Ground-fault circuit interrupter

Abstract

To provide a ground-fault circuit interrupter capable of reducing board space while requiring no light light-emitting element of the optical isolation means.SOLUTION: A ground-fault circuit interrupter 100 includes: a single-phase full-wave rectification circuit 10 connected to an AC line; a diode 12b in which the anode is connected to the positive output of the single-phase full-wave rectification circuit 10; a capacitor 12d connected to the cathode of the diode 12b; a pulse generation circuit 13b that generates a pulse synchronized with the voltage on the anode side of diode 12b; and an outgoing circuit 13c that generates a test current that is synchronized with the output pulse of the pulse generation circuit 13b and is used to test the soundness of the earth leakage detection circuit 7.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a leakage circuit breaker for detecting a leakage current flowing through an alternating current circuit such as a power distribution system, interrupting the alternating current circuit, and preventing a leakage accident in advance.

Background Art

[0002] A conventional leakage circuit breaker includes a main circuit connected to an alternating current circuit, a switching unit including a switching mechanism for opening and closing the main circuit, a leakage current detection circuit for detecting a leakage current flowing through the main circuit, and a tripping device for tripping the switching mechanism of the switching unit to interrupt the main circuit when the leakage current detection circuit detects a leakage current, and a test circuit for flowing a test current through the leakage current detection circuit to confirm the operation of the leakage tripping function.

[0003] A conventional general leakage circuit breaker obtains an operating power supply for the leakage current detection circuit and the tripping device from the two-phase circuits of the main circuit. A conventional general leakage circuit breaker also obtains an operating power supply for the test circuit from the main circuit, and flows a test current, which is suppressed to a value determined in advance by a resistor based on the operating power supply, through the test circuit (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The conventional leakage circuit breaker disclosed in Patent Document 1 has a light-emitting element arranged on the primary side and a light-receiving element arranged on the secondary side. The light-emitting element is inserted between the AC circuit and the rectifier circuit, and the light-receiving element is connected to a current-limiting element that limits the pseudo-leakage current flowing through the test winding. Thereby, the conventional leakage circuit breaker disclosed in Patent Document 1 generates a test current synchronized with the AC waveform. Since the light-emitting element of the optical insulation means is more susceptible to the influence of aging deterioration than other electronic components, it is necessary to consider its lifespan. In addition, the conventional leakage circuit breaker has a problem that a board space including an insulation distance must be secured to connect the primary side of the rectifier circuit and the stepped-down secondary side.

[0006] The present disclosure has been made in view of the above, and an object thereof is to obtain a leakage circuit breaker that eliminates the need for the light-emitting element of the optical insulation means and can reduce the board space.

Means for Solving the Problems

[0007] In order to solve the above-described problems and achieve the object, the leakage circuit breaker according to the present disclosure includes a rectifier circuit connected to an AC circuit, a diode whose anode is connected to the output positive side of the rectifier circuit, a capacitor connected to the cathode of the diode, a pulse generation circuit that generates a pulse synchronized with the voltage on the anode side of the diode, and a test current generation circuit that generates a test current for testing the soundness of the leakage detection circuit and is synchronized with the output pulse of the pulse generation circuit.

Advantages of the Invention

[0008] The leakage circuit breaker according to the present disclosure has an effect that it is possible to eliminate the need for the light-emitting element of the optical insulation means and reduce the board space.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0010] Hereinafter, the leakage circuit breaker according to the embodiment will be described in detail with reference to the drawings.

[0011] Embodiment FIG. 1 is a circuit diagram of a leakage circuit breaker 100 according to the embodiment. The leakage circuit breaker 100 has a power supply side connection terminal 1, a load side connection terminal 2, and a main circuit 3 connecting the power supply side connection terminal 1 and the load side connection terminal 2. The main circuit 3 has three circuits of R phase, S phase, and T phase. The circuits are conductors. The leakage circuit breaker 100 further has an opening and closing mechanism unit 4 and an opening and closing contact 5 for opening and closing the main circuit 3. The opening and closing contact 5 is driven by the opening and closing mechanism unit 4.

[0012] The leakage circuit breaker 100 further has a zero-phase current transformer 6 through which all-phase circuits in the main circuit 3 pass. The zero-phase current transformer 6 has a secondary winding 6a for detecting the leakage current flowing through the main circuit 3 and a tertiary winding 6b for performing a test of leakage detection. The leakage current includes the ground fault accident current. The leakage circuit breaker 100 further has a leakage detection circuit 7 for monitoring the current signal of the secondary winding 6a of the zero-phase current transformer 6 to determine the presence or absence of leakage. Leakage includes ground fault.

[0013] The leakage circuit breaker 100 further includes a tripping device 8 that drives the opening / closing mechanism unit 4 by the output signal of the leakage detection circuit 7 when a leakage occurs, trips the opening / closing contact 5, and shuts off the main circuit 3, a first impedance element 9a connected to the R-phase circuit of the main circuit 3, and a second impedance element 9b connected to the T-phase circuit of the main circuit 3. Each of the first impedance element 9a and the second impedance element 9b is, for example, a resistor or an inductor.

[0014] The leakage circuit breaker 100 further includes a single-phase full-wave rectifier circuit 10 that converts the AC power supplied from the main circuit 3 via the first impedance element 9a and the second impedance element 9b into DC power. The leakage circuit breaker 100 further includes a voltage suppression element 11 connected to both ends of the DC side of the single-phase full-wave rectifier circuit 10, and a power supply circuit 12 that converts the DC power supplied from the single-phase full-wave rectifier circuit 10 into DC power with a voltage lower than the voltage of the DC power and supplies the operating power to the leakage detection circuit 7 and the tripping device 8. The leakage circuit breaker 100 further includes a leakage test circuit 13 and a test switch 14. The leakage test circuit 13 is driven when the test switch 14 is pressed and causes a pseudo-leakage current to flow through the tertiary winding 6b.

[0015] The leakage circuit breaker 100 is connected to a three-phase AC circuit to be detected for leakage by a power supply side connection terminal 1 and a load side connection terminal 2. The three-phase AC circuit is not shown.

[0016] The single-phase full-wave rectifier circuit 10 is composed of four rectifier diodes, rectifies the three-phase AC voltage supplied via the main circuit 3, and supplies DC power to the power supply circuit 12. The four rectifier diodes are not shown. The AC side of the single-phase full-wave rectifier circuit 10 is connected to the R-phase and T-phase circuits of the main circuit 3 via the first impedance element 9a and the second impedance element 9b.

[0017] The voltage suppression element 11 is connected in parallel to each of two sets, each set including two rectifier diodes that constitute the positive electrode side arm and the negative electrode side arm of each phase of the single-phase full-wave rectifier circuit 10. The voltage suppression element 11 suppresses the reverse voltage for all of these four rectifier diodes from overvoltages such as surges or impulses, and protects the entire circuit of the leakage circuit breaker 100 including the single-phase full-wave rectifier circuit 10. The voltage suppression element 11 is, for example, a Zener diode.

[0018] The power supply circuit 12 is supplied with the DC voltage VD full-wave rectified by the single-phase full-wave rectifier circuit 10, and has a first constant voltage circuit 12a that steps down the DC voltage VD to a predetermined first DC control voltage VS, and a diode 12b whose anode is connected to the first constant voltage circuit 12a. The first constant voltage circuit 12a is a step-down circuit connected to the single-phase full-wave rectifier circuit 10 and the diode 12b. The first DC control voltage VS is, for example, 40 V DC.

[0019] The power supply circuit 12 is supplied with DC power from the first constant voltage circuit 12a via the diode 12b, and further has a second constant voltage circuit 12c that steps down the first DC control voltage VS of the DC power to a second DC control voltage VC having a voltage lower than the first DC control voltage VS. The second DC control voltage VC is, for example, 5 V DC. The power supply circuit 12 is connected to the cathode of the diode 12b and the ground GND, and further has a capacitor 12d for smoothing the first DC control voltage VS.

[0020] Next, the details of the leakage test circuit 13 that performs the leakage test operation will be described. The leakage test circuit 13 includes a Zener diode 13a whose cathode is connected to the anode of the diode 12b of the power supply circuit 12, a pulse generation circuit 13b that is connected between the anode of the Zener diode 13a and the ground GND and is driven when the test switch 14 is pressed, and a transmission circuit 13c that is connected between the cathode of the Zener diode 13a and the ground GND and flows a pseudo-leakage current through the tertiary winding 6b of the zero-phase current transformer 6 based on the pulse from the pulse generation circuit 13b. The transmission circuit 13c is, for example, an H-bridge circuit that generates a test current by a switching operation from the first DC control voltage VS stepped down by the power supply circuit 12.

[0021] The leakage test operation is an operation that pseudo-generates leakage by flowing a pseudo-leakage current through the tertiary winding 6b of the zero-phase current transformer 6, and causes the leakage detection circuit 7 to detect the leakage and trip the leakage. For example, when the sensitivity current of the leakage breaker 100 is 500 mA and the tertiary winding 6b is a 100-turn winding, since it is necessary to flow a current about twice as much, the pseudo-leakage current is 500 (mA) × 2 (times) / 100 (turns) = 10 mA, and it is necessary to set the value of the pseudo-leakage current to a current value of about 10 mA.

[0022] FIG. 2 is a circuit diagram showing details of a pulse generation circuit 13b included in a leakage test circuit 13 of a leakage circuit breaker 100 according to an embodiment. The pulse generation circuit 13b includes a transistor 13b1, and has a resistor 13b2, a resistor 13b3, and a resistor 13b4 at its anode. The base of the transistor 13b1 is connected to the anode of a Zener diode 13a via the resistor 13b2, and the collector of the transistor 13b1 is connected to a transmission circuit 13c. FIG. 2 also shows the Zener diode 13a included in the leakage test circuit 13. The resistor 13b3 is connected between the base and the emitter of the transistor 13b1. One end of the resistor 13b3 that is connected to the emitter of the transistor 13b1 is also connected to the ground GND. One end of the resistor 13b4 is connected to a test switch 14, and the other end of the resistor 13b4 is connected to the collector of the transistor 13b1.

[0023] FIG. 3 is a circuit diagram showing details of a transmission circuit 13c included in a leakage test circuit 13 of a leakage circuit breaker 100 according to an embodiment. The transmission circuit 13c includes a transistor 13c1 whose emitter is connected to the anode of a diode 12b and whose collector is connected to one end of a tertiary winding 6b, a transistor 13c2 whose emitter is connected to the anode of the diode 12b and whose collector is connected to the other end of the tertiary winding 6b, a resistor 13c3 connected between the base and the emitter of the transistor 13c1, and a resistor 13c4 connected between the base and the emitter of the transistor 13c2.

[0024] The transmission circuit 13c further includes a resistor 13c5 connected between the base of the transistor 13c1 and the collector of the transistor 13c2, a resistor 13c6 connected between the base of the transistor 13c2 and the collector of the transistor 13c1, a transistor 13c7 whose collector is connected to the other end of the tertiary winding 6b and whose emitter is connected to the ground GND, and a transistor 13c8 whose collector is connected to one end of the tertiary winding 6b and whose emitter is connected to the ground GND.

[0025] The transmission circuit 13c further includes a capacitor 13c9 having one end connected to the base of the transistor 13c7 and the other end connected to the collector of the transistor 13b1, a capacitor 13c10 having one end connected to the base of the transistor 13c8 and the other end connected to the collector of the transistor 13b1, and a diode 13c11 having its cathode connected to the collector of the transistor 13c7. FIG. 3 also shows the transistor 13b1 and the resistor 13b2 of the pulse generation circuit 13b included in the leakage test circuit 13.

[0026] The transmission circuit 13c further includes a diode 13c12 having its cathode connected to the collector of the transistor 13c8, a resistor 13c13 having one end connected to the anode of the diode 13c11 and the other end connected to the test switch 14, a resistor 13c14 having one end connected to the anode of the diode 13c12 and the other end connected to the test switch 14, and a capacitor 13c15 having one end connected to the anode of the diode 13c12 and the other end connected to the base of the transistor 13c7.

[0027] The transmission circuit 13c further includes a capacitor 13c16 having one end connected to the anode of the diode 13c11 and the other end connected to the base of the transistor 13c8, a resistor 13c17 connected in parallel with the capacitor 13c15, a resistor 13c18 connected in parallel with the capacitor 13c16, and a resistor 13c19 having one end connected to the collector of the transistor 13c1 and the other end connected to one end of the tertiary winding 6b.

[0028] Next, the operation of the leakage test circuit 13 will be described. FIG. 4 is a first diagram for explaining the operation of the transmission circuit 13c included in the leakage test circuit 13 of the leakage circuit breaker 100 according to the embodiment. FIG. 4 shows the test current state on the positive side. FIG. 5 is a second diagram for explaining the operation of the transmission circuit 13c included in the leakage test circuit 13 of the leakage circuit breaker 100 according to the embodiment. FIG. 5 shows the test current state on the negative side. FIG. 6 is a diagram for explaining the operation of the leakage test circuit 13 of the leakage circuit breaker 100 according to the embodiment. FIG. 6 shows how each of the voltage of the test switch 14, the first DC control voltage VS, the output signal of the pulse generation circuit 13b, and the test current changes with the passage of time. The first DC control voltage VS is indicated by the phrase "voltage of VS".

[0029] When the power is turned on from the state where the power is off, that is, when the test switch 14 is pressed and the power is supplied from the second constant voltage circuit 12c to the pulse generation circuit 13b and the transmission circuit 13c, the capacitors 13c9 and 13c10 are charged via the resistors 13c13, 13c14, 13c17, 13c18, and the transistor 13c7 or the transistor 13c8 tries to turn on.

[0030] At this time, due to variations in the resistance values of the resistors 13c13, 13c14, 13c17, 13c18, the capacitances of the capacitors 13c9, 13c10, and the turn-on sensitivity of the transistors 13c7, 13c8, either the transistor 13c7 or the transistor 13c8 turns on first. When either the transistor 13c7 or the transistor 13c8 turns on first, the other turns off.

[0031] When the transistor 13c7 turns on and the transistor 13c8 turns off, current flows through the resistors 13c3, 13c5, so the transistor 13c1 turns on. Conversely, when the transistor 13c8 turns on and the transistor 13c7 turns off, current flows through the resistors 13c4, 13c6, so the transistor 13c2 turns on.

[0032] Next, as shown in FIG. 4, the operation will be described with the current state being such that transistor 13c7 and transistor 13c1 are on, and transistor 13c8 and transistor 13c2 are off, that is, a state where a positive test current is flowing through the tertiary winding 6b. The timing t1 in FIG. 6 is the timing of the state where a positive test current is flowing through the above-described tertiary winding 6b.

[0033] In the above state, as shown in FIG. 4, a current is supplied to the base of transistor 13c7 via resistor 13c17. Capacitor 13c9 is charged with the side of resistor 13c17 being positive and the side of transistor 13b1 being negative. Capacitor 13c15 is charged with the side of resistor 13c14 being positive and the side of capacitor 13c9 being negative. Capacitor 13c16 is charged with the side of resistor 13c13 being negative and the side of capacitor 13c10 being positive. Capacitor 13c10 is charged with the side of capacitor 13c16 being negative and the side of transistor 13b1 being positive. The current supplied from the first constant voltage circuit 12a flows in the order of transistor 13c1, tertiary winding 6b, and transistor 13c7.

[0034] When transistor 13c7 and transistor 13c1 are on and transistor 13c8 and transistor 13c2 are off, as shown at timing t2 in FIG. 6, when the first DC control voltage VS, which is the voltage on the cathode side of the Zener diode 13a, momentarily drops and then returns to its original value, the Zener diode 13a also becomes non-conductive momentarily and then becomes conductive.

[0035] When the Zener diode 13a becomes non-conductive, transistor 13b1 turns off, and then when the Zener diode 13a becomes conductive, transistor 13b1 turns on.

[0036] When transistor 13b1 changes from off to on, capacitor 13c9 has the side of resistor 13c17 charged positively, and no current flows through capacitor 13c9. However, since the side of resistor 13c18 of capacitor 13c10 is charged negatively, a current flows through capacitor 13c10 for only an instant.

[0037] As a result, as shown in FIG. 5, a current flows from the second constant voltage circuit 12c through resistors 13c13 and 13c18. Capacitor 13c10 has the side of resistor 13c18 charged positively and the side of transistor 13b1 charged negatively, and transistor 13c8 turns on.

[0038] When transistor 13c8 turns on, current flows in the order of resistor 13c17, diode 13c12, and transistor 13c8, and no current flows to the base of transistor 13c7, so transistor 13c7 turns off. At this time, capacitor 13c15 has the side of resistor 13c14 charged negatively and the side of capacitor 13c9 charged positively, and capacitor 13c9 has the side of resistor 13c17 charged negatively and the side of transistor 13b1 charged positively.

[0039] When transistor 13c7 turns off, no current flows through resistors 13c3 and 13c5, so transistor 13c1 turns off. Conversely, when transistor 13c8 turns on, current flows through resistors 13c4 and 13c6, so transistor 13c2 turns on.

[0040] As a result, transistors 13c7 and 13c1 turn off, and transistors 13c8 and 13c2 turn on. The current supplied from the first constant voltage circuit 12a flows in the order of transistor 13c2, tertiary winding 6b, and transistor 13c8 as shown at timing t3 in FIG. 6, and the current flowing through the tertiary winding 6b becomes a negative current in the reverse direction.

[0041] Next, as shown in FIG. 5, the operation will be described assuming that the transistor 13c7 and the transistor 13c1 are off, and the transistor 13c8 and the transistor 13c2 are on.

[0042] In this state, a current is supplied to the base of the transistor 13c8 via the resistor 13c18. The capacitor 13c10 is charged with the side of the resistor 13c18 being positive and the side of the transistor 13b1 being negative. The capacitor 13c16 is charged with the side of the resistor 13c13 being positive and the side of the capacitor 13c10 being negative. The capacitor 13c15 is charged with the side of the resistor 13c14 being negative and the side of the capacitor 13c9 being positive. The capacitor 13c9 is charged with the side of the capacitor 13c15 being negative and the side of the transistor 13b1 being positive. The current supplied from the first constant voltage circuit 12a flows in the order of the transistor 13c2, the tertiary winding 6b, and the transistor 13c8.

[0043] When the transistor 13c8 and the transistor 13c2 are on and the transistor 13c7 and the transistor 13c1 are off, as shown at the timing t4 in FIG. 6, the first DC control voltage VS, which is the voltage on the cathode side of the Zener diode 13a, momentarily drops, and then when the first DC control voltage VS returns to its original value, the Zener diode 13a also becomes non-conductive for a moment, and then the Zener diode 13a becomes conductive.

[0044] When the Zener diode 13a becomes non-conductive, the transistor 13b1 turns off, and then when the Zener diode 13a becomes conductive, the transistor 13b1 turns on.

[0045] When the transistor 13b1 changes from off to on, the capacitor 13c10 is charged with the side of the resistor 13c18 being positive, and no current flows through the capacitor 13c10, but since the capacitor 13c9 is charged with the side of the resistor 13c17 being negative, a current flows through the capacitor 13c9 for a moment.

[0046] As a result, as shown in FIG. 4, a current flows from the second constant voltage circuit 12c through the resistors 13c14 and 13c17, and the capacitor 13c9 is charged with the side of the resistor 13c17 being positive and the side of the transistor 13b1 being negative, turning on the transistor 13c7.

[0047] When the transistor 13c7 turns on, a current flows in the order of the resistor 13c18, the diode 13c11, and the transistor 13c7. Since no current flows to the base of the transistor 13c8, the transistor 13c8 turns off. At this time, the capacitor 13c16 has the side of the resistor 13c13 being negative and the side of the capacitor 13c10 being positive, and the capacitor 13c10 has the side of the resistor 13c18 being negative and the side of the transistor 13b1 being positive.

[0048] When the transistor 13c8 turns off, no current flows through the resistors 13c4 and 13c6, so the transistor 13c2 turns off. Conversely, when the transistor 13c7 turns on, current flows through the resistors 13c3 and 13c5, so the transistor 13c1 turns on.

[0049] As a result, the transistors 13c2 and 13c8 turn off, and the transistors 13c1 and 13c7 turn on. The current supplied from the first constant voltage circuit 12a flows in the order of the transistor 13c1, the tertiary winding 6b, and the transistor 13c7 as shown at the timing t5 in FIG. 6, and the current flowing through the tertiary winding 6b becomes a positive current in the reverse direction.

[0050] The leakage circuit breaker 100 according to the embodiment includes a single-phase full-wave rectifier circuit 10 connected to an AC power line, a diode 12b whose anode is connected to the positive output side of the single-phase full-wave rectifier circuit 10, a capacitor 12d connected to the cathode of the diode 12b, a pulse generation circuit 13b that generates a pulse synchronized with the voltage on the anode side of the diode 12b, and a transmission circuit 13c that is synchronized with the output pulse of the pulse generation circuit 13b and is a test current generation circuit that generates a test current for testing the soundness of the leakage detection circuit 7. Therefore, the leakage test circuit 13 can be configured only on the low-voltage side, it is easy to ensure the insulation distance, and thus the leakage circuit breaker 100 can be miniaturized. That is, the leakage circuit breaker 100 does not require a light-emitting element of the optical insulation means and can reduce the substrate space.

[0051] As described above, since the leakage test circuit 13 can be configured only on the low-voltage side, the number of components used in the leakage circuit breaker 100 can be suppressed, and thus the cost of the leakage circuit breaker 100 can be reduced.

[0052] The leakage circuit breaker 100 has a first constant voltage circuit 12a connected to the single-phase full-wave rectifier circuit 10 and the diode 12b. Since the pulse generation circuit 13b generates a pulse synchronized with the voltage on the output side of the first constant voltage circuit 12a, a highly reliable leakage test can be performed by using the leakage circuit breaker 100.

[0053] The pulse generation circuit 13b detects the timing when the voltage on the output side of the first constant voltage circuit 12a rises from the lower limit voltage and turns on the output pulse. Therefore, a pulse synchronized with the voltage on the output side of the first constant voltage circuit 12a can be generated, and a test current waveform that is easy for the leakage detection circuit 7 to detect can be generated.

[0054] The pulse generation circuit 13b detects the voltage on the output side of the first constant voltage circuit 12a by a Zener diode 13a and generates a pulse synchronized with the detected voltage. Therefore, the circuit of the leakage circuit breaker 100 can be configured at low cost.

[0055] The configurations shown in the above embodiments are merely examples, and it is possible to combine them with other known technologies, and it is also possible to omit or change a part of the configuration without departing from the gist.

Explanation of Signs

[0056] 1 Power supply side connection terminal, 2 Load side connection terminal, 3 Main circuit, 4 Opening and closing mechanism section, 5 Opening and closing contact, 6 Zero-phase current transformer, 6a Secondary winding, 6b Tertiary winding, 7 Leakage detection circuit, 8 Tripping device, 9a First impedance element, 9b Second impedance element, 10 Single-phase full-wave rectifier circuit, 11 Voltage suppression element, 12 Power supply circuit, 13 Leakage test circuit, 14 Test switch, 12a First constant voltage circuit, 12b, 13c11, 13c12 Diode, 12c Second constant voltage circuit, 12d, 13c9, 13c10, 13c15, 13c16 Capacitor, 13a Zener diode, 13b Pulse generation circuit, 13c Transmission circuit, 13b1, 13c1, 13c2, 13c7, 13c8 Transistor, 13b2, 13b3, 13b4, 13c3, 13c4, 13c5, 13c6, 13c13, 13c14, 13c17, 13c18, 13c19 Resistor, 100 Earth leakage circuit breaker.

Claims

1. A rectifier circuit connected to an AC circuit, A diode having an anode connected to the positive output side of the rectifier circuit, A capacitor connected to the cathode of the diode, A pulse generation circuit that generates a pulse synchronized with the voltage on the anode side of the diode, A test current generation circuit that is synchronized with the output pulse of the pulse generation circuit and generates a test current for testing the integrity of the leakage detection circuit A leakage circuit breaker characterized by comprising the above.

2. Further comprising a step-down circuit connected to the rectifier circuit and the diode, The pulse generation circuit generates a pulse synchronized with the voltage on the output side of the step-down circuit The leakage circuit breaker according to claim 1, characterized by the above.

3. The pulse generation circuit detects the timing at which the voltage on the output side of the step-down circuit rises from the lower limit voltage and turns on the output pulse The leakage circuit breaker according to claim 2, characterized by the above.

4. The pulse generation circuit detects the voltage on the output side of the step-down circuit by a Zener diode and generates a pulse synchronized with the voltage on the output side The leakage circuit breaker according to claim 3, characterized by the above.

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