KR20140030847A - Dc voltage generator and method for generating dc voltage - Google Patents

Abstract

The present invention relates to a DC power generation device and a generation method thereof capable of high efficiency compact design comprising an AC load unit which is driven by AC power; a switch unit which switches the AC load unit by using a control signal; a power transformer which is connected to both ends of the switch unit and transforms the AC power when the AC load unit turns off by using the switch unit; a first rectification and smooth unit which outputs DC power by rectifying and smoothing the voltage transformed in the power transformer; a second rectification unit which is connected to both ends of the switch unit and rectifies the voltage when the AC load unit turns of by using the switch unit; a second smooth unit which outputs the DC power by smoothing the voltage rectified in the second rectification unit; a first high voltage blocking unit which outputs the voltage rectified in the second rectification unit when the switch unit turns on under a predetermined level; a second high voltage blocking unit which blocks the output of the voltage rectified in the second rectification unit when the switch unit turns off; a constant voltage unit which offers the DC power to the DC load unit from the first rectification and smooth unit and the second rectification and smooth unit; and a zero cross photo triode AC unit which detects a zero point of the AC power and controls the switch unit according to an on/off control signal of the outside. [Reference numerals] (22) AC load unit; (23) Zero cross photo triode AC unit; (24) Power transformer; (25) First rectification unit; (26) Second rectification unit; (27) First high voltage blocking unit; (28) Constant voltage unit; (31) First smooth unit; (32) Second smooth unit; (33) Second high voltage blocking unit

Description

DC power generator and method for generating {DC voltage generator and method for generating DC voltage}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct current power generator, and more particularly, to a direct current power generator and a method for generating a compact design, which is simple, stable, and highly efficient.

In general, the switch device for opening and closing the power of the lighting and various loads in the building is formed between the power supply and the load supply for supplying power to control the operation of the lighting or various loads by turning on / off the power supply. The switch device is the most frequently used method of On / Off by human operation.

Recently, a simple touch control or remote control, a home automation (Building Control System) or a building control system (Building COntrol System) has been popularized for the convenience of a user in switching a load of a load device. Home automation and building control systems are designed to connect home and office lighting and electrical loads in a network so that they can be freely controlled regardless of time and place. In order to implement such a home automation and building control system, a communication module is provided in a power switching system that controls the operation of loads and loads in homes and offices.

In home automation and building control systems, a power switching circuit is essential to turn on / off lights or various loads, and a constant DC voltage supply is essential for the power switching circuit to operate.

However, the power switch circuit formed between the power supply terminal and the load terminal is stable because both terminals (power supply terminal and load terminal) should be shorted when various loads are on, and both terminals should be disconnected when various loads are off. DC power cannot be supplied. Therefore, a separate power supply line for the power switch device had to be formed separately or a battery was used.

Power supply of the power switch circuit which supplies only the low voltage portion of the AC power supply lower than the set voltage level among the AC power supplied to a predetermined load such as a lamp as a driving power supply of the power switch circuit without using a separate power supply device or a battery. The method was presented.

The power supply method of the conventional power switch circuit and a system for performing the same will be described with reference to the accompanying drawings.

1A to 1B are waveform diagrams for explaining a power supply method of a conventional power switch circuit.

The power supply method of the conventional power switch circuit is a method for making a DC power to operate a remote or automatic power switch to turn on / off the input AC power.

As shown in Figs. 1A to 1B, the voltage level required for the power switch circuit is set in the sine wave waveform of the AC power input, and then positive and negative negative waves of the AC power are input. Supply power lower than the voltage level set in the power switch circuit, and power higher than the set voltage level is supplied to the load stage when the load stage is turned on, and cuts off when the load stage is turned off.

FIG. 2 is a block diagram illustrating a configuration of a power supply system of a conventional power switch circuit, and FIG. 3 is a circuit diagram combining a power supply system of a conventional power switch circuit with a touch switch.

As shown in FIG. 2, a power supply system 100 of a power switch circuit is formed between one of two lines for supplying AC power 80V to 280V to a load terminal 50W to 5000W. do.

The power supply system 100 of the power switch circuit is connected to an input terminal of any one of two AC input terminals, and a power switching unit 130 is connected to an output side of the rectifying unit 110 for full-wave rectifying AC power. The power switching unit 130 supplies power lower than the voltage level (30Vp-p) set in the positive (+) positive and negative (-) negative waves of the input AC power to the switching power, and the set voltage level Higher power is supplied to the load stage when the load stage is on, and cut off when the load stage is off.

The switching power supply unit 150 is formed at the output side of the power switching unit 130. The switching power supply unit 150 is configured to receive only a power lower than the set voltage level 30Vp-p, and amplifies and smoothes the input power to supply driving power of the power supply system 100 of the power switch circuit. The power switching unit 130 is configured to receive a signal from the operation signal input unit 120.

The operation signal input unit 120 receives a power from the switching power supply unit 150 is formed with a touch switch 122 to operate by the user's contact. In addition to the touch switch 122, a wireless transmission / reception module 124 including an RF module operating by an RF frequency or an infrared (IR) module operating by an infrared signal is formed together.

The load stage operation monitoring unit 140 is configured to receive a signal from the switching power supply unit 150 and the operation signal input unit 120. The load stage operation monitoring unit 140 classifies the low signal and the high signal when the load stage On state in which power is supplied to the load stage and the load stage Off state in which the power supply is cut off to the load stage are divided into voltage differences. Output as a signal. The load stage operation monitoring unit 140 outputs the operation state of the load stage through the output terminal 142 at the time of remote control of the home automation and building control system so that the operation state of the load stage can be known at a remote place.

In the power supply system of the conventional power switch circuit configured as described above, assuming that the power required by the power switch circuit is 30 Vp-p among the AC power inputs, the power supply circuit is rectified by the rectifier 110 and then input by the power switch 130. Power lower than the set voltage level (30Vp-p) in AC power is supplied to the driving power of the power switch circuit, and power higher than the set voltage level is supplied to the load end (when the load end is on) or cut off (when the load end is off). )

The switching power supply unit 150 does not operate at a power supply higher than the set voltage level (30 Vp-p) or higher, but operates to amplify and smooth the power at a power supply lower than the set voltage level (30 Vp-p) or lower. do.

At this time, the smoothed voltage level occurs when the load stage is on or off, the load stage operation monitoring unit 140 detects the voltage to be charged and outputs a signal according to the operating state of the load stage And outputted through 142.

According to an embodiment of the power supply system of the conventional power switch circuit, as shown in FIG. 3, the rectifier 110 is connected to one output terminal of two output terminals of the AC power source (AC 80V to 280V), thereby providing commercial AC. Bridge diodes D1 to D4 for full-wave rectification of the power supply.

The operation signal input unit 120 includes a touch switch 122 at an input terminal of the J-K flip-flop 124 and the J-K flip-flop 124 connected to the output side of the bridge diodes D1 to D4 of the rectifier 110. In addition, a wireless transmit / receive module (not shown) including an RF module or an infrared (IR) module may be formed at the input terminal of the J-K flip-flop 124 together with the touch switch 122. One output of the output of the JK flip-flop 124 constituting the operation signal input unit 120 is input to the power supply switching unit 130, and the other output is input to the load stage operation monitoring unit 140. .

The power switch 130 is connected in series with the first and second resistors R1 and R2 at both ends of the output side of the rectifier 110. The signal of the JK flip-flop 124 constituting the operation signal input unit 120 is connected to the first resistor R1, and between the first and second resistors R1 and R2, the first transistor Q1 of the NPN type. ) Is connected to the base end. The emitter terminal of the first transistor Q1 is connected to receive power from the rectifier 110, and the collector terminal of the first transistor Q1 is connected to the cathode terminal of the zener diode ZD1. The anode terminal of the zener diode ZD1 is connected to the gate terminal of the silicon on coated rectifire (SCR) 132, which is a switching transistor formed between the load terminal and the rectifying unit 110, and is connected to the rectifying unit 110 through the third resistor R3. Connected. The other output of the output of the J-K flip-flop 124 constituting the operation signal input unit 120 is input to the load stage motion detection unit 140.

The load stage motion detector 140 is connected to the anode terminals of the diodes D1 and D4 constituting the rectifier 110 through fourth and fifth resistors R4 and R5 connected in series. The base terminal of the NPN fifth transistor Q5 is connected between the fifth resistors R4 and R5. The collector terminal of the fifth transistor Q5 is provided with a output terminal 142 for outputting a signal according to the on / off of the load terminal, and the emitter terminal of the fifth transistor Q5 is a diode constituting the rectifier 110 ( Connected to the anode ends of D1 and D4). The fourth resistor R4 of the load stage motion detection unit 140 is connected to the switching power supply unit 150.

In the switching power supply unit 150, an emitter terminal of the fourth transistor Q4 of the PNP type is connected to a cathode terminal of the diodes D2 and D3 constituting the rectifier 110, and the fourth transistor Q4 The collector stage is connected to the fourth resistor R4 and the charging capacitor C1 of the load stage motion detector 140. The base terminal of the fourth transistor Q4 is connected between the sixth and seventh resistors R6 and R7 connected in series to the cathode terminal of the diodes D2 and D3 constituting the rectifier 110. The seventh resistor R7 is connected to the collector terminal of the third transistor Q3 of the NPN type, and the base terminal of the third transistor Q3 is the collector of the eighth resistor R8 and the second transistor Q2 of the NPN type. It is connected between stages. The emitter stages of the second transistor Q2 and the third transistor Q3 are connected to the anode terminals of the diodes D1 and D4 constituting the rectifier 110. The base end of the second transistor Q2 is connected between the ninth and tenth resistors R9 and R10 connected in series to both ends of the rectifying unit 110.

The operation of one embodiment of the voltage supply system of the conventional power switch circuit configured as described above is as follows.

The full-wave rectified power from the rectifier 110 including bridge diodes D1 to D4 formed between one line connected to the input AC power source 80 to 280V and one line connected to the load terminal is the ninth resistor R9. Is applied to. When a signal for operating the load terminal is input to the wireless transceiver module 124 formed together with the touch switch 122 of the operation signal input unit 120, the JK flip-flop 124 applies a signal to the first resistor R1. do.

When a signal is applied to the first resistor R1, the first transistor Q1 is turned on to apply the full-wave rectified power from the rectifier 110 to the zener diode ZD1. Here, if the voltage level required in the power supply switching system 100 is 30 Vp-p, the breakdown voltage of the zener diode ZD1 is set to a voltage level of 30 Vp-p. When a power source having a voltage level equal to or higher than the set voltage level (for example, 30 Vp-p or higher) is applied to the zener diode ZD1 through the transistor Q1, the zener diode ZD1 exceeds the breakdown voltage and causes the SCR 132 to exceed the breakdown voltage. Apply a trigger voltage to the gate. As a result, the switching transistor SCR 132 is turned on, and only the AC power having a voltage level equal to or higher than the set voltage level (for example, 30 Vp-p or higher) is supplied to the load stage.

At this time, while the SCR 132, which is a switching transistor, is operated, the first transistor Q1 is continuously turned on, and as shown in FIG. 1A, a set voltage formed on both sides of a sine wave of an AC power input. Only the left side of the power supply below the level is not supplied to the load stage. When the trigger signal is applied to the gate, the SCR 132 is turned on to continuously supply AC power to the load stage, and is turned off when the voltage level reaches zero as shown in FIG. 1A.

Therefore, in FIG. 1A, the power of the hatched portion except for the black portion is applied to the load end. The full-wave rectified power from the rectifying unit 110 composed of bridge diodes D1 to D4 formed between one line connected to the input AC power source 80 to 280V and one line connected to the load terminal is connected to the power switching unit 130. At the same time it is applied to the switching power supply 150. In the switching power supply unit 150, the voltage level required by the power supply system 100 of the power switch circuit is set according to the resistance ratios of the ninth and tenth resistors R9 and R10 connected in series with both ends of the rectifier 110. do. That is, if the power required by the power supply system 100 of the power switch circuit is 30 Vp-p, for example, the resistance ratios of the ninth and tenth resistors R9 and R10 are set to a voltage level of 30 Vp-p. .

When a power source having a voltage level equal to or greater than the set voltage level (for example, 30 Vp-p or more) is input, power is applied to the base terminal of the second transistor Q2 through the ninth resistor R9 to supply the second transistor Q2. Is turned on. When the second transistor Q2 is turned on, since the third transistor Q3 is turned off, the charging capacitor C1 is not charged. However, when a power supply having a voltage level below the set voltage level (for example, 30 Vp-p or less) is input, the power supply passes through the ninth resistor R9, but the voltage is low so that the second transistor Q2 is turned off. . When the second transistor Q2 is turned off, the third transistor Q3 is turned on. When the third transistor Q3 is turned on, the current is amplified by the fourth transistor Q4 according to the resistance ratio of the sixth and seventh resistors R6 and R7 connected in series to charge the charging capacitor C1, and Smooth and convert to DC voltage.

The power converted into DC is an RF module operated by an RF frequency or an infrared (IR) module operated by an infrared signal when supplying power to a touch switch of the operation signal input unit 120 or remotely operating a load. Supply to the driving power of the configured wireless transmission and reception module 124.

In addition, the load stage operation detection unit 140 detects the case where the load end is on and the load end is off by using the smoothed DC voltage charged in the charging capacitor C1 of the switching power supply 150. do. That is, the DC voltage smoothed in the charging capacitor C1 causes a voltage difference when the load terminal is turned on and when the load terminal is turned off. However, the fourth and fifth resistors R4 and R5 of the load stage motion detection unit are generated. ) Is set so that the fifth transistor Q5 is turned on at the intermediate voltage thereof, and outputs to the terminal 142 whether the state of the load terminal is On / Off by displaying it as an LED or sending it to the central controller through the wireless transmission module. To make it possible.

However, such a power supply system of the conventional power switch circuit has the following problems.

First, in the power supply system of the conventional power switch circuit, the voltage level required for the power switch circuit is set, and then the voltage level set in the positive positive and negative negative waves of the AC power input. The lower power is supplied to the power switch circuit, and the power higher than the set voltage level is supplied to the load stage when the load stage is on, and cut off when the load stage is off.

Therefore, when there are a plurality of power switch circuits, the voltage level required for each of the power switch circuits may not be constant. If the required voltages are not constant, the power switching unit 130 of each power switch circuit may be The breakdown voltage of the zener diode ZD1 and the resistance ratios of the ninth and tenth resistors R9 and R10 of the switching power supply unit 150 must be set to a voltage level required for the power switch circuit.

In addition, when there are a plurality of power switch circuits, the voltage level required for each power switch circuit may not be constant, and when the required voltage is not constant like this, the required voltage level may be set to the largest value.

However, in such a case, for example, when the required voltage level of each power switch circuit is 10V, 15V, 20V and 30V, respectively, if the required voltage level is set to 30V, it is 11V in the power switch circuit requiring a voltage level of 10V. Since the voltage of 30V to 30V is not used as an AC load and a DC power load, power loss is large.

Second, in the power supply system of the conventional power switch circuit, the AC load current is configured to pass through the rectifier 110 to be applied to the load end. Thus, for example, when using an AC load of 2A (AC200V, 440W), when the current of 2A is conducted through the diode of the rectifier, and the average voltage of the DC load (power switch circuit) is 5V, the power consumption is 5V x 2A = 10W.

In this case, since the temperature resistance value of the diode is generally about 40 ° C. to 50 ° C. per W, in the power supply system of the conventional power switch circuit, heat of about 400 ° C. to 500 ° C. is generated from the diode of the rectifier 110. As a result, efficiency is lowered and power consumption is limited.

Third, in the power supply system of the conventional power switch circuit, the power is extracted only under the set voltage using the transistors Q2, Q3, and Q4 at the time of switching off.

Therefore, the power factor becomes very bad since only the set voltage is used at the AC voltage in the switched off state.

The present invention is to solve this problem, the delay of the switch (On) time (variable) in accordance with the DC load (electronic switch, communication module, etc.) at both ends of the switch of the AC (AC) load, Accordingly, the purpose of the present invention is to provide a DC power generator and a method of generating a DC voltage, thereby improving power efficiency and minimizing heat generation.

In accordance with an aspect of the present invention, a DC power generator includes: an AC load unit driven by an AC power source; A switch unit for switching the AC load unit by a control signal; A power transformer connected to both ends of the switch unit and configured to transform the AC power when the AC load unit is turned off by the switch unit; A first rectifying and smoothing unit rectifying and smoothing the voltage transformed by the power transformer to output a DC power source; A second rectifier connected to both ends of the switch to rectify the voltage when the AC load is turned on by the switch; A second smoothing unit outputting a DC power by smoothing the voltage rectified by the second rectifying unit; A first high voltage blocking unit outputting a voltage rectified by the second rectifying unit to a predetermined level or less when the switch unit is turned on; A second high voltage breaker to block an output of the voltage rectified by the second rectifier when the switch unit is turned off; A constant voltage unit for supplying DC power from the first rectifying and smoothing unit and the second rectifying and smoothing unit to a DC load unit; And a zero cross photo triac part for detecting a zero point of the AC power source and controlling the switch part according to an on / off control signal from the outside.

Here, the switch portion does not directly turned on, by made up of one or more triacs, wherein the one or more tri-malicious _{V GT (Gate Trigger Voltage),} I GT (Gate Trigger Current) and I _H (Holding Current) conditions, DC loads The switch-on delay time is characterized by.

The first high voltage blocking unit includes a first zener diode and a first MOSFET so that the first MOSFET is turned on when the voltage output from the second rectifier is less than or equal to the threshold voltage Vth of the first zener diode. It characterized in that the output voltage rectified by the rectifier.

The second high voltage blocking unit includes a second MOSFET, a third MOSFET, voltage divider resistors R6 and R7, and a second zener diode, and when the off control signal of the switch unit is applied, the second MOSFET is turned off. The zener voltage of the second zener diode is applied to the gate terminal of the third MOSFET by the resistor R7 and the second zener diode to turn on the third MOSFET, and the gate of the first MOSFET of the first high voltage blocking unit is turned on. The first MOSFET is turned off by grounding a terminal.

And detecting a temperature of the switch unit and further comprising a temperature monitoring and control unit to turn off the switch unit when the temperature of the switch unit is detected as a dangerous temperature.

In addition, the DC power generator according to the present invention for achieving the above object, AC load unit driven by AC power; A switch unit for switching the AC load unit by a control signal; A power transformer connected to both ends of the switch unit and configured to transform the AC power when the AC load unit is turned off by the switch unit; A first rectifying and smoothing unit rectifying and smoothing the voltage transformed by the power transformer to output a DC power source; A second rectifier connected to both ends of the switch to rectify the voltage when the AC load is turned on by the switch; A second smoothing unit outputting a DC power by smoothing the voltage rectified by the second rectifying unit; A first high voltage blocking unit outputting a voltage rectified by the second rectifying unit at a predetermined level when the switch unit is turned on; a second high voltage blocking unit blocking an output of the voltage rectified by the second rectifying unit when the switch unit is turned off; A constant voltage unit for supplying DC power from the first rectifying and smoothing unit and the second rectifying and smoothing unit to a DC load unit; On / off of the switch unit is controlled by receiving a switch control signal from the outside, and when the switch control signal is a switch on control signal from the outside, the load of the DC load unit is detected and the on of the switch unit according to the load of the DC load unit It is another feature that is provided with a DC voltage monitoring and control unit 35 to generate a delay time and delay by that time to turn on the switch.

On the other hand, DC power generation method according to the present invention for achieving the above object, the step of driving the AC load by turning on / off the switch in accordance with an external switch control signal; When the load unit is turned off, converting AC commercial power at both ends of the switch and rectifying and smoothing the transformed power through the first rectifying and smoothing unit to output a DC voltage; When the external control signal is a switch-on control signal, turning on the switch unit with a switch-on delay time according to a DC load at a zero point of an AC commercial power source; And rectifying and smoothing the AC commercial power at both ends of the switch through the second rectifying and smoothing unit during the switch-on delay time, thereby outputting a DC voltage.

In addition, the DC power generation method according to the present invention for achieving the above object comprises the steps of driving the AC load by on / off the switch in accordance with an external switch control signal; When the load unit is turned off, converting AC commercial power at both ends of the switch and rectifying and smoothing the transformed power through the first rectifying and smoothing unit to output a DC voltage; If the external control signal is a switch-on control signal, detecting a load amount of the DC load unit, generating an ON delay time of the switch unit according to the load amount of the DC load unit, and turning on the switch unit by the time delay; Rectifying and smoothing the AC commercial power at both ends of the switch through the second rectification and smoothing unit during the switch-on delay time to output a DC voltage.

In the DC power generator and the generating method according to the present invention having the characteristics as described above has the following effects.

First, when the DC power generating device according to the present invention is switched on, the switch-on delay time is changed according to the DC load amount, and the output DC voltage is also varied according to the DC load amount, thereby outputting an appropriate DC power according to the DC load amount. It is more efficient because it can supply more power to the AC load.

 Second, since the first and second rectifying parts and the smoothing part are installed at both ends of the switch part, when the load is ON, current is supplied to the AC load without passing through the rectifying part. Therefore, there is no limitation on the load capacity and can be easily applied to the control of the large load.

In addition, it is possible to prevent a decrease in load capacity due to heat generation of the rectifier diode.

Third, in the present invention, since the DC power is extracted using the power transformer when the switch is Off, the power factor drop does not occur.

1A to 1B are waveform diagrams for explaining a power supply method of a conventional power switch circuit.
2 is a block diagram illustrating a configuration of a power supply system of a conventional power switch circuit.
3 is a circuit diagram combining a power supply system of a conventional power switch circuit with a touch switch;
4 is a block diagram illustrating a configuration of a DC power generator according to a first embodiment of the present invention.
5 is a circuit diagram of a DC power generator according to a first embodiment of the present invention.
6 is a voltage curve diagram according to the DC load capacity in the DC power generator according to the first embodiment of the present invention
7 is a comparative voltage curve diagram when the DC load capacity is large and small in the DC power generator according to the first embodiment of the present invention.
8 is a block diagram illustrating a configuration of a DC power generator according to a second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A DC power generating apparatus and a generating method according to the present invention having the above characteristics will be described in detail with reference to the accompanying drawings.

4 is a block diagram of a DC power generator according to a first embodiment of the present invention, and FIG. 5 is a circuit diagram of a DC power generator according to the present invention.

As shown in FIGS. 4 and 5, the DC power generator according to the present invention includes a power inlet 21 into which an AC commercial power source (AC 220V) is drawn, and an AC load unit 22 driven by an AC power source. ), A switch unit 30 for switching the AC load unit 22 by a control signal, and connected to both ends of the switch unit 30 so that the AC load unit 22 is turned off by the switch unit 30. A power transformer 24 for transforming (stepping down) the AC power, a first rectifier 15 for rectifying the voltage transformed by the power transformer 24, and a voltage rectified by the first rectifier 25. A first smoothing unit 31 that smoothes and outputs DC power, and a second rectifying unit connected to both ends of the switch unit 30 to rectify the voltage when the AC load unit 22 is turned on by the switch unit 30. (26), the second smoothing unit 32 for outputting the DC power by smoothing the voltage rectified in the second rectifying unit 26, and the on-state of the switch unit 30 The first high voltage interrupter 27 outputs the voltage rectified by the second rectifier 26 to a predetermined level or less, and blocks the output of the voltage rectified by the second rectifier 26 when the switch 30 is turned off. A constant voltage unit for supplying DC power from the second high voltage interrupter 33, the first rectifier 25 and the smoother 31, the second rectifier 26, and the smoother 32 to the DC load. And zero-cross photo for detecting the zero point of the AC power supply and controlling the switch unit 30 according to an on / off control signal of the switch unit 30 from the outside. TRIAC) section 23 is configured.

Here, the zero-cross photo TRIAC unit 23 receives an on / off control signal of the switch unit 30 from the outside and is turned on / off by a photo coupler PT1 and an AC power terminal. It has a resistor (R1) connected to.

The switch unit 30 has a structure in which two triacs D1 and D2 are connected in series.

The first rectifying part and the smoothing parts 25 and 31 include the bridge diode D3 and the smoothing capacitor C1, and the second rectifying part 26 and the smoothing part 32 include the bridge diode D5 and the smoothing capacitor ( C2).

In addition, the first high voltage blocking unit 27 includes a resistor R5, a zener diode D4, and an n-MOSFET Q1 so that the voltage output from the second rectifying unit 26 is reduced to that of the zener diode D4. When the threshold voltage Vth or less, the n-MOSFET Q1 is turned on to output the voltage rectified by the second rectifier 26.

The second high voltage blocking unit 33 includes an n-MOSFET Q2, an n-MOSFET Q3, voltage divider resistors R6 and R7, and a zener diode D6. When the off control signal of the switch unit 30 is applied, the n-MOSFET Q2 is turned off, and the zener voltage of the zener diode D6 is set by the voltage divider R7 and the zener diode D6. Since it is applied to the gate terminal of the n-MOSFET Q3, the n-MOSFET Q3 is turned on to ground the gate terminal of the n-MOSFET Q1 of the first high-voltage blocking unit 27, so that the n-MOSFET ( Q1) is turned off so that the voltage rectified by the second rectifier 26 is not transmitted to the second smoother 32.

The power transformer 24 has a capacity suitable for the total driving power required, and the primary side of the power transformer 24 is connected to both ends of the switch unit 30 so that the AC is turned off when the switch unit 30 is turned off. The voltage of the power supply flows through the AC load unit 22, and the voltage applied to the power supply transformer 24 is divided according to the values of reactance components of the AC load unit 22 and the power supply transformer 24. The divided voltage is applied to the primary winding of the power transformer 24 and an output voltage is obtained at the secondary according to the ratio of the primary and secondary windings of the power transformer 24.

The AC output on the secondary side stepped down by the winding ratio is rectified by the bridge diode of the first rectifying section 25 and smoothes the pulsation rectified by the first smoothing section 31 to a constant DC voltage. The DC voltage obtained after smoothing is supplied to the constant voltage unit 28.

In the above, the specification of the power transformer 24 depends on the total power required of the DC power generator to which the power system of the present invention is applied, and the input voltage of the primary winding is selected as the maximum rating up to AC230V and the number of secondary windings Is determined according to the above-described trans relational expression Vout / Vin = N2 / N1 = I1 / I2 according to the required voltage of the DC power generator.

The operation of the DC voltage generator according to the first embodiment of the present invention configured as described above is as follows.

6 is a voltage curve diagram according to DC load capacity in the DC power generator according to the first embodiment of the present invention, and FIG. 7 is a large DC load capacity in the DC power generator according to the first embodiment of the present invention. The comparison voltage curve when and.

The zero cross photo triac part 23 receives an external control signal or a control signal such as a touch switch to control the switch 30 on / off.

In addition, the AC load unit 22 is driven or not driven according to the ON / OFF of the switch unit 30.

That is, when the external control signal is a switch-off control signal, the photo triac PT1 of the zero cross photo triac part 23 is turned off to the gate terminals of the triacs D1 and D2 of the switch part 30. Since no voltage is supplied, the switch unit 30 is turned off, and when the external control signal is a switch-on control signal, the photo triac PT1 of the zero cross photo triac unit 23 is turned on so that the switch unit 30 is turned on. Since the voltage is supplied to the gate terminals of the triacs D1 and D2, the switch unit 30 is turned on.

First, when the external control signal is a switch-off control signal (low logic value), the photo triac PT1 of the zero cross photo triac part 23 is turned off, so that the triac D1, The case where the switch unit 30 is off because no voltage is supplied to the gate terminal of D2) will be described below.

When the switch unit 30 is off and the AC load unit 22 is not driven, AC commercial power (AC 220V) is connected to the power transformer 24 through both ends of the switch unit 30. The power transformer 24 converts (steps down) the AC commercial power according to the winding ratio of the primary side and the secondary side, and outputs the first rectifying unit 25 and the smoothing unit 31. The voltage output at 24 is rectified and smoothed to provide a DC voltage to the constant voltage unit 28.

At this time, even if the AC power is applied to both ends of the switch unit 30 by the second rectifying unit 26, the n-MOSFET Q2 of the second high voltage blocking unit 33 receives a switch-off control signal at the gate terminal. N-MOSFET Q2 is turned off. Therefore, the Zener voltage of the Zener diode D6 is applied to the gate terminal of the n-MOSFET Q3 by the voltage divider R7 and the Zener diode D6, so that the n-MOSFET Q3 is turned on to thereby turn the first voltage. Since the gate terminal of the n-MOSFET Q1 of the high voltage blocking unit 27 is grounded, the n-MOSFET Q1 is turned off so that the voltage rectified by the second rectifying unit 26 is the second smoothing unit 32. Is not passed).

Next, when the external control signal is a switch-on control signal, the photo triac PT1 of the zero cross photo triac part 23 is turned on to the gate terminals of the triacs D1 and D2 of the switch part 30. The case where the switch unit 30 is turned on by supplying a voltage is as follows.

When an external control signal that is a switch-on control signal is input to the zero cross photo triac part 23, the zero cross photo triac part 23 is an AC commercial power source (AC 220V) drawn into the power inlet part 21. The driving signal is output to the gate terminals of the triacs D1 and D2 of the switch unit 30 at a zero point of. However, a triac (D1, D2) will not be immediately turned on by the V _GT (Gate Trigger Voltage), I _GT (Gate Trigger Current) and I _H (Holding Current) conditions, DC loading of the switch unit 30 This results in a switch-on delay time.

At the same time, since the external control signal (high logic value) which is the switch-on control signal is also input to the second high voltage interrupter 33, the n-MOSFET Q2 of the second high voltage interrupter 33 is turned on. Is on. Accordingly, since the voltage divided by the voltage divider R6 and R7 is not applied to the gate terminal of the n-MOSFET Q3, the n-MOSFET Q3 is turned off so that the first high voltage breaker 27 Does not ground the gate terminal of the n-MOSFET Q1. Therefore, since the voltage rectified by the second rectifier 26 is applied to the gate terminal of the n-MOSFET Q1 through the resistor R5 of the first high voltage interrupter 26, the n-MOSFET Q1 is The voltage that is turned on and rectified by the second rectifier 26 is transferred to the second smoother 32.

By this operation, as shown in Fig. 6, in the period from the zero point of the AC voltage until the triacs D1 and D2 of the switching unit 30 are turned on after the on delay time, the second The rectifier 26 and the second smoother 32 rectify and smooth the commercial power to provide a DC voltage to the constant voltage unit 28. In the remaining section, power is supplied to the AC load unit 22.

Here, as shown in FIG. 7 showing the voltage curve according to the DC load capacity, in the case of DC load 1> DC load 2, the ON delay time of the switch unit 30 is variably generated according to the DC load usage. .

The zener diodes D4 and D6 of the first and second high voltage interrupters 27 and 33 may be output when the voltage equal to or greater than the threshold voltage of the zener diodes D4 and D6 is output from the second rectifier 26. The above voltage is prevented from passing through the n-MOSFETs Q1 and Q2.

The driving method of the DC power generator according to the present invention configured as described above is summarized as follows.

The load unit 22 is driven by turning on / off the switch unit 30 according to an external switch control signal.

In addition, when the load unit 22 is turned off by turning off the switch unit 30, the AC commercial power (AC 220V) is connected to the power transformer 24 through both ends of the switch unit 30. Supplied, transformed (stepped down) according to the winding ratios of the primary side and the secondary side of the power transformer 24, rectified and smoothed through the first rectifying unit 25 and the smoothing unit 31, and outputted as a DC voltage. .

At this time, even if the AC power is applied to both ends of the switch unit 30 by the second rectifying unit 26, the voltage rectified by the second rectifying unit 26 by the second high voltage blocking unit 33 is second. It is not transmitted to the smooth portion 32.

When the external control signal is a switch-on control signal, the photo triac PT1 of the zero cross photo triac part 23 is turned on to the gate terminals of the triacs D1 and D2 of the switch part 30. The switch unit 30 is turned on by supplying a voltage.

At this time, the zero cross photo triac 23 may be triacs D1 and D2 of the switch unit 30 at a zero point of the AC commercial power AC 220V drawn into the power inlet 21. Outputs a drive signal to the gate terminal. However, the triacs D1 and D2 of the switch unit 30 are not immediately turned on, and a switch-on delay time occurs according to the DC load amount.

During the on delay time, the voltage rectified by the second rectifying unit 26 by the second high voltage blocking unit 33 and the first high voltage blocking unit 27 is transmitted to the second smoothing unit 32 to provide a direct current. The voltage is output.

When the switch unit 30 is turned on and the load unit 22 is driven, the above process is repeated to output a DC voltage during a switch-on delay time at a zero point of the AC commercial power supply AC 220V. .

Meanwhile, the driving of the switch unit may be controlled by directly monitoring the DC load voltage. Such an embodiment will be described with reference to the accompanying drawings.

8 is a block diagram of a DC power generator according to a second embodiment of the present invention.

As shown in FIG. 8, the DC power generator according to the second embodiment of the present invention includes a power inlet 21 through which AC commercial power (AC 220V) is input, and an AC load unit driven by AC power. (22), a switch unit 30 for switching the AC load unit 22 by a control signal, and connected to both ends of the switch unit 30, the AC load unit 22 by the switch unit 30 A power transformer 24 for transforming (stepping down) the AC power, a first rectifying unit 15 for rectifying the voltage transformed by the power transformer 24, and a rectified voltage in the first rectifying unit 25. A first smoothing unit 31 for smoothing a voltage and outputting a DC power supply, and a second smoothing unit 31 connected to both ends of the switch unit 30 to rectify the voltage when the AC load unit 22 is turned on by the switch unit 30; 2 rectifying section 26, a second smoothing section 32 for outputting a DC power by smoothing the voltage rectified in the second rectifying section 26, and when the switch section 30 is turned on A first high voltage interrupter 27 outputting a voltage rectified by the second rectifier 26 at a predetermined level, and an output of the voltage rectified by the second rectifier 26 when the switch 30 is turned off; Constant voltage which supplies DC power from the 2nd high voltage interrupter 33 which interrupts | blocks, and the said 1st rectification part 25 and the smoothing part 31, the 2nd rectifying part 26, and the smoothing part 32 to a DC load part. The unit 28, the DC load unit 34 driven by the DC voltage output from the constant voltage unit 28, and receives a switch control signal from the outside to control the on / off of the switch unit 30 When the switch control signal is the switch-on control signal from the outside, the load amount of the DC load unit 34 is detected and the ON delay time of the switch unit 30 is generated according to the load amount of the DC load unit 34. DC voltage monitoring and control unit 35 to turn on the switch unit 30 by delaying the time. It is open configuration.

The DC power generator of the first embodiment of the present invention uses a zero-cross photo TRIAC unit 23, but the DC power generator of the second embodiment of the present invention uses the zero cross photo triac. There is a difference in using the DC voltage monitoring and the control unit 35 instead of the (zero-cross photo TRIAC) unit 23.

That is, in the DC power generator according to the first embodiment of the present invention, the zero cross photo triac unit 23 receives an AC commercial power source introduced into the power inlet unit 21 when an external switch-on control signal is input. The driving signal was output to the gate terminals of the triacs D1 and D2 of the switch unit 30 at a zero point of AC 220V, and the triacs D1 and D2 of the switch unit 30 were immediately It is not turned on and a switch-on delay time occurs depending on the DC load.

However, in the DC power generator of the second embodiment of the present invention, the DC voltage monitoring and control unit 35 is configured to operate even if the switch unit 30 is not constituted by triacs D1 and D2. The load amount of the DC load unit 34 is detected, and the ON delay time of the switch unit 30 is generated according to the load amount of the DC load unit 34, and delayed by that time at the zero point of the AC power source. Turn on 30).

Therefore, the operations of the remaining parts of the DC power generator of the second embodiment of the present invention are the same as those of the DC power generator of the first embodiment of the present invention, and therefore the operation and configuration thereof are omitted.

On the other hand, during load control using an electronic switch, a heat generation phenomenon occurs according to the load capacity. This can cause system breakage and fire. Therefore, by adding a temperature monitor and a control unit to the switch unit, when the dangerous temperature is detected, the switch unit 30 is automatically turned off to prevent system damage and fire.

The technical idea of the present invention has been specifically described according to the above preferred embodiments, but the above-mentioned embodiments are intended to be illustrative and not restrictive. In addition, it will be understood by those of ordinary skill in the art that various embodiments are possible within the scope of the technical idea of the present invention. Accordingly, the scope of the present invention should be determined by the claims rather than the examples described.

21: power inlet 22: AC load
23: zero cross photo triac 24: power transformer
25: first rectifier 26: second rectifier
27: first high voltage interruption unit 28: constant voltage unit
30: switch part 31: first smoothing part
32: second smoothing part 33: second high voltage breaking part
34: DC load part 35: DC voltage monitoring and control unit

Claims (11)

An AC load unit driven by an AC power source;
A switch unit for switching the AC load unit by a control signal;
A power transformer connected to both ends of the switch unit and configured to transform the AC power when the AC load unit is turned off by the switch unit;
A first rectifying and smoothing unit rectifying and smoothing the voltage transformed by the power transformer to output a DC power source;
A second rectifier connected to both ends of the switch to rectify the voltage when the AC load is turned on by the switch;
A second smoothing unit outputting a DC power by smoothing the voltage rectified by the second rectifying unit;
A first high voltage blocking unit outputting a voltage rectified by the second rectifying unit at a predetermined level when the switch unit is turned on;
A second high voltage breaker to block an output of the voltage rectified by the second rectifier when the switch unit is turned off;
A constant voltage unit for supplying DC power from the first rectifying and smoothing unit and the second rectifying and smoothing unit to a DC load unit;
And a zero cross photo triac part configured to detect a zero point of the AC power and control the switch part according to an on / off control signal from the outside. The method of claim 1,
The switch portion does not directly turned on, by made up of one or more triacs, wherein the one or more tri-malicious _{V GT (Gate Trigger Voltage),} I GT (Gate Trigger Current) and I _H (Holding Current) conditions, depending on the DC load DC power generating device having a switch-on delay time. The method of claim 1,
The first high voltage blocking unit includes a first zener diode and a first MOSFET so that the first MOSFET is turned on when the voltage output from the second rectifier is less than or equal to the threshold voltage Vth of the first zener diode. DC power generator, characterized in that for outputting the rectified voltage from the rectifier. The method of claim 3, wherein
The second high voltage blocking unit includes a second MOSFET, a third MOSFET, voltage divider resistors R6 and R7, and a second zener diode, and when the off control signal of the switch unit is applied, the second MOSFET is turned off. The zener voltage of the second zener diode is applied to the gate terminal of the third MOSFET by the resistor R7 and the second zener diode to turn on the third MOSFET, and the gate of the first MOSFET of the first high voltage blocking unit is turned on. And the first MOSFET is turned off by grounding a terminal. The method of claim 1,
And a temperature monitoring and control unit for sensing the temperature of the switch unit to turn off the switch unit when the temperature of the switch unit is detected as a dangerous temperature. An AC load unit driven by an AC power source;
A switch unit for switching the AC load unit by a control signal;
A power transformer connected to both ends of the switch unit and configured to transform the AC power when the AC load unit is turned off by the switch unit;
A first rectifying and smoothing unit rectifying and smoothing the voltage transformed by the power transformer to output a DC power source;
A second rectifier connected to both ends of the switch to rectify the voltage when the AC load is turned on by the switch;
A second smoothing unit outputting a DC power by smoothing the voltage rectified by the second rectifying unit;
A first high voltage blocking unit outputting a voltage rectified by the second rectifying unit at a predetermined level when the switch unit is turned on;
A second high voltage breaker to block an output of the voltage rectified by the second rectifier when the switch unit is turned off;
A constant voltage unit for supplying DC power from the first rectifying and smoothing unit and the second rectifying and smoothing unit to a DC load unit;
On / off of the switch unit is controlled by receiving a switch control signal from the outside, and when the switch control signal is a switch on control signal from the outside, the load of the DC load unit is detected and the on of the switch unit according to the load of the DC load unit And a DC voltage monitoring and control unit (35) for generating a delay time and delaying the delay time to turn on the switch unit. Driving the AC load unit by turning on / off the switch unit according to an external switch control signal;
When the load unit is turned off, converting AC commercial power at both ends of the switch and rectifying and smoothing the transformed power through the first rectifying and smoothing unit to output a DC voltage;
When the external control signal is a switch-on control signal, turning on the switch unit with a switch-on delay time according to a DC load at a zero point of an AC commercial power source;
And rectifying and smoothing the AC commercial power at both ends of the switch through the second rectifying and smoothing unit during the switch-on delay time, to output a DC voltage. The method of claim 7, wherein
The DC load by the switching unit is composed of one or more of the triac, the switch-on delay time of the one or more tri-malicious _{V GT (Gate Trigger Voltage),} I GT (Gate Trigger Current) and I _H (Holding Current) conditions DC power generation method characterized in that it is determined according to. The method of claim 7, wherein
And sensing the temperature of the switch unit to turn off the switch unit when the temperature of the switch unit is detected as a dangerous temperature. Driving the AC load unit by turning on / off the switch unit according to an external switch control signal;
When the load unit is turned off, converting AC commercial power at both ends of the switch and rectifying and smoothing the transformed power through the first rectifying and smoothing unit to output a DC voltage;
If the external control signal is a switch-on control signal, detecting a load amount of the DC load unit, generating an ON delay time of the switch unit according to the load amount of the DC load unit, and turning on the switch unit by the time delay;
And rectifying and smoothing the AC commercial power at both ends of the switch through the second rectifying and smoothing unit during the switch-on delay time, to output a DC voltage. 11. The method of claim 10,
And sensing the temperature of the switch unit to turn off the switch unit when the temperature of the switch unit is detected as a dangerous temperature.

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