JP3346230B2 - 2-wire wiring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-wire wiring device.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a load switching device with a human body detecting function, FIG. 5 is a block diagram showing an infrared sensor section of the load switching device with a human body detecting function, and FIG. It is a block diagram showing an example.

Conventionally, as shown in FIG. 4, when a person approaches, the load switch 53 is automatically turned on to supply the commercial power supply 1 to the lighting fixture 2 corresponding to the load, thereby turning on the light. A load switchgear 50 with a human body detection function used for automatic lighting control of lighting fixtures, in which the load switchgear 53 is automatically turned off when moving away from the lighting fixture 2 so as to cut off the supply of the commercial power supply 1 and turn off the lighting fixture 2. is there. The load switching device 50 with a human body detection function includes a power supply unit 51 and an operation unit 5.
2 and a load switching unit 53. The operation unit 52 is a part that drives and operates the load switching unit 53.
a, an infrared sensor section 52b, and a daylight sensor section 52c.

The power supply 51 is supplied with power from the commercial power supply 1 and always supplies power to the operation unit 52 (ie, the opening / closing control unit 52a, the infrared sensor unit 52b, and the daylight sensor unit 52c). The operation unit 52 (that is, the opening / closing control unit 52
a, infrared sensor section 52b and daylight sensor section 52c)
Operate constantly receiving power supply from the power supply unit 51.

[0005] The infrared sensor 52 b
Is always receiving power supply and operates in a predetermined sensing area.
(Not shown) of the human body passing through this sensing area
Open / close control unit 5 that detects a radiated infrared ray and outputs a human body detection signal
2a, and as shown in FIG.
52b₁And the pyroelectric element 52b_TwoAnd the amplifier circuit 52b
_ThreeAnd the filter circuit 52b_FourAnd the comparison circuit 52b_FiveWhen,
Output circuit 52b₆And Optical system 52b₁Is a poly
With a condenser lens or reflector made of ethylene resin
Constitute. Pyroelectric element 52b_TwoIs the optical system 52b₁Light collection
And outputs a voltage corresponding to the change in infrared light. Amplifier circuit 5
2b_ThreeIs the pyroelectric element 52b_TwoAmplify the output voltage of
Output. Filter circuit 52b_FourIs an amplifier circuit 52b_Three
The noise component is removed from the output of
Output only Comparison circuit 52b_FiveIs the filter circuit 5
2b_FourThe output from the filter is compared with a predetermined threshold, and the filter circuit
52b _FourWhen the output from
Power circuit 52b₆Output the signal. Output circuit 52b
₆Is a comparison circuit 52b_FiveSignal from the human body
The output signal is output to the opening / closing controller 52a.

[0006] The daylight sensor 52c always operates by receiving power supply from the power supply 51, and constantly detects the ambient illuminance, which is the ambient brightness. When the illuminance is darker, a dark signal indicating that the ambient illuminance is darker than a predetermined illuminance value is output to the opening / closing control unit 52a.

The open / close control unit 52a always operates by receiving the power supply from the power supply unit 51, and outputs a logical product (AND) of the dark signal and the human body detection signal to the load open / close unit 5a.
3 is instructed to turn on, the load switch 53 is kept on for a predetermined time, and then the load switch 53 is turned off again.

Therefore, in the load switching device 50 with a human body detecting function as described above, the commercial power supply 1 → the load switching device 53
→ Other closed circuit of the load 2, it is necessary to ensure a closed circuit of the commercial power supply 1 → power supply unit 51 → operation unit 52, four wire connection terminals T _1, it is necessary with a ... T _4, When the load switchgear 50 with the human body detection function is installed, there is a problem that the number of wirings is increased.

Therefore, in order to solve the above-mentioned problems, the power supply unit 51, the operation unit 52, and the load switching unit 50 in the above-described load switching device 50 with a human body detection function are provided only by two electric wire connection terminals. JP-A 1-1
2. Description of the Related Art A two-wire wiring device disclosed in 33535 is known.

A two-wire wiring device disclosed in Japanese Patent Application Laid-Open No. 1-133535 is a remote control adapter 6 as shown in FIG.
0. The remote controller adapter 60 has two electric wire connection terminals T _{1 and} T ₂ and has a power supply 61 therein.
, An operation unit 62, a load switching unit 63, and an auxiliary circuit 64. The operation unit 62 includes an opening / closing control unit 62a and a remote control signal receiving unit 62b.

In the remote controller adapter 60 shown in FIG. 6, the auxiliary circuit 64 is connected to a circuit including the load 2 in parallel with the load switching
3 is provided with an impedance capable of reducing the load voltage to a level that does not lead to driving of the load 2 when the load 2 is off. Further, the power supply unit 61 is connected to a circuit including the load 2 in a state of being in series with each of the load switching unit 63 and the auxiliary circuit 64,
Regardless of ON / OFF of the load switching unit 63, the operation unit 62
(Opening / closing control section 62a and remote control signal receiving section 62b)
Power supply.

[0012]

However, in the above-described conventional two-wire wiring device, the power supply unit 61 always functions regardless of whether the load switching unit 63 is on or off. Are inserted in series in a circuit including the load 2. In addition, although a constant voltage element such as a constant voltage diode is used to always stably output a constant voltage from the power supply unit 61 connected in this way, the power supply unit 61 is driven when the load switching unit 63 is off. So that the load switch 6
Since the impedance of the auxiliary circuit 64 connected in parallel to 3 is increased, the current flowing through the power supply unit 61 differs greatly depending on whether the load switching unit 63 is turned on or off.

This means that the output voltage of the power supply section 61 becomes unstable and the element having a large current capacity is required to withstand an inrush current when the load is turned on (the load switching section 63 is turned on). It must be used, and a measure against heat generation is required, which results in an increase in size and cost. In recent years, inverter-type fluorescent lighting fixtures, which have become widespread due to energy conservation,
Compared to conventional incandescent lighting fixtures or fluorescent lighting fixtures using iron-copper type ballasts, a very large inrush current flows when a load is applied, and elements such as the constant voltage diode of the power supply unit 61 are easily destroyed. However, there is a problem that the circuit configuration for preventing the destruction becomes very complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to reduce the size regardless of the influence of load impedance, load current change due to load ON / OFF, and inrush current. And to provide an excellent two-wire wiring device.

[0015]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a load switching unit for controlling the supply of commercial power to a load; An operation unit that operates an opening / closing unit; a power supply unit that is supplied with power from the commercial power supply and supplies power to the operation unit; and supplies power to the operation unit when the commercial power supply is supplied to a load. A power supply auxiliary unit, wherein the power supply unit has an impedance of a level that does not lead to driving of the load when the load switching unit is in an off state. Are connected in parallel to the load switching unit, and the power supply unit
A front-stage power supply unit connected in parallel to the load switching unit;
Power supply from the unit and power to the operation unit
And an output voltage of the preceding-stage power supply unit.
The output voltage is set higher than the output voltage of the rear power supply.
Charges the power auxiliary unit and supplies power to the subsequent power unit.
It is characterized in that it is supplied .

According to a second aspect of the present invention, the load
The switching unit includes a snubber circuit in parallel, and the snubber circuit is
The load is off when the load switch is off and the load
When the opening / closing part is in the on state and from the on state to the off state
By the operation unit so that it is turned on when
A snubber circuit switching unit to be controlled is provided .

According to the third aspect of the present invention, the load is
A load switching unit for controlling the supply of commercial power
Operation for operating the load switching unit when power is supplied from a power supply
And a power supply from the commercial power supply to the operation unit.
And a power supply unit for supplying power.
The power supply unit is turned on when the load switching unit is off.
Note that the impedance of the level at which the load
Is connected in series with the load switching unit.
When the load switching unit is in the ON state and the load
When power is supplied to the power supply,
Power supply means, and the load switch
A snubber circuit in the column, said snubber circuit
The switch is off when the switch is in the off state, and the load switch
In the on state and when the state changes from the on state to the off state.
Controlled by the operating unit to be on when
A snubber circuit switching unit is provided .

According to a fourth aspect of the present invention, the load
The inrush current prevention unit is inserted in the path of the load current flowing through the load .

[0019]

[0020]

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a two-wire type wiring device according to the present invention will be described .
The embodiment showing the basic configuration of the tool is based on FIG.
The first embodiment will be described in detail based on FIG. 2 and the second embodiment will be described in detail based on FIG.

[Embodiment showing Basic Configuration of the Present Invention] FIG. 1 is a block diagram showing a load switching device with a human body detection function as a two-wire wiring device. In FIG. 1, 1 is AC
A 100 V AC commercial power supply, 2 is a load such as a lighting fixture whose on / off control is performed, and 10 is a load switching device with a human body detecting function corresponding to a two-wire wiring device.

As shown in FIG. 1, the load switchgear 10 with a human body detecting function includes two electric wire connection terminals T _{1 and} T _{2, and includes} therein a rectifier circuit section 11, a power supply section 12, An auxiliary power supply unit 13, an operation unit 14, and a load switching unit 15 are provided.

The rectifier circuit section 11 is a portion for rectifying an AC voltage obtained from the commercial power supply 1 including the load 2, is constituted by such as a diode bridge, the input of the diode bridge to the wire connecting terminal T _1, T ₂ Connecting. The power supply unit 12
The ripple is removed from the pulsating voltage supplied from the commercial power supply 1 including the load 2 through the rectifier circuit section 11 to smooth the ripple voltage, and after converting to a predetermined voltage, the auxiliary power supply section 13
And a power supply to the operation unit 14, and is constituted by a three-terminal regulator or the like. Further, the power supply section 12 has a 3
A high resistance of about 1 MΩ is connected to the input section such as a terminal regulator.

In order to increase the input impedance of the power supply 12, it is necessary to connect a high resistance to the input of the power supply 12,
The input impedance of the auxiliary power supply unit 13 connected to the output unit 2 and the input impedance of the operation unit 14 need to be as high as possible. That is, it is necessary to provide a charging current limit to the auxiliary power supply unit 13 and to design the operation unit 14 to consume as little current as possible.

The auxiliary power supply unit 13 supplies power to the operation unit 14 instead of the power supply unit 12 when the load switching unit 15 is in the ON state and the power supply unit 12 cannot supply predetermined power to the operation unit 14. And is constituted by a high-capacity storage element such as an electric double-layer capacitor or a storage battery.

The operation unit 14 is a unit that operates by always receiving power supply from the power supply unit 12 or the auxiliary power supply unit 13.
It includes an open / close control unit 14a, an infrared sensor unit 14b, and a daylight sensor unit 14c.

The infrared sensor section 14b is a section which always operates by receiving power supply from the power supply section 12 or the auxiliary power supply section 13, has a predetermined sensing area (not shown), and passes through this sensing area. It detects infrared rays emitted by the human body and outputs a human body detection signal to the opening / closing control unit 14a. Note that the internal configuration of the infrared sensor unit 14b is the same as that described with reference to FIG.

The daylight sensor section 14c is a section which always operates by receiving power supply from the power supply section 12 or the auxiliary power supply section 13. The daylight sensor section 14c is constituted by, for example, a CdS light receiving element or a photodiode, and has an ambient brightness. If the ambient illuminance is always detected and the ambient illuminance is darker than a predetermined illuminance value, a dark signal notifying the fact is sent to the opening / closing controller 1.
4a.

The open / close controller 14a is connected to the power supply 12
, And operates based on the logical product (AND) of the dark signal and the human body detection signal to turn on the load switching unit 15 and turn on the load switching unit 15 for a predetermined time. After the lapse of time, the load switching unit 15 is again instructed to turn off. The switching control unit 14a also performs an operation of forcibly turning off the load switching unit 15 only when there is an overcurrent signal from the inrush current prevention unit 15b, as described later.

The load switching section 15 is a section for making the output section of the rectifier circuit section 11 substantially short-circuited based on an instruction from the operation section 14. In this case, the load switching unit 15 is
For example, the switching unit 15a and the inrush current prevention unit 15
b, snubber circuit 15c, snubber circuit switch 15d
It is comprised including. The switching unit 15a is configured by a semiconductor switching element such as an FET, a thyristor, and a triac.

When the load 2 is a capacitive load such as an inverter-type fluorescent lamp illuminator, the inrush current prevention unit 15b has about 2 to 10 times the steady current when the switching unit 15a shifts from off to on. Inrush current may flow, suppress inrush current when detecting inrush current,
This protects the switching unit 15a from being broken by an inrush current.

When the load 2 is an inductive load such as a fluorescent lighting device using an iron-copper type ballast, the snubber circuit 15c is connected to the inductive load when the switching unit 15a shifts from the ON state to the OFF state. This is a part for preventing the electromotive load from generating a back electromotive force and applying the back electromotive force as a surge voltage to the switching unit 15a to destroy the switching unit 15a. The snubber circuit section 15c is generally formed of a series circuit of a resistor and a capacitor, is connected in parallel to the switching section 15a, and absorbs a surge voltage due to the back electromotive force applied to the switching section 15a.

The snubber circuit opening / closing section 15d is a section for connecting / disconnecting the snubber circuit section 15c to / from the switching section 15a as required. Snubber circuit switch 15d
When the snubber circuit section 15c is connected to the switching section 15a, a current flows through the snubber circuit section 15c even when the switching section 15a is in an off state, and as a result, the impedance of the load switchgear 10 with a human body detection function. Is reduced and the load 2 is turned on or driven by disconnecting the snubber circuit unit 15c from the switching unit 15a.

The snubber circuit opening / closing section 15d is off when the switching section 15a is off, and is on when the switching section 15a is on.
The opening / closing control unit 14a controls the switch 5a so that the switch 5a is on when the switch 5a changes from the on state to the off state. The snubber circuit opening / closing section 15d may be controlled by an operation section different from the opening / closing control section 14a.

The above-described load switchgear 10 with a human body detection function is connected as follows. That is, the electric wire connection terminal T ₁ is connected to _{one side} of the commercial power supply 1. The wire connection terminal T ₂ is connected to the other side of the commercial power supply 1 via the load 2. Further, the wire connection terminal T _1, T ₂ input section of the rectifier circuit 11 is connected.

The anode output section of the rectifier circuit section 11 is connected to the power supply section 1
2 and one of the switching units 15a and one of the snubber circuit switching units 15d. The other of the switching unit 15a is connected to one of the inrush current prevention units 15b,
The other of the snubber circuit opening / closing section 15d is connected to one of the snubber circuit sections 15c. The other of the inrush current prevention section 15b and the other of the snubber circuit section 15c are connected to the cathode output section of the rectification circuit section 11, respectively. The common section of the power supply section 12 is connected to the cathode output section of the rectifier circuit section 11. The output unit of the power supply unit 12 includes one of the auxiliary power supply unit 13, one of the open / close control units 14a, one of the infrared sensor units 14b, and the daylight sensor unit 14.
c. The other of the auxiliary power supply unit 13, the other of the open / close control unit 14a, and the infrared sensor unit 14b
And the other of the daylight sensor section 14c are connected to the cathode output section of the rectifier circuit section 11, respectively.

The load switchgear 10 with the human body detecting function constructed as described above operates as follows. In other words, the load switchgear 10 with a human body detection function when the surroundings are bright in the daytime or the like.
Wire connection terminal T ₁ of _the, connecting T ₂ to a commercial power source 1 including the load 2, daylight sensor unit 14c as the surroundings are bright is not possible to output a dark signal to the switching control unit 14a, the switching unit 15a Is kept off, and the power supply unit 12 of the load switchgear 10 with the human body detection function
a, while supplying power to the infrared sensor unit 14b and the daylight sensor unit 14c, a charging current is supplied to the auxiliary power supply unit 13 to charge the auxiliary power supply unit 13.

The auxiliary power supply unit 13 includes electric wire connection terminals T _1, T ₂
Is charged by the output voltage of the power supply unit 12 and rises from the point in time when it is connected to the commercial power supply 1 including the load 2, and is charged until it reaches a predetermined voltage. During this time, the switching control unit 14a is off, and the input impedance of the power supply unit 12 is set to a high impedance, so that the load switching device with a human body detection function 10 flows only a small amount of current. Do not lead to.

Thereafter, when the surroundings become dark at night, the daylight sensor section 14c outputs a dark signal to the opening / closing control section 14a. When a person, such as a visitor, enters a sensing area (not shown) of the infrared sensor unit 14b, the infrared sensor unit 14b outputs a human body detection signal to the opening / closing control unit 14a. Then, the open / close control unit 14a turns on the open / close control unit 14a for a predetermined period of time (for example, about 5 minutes) based on a logical product (AND) of the dark signal and the human body detection signal. At this time, if the load 2 is a capacitive load, a large rush current flows. Thus, the inrush current prevention unit 15b detects the inrush current and outputs an overcurrent signal for notifying the switching control unit 14a that an overcurrent is flowing.

Then, the opening / closing control section 14a gives an instruction to the switching section 15a to turn off immediately.
When the switching unit 15a is turned off, the overcurrent signal from the inrush current prevention unit 15b stops, so the switching control unit 14a again gives an instruction to the switching unit 15a to turn on. Thus, the opening / closing control unit 14
In FIG. 3A, although the on / off operation is repeated in a burst for a short period of several cycles of the commercial power supply 1, when the charge is accumulated in the capacitive component of the load 2 and a stable state is reached, the rush current is reduced and the normal load of the load 2 is reduced. When the rated current flows, the inrush current prevention unit 15b stops outputting the overcurrent signal, and the switching unit 15a is stably turned on.
The load 2 is stably turned on or driven.

When the switching unit 15a is on, the input voltage of the power supply unit 12 is almost zero volts, and the power supply unit 12 has enough power for the opening / closing control unit 14a, the infrared sensor unit 14b, and the daylight sensor unit 14c. Although the power supply cannot be performed, the auxiliary power supply 13
Is discharged, and the auxiliary power supply unit 13 supplies power to the open / close control unit 14a, the infrared sensor unit 14b, and the daylight sensor unit 14c instead of the power supply unit 12, so that the open / close control unit 14a The infrared sensor section 14b and the daylight sensor section 14c can continue to operate without stopping.

When a predetermined time, for example, 5 minutes, elapses, the switching control section 14a turns off the switching section 15a again, and the load 2 is turned off or stopped, and simultaneously the input voltage to the power supply section 12 is turned off. Returns. Thus, the power supply unit 12 can supply sufficient power to the opening / closing control unit 14a, the infrared sensor unit 14b, and the daylight sensor unit 14c, and can supply a sufficient charging current to the auxiliary power supply unit 13.

By the way, when the switching unit 15a shifts the switching unit 15a from the ON state to the OFF state,
First, an instruction is given to the snubber circuit switch 15d to turn on the snubber circuit switch 15d. Then, the snubber circuit 15c
Is inserted in parallel with the series circuit of the switching unit 15a and the inrush current prevention unit 15b. After such a state, the opening / closing control unit 14a gives an instruction to the switching unit 15a to turn off the switching unit 15a.

Therefore, even if the load 2 is an inductive load and the load 2 generates a back electromotive force and a high surge voltage is momentarily applied to the switching section 15a, the snubber circuit section 15c absorbs the surge voltage. As a result, destruction of the switching unit 15a is prevented. Then, immediately after the switching unit 15a shifts to the OFF state, the switching control unit 14a gives an instruction to the snubber circuit switching unit 15d, and
Is turned off, unnecessary current flowing through the snubber circuit section 15c even though the switching section 15a is in an off state is eliminated, and the impedance of the load switchgear 10 with a human body detection function is substantially increased.

That is, according to the load switchgear 10 with a human body detection function corresponding to the two-wire wiring device configured as described above, the power supply unit 12 is connected in parallel to the output unit of the power supply unit 12. Power supply unit 13 and operation unit 14 (opening / closing control unit 14
a, the power supply to the infrared sensor unit 14b and the daylight sensor unit 14c), but when the load switching unit 15 is off, the load switching device 10 with the human body detection function is much larger than the impedance of the load 2. Since the load 2 has an impedance, the load 2 can be reliably put into an inoperable state (a state in which lighting and driving cannot be performed).

The switching section 15a may be turned on or off, or the type of the load 2 may change from, for example, a fluorescent lighting fixture to an incandescent lighting fixture, so that the impedance of the load 2 changes. Even the operation unit 1
4 (opening / closing control section 14a, infrared sensor section 14b, daylight sensor section 14c) can be stably supplied. Further, the switching unit 15a can be protected from an inrush current flowing in the case of a capacitive load or the like, and the switching unit 15a can be protected from a surge voltage due to a back electromotive force generated in the case of an inductive load or the like.

[ First Embodiment] FIG. 2 is a block diagram showing a load switching device with a human body detection function as a two-wire wiring device. In FIG. 2, the same portions as those of the load switchgear with a human body detection function as a two-wire wiring device showing the basic configuration of the present invention shown in FIG. Detailed description is omitted.

The load switchgear 10 with a human body detection function shown in FIG. 2 is different from the embodiment showing the basic configuration of the present invention in that the power supply unit 12 is equivalent to the power supply unit in the preceding stage. And a power supply unit 12b corresponding to a subsequent power supply unit.

That is, in the load switching device 10 with the human body detecting function according to the embodiment showing the basic configuration of the present invention , the power supply unit 12 has the load switching unit 15 turned off. Period, the operation unit 14 (opening / closing control unit 14a and infrared sensor unit 1
4b and the daylight sensor 14c), and supplies a charging current to the auxiliary power supply 13 to charge the auxiliary power supply 13. Then, the load switching unit 15 is turned on, and the power supply unit 12 operates the operation unit 14 (the switching control unit 1).
4a, infrared sensor section 14b, and daylight sensor section 14c)
When the power cannot be supplied to the operation unit 14, the auxiliary power supply unit 13 discharges the electric charge stored so far and replaces the power supply unit 12 with the operation unit 14.
(Opening / closing control unit 14a, infrared sensor unit 14b, and daylight sensor unit 14c).

However, the auxiliary power supply 13
Operation unit 14 (opening / closing control unit 14a and infrared sensor unit 14b
And the daylight sensor 14c), and to supply power for a predetermined period, the charging voltage of the auxiliary power supply 13 is controlled by the operation unit 14 (opening / closing controller 14a, infrared sensor 14b, and daylight). It must be higher than the operating voltage of the optical sensor unit 14c).

Therefore, a power supply section 12a for charging the auxiliary power supply section for outputting a high voltage for charging the auxiliary power supply section 13 is provided at the front stage, and a power supply section 12b for outputting an output voltage lower than the output voltage of the power supply section 12a. Is provided downstream of the power supply unit 12a, and the operation unit 14 (opening / closing control unit 1) is connected to the power supply unit 12b.
4a, infrared sensor section 14b, and daylight sensor section 14c)
Power supply.

Therefore, in the load switchgear 10 with a human body detecting function according to the first embodiment, the operation unit 14 (opening / closing controller 14a, infrared sensor 14b, daylight sensor 1
4c), the charging voltage of the auxiliary power supply unit 13 can be increased with respect to the operating voltage of 4c. The device 10 can be driven.

[ Second Embodiment] FIG. 3 is a block diagram showing a load switching device with a human body detection function as a two-wire wiring device. In FIG. 3, the same parts as those of the load switchgear with a human body detection function as a two-wire wiring device of the embodiment showing the basic configuration of the present invention shown in FIG. The detailed description of the part is omitted.

The load switchgear 10 with a human body detecting function shown in FIG. 3 is different from that of the embodiment showing the basic configuration of the present invention in that the load switchgear 10 has a power supply instead of the auxiliary power supply 13. This is a configuration in which an on-time voltage generation circuit 16 corresponding to the means is provided. The on-time voltage generation circuit 16 generates a voltage using a load current flowing when the load switching unit 15 is in an on state, and supplies the generated voltage to the input unit of the power supply unit 12.

For example, the on-time voltage generating circuit 16 is configured using a transformer having a primary winding and a secondary winding, and a backflow prevention diode. That is, the load current flowing when the load switching unit 15 is in the ON state flows through the primary winding of the transformer. At this time, the voltage induced in the secondary winding of the transformer is supplied to the input section of the power supply section 12 via the backflow prevention diode. In addition, the cathode of the backflow prevention diode is connected to a subsequent stage having a high resistance of about 1 MΩ inserted into an input section of a three-terminal regulator or the like in order to increase the input impedance of the power supply section 12. By doing so, even if the auxiliary power supply unit 13 is not provided, the operation unit 14 (opening / closing control unit 14a and infrared sensor unit 1)
4b and the daylight sensor section 14c).

It should be noted that the present invention is not limited to the above embodiment, and the rectifier circuit section 11 can be omitted by making the power supply section 12 compatible with alternating current. The inrush current prevention section 15b, the snubber circuit section 15c, and the snubber circuit opening / closing section 15d may be omitted as appropriate, and the infrared sensor section 14b and the daylight sensor section 14c may be replaced by a wireless remote control receiving section. The present invention can be modified without departing from the spirit of the present invention, and includes all of these modifications.

[0058]

According to the first aspect of the present invention, it is possible to stably supply power to the operation unit irrespective of a change in the impedance of the load and the ON / OFF state of the load switching unit while having a simple configuration. When the load switch is off, the load can be reliably turned into an inoperable state (a state in which lighting and driving cannot be performed). There is an effect that it is possible to provide an excellent two-wire wiring device that can be reduced in size without taking measures.

Further, it is possible to provide an excellent two-wire wiring device which can always supply power stably to the operation unit irrespective of the ON / OFF state of the load switching unit while having a simple configuration with one power supply unit. This has the effect.

Further, it is possible to continuously operate the operation section for a long time by the power supply auxiliary section.
It is effective in providing an excellent two-wire wiring device.

According to the invention described in claim 2 , according to claim 1
In addition to the effects of the invention described above, even if the load is an inductive load, it is possible to absorb a surge voltage applied to the load switching unit due to back electromotive force generated when the load is turned off from the on state, This has the effect of providing an excellent two-wire wiring device with a long life and high reliability by reducing failures in the load switching unit.

According to the third aspect of the present invention, the power supply auxiliary unit
Even if there is no load, it does not affect the ON / OFF state of the load switch.
Power can be supplied stably to the operation unit without any problems.
It can provide excellent two-wire type wiring equipment that can be modeled.
Has the effect of Furthermore, even if the load is an inductive load,
An excellent 2 that can absorb surge voltage applied to the load switching unit due to back electromotive force generated when the load is changed from the on state to the off state, reduce the failure of the load switching unit, and have a long life and high reliability. An effect is provided that a wire-type wiring device can be provided.

According to the fourth aspect of the present invention, in addition to the effects of the first to third aspects of the present invention, even if the load is a capacitive load, the load changes from the off state to the on state. The present invention has the effect of reducing the inrush current generated when the power supply is turned off, reducing the failure of the load switching unit, and providing an excellent two-wire wiring device with a long life and high reliability.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a two-wire wiring device according to an embodiment having a basic configuration according to the present invention.

FIG. 2 is a block diagram showing a two-wire wiring device according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a two-wire wiring device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a conventional load switching device with a human body detection function.

FIG. 5 is a block diagram showing an infrared sensor section of a conventional load switching device with a human body detection function.

FIG. 6 is a block diagram showing an example of a conventional two-wire wiring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Commercial power supply 2 Load 10 2-wire wiring device 12 Power supply part 12a Front power supply part 12b Rear power supply part 13 Power supply auxiliary part 14 Operation part 15 Load switching part 15c Snubber circuit part 15d Snubber circuit switching part 16 Power supply means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02J 13/00-13/00 311 H04Q 9/00-9/16

Claims (4)

(57) [Claims] A load switch for controlling supply of commercial power to a load; an operation unit for operating the load switch; a power unit supplied with power from the commercial power and supplying power to the operation unit; A power supply auxiliary unit that supplies power to the operation unit when the commercial power is supplied to a load, wherein the power supply unit is in a state where the load switching unit is in an off state. When the load has an impedance of a level that does not lead to driving, while connecting the power supply unit in parallel with the load switching unit ,
The power supply unit includes a pre-stage power supply connected in parallel to the load switching unit.
A power supply unit, and a power supply from the preceding power supply unit,
And a post-stage power supply that supplies power to the
The output voltage of the power source section is set higher than the output voltage of the
And the former power supply unit charges the power auxiliary unit.
A two-wire wiring device for supplying power to a subsequent power supply unit . 2. The load switching unit has a snubber circuit in parallel.
In the snubber circuit, the load switching unit is in an off state.
Off when the load switch is on.
And on when going from on to off
A snubber circuit opening / closing unit controlled by the operation unit.
2-wire wiring device according to claim 1, comprising. 3. Controlling supply of commercial power to a load.
A load switching unit and the negative power supplied from the commercial power supply.
An operation unit for operating the load opening / closing unit, and a power supply from the commercial power supply.
And a power supply unit for supplying power to the operation unit when supplied.
A two-wire wiring device, wherein the power supply unit is the load switching unit
When the load is not driven when the
Load impedance.
Connected in series with the load switch
When supplying commercial power to the load
Power supply means for supplying power to the power supply unit is provided,
The load switching unit includes a snubber circuit in parallel with the snubber circuit.
The road is off when the load switch is in the off state.
The load switch is on and
The operation unit is turned on when it is turned off.
It has a snubber circuit opening / closing part controlled by
This is a two-wire wiring device. 4. A rush path for a load current flowing through the load.
Claim, characterized in that the insertion of the blocking unit 1-3
The two-wire wiring device according to claim 1.