KR102018852B1 - Circuit Breaker - Google Patents

Abstract

The present invention relates to a circuit breaker. The circuit breaker of the present invention performs both an instantaneous release caused by a sudden overcurrent from the load side and a short circuit release in a short circuit/power failure from the load side through a silicon controlled rectifier (SCR) operation in one printed circuit board (PCB) circuit comprising an instantaneous sensing unit and a zero phase current transformer (ZCT), thereby protecting loads which receive the power.

Description

Power Breaker {Circuit Breaker}

The present invention relates to a power cut-off device which cuts off the power supply to protect a load supplied with power, and performs a short-circuit trip due to a sudden overcurrent on a load side or a short circuit trip due to a short-circuit current due to a load-side short circuit / short.

Generally, a power cut-off device such as an earth leakage breaker is installed in distribution boards such as homes, shopping malls, factories, offices, department stores, and the like. The contact with the wires leading to the load is turned off so that the power supply to the internal load is cut off. In general, an earth leakage breaker includes a ZCT (Zero Phase Current Transformer) having a ring structure on a PCB. The ZCT detects this when the test current is applied or when the load-side short-circuit current is generated and causes the trip device to operate so that the power supply to the internal load is cut off by disconnecting the connection between the lead terminal of the power supply line and the load terminal connected to the internal load. .

In addition, in general, a distribution board and the like are provided with a device for instantaneous trip with an earth leakage breaker to detect a sudden overcurrent on the load side so that instantaneous interruption is made.

Therefore, there is a cost problem and troublesome to separately purchase and install such a conventional earth leakage breaker and instantaneous trip device.

As related related documents, Patent Registration No. 10-0992838 (Nov. 11, 2010) and the like can be referred to.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention, SCR (Silicon Controlled) in a single printed circuit board (PCB) circuit including an instantaneous sensing unit and a zero phase current transformer (ZCT) It is to provide a power cut-off device that can protect the power supply load by performing both instantaneous trips due to sudden overcurrent on the load side and leakage currents due to leakage current during load side short-circuit / short circuit through driving.

First, to summarize the features of the present invention, a power cut-off device according to one aspect of the present invention for achieving the above object, and the connection of each of the two power lines connecting between two incoming terminals and two load terminals; A switch unit for opening; A ZCT sensing current flowing through the two power lines passing through the ring structure between the switch unit and the load terminal; A solenoid coil connected between a first power line and a control circuit unit among the two power lines between the ZCT and the load terminal; And an instantaneous sensing unit and a connection unit connected between the two power lines between the lead terminal and the switch unit and the control circuit unit, wherein the control circuit unit is configured to include a first one of the two power lines between the ZCT and the load terminal. Connected to two power lines, according to the instantaneous current flow through the instantaneous sensing unit and the connecting unit or an electrical signal between the two terminals of the ZCT, driving the SCR and the solenoid coil to operate the switch unit for an instant trip or Control the short circuit trip.

For the instantaneous trip or short circuit trip, the control circuit unit turns on the SCR to induce the magnetic field generation of the solenoid coil to generate a drive signal for turning off each switch of the switch unit.

The pulling or restoring state of each of the two springs of the instantaneous detection unit according to the current state of the two power lines, the connection or opening between the two power lines and the connection is made, the connection portion is the two springs Any one or more of the pulled state is connected to the control circuit portion to cause a current flow through the spring, the control circuit portion performs the instantaneous trip according to the current flow in the pulled state of the spring.

The power cut-off device further includes respective varistors connected between the front and rear ends of the solenoid coil and the second power line.

The connection part includes a first resistor, a forward diode, and a second resistor connected in series between respective other ends of the two springs, each of which is connected or opened to the two power lines, and the forward output terminal of the diode is the control circuit part. Is connected to.

The power cut-off device cuts off the power to the load terminal by the instantaneous trip for shutting off the power to the load terminal by the trip driving according to the overcurrent on the load side and by the trip drive according to the overcurrent due to the short-circuit or short circuit on the load side. Characterized in that for implementing the short-circuit trip for, in one circuit configuration.

The control circuit unit may include: an amplifier configured to generate an amplified driving signal in response to an electrical signal between two terminals of the ZCT and the current flowing in the pulled state through the connection unit; And the SCR which is turned on by receiving the amplified driving signal through a gate terminal, and induces the magnetic field generation by current flow in the solenoid coil by the turn-on current of the SCR.

The amplifier may be formed of one integrated circuit chip.

The power disconnect device, one end of a separate electric wire cable penetrating the ring structure of the ZCT between the switch unit and the load terminal, is connected to one side of the two power lines, and connected in series to the other end of the electric wire cable An end of the resistor and the test button may further include a test circuit unit connected to the other side of the two power lines.

According to an exemplary embodiment of the present invention, a power cutoff device may include an instantaneous trip due to a sudden overcurrent on a load side by driving a silicon controlled rectifier (SCR) in a single printed circuit board (PCB) circuit including an instantaneous detector and a zero phase current transformer (ZCT). It is possible to protect the load supplied with power by performing all of the leakage trips according to the leakage current at the load leakage / short circuit.

Generally, a separate instantaneous or short circuit countermeasure device is used on each power inlet line as a measure for instantaneous or short circuit of a hot line or a neutral line, which is an incoming power line. By using only one ZCT and one SCR, it adds only instantaneous detection function without additional device to cut off the power of load stage by shutting off power in case of sudden over current or short circuit / short circuit for each power line. Can be protected.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide examples of the present invention and together with the description, describe the technical idea of the present invention.
1 is a view for explaining a circuit of a power cut device according to an embodiment of the present invention.
2 illustrates a specific circuit of the control circuit of FIG. 1.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention. In this case, the same components in each drawing are represented by the same reference numerals as much as possible. In addition, detailed descriptions of already known functions and / or configurations are omitted. The following description focuses on parts necessary for understanding the operation according to various embodiments, and descriptions of elements that may obscure the gist of the description are omitted. In addition, some components of the drawings may be exaggerated, omitted, or schematically illustrated. The size of each component does not entirely reflect the actual size, and thus the contents described herein are not limited by the relative size or spacing of the components drawn in the respective drawings.

In describing the embodiments of the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification. The terminology used in the description is for the purpose of describing particular embodiments only and should not be limiting. Unless expressly used otherwise, the singular forms “a,” “an,” and “the” include plural forms of meaning. In this description, expressions such as "comprises" or "equipment" are intended to indicate certain features, numbers, steps, actions, elements, portions or combinations thereof, and one or more than those described. It should not be construed to exclude the presence or possibility of other features, numbers, steps, actions, elements, portions or combinations thereof.

In addition, terms such as first and second may be used to describe various components, but the components are not limited by the terms, and the terms are used to distinguish one component from another component. Only used as

1 is a diagram illustrating a circuit of a power cut device 100 according to an embodiment of the present invention.

Referring to FIG. 1, the power cutoff device 100 according to an embodiment of the present invention may be configured with one PCB circuit. Here, the configuration of one PCB circuit means that each component is mounted on the PCB once and implemented, and may include a structure in which each component is distributed and connected to a plurality of PCBs.

The power cut-off device 100 includes a plurality of load terminals in which each of the plurality of inflow terminals 11 and 12 (for example, two) into which power is supplied is turned on (connected) of each switch of the switch unit 221. (31, 32) (e.g., two) and terminals corresponding to each other can be connected to supply power to the load, and each switch of the switch unit 221 in the case of a short-circuit current due to a load-side overcurrent and Through the turn-off (opening) driving, both an instantaneous trip and a short circuit trip for a short circuit / short circuit can be performed. Here, although the inlet terminals 11 and 12 and the load terminals 31 and 32 are illustrated as two (eg, hot lines and neutral lines), respectively, in some cases, it is possible to supply power such as three-phase, three-wire and four-wire systems. In this case, it may be applied to any two lines of three or four (for example, a hot line and a neutral line N such as three-phase R, S, and T).

To this end, the power cutoff device 100 according to an embodiment of the present invention, the power cut-off unit 210, the instantaneous detection unit 230, including the ZCT 210, the switch unit 221 and the solenoid coil 222 ), The connection unit 240, and the control circuit unit 250.

The power cut-off device 100 may be installed and used in a distribution board such as a home, a shopping mall, a factory, an office, a department store, and the like, and trip driving according to an overcurrent on the load side subsequent to the load terminals 31 and 32 (pure seat driving) ZCT 210 to cut off the power to the load terminals 31 and 32 by means of the power supply and to cut off the power to the load terminals 31 and 32 by the trip driving (leakage trip drive) according to the leakage current by the short circuit or short circuit on the load side. Operation of each switch of the switch unit 221 by driving a trip device (e.g., operation of a crossbar, a latch, etc.) (not shown) using a magnetic field generated by the solenoid coil 222 according to the current sensing result of Each contact between the incoming terminals 11 and 12 and the load terminals 31 and 32 is interrupted by allowing the contact to be spaced apart from each corresponding fixed contact (to be in a non-contact state between the movable contact and the fixed contact).

The ZCT 210 senses a current flowing through two power lines (eg, a hot line and a neutral line) penetrating through the ring structure between the switch unit 221 and the load terminal 30, thereby providing two terminals P1 and P2. Generates an electrical signal corresponding thereto. Two terminals P1 and P2 of the ZCT 210 are connected to the control circuit unit 250.

One end of a separate wire cable, which penetrates the ring structure of the ZCT 210, is connected to one of two power lines, and the other end of the resistor R1 and the test button 40 connected in series are two power lines. The test circuit can be implemented by connecting to the other side. That is, when the test button 40 is pressed, it is recognized as a leakage current by the current flowing through the separate circuit and generates a magnetic field in the solenoid coil 222 in the control circuit unit, thereby operating trip devices (eg, crossbars, latches, etc.). (Not shown), so that the movable contact of each switch of the switch unit 221 is spaced apart from the respective fixed contact (so that the movable contact and the fixed contact are in a non-contact state), the incoming terminals 11 and 12 And each connection between the load terminals 31 and 32 may be blocked.

The solenoid coil 222 is connected between the first power line (eg, hot line) and the control circuit unit 250 among two power lines between the ZCT 210 and the load terminal 30. The terminal to which the solenoid coil 222 is connected to the control circuit 250 is P3.

Among the two power lines between the ZCT 210 and the load terminal 30, a second power line (eg, a neutral wire) is connected to the control circuit unit 250 through the terminal P6, and the front and rear ends of the solenoid coil 222 Varistors V1 and V2 are connected between two power lines (eg, neutral wires). The varistors V1 and V2 connected between the two wires through which the overcurrent flows through the ZCT 210 have high capacitance and may protect the circuit from instantaneous conductive surges.

The instantaneous detection unit 230 and the connection unit 240 are connected between the two power lines 11 and 12 between the lead terminal 10 and the switch unit 221 and the control circuit unit 250.

The instantaneous detection unit 230 includes two springs 231 and 232. The two springs 231 and 232 are connected or opened to one end of each of the two power lines 11 and 12 according to the current state of each of the two power lines 11 and 12. For example, each of the two springs 231 and 232 may be pulled to each of the two power lines 11 and 12 by an electromagnetic force when an overcurrent occurs in each of the two power lines 11 and 12 and connected to the connection portion 240. To be connected. When the overcurrent is removed, each of the two springs 231 and 232 is restored to its original state, and the connection part 240 is brought into the open state with the four power lines 11 and 12. In order to generate the electromagnetic force for pulling the two springs (231, 232), a predetermined magnet (magnet) for generating the electromagnetic force in accordance with the current flow can be used.

The connection part 240 is the first resistor R2 connected in series between the other ends T and R of the two springs 231 and 232 connected or opened to the two power lines 11 and 12, respectively, in the forward direction. The diode D1 and the second resistor R3 are included. The forward output terminal of the diode D1 is connected to the control circuit 250 through the P4 terminal. In accordance with the operation of the two springs (231, 232), in addition to the unipolar test of the neutral wire (N) and hot line (H), each of the corresponding current is sensed flow to the control circuit unit 250 through the connection 240, Power can be cut off. The diode D1 prevents the microcurrent flowing from the neutral line N to the hotline H in the anode test, thereby reducing the power off time. The positive test is to test the overcurrent by connecting the load to the load terminal 30, and the current flows from the hotline (H) to the neutral line (N) across the load, where both springs (231, 232) operate. It can be pulled out, but it is possible to cut off the power by detecting the current by the pulled state of the spring that is operating first.

That is, according to the current state of the two power lines 11 and 12, the two power lines 11 and 12 by the pulling state or the restoring state of each of the two springs 231 and 232 of the instantaneous detection unit 230. Connection or opening between the connection part 240 and the connection part 240, and the connection part 240 is connected to the control circuit part 250 according to a pulled state of at least one of the two springs 231 and 232 to flow current through the corresponding spring. Will be raised.

The control circuit 250 is located between the two terminals P1 and P2 of the ZCT 210, the forward output terminal P4 of the diode D1, the ZCT 210 and the load terminal 30 in FIG. 1. The P6 terminal connected to the second power line among the two power lines 31 and 32 receives a signal or current / voltage necessary for control.

In response to the signal or the current / voltage, the control circuit unit 250 applies a corresponding current through the connection unit 240 in a pulled state of one or more of the two springs 231 and 232 of the instantaneous detection unit 230. According to the flow or the electrical signal between the two terminals P1 and P2 of the ZCT 210, the SCR (see Q1 in FIG. 2) is turned on to induce the generation of the magnetic field of the solenoid coil 222 and thus the For turning off each switch, a drive signal is generated to operate the trip device as described above.

Generally, a separate instantaneous or short circuit countermeasure device is used on each power inlet line as an instantaneous or short circuit countermeasure for hot (H, HOT) lines or neutral (N, NEUTRAL) lines, which are incoming power lines. The device 100 adds only a function for instantaneous trip by the instantaneous detection unit 231 and the connection unit 240 without adding a separate device by using one ZCT 210 and one SCR (Q1) for short circuit leakage. For each power line, the power is cut off against sudden overcurrent or short-circuit or short-circuit during instantaneous protection to completely protect the load at the load end.

2 illustrates a specific circuit of the control circuit 250 of FIG. 1.

2, in addition to the SCR Q1 and the amplifier 290, the control circuit unit 250 includes surge protection bidirectional zener diodes D11 and D12 and resistors R11 to R16 for proper operation thereof. And capacitors C1, C2, C7, C8.

The amplifier 290 is an electrical signal between the two terminals (P1, P2) of the ZCT 210 and the current flow in the pulled state of the springs (231, 232) through the connecting portion 240 (current flow at P4) In response, an amplified drive signal is generated, and the amplified drive signal is provided to the gate terminal of the SCR Q1 through the A5 terminal. The amplifier 290 may be implemented by including an operational amplifier, a buffer, a transistor, or the like, and may be formed of one integrated circuit (IC) chip.

SCR Q1 receives the amplified drive signal through a gate terminal and is turned on to generate a high turn-on current between anode terminal P3 and cathode terminal P6.

The turn-on current of the SCR Q1 may induce magnetic field generation with high current flow through the solenoid coil 222. The magnetic field generation induced in the solenoid coil 222 generates a drive signal for operating the above trip device (eg, operation of a crossbar, a latch, etc.) for turning off each switch of the switch unit 221.

Resistors R11 connected in relation to the two output terminals P1 and P2 of the ZCT 210, the terminal P4 of the connection unit 240 and the three input terminals A1, A2 and A3 of the amplifier 290. , R12, R13, and R14 are selected and provided with appropriate values for sensitivity adjustment, and the capacitors C7 and C8 are selected and provided with appropriate values to remove noise.

Resistors R15 and R16 and capacitors connected with respect to the gate terminal of the SCR Q1, the anode terminal P3, the cathode terminal P6, and the output terminals A4, A5 and A6 of the amplifier 290. (C1, C2) are selected and provided as an appropriate value, it is used to control the noise removal or the response time of the power-off operation as described above.

As described above, the power cut-off device 100 according to the present invention, the instantaneous trip according to the load-side overcurrent through the SCR (Q1) driving in one PCB circuit including the instantaneous detection unit 230 and the ZCT 210 It is possible to protect the load supplied with power by performing all of the leakage trips according to the leakage current at the load leakage / short circuit.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations may be made without departing from the essential features of the present invention. Accordingly, the spirit of the present invention should not be limited to the described embodiments, and all technical ideas having equivalent or equivalent modifications to the claims as well as the following claims are included in the scope of the present invention. Should be interpreted as.

ZCT (210)
Switch section (221)
Solenoid Coil (222)
Power breaker 210
Instantaneous detection unit 230
Connection (240)
Control circuit unit 250

Claims (9)

A switch unit for connecting and opening each of two power lines connecting between two lead terminals and two load terminals; A ZCT sensing current flowing through the two power lines passing through the ring structure between the switch unit and the load terminal; A solenoid coil connected between a first power line and a control circuit unit among the two power lines between the ZCT and the load terminal; And an instantaneous detection part and a connection part connected between the two power lines and the control circuit part between the lead terminal and the switch part.
The control circuit unit is connected to a second power line of the two power lines between the ZCT and the load terminal, and the electric current flows through the instantaneous sensing unit and the connecting unit in an instant, or between the two terminals of the ZCT. According to the signal, by driving the SCR and the solenoid coil to operate the switch to control the instantaneous trip or short circuit trip,
The connection part includes a first resistor, a forward diode, and a second resistor connected in series between respective other ends of the two springs of the instantaneous detection part, each of which is connected or opened to the two power lines, and the forward output terminal of the diode Connected to the control circuit,
Connection or opening of the two power lines and the connecting portion is performed by the pulling state or the restoring state of each of the two springs according to the current state in the two power lines, and the connecting portion is any one of the two springs. The power supply unit is connected to the control circuit unit according to the pulled state to generate a current flow through the spring, and the control circuit unit performs the instantaneous trip according to the current flow in the pulled state of the corresponding spring. Blocking device. The method of claim 1,
For the instantaneous trip or short circuit trip, the control circuit unit turns on the SCR to induce magnetic field generation of the solenoid coil to generate a drive signal for turning off each switch of the switch unit. . delete The method of claim 1,
The power cut device,
And a varistor connected between the front and rear ends of the solenoid coil and the second power line. delete The method of claim 1,
The power cut device,
The instantaneous trip for shutting off the power to the load terminal by trip driving according to the overcurrent on the load side, and the ground fault trip for shutting off the power to the load terminal by trip driving according to the leakage current due to short circuit or short circuit on the load side. Power supply device, characterized in that for implementing in one circuit configuration. The method of claim 1,
The control circuit unit,
An amplifier for generating an amplified drive signal in response to an electrical signal between two terminals of the ZCT and the current flow in the pulled state through the connection portion; And
The SCR is turned on to receive the amplified drive signal through a gate terminal.
And a magnetic field generation induced by the flow of current through the solenoid coil by the turn-on current of the SCR. The method of claim 7, wherein
The amplification unit is a power cut off device, characterized in that consisting of one integrated circuit chip. The method of claim 1,
The power cut device,
One end of a separate wire cable penetrating the ring structure of the ZCT between the switch unit and the load terminal is connected to one side of the two power lines, the end of the resistance button and the test button connected in series to the other end of the wire cable A test circuit unit connected to the other of the two power lines
Power off device further comprising a.

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