KR100929499B1 - Power cutoff device with automatic recovery - Google Patents

Abstract

The present invention relates to a power interruption device having an automatic recovery function. An automatic power cut device of the present invention comprises a power breaker; Residual current removal unit for removing the residual current of the load; A short circuit detecting unit for monitoring a short circuit of a load; Short circuit detection unit for monitoring the short circuit of the load; And removing the residual current remaining in the load by controlling the residual current removing unit, and then controlling the short circuit detecting unit to detect the short circuit of the load and returning the power breaker only when there is no short circuit, and controlling the ground fault detecting unit to control the leakage current. It is configured to include; a central processing unit for detecting the short circuit to return the power breaker only when there is no short circuit. Therefore, after the power is shut off, the cause of the short circuit and the short circuit may be detected, and the circuit breaker may be automatically returned after the cause is removed.

breaker

Description

Power interrupter with automatic recovery function {CIRCUIT BREAKER HAVING AUTOMATIC RECOVERY FUNCTION}

1 to 6c illustrate the structure of an embodiment of the present invention.

1 is a block diagram of an automatic power cut device of the present invention

FIG. 2 is a flowchart illustrating a control step of the CPU of FIG. 1.

3 is a conceptual diagram illustrating a method of determining the ground discriminating unit of FIG. 1;

4 is a circuit diagram of a residual current removing unit of FIG. 1.

5A is a circuit diagram of the earth leakage detecting unit of FIG. 1.

FIG. 5B is a circuit diagram of the ground fault detecting unit of FIG. 5A modeling a grounded state. FIG.

FIG. 5C is a circuit diagram of the ground fault detecting unit of FIG. 5A without a short circuit. FIG.

6A is a circuit diagram of the short circuit detection unit of FIG. 1.

FIG. 6B is a circuit diagram of the short circuit detecting unit of FIG. 6A modeling a shorted state. FIG.

FIG. 6C is a circuit diagram of the short circuit detecting unit of FIG. 6A in a short circuit state. FIG.

** Description of the symbols for the main parts of the drawings **

10: power breaker 11: first power line

12: second power line 20: central processing unit

30: ground discriminating unit 40: residual current removing unit

50: short circuit detection unit 60: short circuit detection unit                 

70: display unit 70a: earth leakage display unit

70b: short circuit indicator

The present invention relates to a power breaker, and more particularly, to an automatic power cutoff device capable of accurately determining whether a short circuit or a short circuit occurs after a power cutoff.

A circuit breaker refers to an electric device that connects and disconnects an electric circuit, and is a device that cuts off a fault current flowing when a load current flowing through the electric circuit and a short circuit or ground fault occur.

The conventional circuit breaker is configured in such a manner that when a fault current occurs, the user cuts the circuit breaker and then directly operates the circuit breaker to apply power to the load. However, this method has a disadvantage in that it is difficult to apply when the breaker is installed in a location that can not be easily reached by the user.

As a solution to these shortcomings, a circuit breaker has been developed to automatically return the circuit breaker.However, the circuit breaker is operated again after the return due to the inability to pinpoint the cause of a short circuit or short circuit. It may cause.

The present invention has been made to solve the above problems, an object of the present invention is to provide an automatic power cutoff device that can accurately determine the cause of the interruption, such as short circuit and short circuit after power off.

The present invention, in order to achieve the object as described above, the power circuit breaker; Residual current removal unit for removing the residual current of the load; A short circuit detecting unit for monitoring a short circuit of a load; And after receiving a circuit breaker operation signal from the power circuit breaker, controlling the residual current removing unit to remove the residual current remaining in the load, and controlling the short circuit detecting unit to detect whether the load is short-circuited and there is no short circuit. Provides an automatic power cut off device comprising a; central processing unit for returning. Therefore, it is possible to accurately know whether or not a short circuit is detected, which ensures quick troubleshooting and automatic return.

The apparatus may further include a short circuit detecting unit configured to monitor whether the load is shorted, and the central processing unit controls the residual current removing unit to remove residual current remaining in the load, and then controls the short circuit detecting unit to short-circuit the load. It is advisable to return the power breaker only if there is no short circuit by detecting. Therefore, the short circuit can be known more accurately.

Here, the ground determination unit for determining whether the ground; Further, the central processing unit is effective to control the residual current removing unit after determining the suitability of the ground by controlling the ground discriminating unit.

And a ground fault display unit for receiving a signal from the ground fault detection unit to display a ground fault. And a short circuit display unit for receiving a signal from the short circuit detection unit and displaying a short circuit. Therefore, it is easy to know whether there is a short circuit or short circuit at the time of repair, making it easy to troubleshoot and reduce the psychological burden.

On the other hand, according to another field of the present invention, a first step of determining whether the breaker is operating; A second step of removing residual current in a power line of a load when the breaker is operated in the first step; Inspecting whether the load is shorted after the second step; And returning a circuit breaker when a short circuit has not occurred in the checking of the short circuit. Provided is an automatic power breaker control method comprising a.

Here, after the second step of checking the short circuit of the load; And returning a circuit breaker if a short circuit has not occurred in the checking of the short circuit.

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

However, in describing the present invention, a detailed description of known functions or configurations will be omitted in order not to disturb the gist of the present invention.

1 to 6c show the structure of one embodiment of the present invention, FIG. 1 is a block diagram of an automatic power shut-off device of the present invention, and FIG. 2 is a flow chart showing a control step of the central processing unit of FIG. 3 is a conceptual diagram illustrating a method of determining the ground discriminating unit of FIG. 1, FIG. 4 is a circuit diagram of the residual current removing unit of FIG. 1, FIG. 5A is a circuit diagram of the earth leakage detecting unit of FIG. 1, and FIG. 5B is a model of a shorted state. 5C is a circuit diagram of the short circuit detecting unit of FIG. 5A without a short circuit, FIG. 6A is a circuit diagram of the short circuit detecting unit of FIG. 1, and FIG. 6B is a circuit diagram of the short circuit detecting unit of FIG. 6A modeling a shorted state. 6C is a circuit diagram of the short circuit detecting unit of FIG. 6A in a short circuit state.

As shown in these figures, the automatic power cut-off device of the embodiment of the present invention removes the power circuit breaker 10 that cuts the power, the ground discrimination unit 30 that determines whether the ground, and the residual current remaining in the load The residual current removing unit 40, the ground fault detecting unit 50 for determining whether the load is short-circuited, the short circuit detecting unit 60 for determining whether the load is short-circuited, and whether the short circuit and short circuit are externally displayed Central processing to control the display unit 70, the power circuit breaker 10, the ground discrimination unit 30, the residual current removing unit 40, the ground fault detecting unit 50, the short circuit detecting unit 60 and the display unit 70 Device 20.

The power circuit breaker 10 uses a conventional power circuit breaker. In addition, an opening and closing switch relay (not shown) for operating the opening and closing switch 14 is further provided to open and close the power circuit breaker 10 in the central processing unit 20.

In the ground discrimination unit 30, the ground discrimination method determines whether the ground line is indirectly grounded by a voltage difference. Two strands of power are used in homes. In FIG. 3, the voltage Vs denotes a power supply voltage, and the voltages V1 and V2 occur when the ground line 13 and the voltage of one terminal 11 or 12 of the power supply are checked.

In general, the values of V1 and V2 are different. When V1 is larger than V2, the value of V1 is close to Vs, and the value of V2 is close to zero. Thus, when the value of V2 appears close to zero, we know that ground is the correct ground.

3 is an example of determining the ground in a single-phase power source. Alternatively, the ground line may be determined using a voltage between the ground line and the power terminal in the multi-phase power source, and thus a method of determining the ground line may be variously implemented.

The residual current removing unit 40 includes a first ground line 41 connecting the first power line 11 connected to the circuit breaker and a ground 13, and a second connecting line connecting the second power line 12 and the ground 13. 2 ground wire 42, the first switch 43 for opening and closing the first ground wire 41, the second switch 44 for opening and closing the second ground wire 42, and the signal from the central processing unit 20 It consists of a relay (not shown) which drives the 1st switch 43 and the 2nd switch by this.

When the first switch 43 is connected by the operation of the relay (not shown), the residual current remaining in the load connected to the first power line can be removed by grounding, and the second by the operation of the relay (not shown). When the switch 44 is connected, the residual current remaining in the load connected to the second power line can be removed by grounding. Therefore, after the central processing unit 20 detects the blocking signal, the first switch 43 is connected for about 10 seconds, and the second switch 44 is connected for about 10 seconds to completely remove the residual current.

If the breaker drops due to a temporary electrical shock, an electrical short-circuit or short circuit may result if the condition of the load is electrically inspected without removing the residual current. Therefore, it is necessary to completely remove the residual current to accurately determine the short circuit or the leakage.

The ground fault detecting unit 50 includes a ground fault detecting unit DC power source 51, a first node 53, a first resistor 52 connecting the DC power source 51 and the first node 53, and a first node 53. The first power line contact terminal 56 in contact with the power line 11, the ground fault detecting unit diode 54a and the third switch connecting the first power line contact terminal 56 and the first node 53 ( 54b, a fourth switch 57 connecting the earth ground 13a and the direct current ground 13b, a relay (not shown) for driving the third switch 54b and the fourth switch 57, and a short circuit The leakage detection unit reference voltage source 59 and the first node voltage set higher than the voltage of the first node 53 and lower than the voltage of the first node 53 when normal, and the first node voltage are compared with the reference voltage source 59. It consists of a leakage detection unit comparison operator 58 for outputting the leakage current. In this embodiment, the first power line contact terminal 56 is illustrated as being in contact with the first power line 11, but may be in contact with the second power line 12, and the earth leakage detecting unit 50 is 2. It is preferable that two pieces are provided and are in contact with the first power line 11 and the second power line 12, respectively.

In the present embodiment, the earth leakage detecting unit DC power supply 51 uses 5V, the first resistor 52 uses 1 M (mega) Ω, and the earth leakage detecting unit reference voltage source 59 has a range of 1.13V or more. It is set below 5V.

The earth leakage detector comparison operator 58 is connected to the earth leakage detector buffer circuits 58a and 58b, the output terminal of the buffer circuits 58a and 58b to the non-inverting terminal, and the earth leakage detection unit reference voltage source 59 to the inverting terminal. And a second operational amplifier 58c having an output terminal 55 of the ground fault detecting unit 50 connected to the output terminal.

The ground fault detecting unit buffer circuits 58a and 58b have a first node 53 connected to the non-inverting terminal, and an inverting terminal of the first operational amplifier 58a and the first operational amplifier 58a. And a second resistor 58b connected to the output terminal. The second resistor 58b uses 50K Ω. The first operational amplifier 58a and the second operational amplifier 58c use an operating voltage of 5V.                     

When a short circuit occurs, a virtual resistor 3 due to a short circuit is formed between the first power line contact terminal 56 and the earth ground 13a, as shown in FIG. 5B.

Referring to FIG. 5B, the voltage V1 of the first node 53 is obtained as shown in Equation 1 below.

V1 = (0.7 Rs + VS1 * Rr) / (Rs + Rr)

Here, Rs is a resistance value of the first resistor 52, VS1 is a voltage value of the earth leakage detecting unit DC power supply 51, and Rr is a resistance value of the virtual resistor 3. At this time, the value of Rs is set to 10M Ω, VS1 is set to 5V, and if the value of Rr is less than 100K Ω, it is recognized as a short circuit in the electrical installation, so the value of V1 becomes 1.09 V.

Therefore, the voltage of the non-inverting terminal of the second operational amplifier 58c is 1.09V, and the voltage of the second operational amplifier output terminal is 0V.

Even when the third switch 54b and the fourth switch 57 are connected in the state where the short circuit does not occur, as shown in FIG. 5C, no current flows in the first node 53, so that the voltage of the non-inverting terminal of the second operational amplifier is not increased. In addition, the voltage of the ground fault detecting unit DC power supply 51 is equal to 5V.

Therefore, the voltage at the output terminal of the second operational amplifier 58c becomes 5V.

As described above, the ground fault detecting unit 50 has a voltage of 0 V at the output terminal of the second operational amplifier 58c when the ground fault occurs and a voltage of 5V when the ground fault occurs, and the CPU 20 detects this. It is possible to determine whether or not a short circuit.

The short circuit detecting unit 60 includes a short circuit detecting unit DC power supply 61, a second node 63, a third resistor 62 connecting the DC power supply 61 and the second node 63, and a first node. A short circuit detecting unit diode 64a and a fifth switch connecting the second power line contact terminal 66a in contact with the power line 11, the second node 63, and the second power line contact terminal 66a. 64b), the 6th switch and the 5th switch which connect the 3rd power line contact terminal 66b which contacts the 2nd power supply line 12, and the 3rd power line contact terminal 66b and the DC ground 13b. 64b) and a relay (not shown) for driving the sixth switch 67, and a short circuit detection unit that is formed higher than the voltage of the second node 63 when a short circuit occurs and is set lower than the voltage of the second node 63 when it is normal. A voltage source 69 and a short circuit detection unit comparison operator 68 for outputting a short circuit by comparing the second node voltage with the reference voltage source 69.

In this embodiment, the short circuit detecting unit DC power supply 61 uses 5 V, the third resistor 62 uses 10 KΩ, and the range of the short circuit detecting unit reference voltage source 69 is set to 0.7 V or more and 5 V or less. .

The short circuit detecting unit comparison operator 68 is connected to the short circuit detecting unit buffer circuits 68a and 68b, the output terminal of the buffer circuits 68a and 68b to the non-inverting terminal, and the short circuit detecting unit reference voltage source 69 to the inverting terminal. And the fourth operational amplifier 68c connected to the output terminal of the short circuit detecting unit 60.

The short-circuit sensing buffer circuits 68a and 68b have a second node 63 connected to the non-inverting terminal, and an inverting terminal of the third operational amplifier 68a and the third operational amplifier 68a directly connected to the output terminal. And a fourth resistor 68b connected to the output terminal. The fourth resistor 68b uses 50 KΩ. The operating voltages of the third operational amplifier 68a and the fourth operational amplifier 68c are 5V.

When the short circuit occurs, as illustrated in FIG. 6B, a virtual resistor 4 due to a short circuit is formed between the second power line contact terminal 66a and the fourth power line contact terminal 66b. Usually the resistance value of the virtual resistor 4 is close to 0Ω.

Referring to FIG. 6B, the voltage V1 of the second node 63 is obtained as shown in Equation 2 below.

V2 = 0.7 + I * Rshort = 0.7

Here, Rshort is 0 Ω as the resistance value of the virtual resistor 4.

Therefore, the voltage of the non-inverting terminal of the fourth operational amplifier 68c becomes 0.7V, and the voltage of the fourth operational amplifier output terminal becomes 0V.

Even when the fifth switch 64b and the sixth switch 67 are connected in a short circuit state as shown in FIG. 6C, no current flows through the second node 63, and thus the voltage of the non-inverting terminal of the fourth operational amplifier is also reduced. The voltage of the short circuit detecting unit DC power supply 61 is equal to 5V.

Therefore, the voltage at the output terminal of the fourth operational amplifier 68c is 5V.

As described above, when the short circuit occurs, the voltage of the output terminal of the fourth operational amplifier 68c becomes 0 V when the short circuit occurs, and the voltage becomes 5 V when the short circuit does not occur. It can be detected whether the short circuit.

The display unit 70 receives a signal from the ground fault detecting unit 50 and displays a short circuit in the LED (LED). The display unit 70a receives a signal from the short circuit detecting unit 60 and displays a short circuit in the LED. And a short circuit display unit 60b. In the exemplary embodiment of the present invention, the display unit 70 is configured as an LED, but the display unit 70 is not limited to the LED but may be implemented using various display devices.

The central processing unit 20 controls the power circuit breaker 10, the ground discriminating unit 30, the residual current removing unit 40, the ground fault detecting unit 50, and the short circuit detecting unit 60 as described above. How to do this will be described using the flowchart of FIG.

In the method for controlling the automatic earth leakage breaker according to the present invention, the central processing unit 20 determines the operation of the circuit breaker (21) and controls the ground discrimination unit 30 when the circuit breaker is operated to determine whether the ground is appropriate. The ground discrimination step 22a for determining the operation, the step 22b for stopping the processor if it is determined that the ground is not appropriate in the ground discrimination step 22a, and remaining in the ground discrimination step 22a After controlling the current removing unit 40 to remove the residual current (23), and after removing the residual current step (24) of detecting the short circuit by detecting the short circuit, and after detecting the short circuit Detecting the short circuit (25), and determining the short circuit or short circuit using the result of the step of detecting the short circuit and detecting the short circuit (26), and the circuit breaker in case of short circuit or short circuit Automatic return to step (27) , Step 28 of eliminating the cause in the case of a short circuit or a short circuit, and determining whether or not the cause has been eliminated, and passing control to the breaker automatic return 27 step 29.

Step 23 of removing the residual current sequentially or simultaneously operates a relay (not shown) coupled to the first switch 43 and a relay (not shown) coupled to the second switch 44 as described above. The current remaining in the first power supply line and the second power supply line is removed.                     

In the detecting step 24, the relay coupled to the third switch 54b and the fourth switch 57 is operated to check the voltage of the ground fault detecting unit output terminal 55, and if the voltage is 0V, the ground fault occurs. 5V is not a short circuit.

In the detecting step 25, the relay coupled to the fifth switch 64b and the sixth switch 67 is operated to check the voltage of the short-circuit detecting unit output terminal 65, and if the voltage is 0V, the short-circuit is performed. 5V is not a short circuit.

The step 27 of automatically returning the breaker operates a relay coupled to the breaker to return the breaker.

According to the embodiment of the present invention as described above, various effects including the following matters can be expected. However, the present invention is not achieved by exerting all of the following effects.

First, the present invention can accurately determine the short-circuit and short-circuit or electrical shock generated in the load, it is possible to ensure rapid troubleshooting and automatic return.

In addition, by providing the residual current removing unit, the reliability of the electric leakage detection and the short circuit detection can be greatly increased.

In addition, by providing a ground discrimination unit, it is possible to reduce an error in short-circuit detection and short-circuit detection that may occur due to improper grounding.

In addition, by providing a display unit, it is easy for a person to see whether the breaker is dropped by a short circuit, a short circuit, or a temporary shock, thereby reducing easy troubleshooting and psychological burden.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

Claims (15)

Power breaker; Residual current removal unit for removing the residual current of the load; A short circuit detecting unit for monitoring a short circuit of a load; And After receiving the circuit breaker operation signal from the power circuit breaker, the residual current removal unit is controlled to remove residual current remaining in the load, and the ground fault detection unit is controlled to detect whether the load is short and there is no power circuit breaker. A central processing unit for returning; Automatic power cut off device comprising a. The method of claim 1, Further comprising a; short circuit detection unit for monitoring the short circuit of the load; The central processing unit removes the residual current remaining in the load by controlling the residual current removing unit, and then controls the short circuit detecting unit to detect the short circuit of the load and to restore the power breaker only when there is no short circuit. Power cutoff device. Power breaker; Residual current removal unit for removing the residual current of the load; Short circuit detection unit for monitoring the short circuit of the load; And After receiving the circuit breaker operation signal from the power circuit breaker, the residual current removal unit is controlled to remove residual current remaining in the load, and the short circuit detection unit is controlled to detect whether the load is short circuited and the power circuit breaker only when there is no short circuit. A central processing unit for returning; Automatic power cut off device comprising a. The method of claim 1, A ground determination unit determining whether or not grounding is appropriate; More, And the central processing unit controls the ground discrimination unit to determine whether the ground is appropriate and controls the residual current removing unit. The method of claim 1, A ground fault display unit for receiving a signal from the ground fault detection unit and displaying a ground fault; Auto shut off device further comprising a. The method of claim 2 or 3, A short circuit display unit configured to receive a signal from the short circuit detection unit and display a short circuit; Auto shut off device further comprising a. The method according to any one of claims 1 to 4, The residual current removing unit, A ground line connecting the power line and the ground; A switch provided to short the ground wire; And A relay coupled to the switch and controlled by the central processing unit; Automatic power cut off device comprising a. The method of claim 1, The earth leakage detecting unit, Earth leakage detection unit DC power; A first node connected to the DC power supply by a first resistor; A first power line contact terminal formed to be in contact with the power line of the load; A third switch provided between the first node and the first power line contact terminal; An earth leakage detecting unit reference voltage source that is higher than a voltage applied to the first node when the load is shorted when the third switch is connected, and lower than that of the earth leakage detecting unit DC power; And An earth leakage detecting unit comparison operator configured to compare the voltage of the first node with the earth leakage detecting unit reference voltage source and output an earth leakage detecting unit; Automatic power cut off device comprising a. The method of claim 8, The earth leakage detection unit comparison operator, The non-inverting terminal is the voltage of the first node is input, the inverting terminal is input voltage of the ground fault sensing unit reference voltage source, the output terminal is a second operational amplifier connected to the ground fault sensing unit output terminal Blocking device. The method of claim 8, Automatic power cut off device characterized in that the leakage detection unit diode is coupled between the first node and the third switch. delete The method of claim 2 or 3, The short circuit detection unit, Short circuit detection unit DC power; A second node connected to the DC power supply by a third resistor; A second power line contact terminal formed to be in contact with the first power line of the load; A third power line contact terminal formed to be in contact with the second power line of the load; A fifth switch disposed between the second node and the second power line contact terminal; A short circuit detection diode coupled between the second node and the fifth switch; A sixth switch for opening and closing between the third power line contact terminal and ground; A short-circuit sensing unit reference voltage source that is higher than the voltage applied to the second node when the load is short-circuited when the fifth switch and the sixth switch are connected, and set lower than the short-circuit detecting unit DC power supply; And Compares the voltage of the second node with the short-circuit sensing unit reference voltage source, outputs a short-circuit detection state, inputs a voltage of the second node to a non-inverting terminal, and inputs a voltage of the short-circuit sensing unit reference voltage source to an inverting terminal. A short circuit detecting unit comparison operator, which is a fourth operational amplifier connected to the short circuit detecting unit output terminal; Automatic power cut off device comprising a. A first step of determining whether the breaker is in operation; A second step of removing residual current in a power line of a load when the breaker is operated in the first step; Inspecting whether the load is shorted after the second step; And Returning a circuit breaker when a short circuit has not occurred in the checking of the short circuit; Automatic power circuit breaker control method comprising a. The method of claim 13, Checking whether the load is short-circuited after the second step; And Returning a circuit breaker if no short circuit occurs in the checking of the short circuit; Automatic power circuit breaker control method comprising a. The method according to claim 13 or 14, The second step, Automatic power circuit breaker control method characterized in that the grounding of the power supply line of the load sequentially to the ground.

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