 and the load 3, and is composed of a main opening/closing unit 11 that controls the supply of the power to the load 3, and the rectifying unit 12 The control unit 13 controls the entire load control device 1E; the first power supply unit 14 supplies a stable power supply to the control unit 13, and the second power supply unit 15 supplies the first power supply in a state where the supply of power to the load 3 is stopped. The power supply unit 14 supplies electric power to the first power supply unit 14 when the electric power is supplied to the load 3, and the auxiliary switching unit 17 receives a small current among the load currents. Further, the third power supply unit 16 is further provided with a voltage detecting unit 18 that detects a voltage input to the third power supply unit, and a zero-cross detecting unit 23 that detects a zero-crossing point of the load current. The main opening and closing portion 11 includes a switching element 11a of a transistor structure, and the auxiliary opening and closing portion 17 includes a switching element 17a of a thyristor structure. Further, the control unit 13 is provided with a main control unit 20 including a CPU or the like, a first pulse output unit 19, a third pulse output unit 24, and a second pulse output unit 21.

The first pulse output unit 19 receives the charge completion signal from the snubber capacitor 25 from the voltage detecting unit 18, and then outputs the first pulse so that the main opening/closing unit 11 is turned on only for the first predetermined time. In other words, the first pulse rises after receiving the charge completion signal from the voltage detecting unit 18, and falls after the first predetermined time elapses. After the zero-crossing detecting unit 23 detects the zero-crossing point of the load current, the third pulse output unit 21 outputs the third pulse so that the main opening/closing unit 11 is restricted to the open state in the third predetermined time. In other words, the third pulse rises after receiving the zero-cross detection signal from the zero-crossing detecting unit 23, and after the third predetermined time elapses drop. When the second pulse output unit 21 detects that the main opening/closing unit 11 is non-conductive (open state), it outputs a second pulse signal for a predetermined period of time, so that the auxiliary opening and closing unit 17 is turned on only for the second predetermined time. In other words, the second pulse rises after detecting that the main opening/closing unit 11 is non-conductive (open state), and then falls after the second predetermined time elapses.

In other words, in a state where the load control device 1E is not turned off without supplying power to the load 3, the current also flows from the power source 2 to the second power supply unit 15 via the rectifying unit 12, so that a small current flows in the load 3, but the current flows. It is suppressed to a low level so that the load 3 does not malfunction, and the impedance of the second power supply unit 15 is maintained at a high value.

When power is supplied to the load 3, the impedance of the third power supply unit 16 is lowered, and the current flows to the circuit side inside the load control device 1E, thereby charging the snubber capacitor 29 of the first power supply unit 14. As described above, the third power supply unit 16 is provided with a voltage detecting unit (charge monitoring unit) 18 for detecting the voltage input to the third power supply unit 16. When the voltage detecting unit 18 detects that the voltage input to the third power supply unit 16 has reached a predetermined threshold value, the voltage detecting unit 18 outputs a predetermined detection signal to the control unit 13. When the control unit 13 receives the detection signal from the voltage detecting unit 18, the main opening/closing unit 11 is turned on (in a closed state) for the first predetermined time. In the configuration example of the control unit 13, a first pulse output unit 19 that is hard-formed using a dedicated IC or the like is provided as a part of the control unit 13 so as to be directly outputted based on the detection signal from the voltage detecting unit 18. 1 pulse signal. Alternatively, the configuration is not limited to the configuration shown in the drawings, and the output from the voltage detecting unit 18 may be input to a main control unit including a CPU or the like. 20, and the first pulse signal is output in a soft manner. The first predetermined time for turning on the main opening/closing unit 11 is preferably set to be slightly shorter than a half cycle of the commercial frequency power supply.

When the first opening and closing unit 11 is turned off (open state) after the first predetermined time period has elapsed, the control unit 13 causes the auxiliary opening and closing unit 17 to be only for the second predetermined time (for example, several hundred microseconds). Internal conduction (becomes closed). In this operation, the auxiliary opening and closing unit 17 may be made non-conductive (open state) slightly later than the main opening/closing unit 11. Further, the main control unit 20 may output the pulse signal having only the second predetermined time longer than the first pulse signal outputted from the main opening/closing unit to the auxiliary opening and closing unit 17. Alternatively, a diode or a capacitor may be used to form the delay circuit.

By the above operation, after the snubber capacitor 25 is completely charged, the main opening/closing unit 11 supplies electric power to the load 3 for most of the half cycle of the commercial power source, and thereafter, after the energization current is reduced, the self-assist opening/closing unit 17 Power is supplied to the load 3. Further, the auxiliary opening and closing portion 17 includes the switching element 17a of the thyristor structure, and therefore becomes non-conductive (open state) at a time point (zero-crossing point) at which the current value is zero. When the auxiliary opening and closing unit 17 is rendered non-conductive (open state), the current flows again to the third power supply unit 16, so that the above operation is repeated every half cycle of the commercial power supply.

Fig. 26 shows signal waveforms of respective portions of the load control device 1E at the time of high load, and Figs. 27 and 28 show signal waveforms of respective portions of the load control device 1E at the time of low load. In addition, FIG. 27 shows a case where the main opening/closing unit 11 is controlled using only the first pulse, and FIG. 28 shows a case where the main opening/closing unit 11 is controlled by using the first pulse and the third pulse.

When the load 3 connected at a high load is a high capacity, as shown in FIG. 26, the snubber capacitor 25 is charged in a short time, after the completion of the charging, for most of the half cycle of the commercial power source, The main opening and closing unit 11 supplies electric power to the load 3. At this time, the first predetermined time is set so that the main opening/closing portion 11 is non-conductive before the current point (zero-crossing point) at which the current value is zero. Therefore, the main opening/closing portion 11 does not exceed the zero-crossing point to be in an on state.

However, when the load 3 connected at a low load is a low capacity, the load current is small, so charging takes more time. Therefore, as shown in FIG. 27, the time until the zero-crossing detection unit 23 detects the zero-crossing period until the voltage detecting unit 18 detects that the charging is completed becomes long, and the rise of the first pulse is delayed. Since the first predetermined time is set in accordance with the case of the above-described high load, if the rise of the first pulse is excessively delayed, the first pulse falls after the load current exceeds the zero-crossing point. Therefore, when the main opening/closing unit 11 is controlled using only the first pulse, the main opening/closing unit 11 is turned on beyond the zero-crossing point at a low load, and the charging operation is unstable every half cycle.

Therefore, in the present embodiment, the third pulse outputted from the third pulse output unit 24 is used to restrict the main opening and closing unit 11 to the open state for the third predetermined time. The third pulse rises after receiving the signal that the zero-crossing detecting unit 23 detects the zero-crossing, and falls after the third predetermined time elapses. The third predetermined time is set to be shorter than a half cycle of the load current.

The first pulse output from the first pulse output unit 19 and the third pulse output from the third pulse output unit 24 are input to the control unit 13. The control unit 13 includes an AND circuit 25a, and acquires a logical product of the first pulse and the third pulse, and outputs the result to the main opening/closing unit 11. Thereby, the main opening and closing portion 11 is only the first The first predetermined time during which the pulse rises is closed within a time period that overlaps with the third predetermined time during which the third pulse rises. As described above, the third pulse rises at the time when the zero-crossing detecting unit 23 detects the zero-crossing point, and falls in the third predetermined time that is shorter than the half-cycle of the load current. Therefore, even if the snubber capacitor 29 is detected When the charging is completed, that is, after the time point at the start of the first predetermined time, a deviation occurs, and the main opening/closing unit 11 does not exceed the zero-crossing point of the power supply frequency to be in a closed state. Thereby, it is indeed possible to charge every half cycle, thereby making the action stable. These operations are performed on the load current. Therefore, even if the main opening and closing portion 11 is constituted by the switching element 11a having a transistor structure, the power factor of the load 3 is not limited to 1, so that it is suitable for the fluorescent lamp and In the two-wire type load control device of any of the incandescent lamps, since the main opening/closing portion is a switching element composed of a double-gate type transistor, the load control device can be realized in a small size and a large capacity.

According to the load control device 1E of the second embodiment, when the voltage detecting unit 18 detects that the voltage input to the third power supply unit 16 has reached a predetermined threshold value, the control unit 13 causes the main opening/closing unit 11 to be in the first predetermined time. Since the inside is turned on (becomes in a closed state), the main opening/closing unit 11 supplies electric power to the load for most of the half cycle of the commercial power source. In addition, even if the third predetermined time elapses during the first predetermined time period, the control unit 13 also turns the main opening and closing unit 11 into a non-conducting state (turning on the open state). Therefore, for example, the first predetermined time is, for example, at a low load. At the beginning of the time point delay, the main opening and closing portion 11 also becomes non-conductive before the load current is zero. Thereby, the main opening and closing unit 11 is turned on without exceeding the zero crossing of the load current, so that the charging can be surely performed during the half cycle of the AC power supply.

Further, when the main opening/closing unit 11 is turned off after the first predetermined time elapses, the auxiliary opening and closing unit 17 is turned on only for the second predetermined time, and therefore the main part is half of the commercial power source for a long period of time. After the opening and closing unit supplies electric power to the load, the energization current is reduced, and thereafter, the auxiliary opening and closing unit 17 supplies electric power to the load. These operations are performed on the load current. Therefore, even if the main opening and closing portion 11 is constituted by the switching element 11a having a transistor structure, the power factor of the load is not limited to 1, so that it is suitable for the fluorescent lamp and the incandescent lamp. A two-wire load control device of any of the lamps. Further, since the level of noise generated when the load control device performs the operation is suppressed to be low, it is possible to realize a load control device having a wide range of applicable loads and a wide range of loads.

(Third embodiment)

A load control device according to a third embodiment of the present invention will be described. FIG. 29 is a circuit diagram showing a configuration of a load control device 1F according to the second embodiment. The load control device 1F is different from the load control device 1E of the second embodiment in that it further includes a current detecting unit 22 for detecting a current flowing through the auxiliary opening and closing unit 17, and an output from the current detecting unit 22. The OR circuit 25b that performs an operation such as a signal is otherwise the same. The OR circuit 25b is provided in the subsequent stage of the AND circuit 25a of the control unit 13.

It is desirable that the auxiliary opening and closing unit 17 is for detecting the zero-crossing point of the original current, and does not have the main purpose of energization, and is constituted by a small switching element. However, if the frequency drifts in the commercial power supply, or the load control device can perform operations at 50 Hz and 60 Hz, then the autonomy The opening and closing portion is increased in time from the non-conduction to the zero-crossing point of the current, and the energization of the auxiliary opening and closing portion is started before the load current is sufficiently reduced. Further, when the load is too large, there is a case where the energization loss is increased even if the energization time of the auxiliary opening and closing portion is the same, and the switching element constituting the auxiliary opening and closing portion 17 is broken. Therefore, in the third embodiment, the current detecting unit 22 detects the current value flowing through the auxiliary opening and closing unit 17, and when the current exceeding the current value allowed by the auxiliary opening and closing unit 17 flows, the main opening/closing unit 11 is again turned on. It is turned on only in a short time (fourth predetermined time) (becomes in a closed state), and thereafter, when the main opening/closing portion 11 is turned off (open state), the auxiliary opening and closing portion 17 is again turned on.

More specifically, when the current detecting unit 22 detects that a current exceeding the current value allowed by the auxiliary opening and closing unit 17 flows, a signal indicating this is output to the OR circuit 25b of the control unit 13. When the OR circuit 25b receives any one of the output signal from the AND circuit 25a or the output signal from the current detecting unit 22, the main opening/closing unit 11 is turned on only for a short time, thereby protecting the auxiliary opening and closing unit 17. By repeatedly switching the main opening and closing portion 11 and the auxiliary opening and closing portion 17 in this manner, the switching element of the auxiliary opening and closing portion 17 is prevented from being damaged, and the correspondence with the type of the commercial power source is improved or the correspondence with the overload is improved.

According to the load control device 1F of the third embodiment, when the current detecting unit 22 detects that a current exceeding the allowable value flows in the auxiliary opening and closing unit 17, the main opening/closing unit is temporarily turned on (closed state), and thereafter, Become non-conducting. Thereby, the switching element of the auxiliary opening and closing unit 17 is prevented from being damaged, and the auxiliary switching unit 17 can be configured by a small switching element to make the load The control device is miniaturized, thereby improving the correspondence with the type of the commercial power source or improving the correspondence with the overload.

In addition, the present invention is not limited to the configuration of the above-described embodiment, and at least the control unit 13 receives the first pulse output from the first pulse output unit based on the self-voltage detecting unit 18 receiving the charging completion signal of the snubber capacitor 25. The operation of the main opening and closing unit 11 is controlled by receiving the detection signal of the zero-crossing point of the load current from the zero-crossing detecting unit 23 and the logical product of the third pulse outputted by the third pulse output unit. Further, the present invention can be variously modified. For example, the third pulse causes the output from the zero-crossing detecting unit 23 to be input to the main control unit 20 including a CPU or the like, and the first pulse signal is output in a soft manner.

(Fourth embodiment)

Next, a load control device 1G according to a fourth embodiment of the present invention will be described with reference to Fig. 30. The basic configuration of the load control device 1G may be configured by any of the above embodiments and modifications.

The load control device 1G of the fourth embodiment is used to control a plurality of lighting fixtures in a non-residential house such as an office building or a commercial facility, for example, a control panel provided at a place away from the lighting device (control) A plurality of boards are provided. Further, a remote control signal 27 such as an operation switch (not shown) provided at a place away from the control board is received to control the ON/OFF of the load control device 1G. Therefore, the main control unit 20 is connected to the operation switch via the wiring, and when the main control unit 20 recognizes the address of its own overlap with the remote control signal 27, the master control The system 20 outputs a control signal.

Fig. 31 shows a configuration of a modification of the load control device 1G of the fourth embodiment. In the modification, the main control unit 20 is further connected to the fourth power supply unit 26 including the rectifier circuit, and rectifies the electric power obtained from the remote control signal 27 to secure the main control unit 20 (or the control unit 13). power supply. As described above, in the two-wire type load control device, even when the load control device is turned off, the second power supply unit 15 is provided to ensure the power supply of the main control unit 20, so that a weak current always flows in the load 3. . However, as described in this modification, since the power supply of the main control unit 20 is separately ensured, the second power supply unit 15 is not required. Therefore, in the state where the load control device 1G is turned off, no current flows in the load 3 at all. Thereby, deterioration and malfunction of the load 3 can be prevented.

(Fifth Embodiment)

A load control device according to a fifth embodiment of the present invention will be described. Fig. 32 shows a load control system (system) 30 using the load control device according to the first embodiment of the present invention. The load control system 30 is composed of a plurality of load control devices 1 and a parent control unit 31 that remotely controls the load control devices 1. The number of load control devices 1 connected to the parent control unit 31 can be appropriately set. Each of the load control device 1 and the parent control unit 31 is wired, but may be connected wirelessly. Each of the load control devices 1 receives the control signal transmitted from the parent control unit 31, and controls the connected load 3 based on the signal. The parent control unit 31 transmits a control signal to the main control unit 20 of each load control device 1. An address signal corresponding to any of the load control devices 1 is added to the control signal transmitted from the parent control unit 31. Load control When the device 1 receives the control signal transmitted by attaching the address signal given to itself, the device 1 performs an operation based on the control signal to control the load 3. In FIG. 32, the load control device 1 connected to the parent control unit 31 is not limited to the load control device 1H of the first embodiment, and may be the load control device 1I to the fifth embodiment of the second embodiment described below. The load control device 1L of the example. Further, the load control devices 1H to 1L may be combined as appropriate to be connected to the parent control unit 31.

(First embodiment)

FIG. 33 is a circuit diagram showing a configuration of the load control device 1H according to the first embodiment of the load control device 1 used in the fifth embodiment, and FIGS. 34A and 34B are signal waveforms showing respective portions of the load control device 1H. The load control device 1H of the first embodiment shown in FIG. 33 is connected in series between the AC power supply 2 and the load 3, and is composed of a main opening/closing unit 11 that controls the supply of the power to the load 3, and the rectifying unit 12 The control unit 13 controls the entire load control device 1H; the first power supply unit 14 supplies a stable power supply to the control unit 13, and the third power supply unit 16 supplies electric power to the first power supply unit 14 when power is supplied to the load 3; The independent power supply unit 26 supplies electric power to the first power supply unit 14 while the power supply to the load 3 is stopped. The receiving unit 16a receives the control signal transmitted from the parent control unit 31, and the auxiliary opening and closing unit 17 receives the load. A small current in the current. Further, the third power supply unit 16 is further provided with a voltage detecting unit 18 that detects the voltage input to the third power supply unit 16. The main opening and closing portion 11 includes a switching element 11a of a transistor structure, and the auxiliary opening and closing portion 17 includes a switching element 17a of a thyristor structure.

The self-master control unit 31 often sends a control signal (pulse signal) for remotely controlling any of the load control devices 1H. The receiving unit 16a of the load control device 1H receives this control signal and transmits it to the main control unit 20. The control signal received by the receiving unit 16a is also transmitted to the independent power supply unit 26. The independent power supply unit 26 rectifies the pulse current constituting the control signal, and supplies electric power to the first power supply unit 14 (that is, the main control unit 20). Since the control signal is always sent from the parent control unit 31 regardless of the operation of the load 3, the electric power is supplied to the first power supply unit 14 from the independent power supply unit 26 even when power is not supplied to the load 3. In other words, the independent power supply unit 26 supplies electric power to the first power supply unit 14 independently of the AC power supply 2 connected in series to the load 3.

On the other hand, when electric power is supplied to the load 3, the impedance of the third power supply unit 16 is lowered, and the current flows to the circuit side inside the load control device 1E, thereby charging the snubber capacitor 25 of the first power supply unit 14. As described above, the third power supply unit 16 is provided with a voltage detecting unit (charge monitoring unit) 18 for detecting the voltage input to the third power supply unit 16. When the voltage detecting unit 18 detects that the voltage input to the third power supply unit 16 has reached a predetermined threshold value, the voltage detecting unit 18 outputs a predetermined detection signal. When the control unit 13 receives the detection signal from the voltage detecting unit 18, the main opening/closing unit 11 is turned on (in a closed state) for the first predetermined time. In the configuration of the control unit 13, a first pulse output unit 19 that is hard-formed using a dedicated IC or the like is provided as a part of the control unit 13 so as to be directly output based on the detection signal from the voltage detecting unit 18. The first pulse signal. Alternatively, the configuration is not limited to the configuration shown in the drawings, and the output from the voltage detecting unit 18 may be input to the main control unit 20 including a CPU or the like, and The first pulse signal is output in a soft manner. The first predetermined time for turning on the main opening/closing unit 11 is preferably set to be slightly shorter than a half cycle of the commercial frequency power supply.

When the first opening and closing unit 11 is turned off (open state) after the first predetermined time period has elapsed, the control unit 13 causes the auxiliary opening and closing unit 17 to be only for the second predetermined time (for example, several hundred microseconds). Internal conduction (becomes closed). In this operation, the auxiliary opening and closing unit 17 may be turned off (open state) slightly later than the main opening/closing unit 11. FIG. 33 shows an example in which a second pulse for outputting a predetermined time is provided as a part of the control unit 13. The second pulse output unit 21 of the signal causes the auxiliary opening and closing unit 17 to be turned on only for the second predetermined time after detecting that the main opening/closing unit 11 is rendered non-conductive (open state). Further, the main control unit 20 may output the pulse signal of the second predetermined time longer than the first pulse signal outputted from the main opening/closing unit 11 to the auxiliary opening and closing unit 17. Alternatively, a diode or a capacitor may be used to form the delay circuit.

In the load control device of the present embodiment, the timing of the signal waveform of the main portion is the same as that of FIG. 4, and therefore the description thereof will be omitted. Further, a waveform in the case where the power factor is 1 is shown in FIG. 34A, and a waveform in the case where the power factor is not 1 is shown in FIG. 34B.

(Second embodiment)

Next, a second embodiment of the load control device used in the fifth embodiment of the present invention will be described. 35 is a circuit diagram showing a configuration of a load control device 1I of the second embodiment. 33, compared with FIG. 35, the load control device 1I of the second embodiment and the load of the first embodiment can be seen. The control device 1H is different in that it further includes a current detecting portion 22 for detecting a current flowing through the auxiliary opening and closing portion 17. The other aspects are the same.

As described in the previous example shown in FIG. 16, it is desirable that the auxiliary opening and closing unit is for detecting the zero-crossing point of the original current, and does not have the main purpose of energization, and is constituted by a small switching element. However, if the frequency shifts in the commercial power supply or the load control device can operate at 50 Hz and 60 Hz, the time until the self-opening and closing portion becomes non-conducting until the zero-crossing point of the current increases, and the load current changes. Start energizing the auxiliary opening and closing unit before it is sufficiently small. Further, when the load is excessively large, there is a case where the energization loss is increased even if the energization time of the auxiliary opening and closing portion is the same, and the switching element constituting the auxiliary opening and closing portion is broken. Therefore, in the second embodiment, the current detecting unit 22 detects the current value flowing through the auxiliary opening and closing unit 17, and when the current exceeding the current value allowed by the auxiliary opening and closing unit 17 flows, the main opening/closing unit 11 is again turned on. It is turned on only in a short time (closed state), and thereafter, when the main opening/closing portion 11 is rendered non-conductive (open state), the auxiliary opening and closing portion 17 is again turned on. By repeatedly switching the main opening and closing portion 11 and the auxiliary opening and closing portion 17 in this manner, the switching elements of the auxiliary opening and closing portion 17 are prevented from being damaged, and the correspondence with the type of the commercial power source is improved or the correspondence with the overload is improved. Fig. 36 shows waveforms when the load control device 1I of the second embodiment performs an operation.

(Third embodiment)

Next, a third embodiment of the load control device used in the fifth embodiment of the present invention will be described. Figure 37 is a diagram showing the negative of the third embodiment. A circuit diagram of the configuration of the load control device 1J. The load control device 1J of the third embodiment is basically the same as the load control devices 1H and 1I of the first and second embodiments described above, except that the switching element 11b constituting the main opening and closing portion 11 is different from that of Fig. 35. It is composed of a horizontally mounted transistor element that can be controlled bidirectionally. In addition, FIG. 37 is a standard of the load control device 1I of the second embodiment shown in FIG. 35. However, the present invention is not limited thereto, and may be the same as the load control device 1H of the first embodiment shown in FIG. Ground composition.

Fig. 38 shows a schematic configuration of a transversely mounted transistor element which can be controlled bidirectionally. Such a transverse transistor element is called a High Electron Mobility Transistor (HEMT), and uses a two-dimensional electron gas layer generated on an AlGaN/GaN hetero interface as a channel. a (channel) layer, wherein an electrode D1 and an electrode D2 and a control electrode (gate) G are formed on the surface of the substrate, and the electrodes D1 and D2 are respectively connected in series to the power source 2 and the load 3, and the control electrode (gate) The electrode G1 controls the electrode D1 and the electrode D2 to maintain a high withstand voltage when the electrode D1 and the electrode D2 are turned off. As the control electrode G, for example, a Schottky electrode can be used.

When the main opening/closing unit 11 is non-conductive (open state), the control unit 13 applies a low level signal to the control electrode G. However, the potential of the control electrode G is lower than the lowest potential of the main opening and closing unit 11 only. One diode is raised above the rectifying portion 12. Here, as long as it is sufficiently higher than the potential of one of the above-described diodes, the threshold value for switching between the on (closed state) and the non-conductive (open state) of the main opening and closing portion 11 can be surely maintained non-conductive (opening) state). On the other hand, when the main opening/closing unit 11 is in an ON state (closed state), the same operation as in the case of the first to third embodiments described above is performed. Therefore, the high voltage commercial power source can be directly controlled by the control unit 13 driven by a control signal of several V. Further, by using the HEMT having a high degree of electronic mobility, the two-wire type load control device 1J can be realized in a small size and a high capacity.

(Fourth embodiment)

Next, a fourth embodiment of the load control device used in the fifth embodiment of the present invention will be described. Fig. 39 is a circuit diagram showing a configuration of a load control device 1K of the fourth embodiment. The load control device 1K of the fourth embodiment is basically the same as the load control devices 1H to 1J of the first to third embodiments described above, but differs in that the switching element 11a constituting the main opening and closing portion 11 is bidirectionally controllable. A novel transversely mounted transistor element is constructed. 39 is a standard of the load control device 1J of the third embodiment shown in FIG. 37. However, the present invention is not limited thereto, and may be the load control device 1H of the first embodiment shown in FIG. The load control device 1I of the second embodiment shown in Fig. 35 is configured in the same manner.

40 is a plan view showing a configuration of a switching element 11a, and FIG. 41 is a cross-sectional view taken along line A-A of FIG. As shown in FIG. 41, the substrate 120 of the switching element 11a is composed of a conductor layer 120a, a GaN layer 120b laminated on the conductor layer 120a, and an AlGaN layer 120c. In the switching element 11a, a two-dimensional electron gas layer generated on an AlGaN/GaN hetero interface is used as a channel layer. As shown in FIG. 40, the first electrode D1 and the second electrode which are respectively connected in series to the power source 2 and the load 3 are formed on the surface 120d of the substrate 120. The electrode D2 and the intermediate potential portion S having an intermediate potential with respect to the potential of the first electrode D1 and the potential of the second electrode D2. Further, a control electrode (gate) G is formed on the intermediate potential portion S. As the control electrode G, for example, a Schottky electrode is used. The first electrode D1 and the second electrode D2 are comb-tooth shapes including a plurality of electrode portions 111, 112, 113, ..., and 121, 122, 123, ... arranged in parallel with each other, and are arranged in a comb-like shape. The departments are opposite each other. The intermediate potential portion S and the control electrode G are disposed between the electrode portions 111, 112, 113, ... and 121, 122, 123, ... arranged in a comb shape, respectively, and have a plane with a space formed between the electrode portions. Shapes of similar shape (roughly fishback bones).

Next, a horizontally-structured transistor structure constituting the switching element 11a will be described. As shown in FIG. 40, the electrode portion 111 of the first electrode D1 and the electrode portion 121 of the second electrode D2 are arranged such that the center line in the width direction thereof is on the same line, the corresponding portion of the intermediate potential portion S, and the control electrode G. The corresponding portions are arranged in parallel with the arrangement of the electrode portions 111 of the first electrode D1 and the electrode portions 121 of the second electrode D2, respectively. The distance between the electrode portion 111 of the first electrode D1, the electrode portion 121 of the second electrode D2, the corresponding portion of the intermediate potential portion S, and the corresponding portion of the control electrode G in the width direction is set to a distance at which a predetermined withstand voltage can be maintained. . The direction orthogonal to the width direction, that is, the electrode portion 111 of the first electrode D1 and the electrode portion 121 of the second electrode D2 are also the same in the longitudinal direction. Moreover, these relationships are also the same for the other electrode portions 112 and 122, 113, and 123, . In other words, the intermediate potential portion S and the control electrode G are disposed at positions where the predetermined withstand voltage can be maintained with respect to the first electrode D1 and the second electrode D2.

In this way, the intermediate potential portion S having an intermediate potential with respect to the potential of the first electrode D1 and the potential of the second electrode D2, and the control electrode G connected to the intermediate potential portion S for controlling the intermediate potential portion S In the position where the predetermined withstand voltage can be maintained with respect to the first electrode D1 and the second electrode D2, for example, when the first electrode D1 is on the high potential side and the second electrode D2 is on the low potential side, the bidirectional switching element is used. When 11a is turned off, that is, when a signal of 0 V is applied to the control electrode G, the current is surely cut off at least between the first electrode D1, the control electrode G, and the intermediate potential portion S (current is applied to the control electrode (gate) ) G is blocked directly below). On the other hand, when the bidirectional switching element 11a is turned on, that is, when a signal having a predetermined threshold or a predetermined threshold or more is applied to the control electrode G, as indicated by an arrow in FIG. A current flows through the path of the first electrode D1 (electrode portions 111, 112, 113, ...), the intermediate potential portion S, and the second electrode D2 (electrode portions 121, 122, 123, ...). The opposite is true in the opposite case.

By forming the intermediate potential portion S at a position where the predetermined withstand voltage can be maintained with respect to the first electrode D1 and the second electrode D2, the threshold voltage of the signal applied to the control electrode G is lowered to the minimum necessary. Until the limited level, the switching element 11a can be surely turned on/off, so that a low on-resistance can be achieved. Further, by using the novel switching element 11a, the main opening and closing portion 11 is configured, and the potential of the reference (GND) is made the same as the intermediate potential portion S based on the control signal, whereby the control driven by the control signal of several V can be utilized. Section 13, to directly control high voltage commercial power supplies. Moreover, compared with the case of the above-described third embodiment, the rectifying unit 12 is not affected. The influence of the voltage drop caused by the diode is reduced, so that even if the threshold voltage that turns on (closed state)/non-conducting (open state) of the main opening and closing portion 11 is lowered, the non-conduction (open state) can be surely maintained. ). Further, in the transverse transistor device using the two-dimensional electron gas layer generated on the hetero interface as the channel layer, the high potential of the threshold voltage for making the device non-conducting has an inverse relationship with the on resistance at the time of conduction. Therefore, if the threshold voltage can be lowered, the lower on-resistance can be maintained, and accordingly, the load control device can realize small size and high capacity.

(Sixth embodiment)

Next, a load control device according to a sixth embodiment of the present invention will be described. Fig. 42 is a circuit diagram showing a configuration of a load control device 1L according to the sixth embodiment. The load control device 1L according to the sixth embodiment is basically the same as the load control devices 1H to 1K of the fifth embodiment, but the third power supply unit 16 includes the zero-crossing detecting unit 23, and the control unit 13 The third pulse output unit 24 is included. In addition, FIG. 42 is a standard of the load control device 1I of the second embodiment shown in FIG. 35. However, the present invention is not limited thereto, and may be the same as the load control device 1H of the first embodiment shown in FIG. The load control device 1J of the third embodiment shown in Fig. 37 or the load control device 1K of the fourth embodiment shown in Fig. 39 is configured in the same manner.

The zero-crossing detecting unit 23 detects the zero-crossing point of the load current, and outputs a zero-crossing detection signal indicating this to the third pulse output unit 24. When the third pulse output unit 24 receives the input of the zero-cross detection signal from the zero-crossing detecting unit 23, the third pulse output unit 24 outputs the third pulse. The third pulse rises after receiving the zero-crossing detection signal from the zero-crossing detecting unit 23, and falls after the third predetermined time elapses. drop. The third predetermined time is set to be less than half a cycle of the load current.

The first pulse output from the first pulse output unit 19 and the third pulse output from the third pulse output unit 24 are input to the control unit 13. The control unit 13 includes an AND circuit 25a that acquires the logical product of the first pulse and the third pulse, and outputs it to the main opening and closing unit 11 via the OR circuit 25b. The OR circuit 25b is provided in the subsequent stage of the AND circuit 25a of the control unit 13. When receiving any one of the output signal from the AND circuit 25a or the output signal from the current detecting unit 22, the OR circuit 25b turns on the main opening/closing unit 11 only for a short time to protect the auxiliary opening and closing unit 17.

As described above, the main opening/closing unit 11 is closed only for the time between the first predetermined time in which the first pulse rises and the third predetermined time in which the third pulse rises. The third pulse rises at the time point after the zero-crossing detecting unit 23 detects the zero-crossing point, and falls at the third predetermined time which is shorter than the half-cycle of the load current. Therefore, even if the charging completion time of the snubber capacitor 25 is detected The point, that is, the deviation occurs after the time point from the start of the first predetermined time, and the main opening/closing unit 11 does not exceed the zero-crossing point of the power supply frequency to be in the closed state. Thereby, charging can be performed every half cycle, so that the action is stabilized.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

1, 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1I, 1J, 1K, 1L, 50, 60‧‧‧ load control device

2‧‧‧AC power supply

3‧‧‧load

10‧‧‧Drive circuit

11, 51, 61‧‧‧Main opening and closing department

11a, 51a, 61a‧‧‧ main switching components

11b, 11c‧‧‧ switching elements

12, 52, 62‧‧ ‧ Rectifier

13, 53, ‧ ‧ Control Department

14, 54, ‧ ‧ the first power supply unit

15, 55, 65‧‧‧2nd power supply department

16, 56, 66‧‧‧3rd power supply department

16a‧‧‧Receiving Department

17, 57‧‧‧Auxiliary opening and closing department

17a‧‧‧Auxiliary switching elements

18‧‧‧Voltage Detection Department

19‧‧‧1st pulse output

20‧‧‧Main Control Department

21‧‧‧2nd pulse output

22‧‧‧ Current Detection Department

23‧‧‧Voltage Zero Crossing Detection Department

24‧‧‧3rd pulse output unit (drive permission signal output unit)

25, 29, 54a‧‧‧ snubber capacitors

25a‧‧‧AND circuit

25b‧‧‧OR circuit

26‧‧‧4th power supply department

27‧‧‧Remote control signals

30‧‧‧Load Control System

31‧‧‧Female Control Department

56a‧‧‧Zina diode

58‧‧‧ coil

67‧‧‧ Zero-crossing detection department

101,102‧‧‧Light-insulating semiconductor switching elements

101a, 102a‧‧‧Lighting Department

101b, 102b‧‧‧Light Receiving Department

103‧‧‧Transformer (electromagnetic coupling element)

103a‧‧1 times side coil

103b, 103c‧‧‧2 secondary coil

104a, 104b‧‧‧Rectifier circuit

105‧‧‧Oscillation circuit

105a, 105b‧‧‧ drive switching elements

111, 112, 113, 121, 122, 123‧‧‧ electrode parts

120‧‧‧Substrate

120a‧‧‧ conductor layer

120b‧‧‧GaN layer

120c‧‧‧AlGaN layer

120d‧‧‧ surface

D1‧‧‧1st electrode

D2‧‧‧2nd electrode

G‧‧‧Control electrode (gate)

G1, G2‧‧‧ gate electrode

S‧‧‧Intermediate potential section

Figure 1A is a transverse double gate transistor junction with one withstand voltage A circuit diagram of a main switching element of the configuration, and FIG. 1B is a circuit diagram in a case where two MOSFET type transistor elements are connected in opposite directions.

2 is a longitudinal cross-sectional view of a main switching element of a horizontally-mounted double gate transistor structure.

3 is a circuit diagram showing a basic configuration of a load control device according to the first embodiment of the present invention.

Fig. 4 is a timing chart showing signal waveforms of respective portions of the load control device according to the first embodiment.

Fig. 5 is a circuit diagram showing a first embodiment of a drive circuit in the load control device according to the first embodiment of the present invention.

Fig. 6 is an enlarged view of the drive circuit of Fig. 5.

FIG. 7 is a circuit diagram showing a modification of the drive circuit of the first embodiment in the load control device.

Figure 8 is an enlarged view of the drive circuit of Figure 7.

FIG. 9 is a circuit diagram showing a second embodiment of the drive circuit in the load control device according to the first embodiment of the present invention.

Figure 10 is an enlarged view of the drive circuit of Figure 9.

FIG. 11 is a circuit diagram showing a specific configuration example of a drive circuit of a second embodiment of the load control device.

Fig. 12 is an enlarged view of the drive circuit of Fig. 11.

FIG. 13 is a circuit diagram showing a modification of the drive circuit of the second embodiment of the load control device.

Figure 14 is an enlarged view of the drive circuit of Figure 13.

Figure 15 is a diagram showing a drive circuit of a second embodiment of the load control device A circuit diagram of another variation.

Figure 16 is an enlarged view of the drive circuit of Figure 15.

Fig. 17 is a circuit diagram of a drive circuit of a third embodiment of the load control device.

Figure 18 is an enlarged view of the drive circuit of Figure 17.

Fig. 19 is a circuit diagram showing a modification of the load control device according to the first embodiment of the present invention.

Fig. 20 is a circuit diagram showing another modification of the load control device according to the first embodiment.

Fig. 21 is a timing chart showing signal waveforms of respective portions of the load control device of Fig. 20;

Fig. 22 is a circuit diagram showing still another modification of the load control device according to the first embodiment.

Figure 23 is an enlarged view of the drive circuit of Figure 22.

Fig. 24 is a timing chart showing signal waveforms of respective portions of the load control device of Fig. 22;

FIG. 25 is a circuit diagram showing a configuration of a load control device according to a second embodiment of the present invention.

Fig. 26 is a timing chart showing signal waveforms of respective portions of the load control device according to the second embodiment at a time of high load.

Fig. 27 is a timing chart showing signal waveforms of respective portions of the load control device according to the second embodiment at a time of low load.

FIG. 28 is a view showing a case where the load control device according to the second embodiment is used for the control of the main opening/closing unit when the third predetermined time is used at a low load. A time chart of the signal waveforms of each part.

Fig. 29 is a circuit diagram of a load control device according to a third embodiment of the present invention.

Fig. 30 is a circuit diagram of a load control device according to a fourth embodiment of the present invention.

Fig. 31 is a circuit diagram showing a modification of the load control device according to the fourth embodiment.

Fig. 32 is a block diagram showing a load control system using a load control device according to a fifth embodiment of the present invention.

FIG. 33 is a circuit diagram showing a configuration of a first embodiment of the load control device according to the fifth embodiment of the present invention.

34A and 34B are diagrams showing waveforms when the load control device according to the fifth embodiment performs an operation, FIG. 34A shows a waveform when the power factor is 1, and FIG. 34B shows a waveform when the power factor is not 1.

35 is a circuit diagram showing a configuration of a second embodiment of the load control device according to the fifth embodiment of the present invention.

Fig. 36 is a view showing waveforms when the load control device of Fig. 35 performs an operation;

37 is a circuit diagram showing a configuration of a third embodiment of the load control device according to the fifth embodiment of the present invention.

38 is a cross-sectional view showing a schematic configuration of a main switching element used in a main opening/closing unit of the load control device according to the third embodiment.

FIG. 39 is a circuit diagram showing a configuration of a fourth embodiment of the load control device according to the fifth embodiment of the present invention.

40 is a plan view showing a configuration of a switching element used in a main opening/closing unit of the load control device according to the fourth embodiment.

Figure 41 is a cross-sectional view taken along line A-A of Figure 40.

Fig. 42 is a circuit diagram showing a configuration of load control in the sixth embodiment of the present invention.

FIG. 43 is a timing chart showing signal waveforms of respective portions in the case where the load control device according to the sixth embodiment uses the third predetermined time for the control of the main opening/closing unit at the time of low load.

44 is a circuit diagram showing a configuration of a load control device according to a first prior art example.

45 is a circuit diagram showing a configuration of a load control device of a second prior art example.

1‧‧‧Load control device

2‧‧‧AC power supply

3‧‧‧load

10‧‧‧Drive circuit

11‧‧‧Main opening and closing department

11a‧‧‧Main switching elements

12‧‧‧Rectifier

13‧‧‧Control Department

14‧‧‧1st power supply department

15‧‧‧2nd power supply department

16‧‧‧3rd power supply department

17‧‧‧Auxiliary opening and closing department

18‧‧‧Voltage Detection Department

19‧‧‧1st pulse output

20‧‧‧Main Control Department

21‧‧‧2nd pulse output

22‧‧‧ Current Detection Department

25‧‧‧ snubber capacitor

Claims (22)

A load control device is a two-wire load control device connected in series between an AC power source and a load, and is characterized in that: a main opening and closing portion is connected in series to a power source and a load, and includes one control point for each connection point. a gate of a voltage, and comprising a main switching element of a transverse double-gate transistor structure having one withstand voltage portion for supplying a load control power source; an auxiliary opening and closing portion, comprising an auxiliary switching element of a thyristor structure, The main control unit controls the opening and closing of the main opening and closing unit and the auxiliary opening and closing unit when the main opening/closing unit is non-conducting, and the first power supply unit supplies electric power from the both ends of the main opening and closing unit via the rectifying unit. The second power supply unit supplies electric power from the both ends of the main opening and closing unit via the rectifying unit, and supplies power to the first power supply unit when the power supply to the load is stopped. a circuit that drives the main opening/closing unit; and a third power supply unit that electrically charges the load when the main opening/closing unit or the auxiliary opening/closing unit is in a closed state At the time of supply, the first power supply unit supplies power to the first power supply unit, and the voltage detection unit detects a voltage input to the third power supply unit, and the control unit controls the voltage to be supplied to the load. The detecting unit detects the electric power input to the third power supply unit When the pressure reaches a predetermined threshold value, the main opening/closing portion is turned on for a predetermined period of time, and when the main opening/closing portion is non-conductive, the auxiliary opening and closing portion is turned on for a second predetermined time. The load control device according to the first aspect of the invention, wherein the drive circuit is electrically connected to the control unit based on a potential of a point connected to the alternating current power source and the load, based on a drive signal from the control unit. The electrically insulated power is supplied to the gate portion of the main switching element to drive the main switching element. The load control device according to claim 2, wherein the drive circuit is composed of two light-insulating semiconductor switching elements including a light-emitting portion and a light-receiving portion, which are provided corresponding to the double gate of the main switching element, The light-emitting unit is connected to the control unit and inputs a drive signal, and the light-receiving unit performs photoelectric conversion when light emitted from the light-emitting unit is incident, and is connected in such a manner that the electric power generated by the light-receiving unit is respectively the alternating current A positive potential is applied to the gate terminal of the main switching element based on the power source and the point at which the load is connected. The load control device according to claim 1, wherein the drive circuit is provided by two diodes connected to the first power supply unit and one end connected to the double gate of the main switching element. a capacitor having a power line connected to the diode at the other end, and a drive switching element connected between a connection point of the diode and the capacitor and each gate terminal of the main switching element of the main opening and closing unit, according to The driving switch element is turned on by a signal from the control unit, thereby supplying driving power to the main opening and closing unit. The load control device according to claim 4, wherein the drive switching element in the drive circuit is turned on by a light-emitting portion that outputs light from the control unit based on a drive signal, and light that is received from the light-emitting portion. The light-insulating semiconductor switching element comprising the light-receiving portion is configured to supply the driving power to the main opening/closing portion by the electric power of the first power source by turning on the light-receiving portion. The load control device according to claim 3, wherein the light-emitting portions of the two light-insulating semiconductor switching elements of the driving circuit are connected in series. The load control device according to claim 2, wherein the drive circuit is connected via a rectifying circuit including a primary side coil connected to the control unit and a double gate corresponding to the main switching element. The transformer is configured as a transformer of two secondary coils of the gate electrode of the main switching element, and when an alternating current flows through the primary side coil based on a drive signal from the control unit, the pair of secondary coils are The electric power obtained by rectifying the electromotive force generated in the coil applies a positive electric potential to the gate terminal of the main switching element based on the point at which the alternating current power source and the load are connected. The load control device according to Item 4 or 5, wherein the drive circuit further includes a capacitor connected to a gate electrode of the main switching element and a connection point to which the drive switch element is connected, and Between the reference power lines of the above gate electrodes. The load control device according to claim 1, wherein the synchronous switching element is connected between a point at which the alternating current line of the rectifying portion is connected and a negative output point thereof, and is closed. The operation of the main opening and closing unit simultaneously closes the operation of the synchronous switching element. The load control device according to claim 9, wherein the drive switching element has a thyristor or a bidirectional triode structure, and the drive switching element is insulated by a signal insulated from any one of the load control devices. drive. The load control device according to the first or second aspect of the invention, wherein the third power supply unit includes a voltage detecting unit that detects that a voltage input to the third power supply unit has reached a predetermined threshold value, and And outputting a signal to the control unit; and the voltage zero-crossing detecting unit detects a zero-crossing of the voltage input to the third power supply unit, and outputs a signal to the control unit, wherein the control unit further includes a pulse signal output unit, if the voltage is from the voltage The detection unit input signal outputs a pulse signal for turning on the main opening/closing unit in the first predetermined time period, and the pulse signal output unit outputs the signal from the voltage zero-crossing detecting unit only in the third predetermined time. The pulse signal outputs a drive signal to close the main opening and closing unit only during the period in which both the signal from the voltage detecting unit and the signal from the voltage zero-cross detecting unit are emitted. The load control device according to claim 1 or 2, wherein the control unit operates according to a remote control signal. The load control device according to claim 12, further comprising: a fourth power supply unit connected to the first power supply unit and rectifying the remote control signal; and transmitting the remote control signal The control signal is supplied to the first power supply unit via the fourth power supply unit to activate the control unit, and the control unit causes the control unit to recognize the address of the remote control signal included in the control unit. The third power supply unit operates to drive the main opening/closing unit to supply electric power to the load. A load control device, comprising: a main opening and closing portion, comprising a switching element of a transistor structure, supplying a load control power source; and an auxiliary opening and closing portion, comprising a switching element of a thyristor structure, when the main opening and closing portion is non-conducting, The control unit controls the opening and closing of the main opening and closing unit and the auxiliary opening and closing unit, and the first power supply unit supplies electric power from both ends of the main opening and closing unit via the rectifying unit, and supplies the control unit with stable power. The second power supply unit supplies electric power from both ends of the main opening/closing unit via the rectifying unit, and supplies the electric power to the first power supply unit when the supply of electric power to the load is stopped. The third power supply unit supplies power to the first power supply unit when the main power supply unit supplies the power to the load when the main open/close unit or the auxiliary open/close unit is in a closed state, and the third power supply unit includes the input voltage. a voltage detecting unit that performs detection and a zero-cross detecting unit that detects a zero-crossing point of the load current, and the control unit causes the above-mentioned time to repeat the first predetermined time and the third predetermined time when the power is supplied to the load The main opening/closing unit is turned on, and the first predetermined time period is when the voltage detecting unit detects that the voltage input to the third power source unit has reached a predetermined threshold value, and the third predetermined time is in the zero-cross detecting unit. After the zero crossing of the load current is detected, the counting starts and is less than half a cycle of the load current. The load control device according to claim 14, wherein the control unit turns on the auxiliary opening and closing unit for a second predetermined time when the main opening/closing unit is non-conductive. The load control device according to claim 15, further comprising a current detecting unit that detects a current flowing through the auxiliary opening and closing unit; wherein the control unit performs control such that a predetermined threshold or regulation When the current above the threshold value flows in the auxiliary opening and closing portion, the main opening and closing portion is temporarily turned on, and then the main opening and closing portion is non-conductive. At this time, the auxiliary opening and closing portion is turned on. A load control device, comprising: a main opening and closing portion, comprising a switching element of a transistor structure, supplying a load control power source; and an auxiliary opening and closing portion, comprising a switching element of a thyristor structure, when the main opening and closing portion is non-conducting, The control unit controls the opening and closing of the main opening and closing unit and the auxiliary opening and closing unit, and the first power supply unit supplies electric power from both ends of the main opening and closing unit via the rectifying unit, and supplies the control unit with stable power. The third power supply unit supplies power to the first power supply unit when power is supplied to the load when the main opening/closing unit or the auxiliary opening/closing unit is in a closed state, and the receiving unit receives a control signal transmitted from the outside. And an independent power supply unit that rectifies the control signal received by the receiving unit to supply electric power to the first power supply unit. The load control device according to claim 17, further comprising a voltage detecting unit that detects a voltage input to the third power supply unit, wherein the control unit performs control such that when power is supplied to the load, When the voltage detecting unit detects that the voltage input to the third power supply unit has reached a predetermined threshold value, the main opening/closing unit is turned on for the first predetermined time period, and when the main opening/closing unit is not turned on, Auxiliary opening The closed portion is turned on within the second predetermined time. The load control device according to claim 18, further comprising a current detecting unit that detects a current flowing through the auxiliary opening and closing unit; wherein the control unit performs control such that a predetermined threshold or regulation When the current exceeding the threshold value flows through the auxiliary opening and closing portion, the main opening and closing portion is temporarily turned on, and then when the main opening and closing portion is not turned on, the auxiliary opening and closing portion is turned on. The load control device according to any one of claims 17 to 19, wherein the switching element of the main opening and closing portion is constituted by a bidirectionally controllable transverse transistor element; the horizontally mounted transistor element comprises : two electrodes connected to the power source and the load, and control electrodes disposed in the intermediate potential portion of the two electrodes. The load control device according to any one of claims 17 to 19, wherein the switching element of the main opening and closing portion has a transversely-shaped transistor structure, and includes: a first electrode and a second electrode, respectively Connected to the AC power source and the load in series, and formed on the surface of the substrate; at least a part of the intermediate potential portion is formed on the surface of the substrate, and becomes an intermediate potential with respect to the potential of the first electrode and the potential of the second electrode And a control electrode, at least a portion of which is connected to the intermediate potential portion, and The intermediate potential portion is controlled, and the intermediate potential portion and the control electrode are disposed at positions where a predetermined withstand voltage can be maintained with respect to the first electrode and the second electrode. The load control device according to claim 18, further comprising a zero-crossing detecting unit that detects a zero-crossing point of the load current, wherein the control unit only repeats the first predetermined time and the third predetermined time The main opening/closing unit is turned on, and the third predetermined time period is a half cycle after the zero-cross detecting unit detects the zero-crossing point of the load current and starts counting, and is smaller than the load current.