KR101162252B1 - Versatile circuit breaker for detecting various failure on power lines and loads - Google Patents

Abstract

The power cut-off device of the present invention conducts the first switching element by a high frequency pulse due to an arc on an AC line, charges the first capacitor by using a DC operating voltage while the first switching element is conducting, and the voltage of the first capacitor. An arc detection unit for outputting an arc detection signal when the predetermined level is reached, and a blocking switching element for electrically connecting the AC line and the breaker in accordance with the arc detection signal. The breaker may disconnect the AC line from the load by using the potential of the AC line connected by the blocking switching element.

Description

VERSATILE CIRCUIT BREAKER FOR DETECTING VARIOUS FAILURE ON POWER LINES AND LOADS}

The present invention relates to a power cutoff device, and more particularly, to a device capable of detecting and shutting down various abnormal situations that may occur in an electric line and a load.

When using electrical devices for home or industrial purposes, various abnormalities can occur in the power supply line or in the load. Such abnormal situations are caused by the failure of power line, ground fault, load failure, user error, etc., and various forms such as short circuit, over current of load, arc, short circuit, etc. If you detect a situation, you can respond to such an abnormal situation by shutting off the power supply.

However, the conventional power cut-off device has only a single function for detecting each abnormal situation such as a short circuit of a line, an overcurrent of a load, an arc generation, a short circuit occurrence, and the like, and thus it is often impossible to detect other abnormal situations and prevent electrical disasters. There is a limit to doing so. For example, in the case of a power cut-off device that detects an electric leakage, an electric leakage is commonly known as a cause of a fire, but in reality, a fire may occur due to an electric leakage phenomenon even though it is likely to cause a waste of electric power or an electric shock accident. Since it is small, it is difficult to prevent a fire by the power interruption device which detects an electrical short circuit. An electric fire may be caused by an ignition of surrounding flammable substances by the spark of an arc due to an abnormality of an electric line or an electric equipment, or by overheating due to overcurrent due to an overload through which a large current flows in the load, When a terminal power line to be connected causes a short circuit, it is often caused by overheating caused by acting as a kind of load having a small capacity. However, existing power interrupters that detect arcs or overcurrents do not have the ability to operate to the capacitance of the load, and thus do not detect shorting of fine arcs or terminal power lines.

Furthermore, although arcs cause fires, arcs are easily observed even when the power switch is turned on, plugged in or unplugged. If the arc is detected, the electric power will not be used properly. Therefore, there is a need for a power cut-off device that detects only a continuous arc that can cause a fire while ignoring a short arc that can occur when a user turns the power on or off.

In addition, installing all of the power-off devices having the respective functions is not only a cost problem, but also increases the possibility of error when installing a plurality of power-off devices on one power line. Therefore, there is a need for a power shutdown device incorporating various abnormality detection functions occurring in a load or power line.

The problem to be solved by the present invention is to provide a power interruption device that can detect a continuous arc and a fine arc that can generate a fire.

Another object of the present invention is to provide a power interruption device incorporating a function capable of detecting various abnormal conditions that may occur in a load or a power line.

Power cut device according to an aspect of the present invention

Conducts the first switching element by a high frequency pulse due to an arc on the AC line, charges the first capacitor using a direct current operating voltage while the first switching element is conducting, and the voltage of the first capacitor reaches a predetermined level. An arc detector for outputting an arc detection signal as early as possible;

A blocking switching element electrically connecting the AC line and the blocking unit according to the arc detection signal; And

It may include a breaker for disconnecting the AC line with the load by using the potential of the AC line connected by the blocking switching element.

According to one embodiment, the arc detection unit

A high frequency pulse detection circuit configured to receive a high frequency pulse due to an arc from a first coil and conduct the first switching element by a current flowing through a second coil in which electromotive force by the first coil is induced; And

A delay circuit may be included to smooth the direct current operating voltage and charge the first capacitor by a current corresponding to at least a portion of the smoothed direct current operating voltage while the first switching device is in a conductive state.

According to one embodiment, the high frequency pulse detection circuit is

Two diodes each having an anode connected to each of the AC lines and a cathode connected in common; And

And a transformer wired to induce a voltage to the second coil when a high frequency pulse is transmitted from the common connected cathode of the diode to the first coil.

The first switching element may be connected to be conductive by a voltage induced in the second coil of the transformer.

According to one embodiment, the arc detection unit

By biasing the first switching element to operate in a saturation state, a switching element saturation capable of conducting the first switching element even when a high frequency pulse due to a fine arc that otherwise would not conduct the first switching element is applied. The circuit may further include.

According to an embodiment, when the arc detection signal is applied to a control terminal, the cutoff switching element may operate to conduct a connection between a connection terminal connected to the AC line and a connection terminal connected to the blocking unit.

According to one embodiment, further comprising a direct current operating voltage generation unit for providing a rectified voltage rectified AC of the AC line as the direct current operating voltage,

The DC operation voltage generator may provide a potential of an intermediate connection point of two capacitors connected in series between the AC lines as a ground potential of the power cutoff device.

According to one embodiment,
The direct current voltage generator further includes a capacitor charged by the rectified voltage,
The DC operation voltage generator may operate to supply at least one of the rectified voltage and the charged voltage of the capacitor as the DC operation voltage.

According to one embodiment, a high frequency noise filter inserted in series on the input side or the load side of the AC line; And

It may further include a surge absorption element and a capacitor connected in parallel to the load side of the AC line.

According to one embodiment, the arc detector,

The electronic device may further include a test circuit configured to conduct the first switching device by applying the DC operation voltage to the first switching device through a button switch.

According to one embodiment, the power off device,

A current transformer capable of sensing a magnitude of current flowing in one of the AC lines;

A variable resistor generating a sense voltage proportional to the magnitude of the current sensed by the current transformer according to the size of a variable resistor; And

And a third switching device which outputs an overcurrent detection signal when the sensing voltage is conducted.

The blocking switching device may be operable to electrically connect the AC line and the blocking unit according to the overcurrent detection signal.

According to one embodiment, the power off device,

An image current transformer capable of detecting a difference in an AC current flowing through the AC line;

And a fourth switching element which outputs an electric leakage detecting signal when the electric current is conducted by a sensing voltage proportional to the difference of the AC current due to the electric leakage.

The blocking switching device may be operable to electrically connect the AC line and the blocking unit according to the ground fault detection signal.

According to one embodiment, the power off device,

The display device may further include a display lamp that emits light when the arc detection signal, the overcurrent detection signal, or the ground fault detection signal occurs.

According to the power cut device of the present invention, a fire caused by spark, arc, overload and overheating which may occur due to abnormal conditions of electric wires and electrical appliances, that is, poor connection, short circuit due to short circuit, short circuit, poor connection, overload, etc.) Disasters such as electric shocks caused by short circuits can be prevented with a single power off device.

In particular, it can also detect fine arcs that can occur inside electrical appliances.

1 is a block diagram illustrating a power off device according to an embodiment of the present invention.
2 is a circuit diagram illustrating an arc detector and a DC operation voltage generator according to an embodiment of the present invention.
3 is a circuit diagram illustrating an overload detector according to an embodiment of the present invention.
4 is a circuit diagram illustrating a short circuit detecting unit according to an exemplary embodiment of the present invention.
5 is a circuit diagram illustrating a blocking switching device and a blocking unit according to an exemplary embodiment of the present invention.
6 is a circuit diagram specifically illustrating a power interruption device according to an embodiment of the present invention.

For the embodiments of the invention disclosed herein, specific structural and functional descriptions are set forth for the purpose of describing an embodiment of the invention only, and it is to be understood that the embodiments of the invention may be practiced in various forms, The present invention should not be construed as limited to the embodiments described in Figs.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

1 is a block diagram illustrating a power off device according to an embodiment of the present invention.

Referring to FIG. 1, the power cutoff device 10 includes an arc detector 11 that detects whether an AC power line AC1 or AC2 or a load LOAD is generated, and an overload detector that detects an overload condition such as an overcurrent and a short circuit. (12), a ground fault detecting unit 13 for detecting a ground fault state, a shut-off switching element 14 energized at the time of detection of an abnormal state, a breaker 15 for interrupting the energized state of an AC power line, and a DC operating voltage The direct current voltage generator 16 and the display unit 17 may be included.

The arc detector 11 receives an AC voltage signal from two AC power lines AC1 and AC2, respectively. If a high frequency pulse current is generated in the AC voltage signal due to the arc generated in the AC power line or the load, the arc detector 11 may detect the high frequency pulse current component from the two AC power lines. Arcs can occur momentarily when plugged in or unplugged, or when the power switch is turned on and off, and micro arcs can occur continuously within a few seconds under electrical loads or line faults. There is no need to turn it off or cut off, but in the latter case the power should be cut off as there is a danger of fire.

The arc detector 11 detects a high frequency pulse current and outputs an arc detection signal when the detected high frequency pulse lasts for a predetermined time or more. To this end, the arc detector 11 includes a high frequency pulse detection circuit 111, a delay circuit 112, and a filter 113. The filter 113 is connected between the AC power line and the high frequency pulse detection circuit 111 to remove the operation noise of the load mixed with the AC current and to pass the high frequency pulse according to the arc generation. The high frequency pulse detection circuit 111 charges the capacitor 1121 in the delay circuit 112 by the direct current operating voltage whenever a high frequency pulse passing through the filter 113 is applied. The delay circuit 112 generates an arc detection signal capable of conducting the blocking switching element 14 when a high frequency pulse is applied several times and the voltage level of the capacitor 1121 due to the charging of the DC operating voltage exceeds a predetermined threshold. Create

At this time, when one or two short arcs occur, the delay circuit 112 does not generate an arc detection signal because the charging voltage level of the capacitor 1121 is insufficient to generate the arc detection signal, and no arc is generated anymore. Otherwise it is configured to discharge little by little over time.

In this way, the arc detector 11 can accurately detect a continuous arc with a high risk of actual fire while ignoring one or two instantaneous or artificial arcs that are not at high risk.

The arc detection signal output from the arc detection unit 11 conducts the cutoff switching element 14, and the cutoff unit 15 electrically disconnects the AC power line by the conducted cutoff switching element 14.

On the other hand, the arc detector 11 may further include a test switch 114 that can test whether the power off according to the arc detection occurs. When the user presses the test switch 114, the test switch 114 substitutes the DC operating voltage generated by the DC operating voltage generator 16 into the delay circuit 112 in place of the output of the high frequency pulse detection circuit 112. Is authorized. While the user presses the test switch 114 for several seconds to mimic the occurrence of a high-risk arc, the capacitor 1121 of the delay circuit 112 is charged to generate an arc detection signal, and the blocking switching element 14 ) Is turned on and the breaker 15 electrically disconnects the AC power line. On the other hand, if the user presses the test switch 114 very short, for example within 1 second, the capacitor 1121 of the delay circuit 112 will not be charged for a sufficient time, so no arc detection signal is generated, No power cut will occur.

Next, the overload detection unit 12 uses a current transformer 121 attached to one of the AC lines, so that when the amount of power consumed by the load increases, the current flows to the current transformer 121 by the current flowing to the load side. When the induced voltage is sensed to rise, the overload detection signal is generated when the induced voltage of the current transformer 121 exceeds a predetermined threshold. According to the power consumption of the load, a threshold value, which is a reference for generating an overload detection signal, may be changed to a variable resistor connected in parallel to both output terminals of the current transformer 121.

The overload detection signal output from the overload detection unit 12 conducts the interruption switching element 14, and the interruption unit 15 electrically disconnects the AC power line by the conduction interruption switching element 14.

Subsequently, the ground fault detector 13 uses a zero-phase current transformer 131 wound around the entire AC line, so that when a short circuit occurs in one of the two AC lines, a potential difference between the two AC lines is applied. By detecting the electromotive force induced by the image current transformer 131, and generates an electric leakage detection signal when the electromotive force induced by the image current transformer 131 exceeds a predetermined threshold value.

The ground fault detection signal output from the ground fault detection unit 13 conducts the interruption switching element 14, and the interruption unit 15 electrically disconnects the AC power line by the conduction interruption switching element 14.

The cutoff switching element 14 is conducted by any one of an arc detection signal, an overload detection signal, and a ground fault detection signal.

In one embodiment, the interruption switching element 14 may electrically connect the interruption unit 15 to an AC line so as to provide sufficient energy for the disconnection operation to the interruption unit 15. In this case, the blocking unit 15 may use a solenoid coil switch for a sure blocking operation.

The DC operating voltage generator 16 for supplying the DC operating voltage is connected to an AC line to rectify the AC power, and the DC operating voltage required by the arc detector 11, the overload detector 12, and the earth leakage detector 13 may be adjusted. It can provide a local ground voltage. In this case, the local ground voltage may use the potential of the middle tap of the two capacitors connected in series between the two AC lines.

In one embodiment, the DC operation voltage supplied by the DC operation voltage generation unit 16 is connected to be applied to the delay circuit 112, so that the capacitor of the delay circuit 112 under the control of the high frequency pulse detection circuit 111 ( 1121 may be charged. Also in one embodiment, the direct current operating voltage can be wired to be applied to the delay circuit 112 while the test switch 114 is pressed, thereby charging the capacitor 1121 of the delay circuit 112.

The display unit 17 is a state in which the power cut-off device 10 normally waits, so that the DC operating voltage generator 16 can indicate that the DC operating voltage can be supplied to each of the detection units 11, 12, and 13 at any time. The first lamp 171 that emits light at all times by the direct current operating voltage of the " ) May be included. The first to fourth lamps 171, 172, 173, and 174 may be light emitting diodes (LEDs).

In addition, the arc detection unit is preferably configured to protect the circuit by being disconnected from the power supply by the fuse (FUSE) when a problem occurs in the arc detection unit is connected to the fuse (FUSE).

Next, the circuit of each detection part is explained in full detail.

2 is a circuit diagram illustrating an arc detector and a DC operation voltage generator according to an embodiment of the present invention.

1 and 2 together, first, the DC operating voltage generator 16 limits two capacitors C1 and C2 and two half-wave rectifying diodes D2 and D4 and current connected in parallel to two AC lines. It may include a resistor (R2) to protect the circuit. The half-wave rectifying diodes D2 and D4 of the DC operating voltage generator 16 rectify AC power to generate a DC operating voltage. The middle tap of the two capacitors C1 and C2 provides a local ground potential for the power disconnect device 10.

Meanwhile, the DC operation voltage generator 16 may further include a capacitor C13. The capacitor C13 is normally charged through the resistor R14, and may provide a DC operating voltage to the detection units 11, 12, and 13 of the power cutoff circuit 10. Thus, when the voltage drop suddenly occurs due to a loss current on the AC line due to an unexpected short circuit or short circuit of the AC line, the supply of the DC operating voltage through the half-wave rectifying diodes D2 and D4 is stopped. This prevents them from playing a role and consequently prevents them from performing a power-off operation in the event of a short or short circuit.

The arc detector 11 includes a filter 113 connected in parallel to two AC lines, a high frequency pulse detection circuit 111 for detecting a high frequency pulse due to an arc from an AC signal whose noise is filtered by the filter 113, and a delay circuit. 112, and may further include a test circuit 114 and a switching element saturation circuit 115.

The filter 113 may be composed of a plurality of capacitors CS and inductors L1 and L2 connected in parallel or in series to an AC line, respectively. The AC line may be affected by harmonic components of AC frequency, noise generated when the load electrical equipment is operated, and noise caused by strong electromagnetic induction that may occur when using surrounding electronic equipment. These noises can be eliminated through. By inserting the capacitors CS and the inductors L1 and L2 at both ends of the input side of the AC line or at both ends of the load side, the high frequency surge generated at the load side is prevented from propagating to the input grid. On the input side, it is possible to prevent the power cutoff device 10 from being damaged by an external high frequency surge.

On the other hand, the filter 113 is a type of non-linear variable resistor (TNR) connected in parallel to the AC line to absorb the strong surge transmitted from the outside and TNR is a trade name). Capacitor C3 may be further included.

However, the filter constant of the filter 113 should be determined so as not to attenuate the high frequency pulse component of 2MHz or more due to arc generation. When an arc occurs on a load or on a line, it typically occurs as a pulse signal with frequency components from a few kHz to several GHz. The high frequency pulse current signal propagates through the AC line and is applied to the high frequency pulse detection circuit 111 through the high speed switching diodes DS1 and DS2.

The fast switching diodes DS1 and DS2 for detecting high frequency pulses of the arc have anodes connected to the AC line side and cathodes connected in common, and when combined with the diode D4, full-wave rectified broadband Configure a frequency multiplication circuit. When the high frequency pulse current of the arc passes through the fast switching diodes DS1 and DS2, the low frequency band does not pass and passes only the high frequency band above the reverse stop frequency range of the fast switching diodes DS1 and DS2. This leaves only high frequency components above a few MHz. Accordingly, noise components on the order of several kHz to thousands of kHz, which may occur due to the use of the load, are excluded from the arc detection, and the malfunction of the power disconnect device 10 can be minimized.

When such a high frequency pulse passes through the capacitor C5 and is applied to the first coil L3 of the transformer T1, a high frequency voltage is induced in the second coil L5 of the transformer T1. The induced high frequency voltage is applied to the control terminal 2 of the first switching element Q1 through the diode D3 and conducts the first switching element Q1 to connect the connection terminals 1 and 3. When the arc disappears and the high frequency pulse disappears, since there is no pulse current applied to the transformer T1, the first switching element Q1 is inactivated again.

In this way, when the first switching element Q1 is turned on while the high frequency pulse is generated due to the arc generation, the capacitors C7 and C9 of the delay circuit 112 and the diode D2 of the DC operation voltage generator 16 and A current path is formed through the two terminals 1 and 3 of the first switching element to the diode D4 of the DC operation voltage generator 16, and the capacitor of the delay circuit 112 is formed by the DC operation voltage through the current path. C7 and C9 are charged at a rate determined by the size of the resistors R2, R6, R7, and R8.

The resistors R6 and R7 connected in parallel to the capacitors C7 and C9 are discharge resistors for the capacitors C7 and C9, respectively. In particular, resistor R6 protects capacitor C7 by preventing overcharging of capacitor C7 and discharging residual charge, while also providing a current path for charging capacitor C8 of switching element saturation circuit 115. Sometimes. The resistor R7 determines the charging speed of the capacitor C9 and discharges the capacitor C9 after charging.

If the arc is generated momentarily by the on / off of the power switch or the insertion and ejection operation of the plug, the capacitor C9 may not be charged for a sufficient time. When the charge is over, the capacitor C9 may be connected to the resistors R6, R7, and R8. Discharged. Therefore, since the arc detection signal is not generated, it is possible to prevent the malfunction of the power cutoff device 10.

However, if the arc is a high risk of fire from a load or AC line, it can last for a few seconds and can sufficiently charge the capacitor (C9). When the capacitor C9 is sufficiently charged, the zener diode D5 conducts due to the voltage drop occupied by the capacitor C9, and the arc detection signal is output through the backflow suppression diode D6 connected in series with the zener diode D5. .

The arc detection signal is input to the cutoff switching element 14. When the arc detection signal is applied to the control terminal 1, the second switching element Q2 constituting the cutoff switching element 14 is electrically connected, and the connection terminals 2 and 3 are connected to connect the AC line and the breaker 15. The resistor R9 prevents overcurrent from flowing through the second switching element Q2.

On the other hand, even a small arc may be a problem in the case of sustaining. If the first switching element Q1 to be implemented as a transistor is not conducted by the voltage applied from the transformer T1 by the micro arc, the micro arc may be a problem. May not be detected. To prevent this, switching element saturation circuit 115 may be added. The capacitor C8 of the switching element saturation circuit 115 is charged during normal normal operation such that the first switching element Q1 is weakly saturated and flows extremely fine current between the two connection terminals. The element Q1 is biased. Accordingly, the first switching element Q1 may be connected to the fine arc to charge the capacitors C7 and C9 of the delay circuit 112 by the DC operating voltage.

Next, the test circuit 114 presses the button switch SW2 to artificially apply a predetermined voltage to the control terminal 2 of the first switching element Q1 to conduct the first switching element Q1 so as to conduct the delay circuit ( The capacitors C7 and C9 of the 112 are charged by the direct current operating voltage, thereby testing whether the arc detection signal is generated and further the operation of the interrupter 15. The resistor R4 is a device for lowering the voltage applied to the control terminal 2 of the first switching element Q1 to an appropriate level through the voltage drop of the resistor R4 when the button switch SW2 is pressed.

3 is a circuit diagram illustrating an overload detector according to an embodiment of the present invention.

Referring to FIG. 3, the overload detection unit 12 uses electromotive force induced at both ends of the current transformer CT1 installed at one of the AC lines. When the amount of power consumed on the load side increases or a short circuit occurs in the line, the current flowing in the AC line increases and the magnitude of the AC current induced in the current transformer CT1 also increases. When the variable resistor VR1 is connected in parallel to both output terminals of the current transformer CT1, an AC voltage corresponding to the magnitude of the AC current induced in the current transformer CT1 is applied across the variable resistor VR1.

The organic alternating voltage across the variable resistor VR1 is converted into direct current by the bridge diode BD1 and applied to the control terminal 2 of the third switching element Q3. By adjusting the variable resistor of the variable resistor VR1 according to the capacity of the load or the power capacity of the AC line, the threshold for judging overload can be adjusted.

Usually, since the induced voltage across the variable resistor VR1 is lower than the overload threshold, the third switching element Q3 is inactive and the capacitor C13 is also fully charged. When a large current flows in an alternating current line unexpectedly, the induced voltage across the variable resistor VR1 becomes larger than the overload threshold value, and the third switching element Q3 is turned on by the voltage converted by the bridge diode BD1. Two connection terminals 1 and 3 of the third switching element Q3 are connected to each other, and the charge charged in the capacitor C13 flows through the resistor R11 and the backflow prevention diode D7 to output an overload detection signal.

The overload detection signal is input to the cutoff switching element 14. When the overload detection signal is applied to the control terminal 1, the second switching element Q2 constituting the cutoff switching element 14 is turned on, and the connection terminals 2 and 3 are connected to each other to connect one of the AC lines and the breaker 15. Connect

4 is a circuit diagram illustrating a short circuit detecting unit according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the ground fault detecting unit 13 uses electromotive force induced by the image current transformer CT2 mounted in a wound state covering both AC lines.

AC power is transmitted through the substation and transformer while the ground is grounded, and there is always a potential difference between the line and the ground. In this state, when a state where energization is possible between the AC line and the ground occurs, current leaks. If leakage current flows into a resistive conductor (an object that generates heat or carbonizes while a current flows, such as a human body or water), it may cause an electric shock or a fire accident.

Since the two AC lines pass through the windings of the image current transformer CT2 together, no electromotive force is generated in the image current transformer CT2 while current flows normally in both AC lines. However, when a short circuit occurs in one AC line, the magnitude of the current flowing in the AC line and the current flowing in the other AC line is different, and the current transformer CT2 is induced with a predetermined AC voltage.

The induced alternating voltage is applied to the bridge diode BD2, converted to a direct current voltage, filtered through the capacitor C11, and then applied to the control terminal 2 of the fourth switching element Q4. Accordingly, two connection terminals 1 and 3 of the fourth switching element Q4 are connected to each other, and a charge charged in the capacitor C13 flows through the resistor R12 and the backflow prevention diode D8 to output an earth leakage detection signal.

The ground fault detection signal is input to the cutoff switching element 14. The second switching element Q2, which implements the cutoff switching element 14, is turned on when the earth leakage detection signal is applied to the control terminal 1, and connects one of the AC lines and the breaker 15 while the connection terminals 2 and 3 are connected. Let's do it.

5 is a circuit diagram specifically illustrating a blocking switching device and a blocking unit according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the second switching element Q2 constituting the blocking switching element 14 receives an arc detection signal, an overcurrent detection signal, and an earth leakage detection signal that are respectively applied through the backflow prevention diodes D6, D7, and D8. Received at control terminal 1.

The connection terminal 2 of the second switching element Q2 which is normally inactive is connected to the DC operating voltage output from the diode D2, and the connection terminal 3 is connected to the AC line, which is an arc detection signal and an overcurrent detection. When a signal or an earth leakage detection signal is applied, current flows through the control terminal 1 to conduct the second switching element Q2, and the connection terminals 2 and 3 are connected to each other. At this time, the AC voltage of the connection terminal 3 of the second switching element Q2 is applied to the bridge diode BD3 through the connection terminal 2 and the resistor R10.

On the other hand, when a short circuit and a short circuit occur in the AC line and the DC operating voltage is not properly supplied from the diode D2, the voltage charged to the capacitor C13 is supplied by the voltage of the connection terminal 2 of the second switching element Q2. Thus, when the detection signal is applied to the control terminal 1, the second switching element Q2 can be turned on.

When the connection terminals 2 and 3 are connected by the conduction of the second switching element Q2, the voltage of the AC line applied to the connection terminal 3 is transmitted to the connection terminal 2, and then to the bridge diode BD3 through the resistor R10. Is approved.

The bridge diode BD3 applies the DC voltage obtained by rectifying the applied AC voltage to the solenoid coil L6 constituting the breaker 15. The solenoid coil L6 forms a strong magnetic field in the magnetic body that operates the switch SW1 when a direct current voltage is applied, thereby causing the magnetic body to physically disconnect the AC line by moving the switch SW1.

6 is a circuit diagram specifically illustrating a power interruption device according to an embodiment of the present invention.

Referring to FIG. 1 and FIG. 6, the power cutoff device 10 includes a breaker including an AC conduction line AC1 and AC2, a switch SW1, a solenoid coil L6, and a bridge diode BD3 at the far left side. (15) is shown.

On the right side of the blocking unit 15, a filter unit 113 including capacitors CS, inductors L1 and L2, a nonlinear resistor TNR, and a surge suppression capacitor C3, and a DC operating voltage. DC operating voltage generator 16 including half-wave rectifying diodes D2 and D4 and current limiting resistor R2, fast switching diodes DS1 and DS2, filtering capacitor C5, and first coil L3. A high frequency pulse detection circuit 111 including an oscillation transformer T1, a switching diode D3, and a first switching element Q1 in which an electromotive force is induced in the second coil L5 by a high frequency pulse due to an arc applied to And the capacitors C7 and C9 for charging the DC operating voltage, the resistors R6, R7, and R8 for determining the charging speed and discharging after charging, and the zener diode D5 when the first switching element Q1 is turned on. Delay circuit 112 is shown that includes. When the charging voltage of the capacitor C9 is greater than the predetermined threshold voltage, the zener diode D5 is turned on, and an arc detection signal is output through the backflow prevention diode D6.

A resistor R5 and a capacitor C8 of the switching element saturation circuit 115 for biasing the first switching element Q1 to operate in a saturation state are connected to the first switching element Q1.

Below the delay circuit 112 is a capacitor C13 and a resistor R14 charged with a direct current operating voltage.

The load-side AC line includes an overcurrent detector 12 using a current transformer CT1 attached to one of the AC lines. The bridge diode BD1 converts the voltage induced in the image current transformer CT1 into a direct current voltage by a short circuit and applies it to the third switching element Q3. When the third switching element Q3 is turned on, the overcurrent detection signal is outputted through the backflow prevention diode D7 through the direct current operating voltage charged in the capacitor C13.

The load-side AC line also has a ground fault detection unit 13 using an image current transformer CT2 that covers all of the AC lines. The bridge diode BD2 in the image current transformer CT2 converts the voltage induced by the overcurrent into a DC voltage and applies it to the fourth switching element Q4. When the fourth switching element Q4 is turned on, a short circuit detection signal is outputted through the backflow prevention diode D8 to the DC operating voltage charged in the capacitor C13.

The arc detection signal, the overcurrent detection signal, and the earth leakage detection signal are all applied to the control terminal of the second switching element Q2 constituting the cutoff switching element 14 to conduct the second switching element Q2. An AC voltage of one of the AC lines is applied to the bridge diode DB3 of the breaker 15 through the resistor R10 by the conductive second switching element Q2.

The first lamp LED is connected in series with the resistor R1 between the AC line AC1 and the cathode of the rectifier diode D2 to emit light when a DC operating voltage is normally generated from the AC lines AC1 and AC2. . The second lamp LED1 indicates whether an arc detection signal is generated using the voltage between the zener diode D5 of the delay circuit 112 and the capacitor C13. The third lamp LED2 indicates whether an overcurrent detection signal has occurred using the voltage between the output resistor R11 of the third switching element Q3 and the capacitor C13. The fourth lamp LED3 indicates whether a ground fault detection signal is generated using the voltage between the output resistor R12 and the capacitor C13 of the fourth switching element Q4.

A fuse FUSE is inserted between the power circuit breaker circuits between the AC lines to protect the power circuit breaker 10.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications will fall within the scope of the invention.

11 arc detector
12 Overcurrent detector
13 earth leakage detector
14 blocking switching elements
15 blocking
16 DC operation voltage generator
17 Display

Claims (12)

Conducts the first switching element by a high frequency pulse due to an arc on the AC line, charges the first capacitor using a direct current operating voltage while the first switching element is conducting, and the voltage of the first capacitor reaches a predetermined level. An arc detector for outputting an arc detection signal as early as possible;
A blocking switching element electrically connecting the AC line and the blocking unit according to the arc detection signal; And
A breaker for disconnecting the AC line from the load by using the potential of the AC line connected by the blocking switching element,
The arc detector,
A high frequency pulse detection circuit configured to receive a high frequency pulse due to an arc from a first coil and conduct the first switching element by a current flowing through a second coil in which electromotive force by the first coil is induced; And
And a delay circuit for smoothing the direct current operating voltage and charging the first capacitor by a current corresponding to at least a portion of the smoothed direct current operating voltage while the first switching element is conducting. Blocking device. delete The method of claim 1, wherein the high frequency pulse detection circuit
Two diodes each having an anode connected to each of the AC lines and a cathode connected in common; And
And a transformer wired to induce a voltage to the second coil when a high frequency pulse is transmitted from the common connected cathode of the diode to the first coil.
And the first switching element is electrically connected to the second coil of the transformer by the induced voltage. The method of claim 1, wherein the arc detection unit
By biasing the first switching element to operate in a saturation state, a switching element saturation capable of conducting the first switching element even when a high frequency pulse due to a fine arc that otherwise would not conduct the first switching element is applied. A power off device further comprising a circuit. The power cut-off device according to claim 1, wherein the cutoff switching element operates to conduct a connection between a connection terminal connected to the AC line and a connection terminal connected to the cutoff unit when the arc detection signal is applied to a control terminal. . The method according to claim 1, further comprising a direct current operating voltage generator for providing a rectified voltage rectified by the alternating current of the AC line as the direct current operating voltage,
And the DC operation voltage generation unit provides a potential of an intermediate connection point of two capacitors connected in series between the AC lines as a ground potential of the power disconnect device. The method of claim 6, wherein the DC operation voltage generation unit further comprises a capacitor charged by the rectified voltage,
And the DC operation voltage generator is configured to supply at least one of the rectified voltage and the charged voltage of the capacitor as the DC operation voltage. 2. The apparatus of claim 1, further comprising: a high frequency noise filter inserted in series at an input side or a load side of the AC line; And
And a surge absorbing element and a capacitor connected in parallel to the load side of the AC line. The method according to claim 1, wherein the arc detector,
And a test circuit for conducting the first switching element by applying the direct current operating voltage to the first switching element through a button switch. The method according to claim 1,
A current transformer capable of sensing a magnitude of current flowing in one of the AC lines;
A variable resistor generating a sense voltage proportional to the magnitude of the current sensed by the current transformer according to the size of a variable resistor; And
And a third switching device which outputs an overcurrent detection signal when the sensing voltage is conducted.
And the cutoff switching element is operable to connect the AC line with the cutout according to the overcurrent detection signal. The method of claim 10,
An image current transformer capable of detecting a difference in an AC current flowing through the AC line;
And a fourth switching element which outputs an electric leakage detecting signal when the electric current is conducted by a sensing voltage proportional to the difference of the AC current due to the electric leakage.
And the cutoff switching element is operable to connect the AC line with the cutout according to the ground fault detection signal. The method of claim 11,
And a display lamp which emits light when the arc detection signal, the overcurrent detection signal, or the earth leakage detection signal is generated.

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