KR101681696B1 - control device of current or voltage overlapping for earth leakage breaker - Google Patents

Abstract

More particularly, the present invention relates to a DC power supply (DC current or DC voltage) generated by a DC power generator and a leakage current (or a voltage corresponding to a leakage current) detected by a leakage current sensor, (Current or voltage) superimposition control device of an earth leakage breaker that improves the sensitivity of detecting an electrical leak and improves the tripping performance for opening a power line at the time of electrical leakage.
A control device for an earth leakage breaker according to the present invention includes: a zero-phase current transformer (ZCT) for detecting a leakage current generated from a power line; A trip driver for shutting off a power supply line when leakage current is detected by the leakage current detector; A DC power generator for generating a DC power using a power source of a power line; And a drive control unit driving the trip driving unit by driving the overlapped power source of the leakage current detected by the leakage current sensing unit and the direct current output from the direct current power generating unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

More particularly, the present invention relates to a DC power supply (DC current or DC voltage) generated by a DC power generator and a leakage current (or a voltage corresponding to a leakage current) detected by a leakage current sensor, (Current or voltage) superimposition control device of an earth leakage breaker that improves the sensitivity of detecting an electrical leak and improves the tripping performance for opening a power line at the time of electrical leakage.

The earth leakage breaker has a function of detecting a short circuit when a short circuit is detected and cutting off electricity in use, and is provided with a control device for detecting a short circuit and opening a power line.

The leakage circuit breaker is a means to prevent electric shock by detecting a predetermined leakage current (typically 15mA to 30mA), and measures the difference between the current flowing through the power line and the current flowing through the neutral line, Otherwise, it judges that there is a short circuit and cuts off the current.

The leakage circuit breaker includes a leakage current detector (ZCT: Zero-phase current transformer (Hall sensor)) for detecting a leakage current generated from a power supply line, and a leakage current detector And a trip driving unit for turning off the power supply when a current flows due to a large current flowing under the control of the control unit.

Such a conventional earth leakage breaker detects the change of the input / output current of the leakage current sensing unit or the change of the magnetic flux by the current flowing through the power line to judge whether or not the leakage occurs.

Related prior art data includes Korean (KR) patent publications 10-2004-0099982, 10-2011-0053193, 10-1402046, 10-0827208, and registration office 20-0428420.

FIG. 1 shows a control apparatus for a circuit breaker according to the prior art 10-0827208. 1, a first leakage current sensing unit 10 is provided to detect a ground fault current from power supply lines L1 and L2 connected to a load side. The first leakage current sensing unit 10 senses a signal sensed by the first leakage current sensing unit 10, An A / D converter 30 for converting an analog signal into a digital signal, and an overall control function of an earth leakage breaker, so that an operation control signal is applied to the trip driver 50 A tripping detector 50 for blocking the current flowing to the power lines L1 and L2 when a leakage current is generated and a power supply unit 60 for supplying operation power to the earth leakage breaker, .

The first leakage current sensing unit 10 is configured to detect a ground fault current due to the occurrence of a leakage current from the power supply lines L1 and L2. The first leakage current sensing unit 10 detects a leakage current, (20).

The signal output from the amplifying unit 20 is converted into an analog signal by the A / D converter 30, and the converted digital signal is applied to the electrical leak detecting unit 40.

The electrical leak detecting section 40 compares a signal applied from the A / D converter 30 with a set reference level that is a criterion for judging leakage, and judges whether or not a leakage current has occurred. If the leakage current flowing to the load is determined to be equal to or greater than a set reference value To the trip driver (50).

The trip driving unit 50 performs a switching switching operation to open or close the electric circuit according to a control signal transmitted from the electric leakage detecting unit 40 by shutting off the power supply applied to the load in the occurrence of a short circuit. The switching unit applied to the trip driving unit 50 may be a contactless semiconductor device such as a silicon controlled rectifier (SCR).

The power supply unit 60 supplies AC power to the DC power supplies from the power supply lines L1 and L2 by supplying driving power to the respective circuit units constituting the earth leakage breaker.

The leakage current sensing unit is mainly used as a zero-phase current transformer (ZCT), and the output voltage at the time of outputting the current sensed by the image current transformer is proportional to the number of turns of the coil in the image current transformer.

However, when the leakage current level of the power source is in the range of 15 mA to 30 mA, the output voltage of the image deflector is about 0.25V to 0.35V. The output voltage of the phase current transformer is insufficient for the gate input ON signal voltage level of the silicon controlled rectifier (SCR), which is a switching means applied to the control unit for controlling the trip driving unit, Can not be performed.

Thus, in order to increase the output voltage of the video deflector, the number of turns of the coil in the deflector is increased. This method is an undesirable solution due to an excessive increase in cost and volume.

As another method of increasing the output voltage of the video current transformer, the output voltage of the video current transformer is amplified by the amplifying IC. This method is cost competitive because the amplifying IC is expensive.

In addition, a driving power source of a switching element (for example, SCR, transistor, triac, etc.) of the driving control section for controlling the trip driving braking to turn on / off the power source line is turned on due to the influence of ambient temperature.

Therefore, in order to reliably open (turn off) the power supply line when the leakage current occurs above the set value, it is necessary to correct the influence depending on the ambient temperature.

However, in the prior art, the influence of the ambient temperature is not corrected.

The present invention has been devised in order to solve the problems of the ground fault circuit breaker according to the prior art as described above, and it is an object of the present invention to provide a circuit breaker which is capable of increasing the number of coil windings of a video current transformer or shutting off a power line even at a low level of leakage current , That is, an electric power superimposition control device for an earth leakage breaker having excellent leakage sensitivity.

In addition, as the driving control unit, when the ambient temperature is changed according to the temperature characteristic of the switching device, the intensity of the voltage input to the gate terminal of the switching device is controlled so that the power source line is opened, Another object of the present invention is to provide a power supply overlap control device for an earth leakage breaker having excellent operation reliability.

Another object of the present invention is to provide a power supply overlap control apparatus for an earth leakage breaker which is capable of preventing an error that is determined to be a short circuit at the time of initial power input by being excellent in the leakage current sensitivity and capable of protecting against overvoltage.

The power supply overlap control device of the earth leakage breaker according to the present invention

A zero-phase current transformer (ZCT) for detecting a leakage current generated in a power line;

A trip driver for shutting off a power supply line when leakage current is detected by the leakage current detector;

A DC power generator for generating a DC power using a power source of a power line;

And a drive control unit driving the trip driving unit by being driven by an overlapped power supply of a leakage current detected by the leakage current sensing unit and a DC power supply (DC voltage or current) output from the DC power generation unit.

And a boosting unit boosting the output power of the leakage current sensing unit and applying the boosted output power to the drive control unit.

And a filtering unit included in the output power source of the leakage current sensing unit.

And a temperature compensator for changing the output power of the DC power generator according to a change of the operation power according to the temperature of the drive control unit.

And the drive control unit includes a silicon controlled rectifier (SCR) that receives the superposed power of the output power of the leakage current sensing unit and the output power of the DC power generation unit to the gate terminal and is turned on,

The drive control unit

A low power silicon controlled rectifier which is turned on by receiving the superposed power of the output power of the leakage current sensing unit and the output power of the direct current power generation unit to the gate terminal,

And a large power silicon controlled rectifier which receives the low power control rectifier output power from the gate terminal and turns on to output power of the power line to drive the trip driving unit.

A full-wave rectification section for full-wave rectifying the power source of the power source line and supplying it to the DC power source generation section;

And a half wave rectifying unit for half-wave rectifying the power source of the power source while driving the driving control unit to supply driving power to the trip driving unit.

And a delay unit connected to a gate terminal of the drive control unit to which the superimposed power is input so that the leakage current detected by the leakage current detection unit is accumulated to a predetermined amount or more to drive the drive control unit.

And an overvoltage protection unit for driving the drive control unit when an overvoltage is applied to the power supply line.

The power supply overlap controller of the present invention having the above-described structure is excellent in the leakage current sensitivity, so that even if the output voltage of the leakage current detector is as low as 0.25 V to 0.35 V, the switching element of the drive controller can be turned on, Lt; RTI ID = 0.0 > 15mA, < / RTI &

When the ambient temperature is changed according to the temperature characteristic of the switching element of the driving control unit, the voltage input to the gate terminal of the switching element is controlled by the voltage so that the power line is opened when a leakage exceeding the set reference value occurs irrespective of the ambient temperature

It is a power overload control device for an earth leakage breaker, which is very useful for industrial development due to its excellent reliability and economical efficiency.

In addition, it is a power supply overlap control device of an earth leakage breaker which can be fabricated not only as a chip on board (COB) type on a substrate, but also as a semiconductor integrated circuit (IC) chip type, with a simple circuit configuration.

Fig. 1 is a circuit diagram of a control device of a circuit breaker according to the prior art; Fig.
2 is a circuit diagram of a power supply overlap control apparatus for an earth leakage breaker according to the present invention.
3 is an explanatory view of the overlapping operation of the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the appended drawings illustrate only the contents and scope of technology of the present invention, and the technical scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the technical idea of the present invention based on these examples.

Fig. 2 is a basic circuit diagram of a power supply overlap control apparatus for an earth leakage breaker according to an embodiment of the present invention . Fig. 2 ( a) is a circuit diagram for superimposing current. Fig. 2 ( b) is a circuit diagram for superposing a voltage.

The basic configuration of the earth leakage breaker according to the present invention includes a leakage current detection unit 250 for detecting a leakage current generated in a power line such as a conventional earth leakage breaker and a leakage current detection unit 250 for detecting leakage of current in the leakage current detection unit 250 The first and second filter units 260 and 290, the voltage boosting unit 270, the rectifying unit 220, the DC power generating unit 230, and the overlapping driving unit 210, A current setting unit 240, an overlap voltage setting unit 240-1, a drive control unit 300, and the like.

The leakage current detector 250 mainly uses a zero-current transformer (ZCT), and a hall sensor may be used in addition to the video current transformer.

The configuration of the trip driving unit 210 includes a power trip switch SW and a trip coil TC. When power is applied to the trip coil TC, a magnetic force is generated and the trip switch SW is pulled to open the power lines L1 and L2.

The first filter 260 filters the noise included in the power source detected by the zero-current transformer ZCT as the leakage current detector 250. The first filter unit 260 includes a capacitor C3 connected in parallel to the video current transformer.

remind The boosting unit 270 2 In the current overlapping circuit diagram of Fig. The first filter portion And boosts the detected voltage of the video current transformer through the switch 260. 2 In the voltage superposed circuit diagram of Fig. The boosting unit 270  It may not be provided.

The configuration of the step-up unit 270 includes a Schottky barrier diode D1, a capacitor C1, and a resistor R4.

The Schottky barrier diode D1 can be replaced by a conventional common diode element.

Schottky Barrier Diode D1 is intended to supply current at the negative pulse to the BOOST terminal. That is, a negative pulse from the power source detected and output from the video current transformer is charged to the capacitor C1, and is discharged when a positive pulse is output, so that a negative pulse is superposed on the positive pulse to be boosted. In other words, the power source detected and output by the image deflector is amplified by about two times with a simple circuit configuration.

The resistor R4 controls the change of the temperature characteristic in the same manner as the SCR of the drive control section 300 by the combination characteristics of the Schottky barrier diode element D1 and the resistance element R4, So that the current value is constant.

In FIG. 2A, a resistor R1 connected to the output terminal of the boosting unit 270 stabilizes the power output from the boosting unit 270 and is inputted to the gate terminal of the drive control unit 300. In FIG. 2B, the resistor R1 is connected to the voltage according to the leakage current sensed by the zero-current transformer ZCT and the voltage generated by the DC power generator 230 and set by the superimposed voltage setting unit 240-1 So that the supplied voltage is stabilized and input to the gate terminal of the driving control unit 300.

The rectifying unit 220 full-wave rectifies the power flowing through the power lines L1 and L2 and supplies the rectified power to the DC power generating unit 230 and the driving control unit 300. [

The rectifying unit 220 uses bridge diodes D5, D6, D7 and D8. The two input terminals are connected to the power lines L1 and L2. The two output terminals are connected to the ground and the anode terminal of the SCR of the drive control unit 300, Lt; / RTI >

The DC power generator 230 generates a DC power from the output power of the rectifier 220 and supplies the DC power to the gate terminal of the SCR of the drive controller 300.

The configuration of the direct current (DC) power generator 230 includes a resistor R3 and a Zener diode DZ. The Zener diode DZ provides a constant voltage (i.e., a DC power source), and the resistor R3 protects the Zener diode DZ.

2 As a result, Of a zener diode (DZ) The cathode terminal (VDC terminal) and  The SCR (300) GATE  Between the terminals, As the setting unit 240  resistance( R2 ).

The resistor R2 Is connected to the DC power source In the generation unit 230  Generated SCR (300) GATE  And determines the magnitude of the direct current output to the terminal.

2 b, Of a zener diode (DZ) The cathode terminal (VDC terminal) and  The image transformer ( SCR) Ground side  The superimposed voltage The setting unit 240-1  .

The superimposed voltage The setting unit 240-1  resistance( R5 ) And a diode D1 ), And a diode ( D1)  The voltage that is applied to the video current transformer ( ZCT ) To the voltage in accordance with the leakage current detected in the voltage detection circuit. The diode D1 ), That is, the magnitude of the overlapping voltage, R5 ).

The resistor R5 ) Control range of the superimposed voltage is 0.1V to 0.5V as , SCR (300) Gate terminal To the threshold voltage  It is possible to superimpose the image transformer ( ZCT ) Is low and the output leakage current is low SCR (300) can be driven. That is, it is possible to realize a high-sensitivity leakage prevention.

Video Current Transformer ( ZCT ) And the leakage current detected in the overlapping current In the setting unit 240  The output currents are superimposed on each other, SCR of Gate terminal  input( 2 a), and a video current transformer ZCT ) And the voltage due to the leakage current detected by the overvoltage Set The voltage applied to the unit 240-1 overlaps the voltage applied to the driving control unit 300 SCR of Gate stage Input character ( 2 b).

At this time, the superimposed current or voltage is input to the gate terminal of the SCR 300 with the noise removed through the capacitor C4 which is the second filter 290.

The drive control unit 300 is a semiconductor device that is turned on when a leakage current is generated and applies a trip current to the trip driving unit 210. A switching (i.e., turn-on / turn-on enabled) Possible switching devices are SCR, triac, FET, IGBT and so on.

The present invention uses a SCR (silicon controlled rectifier) as a switching element of the drive control unit 300. The SCR has a small size, a fast response speed, a semi-permanent lifetime, It is suitable for use as a drive control unit.

The gate terminal of the silicon controlled rectifier (SCR) used in the drive control unit 300 receives the leakage current of the boosting unit and the DC power supply of the DC power generating unit, the cathode terminal is connected to the ground, Lt; / RTI >

When the current input to the gate terminal of the silicon controlled rectifier (SCR) exceeds a threshold current, the silicon control rectifier is turned on to cause a trip current to flow into the trip coil TC of the trip driving unit 210, And the power lines L1 and L2 are opened.

ideal 2 a and 2 As can be seen from the description of b, ZCT (Or a voltage corresponding to the leakage current) detected by the current detector Overlay By overlapping the key or DC voltage SCR (300) Gate terminal  By inputting, even if the leakage current is low SCR (300) Gate terminal  The input superimposed power (current or voltage) Turn on Threshold voltage  It is possible to cut off high sensitivity leakage.

Hereinafter, 2  A circuit diagram with additional functions added to the basic circuit diagram ( Degree 3) will be described. 3  The following circuit diagram 2 a " of Fig.

3 is a diagram for explaining the principle of turning off the power lines L1 and L2 by superimposing the DC current when a small leakage current is generated.

3 (A) shows a DC current generated by the DC power generator 230 and determined by the R2 resistor and input to the gate terminal of the silicon controlled rectifier (SCR), and FIG. 3 3C shows a leakage current detected by the zero-current transformer ZCT as the leakage current sensing unit and input to the gate terminal of the silicon controlled rectifier SCR through the resistor R1, (Synthesized) the DC current and the leakage current of the silicon controlled rectifier (SCR) and inputted to the gate terminal of the silicon controlled rectifier (SCR).

Since the threshold current at which the silicon controlled rectifier (SCR) is turned on is larger than the direct current output from the DC power generator 230, the leakage current is not operated (turned on) unless a leakage current is generated, The DC current and the leakage current overlap each other to drive (turn on) the SCR of the drive control unit 300.

For reference, in the prior art, the leakage current detected by the leakage current sensing unit is amplified sufficiently to drive the drive control unit by using an expensive amplification IC, or the number of turns of the coil of the leakage current sensing unit is increased, So that the leakage current itself is large. The former method has a disadvantage that the manufacturing cost is high and the latter method has a large volume. On the contrary, the present invention is cheap because the volume of the leakage current sensing part is small and a separate amplifying IC is not used.

On the other hand, a semiconductor device having a switching function has a temperature characteristic in which a driving power source (that is, a threshold current or a threshold voltage) to be turned on slightly varies with temperature.

SCR has a negative temperature characteristic. That is, when the ambient temperature is high, the operating voltage (threshold voltage) that is turned on is low.

Therefore, the current input to the gate terminal in accordance with the temperature characteristic of the SCR must be changed according to the temperature for the reliability of the leakage current blocking.

To this end, the present invention connects the DC power generator 230 with a temperature compensation unit DT.

The temperature compensating unit DT is composed of a plurality of temperature compensating diodes D0 to Dn which are connected in series to the anode terminals of the DC power generating unit 23 as shown in FIG. .

The temperature compensation diodes D0 to Dn have characteristics in which the voltage varies depending on the ambient temperature. That is, there is a negative characteristic that the voltage is lowered when the ambient temperature is high.

Therefore, when the ambient temperature is high, the voltage (the sum of the voltage of DZ and the voltage of DT) applied to the resistor R2 becomes low and the voltage (current) applied to the gate terminal of the SCR 300 becomes low. That is, as the operating voltage of the SCR is lowered due to the ambient temperature rise, the voltage applied to the gate terminal is lowered.

At this time, the reliability of the earth leakage breaker becomes high if the rate of change of the operating voltage according to the temperature as the temperature characteristic of the SCR and the rate of change of the voltage according to the temperature are the temperature characteristics of the temperature compensation diodes D0 to Dn. That is, if the leakage current is above the set value regardless of the ambient temperature, it is a highly reliable earth leakage breaker when the earth leakage breaker operates and the power is cut off.

Therefore, in order to match the temperature characteristics of the SCR with the temperature characteristics of the temperature compensating portion DT, the number of the temperature compensating diodes D0 to Dn is made to be sufficient as shown in FIG. 4B, The trimming fuses F0 to Fm are connected in parallel to each of the transistors D4 to Dn-1 so that the voltage applied to the temperature compensating unit DT can be arbitrarily adjusted.

That is, when the trimming fuses F0 to Fm are cut by the laser, the cut trimming fuses F0 to Fm are short-circuited and the temperature compensating diodes D4 to Dn-1 connected in parallel to the trimming fuses F0 to Fm The voltage becomes zero. Thus, the voltage applied to the temperature compensating portion DT can be adjusted by the number of the trimming fuses F0 to Fm to be cut by the laser.

When the switching element used in the driving control unit 300 has a positive temperature characteristic or a temperature characteristic of the SCR is to be finely adjusted, as shown in FIG. 4C,

The temperature compensation diodes DT_P may be connected in series to the output line of the DC power generator 230, that is, the output line of the Zener diode DZ.

FIG. 5 is a circuit diagram of the basic diagram of FIG.

5 differs from the circuit diagram of FIG. 2 in that the rectifier 220 is not in the line through which the trip current flows but the half-wave rectifier 340 enters the line through which the trip current flows and the drive controller 300 low- SCR 310, a large power SCR 330, and a delay unit 320.

First, the half-wave rectifying unit 340 half-wave rectifies the current flowing through the power lines L1 and L2 and is supplied to the driving power source of the trip driving unit 210. The rectifying unit 220 performs full wave rectification of the power source line, (230).

The full wave rectifier needs to supply the driving power to the trip coil TC as shown in FIG. 2 because the power source for driving the trip coil TC of the trip driving unit 210 requires large power. To D8), but the power diode is expensive and difficult to chip (IC). Therefore, the full-wave rectification unit 220 supplies power only to the DC power generation unit 230 so that a general diode can be used, and a separate diode 340 is used to supply driving power to the trip coil TC.

When the leakage current is detected, the low power SCR 310 is turned on. When the low power SCR 310 is turned on, the other high power SCR 330 is turned on. And the large power diode 330 supplies the driving power to the trip coil TC.

The diode 340, that is, the half-wave rectifying unit 340 connected in series to the cathode terminal of the large power SCR 330, is a large power device, and equipotential with the full wave rectifying unit 220 diode D7, ) Is a half-wave current device for high power which substantially makes the potential of the cathode terminal of the control circuit equal to the ground terminal (GND) of the control circuit.

Therefore, the ground voltage and the K (cathode) terminal of the large power SCR 330 maintain the same potential in practice.

In FIG. 5, the large power SCR 330 and the power diode 340 are large power devices for driving the trip coil TC, and the rest use low power devices for control.

When implemented as a semiconductor IC chip, only the low power control circuit area can be made into an IC chip, and the whole of the low power control circuit area and the large power control circuit area can be made into an IC chip.

The delay unit 320 is provided between the low power SCR 310 and the high power SCR 330 so that the leakage current detected by the leakage current sensing unit 250 must be accumulated over a predetermined amount, (330) is turned on.

In other words, the delay unit 320 determines the leakage current at the initial stage of turning on the power supply to the load or when the noise is introduced, so that the power supply lines L1 and L2 are prevented from being small.

The power source of the power source initially charged may be unstable and current leakage to the leakage current detection unit can be detected by the noise even if there is no current leakage. Thus, it is the delay unit 320 that the power is not cut off at this time.

6A, 6B, and 6C, even when a leakage current is detected by the leakage current sensing unit due to the input of an initial unstable power source, the voltage at the capacitor C5 of the delay unit 320 is lowered to the threshold voltage Voltage), the drive control unit 300 is turned on so as not to malfunction due to noise or at the initial stage of power-on.

FIG. 7A is a circuit diagram in which the overvoltage protection unit 350 is further added in FIG.

The overvoltage protection unit 350 includes a rectifying unit 220 of a bridge circuit that applies full-wave rectification of power to the power lines L1 and L2 when an overvoltage is applied to the power lines L1 and L2 regardless of leakage of current, Power SCR 330 which turns on when the overvoltage is output to turn on the drive power supply to the trip coil TC to protect it from the overvoltage.

7B is a voltage waveform diagram showing the relationship between the overvoltage protection SCR 350 and the trip coil TC power supply SCR 330. FIG.

8A, 8B, and 8C are circuit diagrams in which the circuit diagram of FIG. 7A is modified.

Referring to FIG. 8A, a zener diode DZ is omitted from the DC power generator 230.

The temperature compensating diodes D0 to Dn used in the temperature compensating unit DT have a constant voltage so that the DC power generating unit 230 can eliminate the Zener diode DZ.

In other words, the zener diode DZ has a constant voltage across both ends, so that the dc current outputted to the resistor R2 connected in parallel to the zener diode DZ is made constant. The temperature compensation diodes D0 to Dn are also connected to the voltage The zener diode DZ can be omitted when the temperature compensation diodes D0 to Dn are used.

Referring to FIG. 8A, the overvoltage protection unit 350 may use a zener diode ZD1 and two distribution resistors R7 and R8 instead of the SCR (see FIG. 7A). That is, when an overvoltage is applied to the power lines L1 and L2, the voltage applied to the resistor R7 by the two distribution resistors R7 and R8 is higher than the threshold voltage of the Zener diode ZD1, The voltage ZD1 is turned on and the voltage of the gate terminal of the large power SCR 330 rises and the large power SCR 330 is turned on to cut off the power line.

8A, a ground terminal may be connected between the cathode terminal of the large power SCR 330 and the diode of the half-wave rectifier 340.

The cathode terminal of the large power SCR 330 and the diode of the half-wave rectifying section 340 function as if they are connected to the ground even though the ground terminal is not separately connected, A virtual ground terminal is provided between the diodes of the rectifying unit 340, but a ground terminal can be separately connected for a more stable circuit configuration.

8 As shown in b, The rectifying section 340 (see FIG. 7A)  The diode may also be removed.

8 Looking at b, The leakage current detection unit 250  Video Current Transformer ( ZCT ) Is connected to the ground terminal of the bidirectional diode D25 , D26 Can be connected.

The bidirectional diode ( D25 , D26 ) Is a video current transformer ZCT The operation voltage of one terminal of the bidirectional diode D25 , D26 )of As much as the voltage across  Up, bidirectional diode ( D25 , D26) to control the temperature characteristic of the image deflector (that is, the change in the output voltage according to the ambient temperature) using the change in the voltage between both ends according to the ambient temperature.

8 c, The delay unit 320 On the output side  diode( D9 ) Are connected, SCR (330) Gate terminal  Input The delay unit 320  Output voltage to diode ( D9 )of As much as the voltage across  Can be strengthened.

While the present invention has been described in connection with what is presently considered to be the case, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, The present invention is not limited thereto.

210: Trip driver 220: Full wave rectifier
230: DC power generator 270:
300:

Claims (5)

A zero-phase current transformer (ZCT) for detecting a leakage current generated in a power line;
A trip driver for shutting off a power supply line when leakage current is detected by the leakage current detector;
A DC power generator for generating a DC power using a power source of a power line;
A drive control unit driven by an overlapped power supply of a leakage current detected by the leakage current sensing unit and a DC power generated by the DC power generation unit to drive the trip driving unit; And
A temperature compensating unit for changing an output power of the DC power generating unit according to a change of the operating power according to a temperature of the driving control unit;
And a control unit for controlling the power supply of the earth leakage breaker. The method according to claim 1,
And a boosting unit boosting the output power of the leakage current sensing unit and applying the boosted voltage to the drive control unit. The method according to claim 1,
Further comprising a filtering unit included in the output power source of the leakage current sensing unit. delete 4. The method according to any one of claims 1 to 3,
Wherein the drive control unit includes a silicon control rectifier (SCR) which receives the superposed power of the output power of the leakage current sensing unit and the output power of the DC power generation unit to the gate terminal and is turned on. Device.

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