KR20000064108A - Circuit breaker capable of electric trip and method of the same - Google Patents

Abstract

The present invention relates to a circuit breaker and an implementation method for detecting an arc fault, a ground fault or an overload in an electrical system and breaking the circuit.

The circuit breaker of the present invention is connected between a phase conductive line and a ground conductive line supplied with AC power to detect a ground fault, an arc defect detecting unit connected to the phase conductive line and the ground conductive line to detect an arc defect, The fault comparator is shared by the voltage comparator of the arc fault detector and connected to a phase conductive line and a ground conductor to detect an overload by capacitance, and whether or not a fault occurs according to an output signal of the arc fault detector, the ground fault detector, or the overload detector. The display unit for displaying the external to the outside, and a trip unit for shutting off the power supply of the circuit according to the output signal of the arc defect detector, ground fault detector or overload detector.

Description

CIRCUIT BREAKER CAPABLE OF ELECTRIC TRIP AND METHOD OF THE SAME}

The present invention relates to a circuit breaker and an implementation method for detecting and breaking an arc fault, an overload, and a ground fault in a power distribution system.

Switchboards in certain areas, such as urban, industrial or commercial areas, typically use low voltage networks of 600 volts or less. In particular, the cables of the network are buried underground and are generally designed to be introduced at more than one point. Such a cable may cause defects due to various causes such as thermal degradation, aging, moisture, or damage by animals such as mice or squirrels. A circuit breaker is provided to protect the network from the above causes. A device that can disconnect the cable, such as a fuse, is required at both ends of the cable to insulate the faulty cable and minimize the failure of the network. do. The cable disconnection device is a device capable of safely acting on phase-to-phase defects such as high voltage and low impedance defects.

Generally, wiring breakers and earth leakage breakers are used at home to prevent fire or electric shock. The circuit breaker is used for the purpose of protecting the electric wire. Firstly, when the current exceeds the rated value while the load is in use, the current flowing inside the breaker flows higher than the normal current. This occurs, and by this heat, the internal bimetal is bent to operate the breaker. The second is a case in which a short circuit occurs between phases by a power tool or other metal object on the load side. In this case, since a high current is generated instantaneously, the bimetal is heated to operate the internal magnet, and accordingly the breaker operates. do. Such a high current generates a lot of magnetic fields, and the magnet inside the electric appliance is operated accordingly.

In the case of the circuit breaker, the circuit breaker has a function of protecting the user by detecting a circuit and shutting off the power when the user is shocked while using the electric device.

In the United States, a Miniature Circuit Breaker is used for the switchboard and a Ground Fault Circuit Interrupter (GFCI) is used for the outlet where the user's hand directly contacts. The ground fault protection circuit breaker (GFCI) is a kind of ground fault breaker, has a high sensitivity ground fault detection function, and is mandatory to be used in places such as a kitchen, a bathroom, a parking lot, or a basement with a lot of moisture or moisture.

Despite the installation of circuit breakers and earth leakage breakers as described above, many fires occur worldwide every year, which causes arcing type faults to ground more frequently than the above phase faults. Because. These arc faults are low current and high impedance and cause the cable disconnect device to not respond to the fault because it generates a current with a root mean square (RMS) below the thermal threshold of the breaker, As a result, fires often occur.

Nevertheless, the arc fault is very dangerous because it occurs at high temperatures, which can only be detected by the ground fault protection circuit breaker (GFCI) if the arc fault generates a sufficient leakage current through the ground. In addition, since the breaker is operated when the current caused by the arc exceeds the thermal / magnetic structure parameter of the breaker, an arc fault protection circuit breaker (AFCI) capable of blocking the arc fault is required.

In particular, the Consumer Product Safety Commission (CPSC) determined that 40% of fires in 1997 were due to arc failure. Accordingly, the National Electric Code (NEC) mandated the use of the Arc Fault Circuit Interrupter (AFCI) in homes since January 2002.

The causes of arc defects vary greatly, for example, mechanical and electrical stress due to aging, insulation and wiring breakdown, overuse or overcurrent, connection defects, and excessive mechanical damage to insulation and wiring.

In general, it can be classified into three types of arc defects occurring in residential buildings or commercial buildings.

The first is a series arc (contact arc) that occurs between the conductor and the conductive line in series. The conductive wires constituting the cable are separated by an insulator and surrounded and insulated, and a portion of the upper conductive wire may be ruptured, resulting in a series gap. At this time, if an arc occurs, a lot of heat is generated locally in the cable, and if a heat continues to generate enough to rupture or carbonize the insulator adjacent to the arc generating point, a fire occurs. In the series arc as described above, the magnitude of the current flowing in the arc is controlled by the load.

Second is parallel arcs (line arcs) that occur between conductive lines. The conductive wire inside the cable is surrounded by an outer insulator and is insulated by the inner insulator. If the internal insulator is degraded or damaged, an arc defect occurs between the upper conductive line and the lower conductive line. Deterioration or damage to the internal insulation may be caused by carbonization by a lightening strike that affects the wiring system, such as exposure to excessive direct sunlight, or by a mechanical action where the cable extension cord portion is cut by pressing on furniture such as a chair. May occur.

Third is a ground arc that occurs between the conductive line and ground. A ground arc occurs when the insulator of a cable protecting the conductive wire, such as a parallel arc, is broken and the conductive wire is grounded through the broken portion.

In particular, since the parallel arc and the ground arc occur in parallel with the load, the current flowing in the arc is changed by the impedance of the power supply.

As described above, if the deterioration phenomenon of the cable lasts for a long time, the coating is damaged due to carbonization of the cable, and Joule heat is generated by the arc current, thereby further deteriorating the cable. At this time, the generated Joule heat J = (arc current) ² x time, and thus an arc due to carbonization of the cable is generated.

The biggest problem in detecting and blocking an arc fault is that the arc fault protection circuit breaker (AFCI) causes the malfunction of the arc fault protection circuit breaker (AFCI) to disconnect the wiring system from the power supply even when the arc fault does not actually occur. . This phenomenon occurs when arc current and arc voltage are not generally sinusoidal, and show various types of voltage and current waveforms depending on the type of arc. The arc voltage and arc current are electric motors such as electric fans or dryers. It is because it has the characteristic similar to the pulse which generate | occur | produces when starting various electrical apparatuses, such as household appliances which use.

In addition, the arc becomes more difficult to detect because the output voltage when an arc occurs and the pulse voltage generated when the electric device is started are similar.

In order to solve the above problem, a conventional Arc Fault Detector (AFD) for detecting an arc through multiple channels is disclosed in US Pat. No. 5,805,397. The patent is to detect an arc over a plurality of frequency bands, and to determine the occurrence of an arc in each frequency band to drive the circuit breaker.

1 shows a structural diagram of a blocking system using the conventional arc defect detection circuit, and FIG. 2 shows the conventional arc defect detection circuit diagram.

Referring to FIG. 1, a conventional blocking system 100 having a breaker 103 is connected to a line conductive line 105 and a neutral conductive line 107 to a load 109 to supply power. The breaker 103 has a flow switch 111 so that the spring can be opened by the trip means 101. The trip means 101 can be operated by conventional thermal-magnetic overcurrent devices. The thermally-magnetic overcurrent device includes a bimetal that is connected in series to the line conductive line 105. When the overcurrent is continuously applied, the bimetal is heated and curved, thereby releasing the latch 113 to drive the trip means 101. The current flowing through the bimetal moves the armature 114 magnetically to selectively release the latch 113 for the trip means 101 to operate.

In the conventional circuit breaker 103 described above, the arc defect detection circuit 120 will be described with reference to FIG. 1. The conventional arc detection circuit 120 is composed of a multichannel bandpass filter circuit 126 including a plurality of channels 123 and 124. Each channel 123, 124 is comprised of band pass filters 125, 126, such as a conventional active band pass filter, as shown in FIG. The band pass filters 125 and 126 form bands so that they do not overlap each other, so that each filter 125 and 126 generates an output signal according to an arc defect when an arc of a wide band occurs. On the other hand, since the driving signal is generated only at a specific frequency, the output signal is generated only at the filter corresponding to the frequency. Accordingly, the circuit breaker is operated by generating the arc detection signal when the output signal of each filter is summed to correspond to a predetermined arc generation level.

Unlike the arc detection circuit using the multi-channel as described above, an arc detection circuit for generating an arc detection signal by comparing an arc defect detection signal in a line with an arc defect detection signal in a load is disclosed in US Pat. No. 5,963,406. .

US Pat. No. 5,963,406 adds some circuitry to a general ground fault circuit breaker (GFCI) to detect arc faults and ground faults, and FIG. 3 shows a block diagram of the conventional arc fault detection circuit.

Referring to FIG. 3, the conventional arc defect detection circuit 180 includes an arc defect / ground defect detection circuit unit 182 for detecting arc defects and ground defects, and a line circuit unit 188 for detecting arc defects in a line. , An arc detection unit 198 for generating an arc detection signal by comparing an output signal of the line circuit unit 188 and the load circuit unit 200 to detect an arc defect in a load, and an arc defect circuit. A remote breaker 184 for controlling the on / off of the breaker AFCI and a timer circuit 186 for shutting off the arc fault detection function for a predetermined time.

However, the above-described arc defect detection circuit uses a conventional arc detection circuit as it is, and requires both arc detection in a line and arc detection in a load, so that the device is additionally provided in comparison with the improved arc defect detection performance. There is a disadvantage in that the increase in effort or cost according to the manufacturing increases.

In addition, an arc generation can be detected by comparing the output signals of the line portion and the load portion, and accordingly, the arc generation of the line portion and the load portion can be controlled independently, but an amplification filter for controlling the arc detection signal of the line portion Means for rectifying, and for amplifying, filtering, rectifying, etc. for controlling the arc detection signal of the load part separately, the cost of manufacturing the arc detection circuit increases, and the size of the breaker increases, There is a problem that makes it difficult to install.

In addition, circuit breakers as well as various electrical appliances are equipped with overload protection devices to protect circuits or electrical appliances from overheating and breakage. In general, an overload protection device uses a bimetal, in which two metal plates having different coefficients of thermal expansion are rolled, so that the two metal plates are bent at an expansion difference according to a change in temperature.

Such a bimetal has a function of converting even a relatively small temperature change into a very large displacement, and thus is widely used as a thermometer or as a switch that automatically operates by detecting a temperature change. That is, when an overcurrent flows to the circuit and the temperature of the metal rises, the circuit is cut off by using the property of bending toward the low-expansion material. As the low-expansion material used for bimetal, an alloy having a very small thermal expansion is used. -Chromium-iron alloys, nickel-manganese-iron alloys, manganese-copper-nickel alloys and the like are used.

Typically, the overload protection device proposed in the United States is rated at 135% of the rated current when an AC power supply of 120 volts, 15 or 20 A is used, and the breaker trips within one hour and is rated. It is specified that the breaker can trip within 4 minutes when 200% of the current flows.

However, in the case of using the bimetal, since the change state of the overcurrent must be continuously detected for a predetermined time (4 minutes to 1 hour), there is a problem in that it takes time and cost to test whether the circuit breaker is operated. In addition, since the degree of bimetal curvature due to the overcurrent changes easily with the period of use of the overload protection device, the operating characteristics of the overload protection device tend to change over time. Therefore, overload detection becomes difficult to be performed properly.

In addition, since the time taken for the bimetal to be returned after the overload is detected and the circuit is disconnected is long, there is a large economic or time loss in the subsequent normal operation of the circuit breaker. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a circuit breaker that can protect people and property from fire by more efficiently detecting arc faults, ground faults and overloads occurring in an electrical system. .

In addition, an object of the present invention is to provide a circuit breaker that is easy to manufacture by enabling the detection of arc defects and overloads using one integrated chip (IC).

In addition, the present invention detects an overload by charging a capacitor, and by releasing the charge of the capacitor immediately after the circuit breakdown by the overload detection, enabling a continuous overload detection operation of the circuit breaker, the test for the circuit breaker The purpose is to make it easy.

1 is a block diagram of a conventional arc defect detection circuit.

2 is an arc fault detection circuit of FIG.

3 is a block diagram of another conventional arc fault detection circuit.

4 is a block diagram of a circuit breaker according to a preferred embodiment of the present invention.

5 is an overall circuit diagram of a circuit breaker according to a preferred embodiment of the present invention.

6 is a detailed circuit diagram of an arc fault detection unit in a circuit breaker according to a preferred embodiment of the present invention.

7 is a detailed circuit diagram of an overload detector in a circuit breaker according to a preferred embodiment of the present invention.

8 is a detailed circuit diagram of a voltage comparator used in a circuit breaker according to a preferred embodiment of the present invention.

9 is a detailed circuit diagram of a ground fault detector and a trip unit in a circuit breaker according to a preferred embodiment of the present invention.

10 is a detailed circuit diagram of a display unit in a circuit breaker according to a preferred embodiment of the present invention.

(Name of the code for the main part of the drawing)

400: trip part 500: ground fault detection part

600: arc defect detection unit 700: overload detection unit

800: display unit

410: circuit breaker 420: display power supply

430: trip control unit 440: rectifier

450: smoothing part 510: ground fault test part

520: zero current converter 530: sensitivity control unit

540: noise canceller 550: circuit breaker for earth fault protection

610: current detection unit for arc detection 620: rectifier

630: filter unit 640: first bias voltage generator

650: first reference voltage generator 660: voltage comparison unit

670: second reference voltage generator 680: buffer unit

690: Integrator 695: Second Bias Voltage Generator

710: current converter for detecting overload 720: rectifier

730: voltage divider 740: integrator

750: bias voltage generator 760: voltage comparison unit

770: reference voltage generator 780: discharge control unit

810: power control unit 820: display unit

830: delay unit 840: display control unit

821: arc fault indicator 822: ground fault indicator

823: overload indicator

R1, ...: resistor C1, ...: capacitor

D1, ...: diode Q1, ...: transistor

MOV: Varistor CT: Current Transducer

In order to achieve the above object, the circuit breaker of the present invention is connected to a phase conductive line and a ground conductive line to which AC power is supplied, an arc defect detector for detecting arc faults, a ground fault detector for detecting ground faults, and a capacitance Overload detection unit that detects overload through charging and discharging, display unit for externally displaying an arc fault, ground fault, or overload in case of an overload. It may include a trip portion for adjusting the off.

The arc defect detector includes a current converter for converting a current change flowing in the conductive line into a voltage, a rectifier for rectifying the voltage of the current converter, and a high frequency component by removing a low frequency component from the rectified voltage. A filter unit for providing a bias voltage, a bias voltage generator for generating a bias voltage using the arc detection voltage provided through the filter unit, a reference voltage generator for generating a reference voltage, and a trip for disconnecting the circuit according to the arc detection voltage. And a voltage comparator for outputting a signal and an integrator for charging the first output signal of the voltage comparator to reach a predetermined level, and supplying the charged voltage to the second input terminal of the voltage comparator.

The reference voltage generator may include a first reference voltage generator for first comparison and a second reference voltage generator for second comparison.

The first reference voltage generator may be generated by combining the arc detection voltage and the bias voltage applied through the filter unit.

The arc defect detector may further include a sensitivity adjuster configured to reduce an input impedance of the voltage comparator to prevent a malfunction.

The arc defect detecting unit may further include a buffer unit between the voltage comparing unit and the integrating unit.

The buffer unit may use an emitter follower.

The overload detection unit detects a load current flowing in a phase conductive line and converts the voltage into a voltage, a rectifying unit rectifying the voltage of the current converting unit, and a voltage limiting the voltage rectified in the same phase in the rectifying unit to a predetermined magnitude. Comparing a divider, an integrator that charges the voltage provided from the voltage divider to a predetermined level and provides it to an input terminal of a voltage comparator, and a voltage comparison that determines whether an overload occurs by comparing an overload voltage charged in the integrator and a reference voltage. A reference voltage generator for generating a reference voltage for comparison with an overload voltage applied to the voltage comparator, and after the circuit is cut off due to an overload. It may include a discharge control unit for discharging the charged voltage instantaneously.

The integrator may charge the overload detection signal by using a capacitor and generate a trip signal that cuts off the circuit when the charged voltage reaches a predetermined level.

After the overload is detected and the circuit is cut off, the discharge controller may instantaneously discharge the charged voltage using the reset signal and the set signal of the display unit.

The overload detector may further include a bias voltage generator configured to provide a bias voltage to an input terminal of the voltage comparator in combination with the overload detection signal of the integrator.

The ground fault detection unit is a current converter for converting the difference between the current flowing in the phase conductive line and the ground conductive line of the AC line into a voltage, and a sensitivity control unit for adjusting the sensitivity of the circuit breaker for ground fault protection by receiving the voltage of the current converter And a ground fault protection circuit breaker for determining the occurrence of a ground fault using the detected voltage of the current converter, and a noise removing unit for removing noise from a voltage passing through the detected voltage and the sensitivity control unit of the current converter to provide a ground fault protection circuit breaker. It may include.

The ground fault detector may further include a test unit for testing a ground fault between the conductive line and the current converter.

The trip unit may include a circuit breaker capable of breaking a circuit upon detection of an arc fault, a ground fault, or an overload, a power supply for applying power to the display unit from a phase conductive line, and an arc fault detector, a ground fault detector, or an overload detector. The trip control unit controls the operation of the circuit breaker according to the detected trip signal, a rectifying unit for rectifying the AC voltage flowing through the conductive line, and a noise removing unit connected between the rectifying unit and the ground fault detection unit. It may include a smoothing portion to smooth.

The metal used for the circuit breaker may use bimetal.

The display unit may include a display unit indicating whether an arc fault, a ground fault, or an overload occurs, and a display controller for resetting the display unit by receiving power.

The display unit may include an arc defect display unit for displaying an arc defect to the outside, a ground defect display unit for displaying the ground defect to the outside, and an overload display unit for displaying the occurrence of overload to the outside.

The arc fault display unit, the ground fault display unit, and the overload display unit may display the occurrence of a defect using a light emitting diode.

The display unit may further include a delay unit for temporarily delaying an output signal of the arc defect detector, the ground fault detector, or the overload detector to apply the corresponding signal to the arc fault display unit, the ground fault display unit, and the overload display unit, respectively.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 shows a block diagram of a circuit breaker according to a preferred embodiment of the present invention. Referring to FIG. 4, the circuit breaker of the present invention is connected to the phase conductive line HOT and the ground conductive line NEU so that the ground fault detector 500 detects a ground fault, and the arc fault detects an arc fault. The detector 600 may include an overload detector 700 for detecting whether an overload has occurred. When a ground fault, an arc fault or an overload is detected, the display unit 800 receives an output signal from the ground fault detector 500, the arc fault detector 600, or the overload detector 700, respectively, and displays the occurrence of the defect to the outside. It may include. In addition, in the event of a fault, a trip unit which cuts off a circuit in order to protect human life and property from a fire or a short circuit according to the output signal of the ground fault detector 500, the arc fault detector 600, or the overload detector 700 ( 400).

FIG. 5 shows an overall circuit diagram of the circuit breaker of the present invention shown in FIG. Referring to Figure 4, the circuit breaker of the present invention will be described as follows.

The ground fault detector 500 may detect an amount of current through a zero current transformer ZCT1 connected to the phase conductive line HOT and the neutral conductive line NEU of the AC line. The zero current converter ZCT1 detects the amount of current flowing from the line to the load and the amount of current flowing from the load to the line again, and generates a voltage when the two amounts of current are different from each other. Since the current flowing into the load by the leakage current and the current flowing into the line from the load are different from each other, the generated voltage is filtered to a voltage of a specific frequency through a resistor and a capacitor, and is limited to a certain level of voltage so that the comparison IC (U1) Will be provided. The comparator IC U1 senses a current flowing in the conductive line of the zero current converter ZCT1 and generates a signal that cuts off the circuit when a leakage current occurs.

At this time, the comparison IC U1 may use a low-voltage ground fault protection circuit such as RV4145. In addition, the ground fault detector 410 may include a test switch TESTSW1 for testing a ground fault.

The arc defect detector 600 may convert the current flowing through the conductive line through the current converter CT1 into a voltage, and rectify the converted AC voltage into a single phase. Thereafter, the low frequency component is removed to compare the voltage of the high frequency component including the arc with the reference voltage through the voltage comparator U2 to determine whether the arc is generated. At this time, in the arc defect detection unit 600 of the present invention, the voltage comparator U2 used KIA339F manufactured by KEC (Korea Electronics Co. LTD). KIA339F is a quad voltage comparator configured to perform voltage comparison operation of the overload detector 700 at the same time. At this time, in order to determine the occurrence of an arc fault when a continuous arc occurs by distinguishing it from the instantaneous starting voltage generated at the start of the electrical appliance, the capacitor C23 is output to the output terminal of the voltage comparator U2. The voltage can be charged to a certain level.

The overload detector 700 rectifies the voltage detected through the current converter CT2 to remove the high frequency noise. The noise-free voltage is charged to the capacitor C4 so that the circuit can be interrupted only when a certain level is reached. At this time, it is possible to simplify the configuration of the circuit breaker by judging the voltage level due to overload by using the voltage comparator U2 used in the arc defect detection unit 600 in the same manner.

In addition, in the conventional circuit breaker, since the overload is detected by the bending by the bimetal and it takes a long time for the curved bimetal to return, the operation of the circuit has been limited. However, the circuit breaker of the present invention allows the voltage charged in the capacitor C4 to be discharged through the automatic reset circuit after the circuit is cut off due to the occurrence of overload, thereby enabling an overload detection operation immediately after the circuit is cut off.

The display unit 800 receives an output signal from a corresponding detection unit when a defect occurs in the ground defect detection unit 500, the arc defect detection unit 600, or the overload detection unit 700 so as to externally check whether the defect has occurred. It may include a display means. 5 illustrates an example of using a light emitting diode (LED).

The trip unit 400 is to cut off a circuit in case of a ground fault, arc fault, or overload. A switch (SWITCH) and a solenoid (SOLENOID) to cut off the circuit, and a silicon controlled rectifier (SCR) for controlling the operation of the switch : SCR1), may include a bimetal (B1) to be bent in accordance with the continuous rise of the current to block the circuit. If a fault occurs and a fault generation signal is provided from the ground fault detector 500, the arc fault detector 600, or the overload detector 700, the solenoid SOLENOID will operate to turn off the switch SWITCH to cut off the circuit.

FIG. 6 illustrates a circuit diagram of the arc defect detector 600 in the circuit breaker of FIG. 5. Referring to FIG. 6, the arc defect detector 600 of the present invention includes an arc detection current converter 610 for converting a difference between currents flowing in the phase conductive line HOT and the ground conductive line NEU into voltage, Rectifier 620 for rectifying the voltage generated by the arc detection current converter 610, the filter unit to remove the low frequency components from the voltage components rectified through the rectifier 620 to provide a high frequency component to the voltage comparator 660 630 may include. The voltage comparator 660 uses KEC's KIA339F as the voltage comparator U2 and will receive power through the power supply terminal VCC.

The voltage comparator U2 compares the voltages applied to the input terminals (+ IN A, -IN A, + IN B, -IN B, + IN C, -IN C, + IN D, and -IN D), and outputs them. It consists of a plurality of op amps that generate a signal. The first bias voltage generator 640 generates a first bias voltage at the inverting input terminal (-IN C) of the first OP amplifier, and the second reference voltage is applied to the input terminal (-IN D) of the second OP amplifier. The second reference voltage generator 670 to be applied may include a sensitivity adjusting unit for reducing an input impedance of the voltage comparator U2 to prevent malfunction.

Then, when the buffer unit 680, which serves as a buffer for the signal of the output terminal OUT C of the first OP amplifier, and the signal provided through the buffer unit 680 are charged to reach a predetermined level, Integrator for applying a signal to the non-inverting input terminal (+ IN D) of the second OP amplifier so as to generate a trip signal (AFCI OUT) through the output terminal (OUT D) of the OP amplifier 2 690).

Detailed configuration and operation of the arc defect detection unit 600 will be described in detail as follows.

The arc detection current converter 610 may be formed of a CT (Current Transformer) CT1 connected to the phase conductive line HOT to convert a change in current into a voltage. The output voltage of the CT CT1 may be half-wave rectified with the voltage of the same phase through the diode D10 of the rectifier 620. Here, although the case of rectifying the half wave using the diode D10 and the resistor R46 is taken as an example, full-wave rectification may be performed using two or more diodes. The resistor R46 connected between the diode D10 of the rectifier 620, the cathode terminal of the diode D10, and the ground may serve to protect the CT CT1.

Since the arc is represented by a high frequency component having a high peak value, the filter unit 630 may be provided at the output terminal of the rectifying unit 620 to block the low frequency component. The filter unit 630 has a capacitor C8 connected to the cathode terminal of the rectifier 620 diode D10 and a resistor R15 and a capacitor C33 connected in parallel between the capacitor C8 and ground, and thus a low frequency wave. The ingredients may be blocked. In addition, a Zener diode D11 is connected in parallel with the resistor R15 to cut off the pulse voltage caused by the starting current of the electrical appliance to distinguish between an arc occurrence and a pulse voltage generated at startup. To help.

The cathode terminal of the zener diode D11 may be provided with a coupling capacitor C10 for blocking a DC component of the voltage.

The voltage comparator U2 is configured to compare voltages using a plurality of OP amplifiers. The arc voltage whose DC component is cut off through the coupling capacitor C10 is applied to the non-inverting input terminal + IN C of the first OP amplifier. In the present invention, KEC KIA339F (Quad Voltage Comparator) was used. A 26 volt power supply (+ 26V) is applied to the power supply terminal VCC of the voltage comparator U2, and capacitors C18 and C16 for noise removal may be connected in parallel between the power supply + 26V and the ground.

The first reference voltage may be provided to the voltage comparator U2 from the first bias voltage generator 640 using the voltage of the coupling capacitor C10. That is, the resistor R23 is connected between the coupling capacitor C10 and the ground, the cathode terminal of the diode D13 is connected between the coupling capacitor C10 and the resistor R23, and the anode of the diode D13 is connected. A capacitor C19 and a resistor R22 are connected in parallel between the (Anode) terminal and the ground. In addition, a power supply (+ 26V) is applied to the anode terminal of the diode D13 through the resistor R21. That is, resistors R21 and R22 are connected in series between the power supply (+ 26V) and ground to generate a certain level of bias voltage.

The diode D13 is for applying a first reference voltage generated from a resistor connected in series to a power supply (+ 26V) to the voltage due to the arc, and the resistor R23 is a non-inverting input (+ IN C) of the first OP amplifier. It is to prevent the malfunction by lowering the impedance of. In addition, the capacitor C19 is for removing noise of the first reference voltage.

The first reference voltage generated by the power source (+ 26V) and the resistors R21 and R22 connected in series therewith may be adjusted to have sensitivity through the first reference voltage generator 650 and noise may be removed. The first reference voltage generator 650 includes a variable resistor VR1 connected between a power supply (+ 26V) and ground, an inverting input terminal (-IN C) of the first OP amplifier provided in the voltage comparator U2, and ground. It may be composed of a capacitor (C17) connected between. As a result, the voltage charged in the capacitor C17 is changed by adjusting the variable resistor VR1, and finally, the first reference voltage applied to the voltage comparator U2 is determined.

If an arc fault occurs, the voltage caused by the arc fault is distributed, and since the voltage added with the first reference voltage is applied to the non-inverting input terminal (+ IN C) of the first OP amplifier, the voltage comparator U2 Compares the first reference voltage applied to the inverting input terminal (-IN C) of the first OP amplifier with the voltage applied to the non-inverting input terminal (+ IN C) of the first OP amplifier and selects the output terminal OUT C. Will generate an output signal. That is, in the case where the voltage due to the arc defect occurs, the output voltage in the high state will occur because the voltage applied to the non-inverting input terminal (+ IN C) is greater than the bias voltage of the inverting input terminal (-IN C). . At this time, in the KEC KIA339F voltage comparator U2, the output terminal is an open collector, so the pull-up resistors R18 and R19 are connected to a power supply (+ 26V). The same applies to the output terminal OUT C of the first OP amplifier and the output terminal OUT D of the second OP amplifier.

The first OP amplifier output voltage OUT C of the voltage comparator U2 may be induced to generate a stable output signal by passing through the buffer unit 680. In this case, the buffer unit 680 may use an emitter follower in which a capacitor C24 is connected to an emitter terminal of the transistor Q2.

An integration unit 690 may be connected to an output terminal of the transistor Q2 of the buffer unit 680 to control a trip level of a circuit according to an arc defect. Integrator 690 has a diode D15 and a resistor R26 connected in series to the emitter output terminal of transistor Q2, and one side of resistor R26 has capacitor C23 and resistor R31 connected to ground. Can be connected in parallel between the. When an arc occurs in the conductive line, the arc generating voltage is continuously generated, and thus the output voltage of the current comparator U2 will be continuously charged in the capacitor C23. On the other hand, since the instantaneous voltage occurring at the start of the electrical appliance is generated only at the moment of starting, the capacitor C23 is discharged soon because the output voltage of the voltage comparator U2 is charged only for one instant and there is no subsequent output voltage. will be.

The voltage charged in the capacitor C23 of the integrator 690 may be provided to the non-inverting input terminal + IN D of the second OP amplifier in the voltage comparator U2. In this case, the output terminal of the integrator 690 may further include a second bias voltage generator 695 for applying a bias voltage to the non-inverting input terminal + IN D of the second OP amplifier. The second bias voltage generator 695 may output the voltages divided by the resistors R24 and R30 connected in series between the power supply (+ 26V) and the ground and the resistors R24 and R30 to output voltages of the integrator 690. A diode D14 may be provided between the node between the two resistors R24 and R30 and the output terminal of the integrator 690 to provide to. Capacitors C21 and C22 connected to ground may be provided at the anode terminal and the cathode terminal of the diode D14, respectively. The capacitors C21 and C22 are for removing noise. Therefore, when no arc is generated, a constant output voltage of the second bias voltage generator 695 is provided to the non-inverting input terminal (+ IN D) of the second OP amplifier, and an arc defect occurs to generate the integral part. When the voltage 690 is charged above a certain level, the charged voltage will be applied to the non-inverting input terminal + IN D of the second OP amplifier.

The reference voltage applied to the inverting input terminal -IN D of the second OP amplifier may be provided through the second reference voltage generator 670. The second reference voltage generator 670 may include a variable resistor VR2 connected between the power supply (+ 26V) and the ground, and a capacitor C20 connected between the variable resistor VR2 and the ground. Accordingly, the second reference voltage applied to the voltage comparator U2 may be adjusted by adjusting the variable resistor VR2.

As a result, the voltage comparator U2 compares the voltage applied to the non-inverting input terminal + IN D of the second OP amplifier with the second reference voltage applied to the inverting input terminal -IN D of the second OP amplifier. When the voltage applied to the non-inverting input terminal (+ IN D) due to the arc fault is greater than the second reference voltage, the output signal AFCI OUT may be generated to interrupt the circuit.

At this time, the voltage comparator U2 of KEC is configured such that four op amps are included in a single chip, and the pins (+ IN B, -IN B, + IN A,-) which are not used in the arc fault detection unit 600 are used. IN A, OUT A, and OUT B) may be used when the overload detection unit 700 detects an overload.

8 shows the internal configuration of the KIA 339F voltage comparator U2 manufactured by KEC. Referring to FIG. 8, it can be seen that four op amps A, B, C, and D generate output voltages by comparing voltages applied through an inverting input and a non-inverting input.

7 illustrates a detailed circuit diagram of the overload detector 700 in the circuit breaker according to the preferred embodiment of the present invention. Referring to Figure 7, the configuration and operation of the overload detection unit 700 of the present invention will be described.

Since the overload detection unit 700 shares the voltage comparator U2 consisting of a single chip with the OP amplifier used for the overload detection, the overall circuit configuration is simplified and manufacturing is easy.

The overload detector 700 detects a load current flowing in the phase conductive line HOT and converts the voltage into a voltage, and the rectifier 720 rectifies the voltage of the overload detection current converter 710. ), A voltage divider 730 for limiting the voltage rectified in the same phase to a predetermined magnitude, an integrator 740 for charging a voltage provided from the voltage divider 740, and a voltage charged in the integrator 740. A bias voltage generator 750 for adding a bias voltage, an overload voltage charged in the integrator 740 and a reference voltage are applied to the voltage comparator 760 and the voltage comparator 760 to determine whether an overload has occurred. It may include a reference voltage generator 770 for generating a reference voltage for comparison with the overload voltage to be compared, and a discharge controller 780 for instantaneously discharging the voltage charged in the integrator 740 when an overload occurs.

The overload detection current converter 710 may include a CT CT2 that detects and converts a load current flowing in the phase conductive line into a voltage.

The rectifier 720 may include a diode D2 connected to the CT CT2 and half-wave rectified voltage, and a capacitor C2 and a resistor R47 connected in parallel between the cathode terminal of the diode D2 and ground. Can be. In the present invention, the half-wave rectification using one diode D2 has been described as an example, but it may be possible to perform full-wave rectification using two or more diodes. The capacitor C2 is for removing high frequency noise included in the voltage detected by the current converter CT2.

The voltage divider 730 includes a resistor R3 connected to the cathode terminal of the diode D2, a power source (+ 26V) applied to the collector, and a base terminal connected to the resistor R3. Q1), a resistor R6 and a Zener diode D7 connected in parallel between the resistor R3 and ground. The capacitor C3 may be connected between the emitter terminal of the transistor Q1 and the ground. Accordingly, the voltage is distributed by the resistors R3 and R6 connected to the rectifier 720, and the voltage corresponding to the R6 resistor is provided to the integrator 740 through the transistor Q1 serving as a buffer. The zener diode D7 is used to protect the circuit and prevent malfunction due to instant charging of the integrator 740 by limiting the peak voltage caused by the rapid change in the current generated during the operation of the electrical appliance.

The integrator 740 includes a diode D5 and a resistor R4 connected in series to the emitter terminal of the transistor Q1, a capacitor C4 and a resistor R9 connected in parallel between the resistor R4 and ground, and a resistor. It may be composed of resistors R5 and R10 connected in series between R4 and ground.

The capacitor C4 is for charging the voltage applied through the transistor Q1, so that the voltage charged to the capacitor C4 reaches a predetermined level so that a trip signal OLCI OUT may be generated to interrupt the circuit. do. The diode D5 prevents the voltage charged in the capacitor C4 from flowing backward through the transistor Q1, and the resistor R4 prevents the voltage in the capacitor C4 from being charged by the instantaneous current change of the electrical appliance. It serves to block. The resistor R9 determines the time when the voltage is charged and discharged in the capacitor C4, and the resistors R5 and R10 are applied to the non-inverting input terminal (+ IN B) of the third OP amplifier in the voltage comparator U2. Limiting and lowering the input impedance to prevent a malfunction of the voltage comparator U2. The voltage charged in the capacitor C4 is applied to the non-inverting input terminal + IN B of the third OP amplifier through the resistor R5, and compared with the reference voltage applied to the inverting input terminal -IN B, and output signal ( OLCI OUT will occur.

A bias voltage generator 750 is connected to the non-inverting input terminal + IN B of the third OP amplifier to apply a bias voltage. Accordingly, when no overload occurs, the capacitor C4 is not charged with a voltage higher than the bias voltage so that the bias voltage of the bias voltage generator 750 is applied to the non-inverting input terminal + IN B of the third OP amplifier. will be. On the other hand, when the circuit is overloaded and the voltage charged in the capacitor C4 is greater than or equal to the bias voltage, the voltage charged in the capacitor C4 is applied to the non-inverting input terminal + IN B of the third OP amplifier so that the reference voltage is applied. Will be compared to

The bias voltage generator 750 has a resistor (R2, R11) connected in series between the power supply (+ 26V) and the ground, and an anode terminal is connected between the R2 resistor and the R11 resistor, the third voltage comparator (U2) A diode D6 having a cathode terminal connected to the non-inverting input terminal + IN B of the OP amplifier, and a capacitor C5 connected between the anode terminal of the diode D6 and ground. Resistors R2 and R11 distribute the power supply (+ 26V) to generate a bias voltage, and capacitor C5 is used for noise cancellation. The diode D6 is for blocking the voltage charged in the integrator 740 from flowing into the bias voltage generator 750.

Since the voltage comparator U2 is used in common with the arc defect detector 600, the input and output terminals (+ IN C, -IN C, + IN D, -IN D, OUT D, OUT of the first and second OP amplifiers) are used. The connection status for C) is not shown. In addition, since the input terminals (+ IN A and -IN A) of the fourth OP amplifier are not used, they are grounded. The power supply terminal VCC is applied to the power supply (+ 26V) in the same way as the arc defect detection unit 600 of FIG. 6 and the capacitors C16 and C18 are connected in parallel between the power supply (+ 26V) and the ground to remove noise. Can be.

In the voltage comparator U2, a reference voltage generated by the reference voltage generator 770 may be applied to the inverting input terminal —IN B of the third OP amplifier to compare with the charging voltage of the integrator 740. The reference voltage generator 770 may include a variable resistor VR3 connected between the power supply (+ 26V) and the ground and a capacitor C15 connected between the variable resistor VR3 and the ground. Therefore, the reference voltage applied to the inverting input terminal -IN B of the third OP amplifier can be adjusted by adjusting the variable resistor VR3.

As a result, when the voltage generated by the overload is charged in the capacitor C4 of the integrator 740, and the voltage charged in the capacitor C4 is equal to or greater than the reference voltage, the output terminal OUT B of the third OP amplifier is used. An output signal (OLCI OUT) will be generated that can break the circuit. At this time, since the output terminal OUT B of the third OP amplifier is also composed of an open collector, the pull-up resistor R20 will be connected to the power supply (+ 26V).

In the conventional case of detecting an overload using the bimetal's curvature, after the overload is detected and the bimetal is bent and thus the circuit is cut off, the operation of the overload detection circuit is stopped until the curved bimetal returns and accordingly the overload The detection operation could not be made properly. The overload detection unit 700 of the present invention controls the trip of the circuit by charging the capacitor C4, and after the circuit is blocked by the overload, the overload detection unit 700 can immediately discharge the voltage charged in the capacitor C4. 780).

Therefore, the voltage charged in the capacitor C4 is controlled so that the operation of the circuit is controlled according to the charging of the capacitor, and the overload detection operation can be resumed immediately after the circuit is interrupted, without interrupting the circuit due to the overload. By discharging, it can be performed quickly by the overload detection and detection resume operation. In addition, by reducing the test time required for the test process of the overload detection circuit, it is possible to save economic cost or time.

The discharge controller 780 selects the resistance of the overload display unit indicating whether the overload is detected by the display unit 800, and controls whether the capacitor C4 is discharged by using the voltage signals OLCI RESET and OLCI SET across the resistor. Can be.

When an overload is detected by the overload detector 700, a current flows to the overload display unit of the display 800 to display an overload occurrence in the outside. At this time, if a current flows, a voltage difference of a certain magnitude occurs across the resistance of the overload display unit. On the contrary, when no current is flowing to the overload display unit because the overload is not detected, the voltage across the resistor will maintain the same value.

When current flows through the resistor, the resistance node having the higher voltage is used as the reset signal (OLCI RESET), and the opposite node is used as the set signal (OLCI SET). The reset signal OLCI RESET is applied to the base terminal of the first transistor Q4 through the resistors R40 and R42 connected in series, and the collector terminal of the second transistor Q5 is connected to a node between the R40 resistor and the R42 resistor. do. The set signal OLCI SET is applied to the base terminal of the second transistor Q5 through resistors R43 and R44 connected in series, and a resistor R45 is connected to the node between the R43 and R44 resistors and leads to ground. The emitter terminals of the first and second transistors Q4 and Q5 lead to ground.

In the normal state in which the overload does not occur, since no current flows in the overload display unit of the display unit 800, the reset signal OLCI RESET and the set signal OLCI SET across the resistor will maintain substantially the same voltage. At this time, if the resistance values of R43, R44, and R45 are set to the extent that the second transistor Q5 is turned on by the set signal OLCI SET, the second transistor Q5 is turned on so that the collector terminal and the emitter terminal are turned on. The voltage VCE between them will be near zero. Accordingly, the first transistor Q4 may be turned off so that the voltage is normally charged in the capacitor C4 of the integrator 740.

On the other hand, if an overload is detected through the overload detection unit 700, a current flows in the overload display unit of the display unit 800 to generate a voltage difference across the resistor. Accordingly, the set signal OLCI SET is maintained at a level at which the predetermined voltage is lower than that of the reset signal OLCI RESET, so that the second transistor Q5 will not be turned on. Accordingly, since the first transistor Q4 to which the reset signal OLCI RESET is applied is turned on, the voltage charged in the capacitor C4 of the integrator 740 will be discharged through the first transistor Q4. .

9 illustrates a detailed circuit diagram of the trip unit 400 and the ground fault detection unit 500 in the circuit breaker according to the preferred embodiment of the present invention. Referring to FIG. 9, the ground fault detection unit 500 of the present invention may include a zero current converter 520 for converting a difference between a current flowing through the phase conductive line HOT and the ground conductive line NEU of the AC line into a voltage. , A sensitivity adjusting unit (discharge control unit) for adjusting the sensitivity of the ground fault detection unit 500, a ground fault protection circuit breaker 550 for detecting a ground fault, and a noise removing unit 540. In addition, a ground fault test unit 510 for testing a ground fault may be connected to the conductive line.

The zero current converter 520 connected to the conductive line uses a ZCT (Zero Current Transformer: ZCT1) to compare the current flowing into the load and the current flowing out through the phase conductive line HOT and the ground conductive line NEU. Will be provided. ZCT (ZCT1) detects the amount of current flowing from the line to the load and the amount of current flowing out of the load back to the line and will generate a voltage when the two amounts of current are different. The generated voltage is applied to the ground fault protection circuit breaker 550 through one line, and the other line is applied to the sensitivity controller.

9 illustrates a case where a low voltage ground fault protection circuit such as RV4145 is used as the circuit breaker 550 for ground fault protection.

The sensitivity control unit is connected to the capacitor (C1) and the resistor (R8) in series between the one side line of the ZCT (ZCT1) and the first terminal of the circuit breaker 550 for ground fault protection. A resistor R14 and a capacitor C6 are connected in parallel between the first terminal and the seventh terminal (output terminal) of the ground fault protection circuit breaker 550. The C1 capacitor is a coupling capacitor to cut off a DC component, and the resistors R8 and R14 and the capacitor C6 serve to adjust the ground fault detection sensitivity of the circuit breaker 550 for ground fault protection.

The noise removing unit 540 is connected to the second terminal of the ground fault protection circuit breaker 550 at the other line of the ZCT (ZCT1), the second terminal (input terminal) and the R8 resistor and the ground fault protection circuit breaker 550. Capacitors C9 and C14 are provided between grounds, respectively. The third terminal (reference voltage terminal) of the ground fault protection circuit breaker 550 is connected to the smoothing unit 450 of the trip unit 400 by connecting the capacitor C11.

The ground fault test unit 510 includes a resistor R1 connected between the phase conductive line HOT and ZCT ZCT1, and a test switch TSW SW1 provided between the ground conductive line NEU and ZCT ZCT1. It may include.

In addition to the leakage current, the zero current converter 520 generates an output signal even when induction noise or high frequency noise occurs. Therefore, the zero current converter (eg, through the capacitor C32 of the display unit 800) By delaying the output signal of 520 for a predetermined time and interrupting the circuit when the output signal reaches a predetermined level, the ground fault detection unit 500 may prevent the malfunction from occurring due to the noise. Therefore, when the leakage current is detected, the ground fault detection signal GFCI OUT may be outputted through the terminal 5 (trigger terminal) of the ground fault protection circuit breaker 550. Also, the output signal (+ 26V: LED RESET) of terminal 6 (Zener voltage terminal) turns off the light emitting diode of the display unit 800 without a separate reset operation after the ground fault is detected and the circuit is cut off. Used as a signal to make

In addition, the trip unit 400 of the present invention applies power to the display unit 800 from the circuit breaker 410 and the phase conductive line HOT, which can cut off the circuit when the arc fault, the ground fault, or the overload is detected. The display power supply unit 420, the trip control unit 430 for controlling the operation of the circuit breaker 410 by the trip signal (TRIP SIGNAL), the rectifier 440 and the rectifier 440 for rectifying the AC voltage of the conductive line It may include a smoothing unit 450 for smoothing the rectified voltage to a direct current.

The circuit breaker 410 is bent in accordance with the current of the phase conductive line to block the circuit B1, the circuit breaker SWITCH, and the switch SWITCH to control the operation of the solenoid SOLENOID and the phase. The varistor MOV1 may be connected between the conductive line HOT and the ground conductive line NEU to limit the voltage at the surge input. Metal (B1) generally uses a bimetal having a resistance value of several milliohms, but the circuit breaker of the present invention does not use the bimetallic bending characteristic, and thus is not limited to bimetal. All will be available.

The display power supply 420 may include a diode D1 connected to the phase conductive line HOT and a resistor R7 connected to the cathode terminal of the diode D1. Power is supplied to the display 800 through the display power supply 420.

The trip controller 430 may include a Silicon Controlled Rectifier (SCR1) connected to a solenoid, a resistor R12 and a capacitor C7 connected in parallel between a control terminal of the SCR SCR1 and a ground. . In order to operate the SCR SCR1 when a defect is detected, an output signal of the arc defect detecting unit 600, the ground defect detecting unit 500, or the overload detecting unit 700 is applied to the control terminal of the SCR SCR1. Therefore, when the SCR SCR1 is turned on, a current flows through the solenoid SOLENOID, and thus a magnetic field is formed in the solenoid SOLENOID to operate the switch SWITCH to cut off the circuit. The resistor R12 and the capacitor C7 are for preventing the malfunction of the SCR SCR1.

The rectifier 440 may include diodes D8 and D9 having anode terminals connected in parallel to the ground, and diodes D3 and D4 connected in series to the D8 and D9 diodes, respectively. The cathode terminal of the D8 diode is connected to the phase conductive line HOT, and the cathode terminal of the D9 diode is connected to the ground conductive line NEU. The cathode terminals of the D3 diode and the D4 diode are connected to one side of the solenoid. The rectifier 440 is provided to the smoothing unit 450 by full-wave rectifying the AC voltage flowing through the conductive line.

The smoothing unit 450 may include a resistor R13 connected to an anode terminal of the SCR SCR1, a capacitor C12, and a zener diode D12 connected in parallel between another node of the resistor and ground. In addition, a capacitor C13 is connected between the power supply (+ 26V) and ground, and a resistor (R16) is connected between the power supply (+ 26V) and the cathode terminal of the zener diode D12. The voltage rectified by the rectifier 440 may be smoothed primarily by the resistor R13, the capacitor C12, and the zener diode D12, and may be secondarily smoothed by the R16 resistor and the C13 capacitor.

Typically, the U.S. standard states that when using 120 volts, 15 or 20 A of AC power, a current of 135% of the rated current flows, the breaker trips within one hour, and 200% of the rated current. The circuit breaker trips within 4 minutes when the current flows.

However, this standard has to be different in the case of other countries having a rated power supply, such as Korea, which uses 220 volts. This is possible by controlling the timing of the operation of the SCR (SCR1).

10 is a detailed circuit diagram of the display unit 800 in the circuit breaker according to the preferred embodiment of the present invention.

Referring to FIG. 10, in the circuit breaker of the present invention, the display unit 800 may display an arc defect display unit 821 for displaying an arc defect externally, a ground defect display unit 822 for displaying an earth fault externally, and an overload occurrence. The display unit 820 including all of the overload display unit 823 for external display, and the occurrence of a defect causes power failure to be applied to the arc defect display unit 821, the ground fault display unit 822, or the overload display unit 823 due to a defect. The display controller 840 may be configured to reset the displayed display device. In addition, by temporarily delaying the output signals AFCI OUT, GFCI OUT, and OLCI OUT of the arc defect detection unit 600, the ground defect detection unit 500, or the overload detection unit 700, the arc defect display unit 821 and the ground defect display unit 822 are provided. And a delay unit 830 for preventing a malfunction of the display apparatuses SCR2, SCR3, and SCR4 by being applied to the overload display unit 823, respectively.

In addition, when a fault is detected and the output signals AFCI OUT, GFCI OUT, and OLCI OUT of the arc fault detector 600, the ground fault detector 500, or the overload detector 700 occur in a high state, the trip control unit ( It may include an output signal supply unit 460 to provide to 430. The output signal supply unit 460 includes a diode D18 and a resistor R29 connected in series with the arc output signal AFCI OUT, a diode D17 and a resistor R28 connected in series with the ground output signal GFCI OUT, and an overload. It consists of a diode D16 and a resistor R27 connected in series with the output signal OLCI OUT. The lines of the resistors R27, R28, and R29 connected to the trip controller 430 are combined into one line and connected to the trip controller 430. Although the output signal supply unit 460 is illustrated in the display unit 800 of FIG. 10, the output signal supply unit 460 may be included in the trip unit 400 or other parts.

The power supplied to the display unit 820 is provided from the display power supply unit 420, and a power source in which the zener diode D19 and the capacitor C26 are connected in parallel to supply power to a stable level for operating the display unit 820. The controller 810 may be included.

The arc fault display unit 821, the ground fault display unit 822, and the overload display unit 823 may be configured using light emitting diodes LED1, LED2, and LED3.

That is, in the arc defect display unit 821, the light emitting diode LED1 and the SCR SCR2 are connected in series between a power line applied to the display power supply unit 420 and a ground. A resistor R36 and a capacitor C27 are connected in parallel between the SCR (SCR2) control terminal to which the arc output signal AFCI OUT is applied and the ground. The resistor R36 and the capacitor C27 are for preventing the malfunction of the SCR SCR2. Therefore, when an arc fault occurs and an arc output signal AFCI OUT in a high state is applied to the arc fault display portion 821, the SCR SCR2 is turned on, whereby the light emitting diode LED1 is operated to the outside. An arc fault has occurred. At this time, each of the display units 821, 822, and 823 can use a light emitting diode (LED) as a display device. It is obvious that not only the light emitting diode but other display means can be used.

The configuration and operation of the ground fault display unit 822 and the overload display unit 823 are the same as the configuration and operation of the arc defect display unit 821, as shown in FIG.

Each display unit 821, 822, and 823 may be connected to one resistor R25 to receive a power signal POWER.

The display controller 840 includes a transistor Q3 to which a power source (+ 26V: LED RESET) for resetting the display units 821, 822, and 823 is applied to the base through the capacitor C25. The collector terminal of transistor Q3 is connected to the common node of each display portion 821, 822, 823, and the emitter terminal is connected to ground. Therefore, when a defect is detected and the arc defect display part 821, the ground defect display part 822, or the overload display part 823 are operated, and then a reset signal (+ 26V: LED RESET) is applied to the display part 800, the transistor The display unit 800 may be reset by turning on the Q3 to block current flowing through the display units 821, 822, and 823.

In addition, the overload detection unit 700 detects the overload by the capacitance charged in the capacitor C4, and after the circuit is cut off by the overload detection, the discharge control unit 780 to discharge the capacitor (C4) immediately The reset signal OLCI RESET and the set signal OLCI SET used here are supplied across the resistor R25 of the display unit 820, respectively.

Delay unit 830 is a diode (D20, D21, D22) between each output signal (AFCI OUT, GFCI OUT, OLCI OUT) line and the SCR (SCR2, SCR3, SCR4) control terminal of the corresponding display unit (821, 822, 823) ) And resistors R36, R39, and R41 are respectively connected, and capacitors C30, C31, and C32 are respectively connected between each output signal AFCI OUT, GFCI OUT, OLCI OUT line and ground. The capacitors C30, C31, and C32 delay the output signals AFCI OUT, GFCI OUT, and OLCI OUT due to defects, thereby preventing malfunction of the display units 821, 822, and 823.

As described above, the circuit breaker of the present invention can more easily detect the occurrence of a defect in the process of measuring the current change amount of the AC power line, and determine the arc fault, ground fault and overload according to the current change amount, accordingly Fires caused by defects can be prevented beforehand.

In addition, according to the circuit breaker of the present invention, since an arc fault and an overload can be detected using one voltage comparator, the circuit configuration can be made simpler, thereby securing economical efficiency and making product manufacture convenient. have.

In addition, the circuit breaker of the present invention can detect the overload using the capacitance and can immediately discharge the charged charge after the overload detection, thereby making the overload detection easier.

In addition, since the overload detection and reset operations can be instantaneously, the time taken in the test procedure for overload detection can be reduced, thereby reducing the cost and effort. Therefore, compared to the case of using the conventional bimetal curves, it is possible to ensure the efficiency of the test and overload detection.

Although the above has been described in detail through the preferred embodiment of the circuit breaker and the implementation method of the present invention, the contents are not limited to the field of the present invention described in the claims below. In addition, in the art, it will be apparent to those skilled in the art that various changes or modifications are made within the scope of the present invention.

Claims (78)

In a power distribution system that can cut off power when a fault occurs in AC power, A first detector connected between a phase conductive line to which AC power is supplied and a ground conductive line to detect an arc defect according to a change in current flowing through the conductive line; A second detector connected to the phase conductive line and the ground conductive line to detect an overload using a change in capacitance according to a current flowing through the conductive line; And A trip unit capable of interrupting power to the circuit according to an output signal of the first detector or the second detector; Circuit breaker comprising a. The method of claim 1, The first detection unit An arc detection current converter for converting a current change flowing in the conductive line into a voltage; A rectifier for rectifying the voltage of the arc detection current converter; A filter unit for removing a low frequency component from the rectified voltage to provide a high frequency component; A reference voltage generator which generates a reference voltage using the voltage generated by the filter unit; A voltage comparison unit comparing the output voltage of the filter unit with a reference voltage and outputting a trip signal to cut off the circuit according to the result; And Integrator for feeding back the charged voltage to the voltage comparator when the output signal of the voltage comparator is charged to reach a predetermined level Circuit breaker comprising a. The method of claim 2, The rectifying unit Circuit breaker, which is a half-wave rectifier circuit consisting of a diode (D10) and a resistor (R46). The method of claim 2, The filter unit A capacitor C8 connected to the cathode terminal of the rectifier diode D10; A resistor (R15), a diode (D11) and a capacitor (C33) connected in parallel between the capacitor (C8) and ground, respectively; A capacitor C10 connected between the cathode terminal of the diode D11 and a reference voltage generator Circuit breaker comprising a. The method of claim 2, The reference voltage generator A first reference voltage generator providing a first reference voltage for comparison with an output voltage of the filter unit; And A second reference voltage generator providing a reference voltage for comparing with the output voltage of the integrator Circuit breaker comprising a. The method of claim 5, The first reference voltage generator A variable resistor VR1 connected between the power supply and the ground and configured to adjust a voltage applied to the inverting input terminal -IN C of the voltage comparator 1 OP amplifier through a control terminal; And A capacitor C17 connected between the control terminal of the variable resistor VR1 and ground. Circuit breaker comprising a. The method of claim 5, The second reference voltage generator A variable resistor VR2 connected between a power supply and a ground and adjusting a reference voltage applied to the voltage comparator inverting input terminal -IN D through a control terminal; And A capacitor C20 connected between the control terminal of the variable resistor VR2 and a ground. Circuit breaker comprising a. The method according to claim 2 or 5, The voltage comparison unit A first OP amplifier configured to receive an output voltage of the filter unit through a non-inverting input terminal (+ IN C) and receive a first reference voltage through an inverting input terminal (−IN C); And A second OP amplifier provided with the output voltage of the integrator portion through the non-inverting input terminal (+ IN D) and with the second reference voltage supplied to the Circuit breaker comprising a. The method of claim 2, The integral part A diode D15 having an anode terminal connected to an output terminal OUT C of the voltage comparator first OP amplifier; A resistor (R26) connected between the cathode terminal of the diode (D15) and the non-inverting input terminal (+ IN D) of the voltage comparator second OP amplifier; And A capacitor (C23) and a resistor (R31) connected in parallel between the non-inverting input terminal (+ IN D) and the ground of the second OP amplifier Circuit breaker comprising a. The method of claim 2, Buffer unit connected between the voltage comparator and the integrator, for stably providing the output signal of the voltage comparator Circuit breaker further comprising a. The method of claim 10, The buffer unit Capacitor C24 is connected to the emitter terminal, power is applied to the collector terminal, and the base terminal is connected to the output terminal OUT C of the first op amp of the voltage comparator to provide an output signal to the integrator through the collector terminal. Emitter Followers Circuit breaker. The method of claim 8, A first bias voltage generator for applying a bias voltage to the first OP amplifier of the voltage comparator; And A second bias voltage generator for applying a bias voltage to the second op amp of the voltage comparator; Circuit breaker further comprising a. The method of claim 12, The first bias voltage generator is A resistor R23 connected between the capacitor portion C10 of the filter portion and ground; A diode (D13) having a cathode terminal connected to a node between the capacitor (C10) and a resistor; A capacitor C19 and a resistor R22 connected in parallel between the anode terminal of the diode D13 and ground, respectively; And A resistor R21 connected between the anode terminal of the diode D13 and a power supply. Circuit breaker comprising a. The method of claim 12, The second bias voltage generator Resistors R24 and R30 connected in series between the power supply and ground; A diode (D14) having an anode terminal connected to a node between the resistor (R24) and a resistor (R30), and a cathode terminal of which is connected to a non-inverting input terminal (+ IN D) of a voltage comparator second OP amplifier; A capacitor C21 connected between the anode terminal of the diode D14 and ground; And A capacitor C22 connected between the cathode terminal of the diode D14 and ground. Circuit breaker comprising a. The method of claim 1, The overload detection unit A current converter configured to detect a load current flowing in the phase conductive line and convert the load current into a voltage; A rectifier for rectifying the voltage of the current converter; A voltage divider configured to limit the voltage rectified in the same phase in the rectifier to a predetermined magnitude; An integrator configured to charge the voltage provided from the voltage divider to a predetermined level; A voltage comparing unit comparing the voltage charged in the integrating unit with a reference voltage to determine whether an overload occurs; A reference voltage generator for generating the reference voltage; And Discharge control unit for discharging the voltage charged in the integrator momentarily after an overload occurs and the circuit is cut off Circuit breaker comprising a. The method of claim 15, The rectifying unit A diode D2 connected to the current converter to rectify the voltage; And A capacitor C2 and a resistor R47 connected in parallel between the cathode terminal of the diode D2 and ground. Circuit breaker comprising a. The method of claim 15, The voltage divider A resistor R3 connected to the cathode terminal of the rectifier diode D2; A transistor Q1 having power applied to a collector terminal, receiving a voltage rectified through the resistor R3 as a base terminal, and having a capacitor C3 connected between the emitter terminal and ground; And A resistor R6 and a diode D7 connected in parallel between the base terminal of the transistor Q1 and ground, respectively. Circuit breaker comprising a. The method of claim 15, The integral part A diode D5 connected in series with the emitter terminal of the voltage divider transistor Q1; A resistor R4 connected to the cathode terminal of the diode D5; A capacitor C4 and a resistor R9 connected in parallel between the resistor R4 and ground, respectively; And Resistor R5 and resistor R10 connected in series between the resistor R4 and ground Including, And a circuit breaker for providing an overload detection signal to a non-inverting input terminal (+ IN B) of the voltage comparator through a node between the resistor (R5) and resistor (R10). The method of claim 15, The reference voltage generator A variable resistor VR3 connected between a power supply and a ground and having a control terminal connected to the inverting input terminal -IN B of the voltage comparator; And A capacitor C15 connected between the control terminal of the variable resistor VR3 and ground. Circuit breaker comprising a. The method of claim 15 or 18, The voltage comparison unit A third OP amplifier provided with a node voltage between the resistor R5 and the resistor R10 of the integrator and provided with a non-inverting input terminal (+ IN B) and a reference voltage with an inverting input terminal (-IN B); Circuit breaker comprising a. The method of claim 15, The discharge control unit The first transistor is grounded, the collector terminal is connected to the resistor R100 connected in series with the capacitor C4 of the integrator, and the first transistor receives the reset signal of the display unit through the series connected resistors R40 and R42 to the base terminal. (Q4); A second transistor Q5 having an emitter terminal grounded and a collector terminal connected to a node between the resistor R40 and R42; Resistors R43 and R44 connected in series with the base terminal of the second transistor Q5 to provide a set signal of a display unit; And A resistor R45 connected between the node between the resistor R43 and the resistor R44 and ground. Circuit breaker comprising a. The method of claim 15, A bias voltage generator that provides a bias voltage to the input of the voltage comparator in combination with the overload detection signal of the integral Circuit breaker further comprising a. The method of claim 22, The bias voltage generator Resistors R2 and R11 connected in series between the power supply and ground; A diode (D6) having an anode terminal connected to a node between the resistor (R2) and a resistor (R11), and a cathode terminal of which is connected to a non-inverting input terminal (+ IN B) of the voltage comparator third OP amplifier; And Capacitor C5 connected between the anode terminal of diode D6 and ground Circuit breaker comprising a. The method of claim 1, A ground fault detection unit connected between a phase conducting wire to which AC power is supplied and a ground conducting wire to detect a ground fault according to a change in current flowing through the conductive wire. Circuit breaker further comprising a. The method of claim 24, The ground fault detection unit A ground fault detection current converting unit for converting a current flowing in the phase conductive line and the ground conductive line of the AC line into a voltage; A sensitivity controller configured to adjust the sensitivity of the circuit breaker for ground fault protection by receiving the voltage of the current converter; A ground fault protection circuit breaker for determining a ground fault occurrence using the detected voltage of the current converter; And The noise removing unit removes noise from the voltage passing through the detection voltage and the sensitivity control unit of the current converter and provides the circuit breaker for ground fault protection. Circuit breaker comprising a. The method of claim 25, The sensitivity control unit A capacitor C1 and a resistor R8 connected in series between one line of the current converter and an input terminal of the circuit breaker for ground fault protection; And Resistor (R14) and capacitor (C6) connected in parallel between terminal 7 (output terminal) and terminal 1 of the circuit breaker for earth fault protection Circuit breaker comprising a. The method of claim 25 or 26, The noise removing unit A capacitor C9 connected between the resistor R8 of the sensitivity control unit and the input terminal 2 of the circuit breaker for earth fault protection; A capacitor C14 connected between the reference voltage terminal 3 of the circuit breaker for ground fault protection and ground; And Capacitor C11 connected between the reference voltage terminal 3 of the circuit breaker for earth fault protection and the smoothing part of the trip part. Circuit breaker comprising a. The method of claim 25, Ground fault test section for testing ground faults between the conducting lines and the current converter Circuit breaker further comprising a. The method of claim 28, The ground fault test unit A resistor R1 connected between the phase conductive line and the current converter; And Test switch (TEST SW1) provided between the ground conducting wire and the current converter Circuit breaker comprising a. The method of claim 1, The trip part A circuit breaker capable of breaking the circuit upon detection of an arc fault, ground fault or overload; A power supply unit applying power to the display unit from the phase conductive line; A trip controller for controlling whether the circuit breaker is operated by a trip signal applied from an arc fault detector, a ground fault detector, or an overload detector; A rectifier for rectifying an AC voltage flowing through the conductive line; And A smoothing unit connected between the rectifying unit and the noise removing unit of the ground fault detection unit to smooth the rectified voltage with a direct current. Circuit breaker comprising a. The method of claim 30, The circuit breaker A metal B1 for interrupting the circuit according to a change in current flowing through the phase conductive line; A circuit breaker switch (SWITCH) provided in the phase conductive line; A solenoid adjusting the operation of the switch SWITCH according to a voltage applied adjacent to the switch SWITCH; And Varistor (MOV1) connected between phase and ground conductors to limit voltage at surge input Circuit breaker comprising a. The method of claim 31, wherein The metal is Bimetal Circuit Breaker. The method of claim 30, The power supply unit A diode D1 having an anode terminal connected to the phase conductive line; And A resistor R7 connected to the cathode terminal of the diode D1 to supply power to the display unit. Circuit breaker comprising a. The method of claim 30, The trip control unit An SCR (SCR1) having an anode terminal connected to the solenoid SOLENOID and a cathode terminal connected to ground, and receiving a trip signal from the arc fault detector, the ground fault detector or the overload detector at the control terminal; And A resistor R12 and a capacitor C7 connected in parallel between the control terminal of the SCR SCR1 and ground. Circuit breaker comprising a. The method of claim 30, The rectifying unit A diode D8 having an anode terminal connected to ground and a cathode terminal connected to a phase conductive line; A diode D9 having an anode terminal connected to ground and a cathode terminal connected to a ground conductive line; And Diodes D3 and D4 having anode terminals connected in series to the cathode terminals of the diodes D8 and D9 and the cathode terminals connected to one side of the solenoid SOLENOID, respectively. Circuit breaker comprising a. The method of claim 30, The smoothing part A resistor R13 connected to the anode terminal of the trip control unit SCR SCR1; A capacitor C12 and a diode D12 connected in parallel between the resistor R13 and ground; A capacitor C13 provided between a power supply (+ 26V) connected to the capacitor C11 of the noise canceling unit in the ground fault detection unit and a ground; And Resistor R16 connected between the power supply (+ 26V) and the cathode terminal of the diode D12. Circuit breaker comprising a. The method of claim 1, A display unit for externally displaying whether a defect occurs according to an output signal of the first detector or the second detector; Circuit breaker further comprising a. The method of claim 37, The display unit A display unit displaying whether an arc fault, a ground fault, or an overload occurs; And A display controller for resetting the display unit by receiving power Circuit breaker comprising a. The method of claim 38, The display unit An arc defect display unit for displaying an arc defect outside; A ground fault display unit for displaying a ground fault to the outside; An overload display unit for displaying an overload occurrence to the outside; And A resistor R25 connected between each of the display unit and the power supply. Circuit breaker comprising a. The method of claim 39, The arc defect display unit A display device having an anode terminal connected to the resistor R25; An SCR (SCR2) connected between the display device and ground and to which an output signal of an arc defect detector is applied to a control terminal; And A resistor R36 and a capacitor C27 connected in parallel between the control terminal of the SCR SCR2 and ground. Circuit breaker comprising a. The method of claim 40, The display device Circuit breaker that is a light emitting diode. The method of claim 39, The ground fault display unit A display device having an anode terminal connected to the resistor R25; An SCR (SCR3) connected between the display device and ground and to which an output signal of a ground fault detection unit is applied to a control terminal; And A resistor R37 and a capacitor C28 connected in parallel between the control terminal of the SCR SCR3 and ground. Circuit breaker comprising a. The method of claim 42, wherein The display device Circuit breaker that is a light emitting diode. The method of claim 39, The overload display unit A display device having an anode terminal connected to the resistor R25; An SCR (SCR4) connected between the display device and ground and to which an output signal of an overload detector is applied to a control terminal; And A resistor R38 and a capacitor C29 connected in parallel between the control terminal of the SCR SCR4 and ground. Circuit breaker comprising a. The method of claim 44, The display device Circuit breaker that is a light emitting diode. The method of claim 38, A delay unit for temporarily delaying the output signal of the arc fault detection unit, the ground fault detection unit, or the overload detection unit and applying the signal to the arc fault display unit, the ground fault display unit, and the overload display unit, respectively. Circuit breaker further comprising a. 47. The method of claim 46 wherein The delay unit A diode D22 and a resistor R41 connected in series between the arc fault output line and the arc fault indicator; A diode D21 and a resistor R39 connected in series between the ground fault output line and the ground fault indicator; A diode D20 and a resistor R36 connected in series between the overload output line and the overload display unit; And Capacitors C31, C32, and C30 respectively connected between the arc fault output line, the ground fault output line, and the overload output line ground; Circuit breaker comprising a. The method of claim 38, Power control section between the power supply and display section of the trip section Circuit breaker further comprising a. The method of claim 48, The power control unit A capacitor (C26) and a diode (D19) connected in parallel between the power supply's resistor (R7) and ground Circuit breaker comprising a. In the system for detecting the occurrence of arc to control the operation of the circuit, A current converter configured to convert a current change flowing in the conductive line into a voltage; A rectifier for rectifying the voltage of the current converter; A filter unit for outputting high frequency components by removing low frequency components from the rectified voltage; A bias voltage generator configured to generate a bias voltage using the voltage of the filter unit; A reference voltage generator for generating a reference voltage; A voltage comparison unit comparing the output voltage of the filter unit with a reference voltage and outputting a trip signal to cut off the circuit according to the result; And An integrator for feeding back the charged voltage to the voltage comparator when the output signal of the voltage comparator is charged to reach a predetermined level Arc fault protection circuit breaker comprising a. 51. The method of claim 50, The rectifying unit Circuit breaker for arc fault protection, a half-wave rectifier circuit consisting of a diode (D10) and a resistor (R46). 51. The method of claim 50, The filter unit A capacitor C8 connected to the cathode terminal of the rectifier diode D10; A resistor (R15), a diode (D11) and a capacitor (C33) connected in parallel between the capacitor (C8) and ground, respectively; A capacitor C10 connected between the cathode terminal of the diode D11 and the bias voltage generator Arc fault protection circuit breaker comprising a. 51. The method of claim 50, The bias voltage generator A resistor R23 connected between the capacitor portion C10 of the filter portion and ground; A diode (D13) having a cathode terminal connected to a node between the capacitor (C10) and a resistor; A capacitor C19 and a resistor R22 connected in parallel between the anode terminal of the diode D13 and ground, respectively; And A resistor R21 connected between the anode terminal of the diode D13 and a power supply. Arc fault protection circuit breaker comprising a. 51. The method of claim 50, The reference voltage generator A first reference voltage generator providing a first reference voltage for comparison with an output voltage of the filter unit; And A second reference voltage generator providing a reference voltage for comparing with the output voltage of the integrator Arc fault protection circuit breaker comprising a. 55. The method of claim 54, The first reference voltage generator A variable resistor VR1 connected between a power supply and a ground and configured to adjust a voltage applied by the control terminal to the inverting input terminal -IN C of the voltage comparison unit first OP amplifier; And A capacitor C17 connected between the control terminal of the variable resistor VR1 and ground. Arc fault protection circuit breaker comprising a. 55. The method of claim 54, The second reference voltage generator A variable resistor VR2 connected between a power supply and a ground and controlling a voltage applied to the second inverting input terminal -IN D of the voltage comparator through a control terminal; And A capacitor C20 connected between the control terminal of the variable resistor VR2 and ground. Circuit breaker comprising a. 55. The method of claim 50 or 54, The voltage comparison unit A first OP amplifier configured to receive an output voltage of the filter unit through a non-inverting input terminal (+ IN C) and receive a first reference voltage through an inverting input terminal (−IN C); And A second OP amplifier provided with the output voltage of the integrator portion through the non-inverting input terminal (+ IN D) and with the second reference voltage supplied to the Arc fault protection circuit breaker comprising a. 51. The method of claim 50, The integral part A diode D15 having an anode terminal connected to an output terminal OUT C of the voltage comparator first OP amplifier; A resistor (R26) connected between the cathode terminal of the diode (D15) and the non-inverting input terminal (+ IN D) of the voltage comparator second OP amplifier; And A capacitor (C23) and a resistor (R31) connected in parallel between the non-inverting input terminal (+ IN D) and the ground of the second OP amplifier Arc fault protection circuit breaker comprising a. 51. The method of claim 50, A buffer unit connected between the voltage comparator and the integrator, for stably providing the output voltage of the voltage comparator to the integrator The arc fault protection circuit breaker is further provided. The method of claim 59, The buffer unit Capacitor C24 is connected to the emitter terminal, power is applied to the collector terminal, and the base terminal is connected to the output terminal OUT C of the first op amp of the voltage comparator to provide an output signal to the integrator through the collector terminal. Emitter Followers Circuit breaker for arc fault protection. The method of claim 53, The bias voltage generator Voltage comparator The second bias voltage generator for applying a bias voltage to the non-inverting input terminal (+ IN D) of the second OP amplifier The arc fault protection circuit breaker further comprising. 62. The method of claim 61, The bias voltage generator Resistors R24 and R30 connected in series between the power supply and ground; A diode (D14) having an anode terminal connected to a node between the resistor (R24) and a resistor (R30), and a cathode terminal of which is connected to a non-inverting input terminal (+ IN D) of a voltage comparator second OP amplifier; A capacitor C21 connected between the anode terminal of the diode D14 and ground; And A capacitor C22 connected between the cathode terminal of the diode D14 and ground. Arc fault protection circuit breaker comprising a. In a system for detecting an overload and controlling the operation of a circuit accordingly, A current converter configured to detect a load current flowing in the phase conductive line and convert the load current into a voltage; A rectifier for rectifying the voltage of the current converter; A voltage divider configured to limit the voltage rectified in the same phase in the rectifier to a predetermined magnitude; An integrator configured to charge the voltage provided from the voltage divider to a predetermined level; A voltage comparing unit comparing the voltage charged in the integrating unit with a reference voltage to determine whether an overload occurs; A reference voltage generator for generating the reference voltage; And Discharge control unit for discharging the voltage charged in the integrator instantaneously after an overload occurs and the circuit is cut off Overload protection circuit breaker comprising a. The method of claim 63, wherein The rectifying unit A diode (D2) connected to the current converter to rectify the voltage; And A capacitor C2 and a resistor R47 connected in parallel between the cathode terminal of the diode D2 and ground. Overload protection circuit breaker comprising a. The method of claim 63, wherein The voltage divider A resistor R3 connected to the cathode terminal of the rectifier diode D2; A transistor Q1 having power applied to a collector terminal, receiving a voltage rectified through the resistor R3 as a base terminal, and having a capacitor C3 connected between the emitter terminal and ground; And A resistor R6 and a diode D7 connected in parallel between the base terminal of the transistor Q1 and ground, respectively. Overload protection circuit breaker comprising a. The method of claim 63, wherein The integral part A diode D5 connected in series with the emitter terminal of the voltage divider transistor Q1; A resistor R4 connected to the cathode terminal of the diode D5; A capacitor C4 and a resistor R9 connected in parallel between the resistor R4 and ground, respectively; And Resistor R5 and R10 connected in series between the resistor R4 and ground. Overload protection circuit breaker comprising a. 67. The method of claim 63 or 66, The voltage comparison unit OP that receives a non-inverting input terminal (+ IN B) at a node between the resistor R5 and the resistor R10 of the integrator and provides a reference voltage applied from the reference voltage generator to the inverting input terminal (-IN B). Overload protection circuit breaker with amplifier. The method of claim 63, wherein The reference voltage generator A variable resistor VR3 connected between a power supply and a ground and configured to adjust a voltage applied to the inverting input terminal -IN B of the voltage comparator OP amplifier through a control terminal; And A capacitor C15 connected between the control terminal of the variable resistor VR3 and ground. Overload protection circuit breaker comprising a. The method of claim 63, wherein The discharge control unit A first transistor in which the emitter terminal is grounded, the collector terminal is connected to the resistor R100 connected in series with the capacitor C4 of the integrator, and the reset transistor receives the reset signal of the display unit through the resistors R40 and R42 connected in series with the base terminal. (Q4); A second transistor Q5 having an emitter terminal grounded and a collector terminal connected to a node between the resistor R40 and R42; Resistors R43 and R44 connected in series with the base terminal of the second transistor Q5 to provide a set signal of a display unit; And A resistor R45 connected between the node between the resistor R43 and the resistor R44 and ground. Overload protection circuit breaker comprising a. The method of claim 63, wherein A bias voltage generator that provides a bias voltage to the input of the voltage comparator in combination with the overload detection signal of the integral Breaker for overload protection further comprising. The method of claim 70, The bias voltage generator Resistors R2 and R11 connected in series between the power supply and ground; A diode (D6) having an anode terminal connected to a node between the resistor (R2) and a resistor (R11), and a cathode terminal of which is connected to a non-inverting input terminal (+ IN B) of a voltage comparator OP amplifier; And Capacitor C5 connected between the anode terminal of diode D6 and ground Overload protection circuit breaker comprising a. Detecting an arc fault or a ground fault according to a change in current flowing through the phase conductive line and the ground conductive line to which AC power is supplied; Detecting an overload using a change in capacitance according to a current flowing through the conductive line connected to the phase conductive line and the ground conductive line; And Powering down the circuit according to an arc fault or overload Defect detection method comprising a. The method of claim 72, Detecting the arc defect Converting a change in current flowing through the conductive line into a voltage using a CT; Rectifying the converted voltage; A filtering step of removing a low frequency component from the rectified voltage to provide a high frequency component; A reference voltage generation step of generating first and second reference voltages using the filtered voltages; A first comparing step of comparing the filtered voltage with a first reference voltage; A second comparing step of comparing the charged voltage with a second reference voltage when charging the compared signal to reach a predetermined level; And Tripping the circuit in accordance with the signal output in the second comparing step Defect detection method comprising a. The method of claim 72, Detecting the ground fault Converting a difference between a current flowing in the phase conductive line and the ground conductive line of the AC line into a voltage; A ground fault detection step of determining a ground fault occurrence by using the converted voltage; A sensitivity adjusting step of receiving the converted voltage and generating a voltage to adjust a sensitivity of the ground fault protection circuit breaker; And A noise removing step of removing noise from the detected voltage of the current converter and the voltage passing through the sensitivity controller. Defect detection method comprising a. The method of claim 72, Detecting the overload is Detecting and converting a load current flowing in the phase conductive line into a voltage; Rectifying the converted voltage; A voltage distribution step of limiting the rectified voltage to a predetermined magnitude; An integrating step of charging the divided voltage to a predetermined level; Tripping the circuit by comparing the integrated voltage with a reference voltage and disconnecting the circuit according to whether an overload occurs; And Discharge step of discharging the integrated voltage instantaneously after an overload occurs and the circuit is cut off Defect detection method comprising a. The method of claim 72, Display step for displaying to the outside whether the arc fault, ground fault or overload fault occurs The defect detection method further comprising. Converting a change in current flowing through the conductive line into a voltage using a CT; Rectifying the converted voltage; A filtering step of removing a low frequency component from the rectified voltage to provide a high frequency component; A reference voltage generation step of generating first and second reference voltages using the filtered voltages; A first comparing step of comparing the filtered voltage with a first reference voltage; A second comparing step of comparing the charged voltage with a second reference voltage when charging the compared signal to reach a predetermined level; And Tripping the circuit in accordance with the signal output in the second comparing step Arc defect detection method comprising a. Detecting and converting a load current flowing in the phase conductive line into a voltage; Rectifying the converted voltage; A voltage distribution step of limiting the rectified voltage to a predetermined magnitude; An integrating step of charging the divided voltage to a predetermined level; Tripping the circuit by comparing the integrated voltage with a reference voltage and disconnecting the circuit according to whether an overload occurs; And Discharge step of discharging the integrated voltage instantaneously after an overload occurs and the circuit is cut off Overload detection method comprising a.