CN214958674U - Circuit breaker and residual current protection circuit thereof - Google Patents
Circuit breaker and residual current protection circuit thereof Download PDFInfo
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- CN214958674U CN214958674U CN202120267340.6U CN202120267340U CN214958674U CN 214958674 U CN214958674 U CN 214958674U CN 202120267340 U CN202120267340 U CN 202120267340U CN 214958674 U CN214958674 U CN 214958674U
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Abstract
The utility model provides a residual current protection circuit, includes power supply, earth leakage detection and protection module and execution module, power supply can provide operating voltage for residual current protection circuit, earth leakage detection and protection module are to execution module output tripping signal when the electric leakage, execution module includes self-resuming circuit and self-shutdown circuit. The utility model discloses still disclose a circuit breaker, including zero sequence transformer and trip coil be connected on the main line of circuit breaker as above residual current protection circuit, wherein the earth leakage detects and is connected with zero sequence transformer with protection module, and execution module is connected with trip coil and can control trip coil and gain or lose the electricity. Through setting up self-resuming circuit and self-closing circuit in the execution module, can avoid causing trip coil long-term circular telegram to be burnt because of faults such as mechanism jamming to can make the circuit breaker realize the reversal.
Description
Technical Field
The utility model relates to a low voltage distribution system, concretely relates to circuit breaker and residual current protection circuit thereof.
Background
The circuit breaker is an electrical apparatus by wide application, and current residual current protection circuit breaker adopts earth leakage protection chip and silicon controlled rectifier complex mode to protect mostly, under normal conditions, takes place the electric leakage when the circuit, and the circuit breaker is carrying out the earth leakage protection action, and the silicon controlled rectifier switches on the action of drive trip coil, and the circuit breaker divides the floodgate. However, because the thyristor is a current-driven semi-controlled device, after the thyristor is turned on, if the thyristor cannot be tripped due to a failure such as a mechanism jam, the trip coil will be continuously powered on until the thyristor is burnt out, and in addition, because the trip coil takes power from the incoming line end (power end) of the circuit breaker, the existing circuit breaker for providing leakage protection is required not to be reversely connected, that is, the incoming line end (power end) and the outgoing line end (load end) of the circuit breaker cannot be reversely connected, otherwise, even if the circuit breaker is opened, the trip coil also takes power from the outgoing line end (load end) to be powered on for a long time, and finally the trip coil is burnt out.
Disclosure of Invention
An object of the utility model is to overcome prior art's defect, provide a prevent that trip coil from being burnt out, and support circuit breaker of anti-inlet wire wiring and residual current protection circuit thereof.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a residual current protection circuit comprises a power supply, an electric leakage detection and protection module and an execution module, wherein the power supply can provide working voltage for the residual current protection circuit, the electric leakage detection and protection module is connected on a main line of a circuit breaker, the electric leakage detection and protection module detects whether the main line leaks electricity in real time and outputs a tripping signal to the execution module when the electric leakage occurs, the execution module comprises a self-recovery circuit and a self-shutdown circuit, the self-recovery circuit is connected between the electric leakage detection and protection module and the self-shutdown circuit, when the self-recovery circuit continuously receives the tripping signal, the self-recovery circuit and the self-shutdown circuit are switched on, the self-shutdown circuit is automatically switched off within a period of time after being switched on, a tripping coil of the circuit breaker can be controlled to be powered on or powered off through the switching on and off of the self-shutdown circuit, and when the self-recovery circuit does not receive the tripping signal any more, the self-healing circuit and the self-shutdown circuit are capable of clearing previously received trip signals.
Further, the self-recovery circuit comprises a one-way conduction element, a first switch element, a first charging element and at least two resistors, when the self-recovery circuit receives a trip signal, one of the resistors converts the trip signal into a voltage signal, the one-way conduction element is conducted, the first charging element is charged to enable the first switch element to be conducted and continuously output the trip signal to the self-shutdown circuit, when the self-recovery circuit does not receive the trip signal any more, the one-way conduction element enables the first charging element to discharge through the other resistor to clear the trip signal, and the first switch element is turned off.
Further, the self-turn-off circuit comprises a second switching element, a third switching element, a second charging element and at least one resistor, wherein the second switching element is used for controlling the self-turn-off circuit to be switched on or off, and the third switching element and the second charging element are matched for switching off the second switching element;
the second switch element is switched on under the driving of a tripping signal output by the self-recovery circuit, so that the self-shutdown circuit is switched on, a tripping coil of the circuit breaker is powered on and switched off, the second charging element charges to enable the third switch element to be switched on and the second switch element is switched off along with the continuous receiving of the tripping signal by the self-shutdown circuit, the self-shutdown circuit is switched off to enable the tripping coil of the circuit breaker to be powered off, the tripping signal is not output at the self-recovery circuit any longer, and the second charging element discharges through a resistor to clear the tripping signal.
And the power supply is connected with the electric leakage detection and protection module and the execution module through the power supply monitoring module, the power supply monitoring module detects the output voltage value of the power supply in real time, and outputs working voltage to the electric leakage detection and protection module and the execution module respectively after detecting that the voltage value is greater than a preset voltage value.
Further, the leakage detection and protection module includes a chip U1, a resistor R1, a capacitor C1, and a clamp voltage element D1, where the capacitor C1, the resistor R1, and the clamp voltage element D1 are all connected IN parallel to two ends of a zero-sequence transformer of the circuit breaker, one end of the resistor R1 and one end of the resistor R1 are respectively connected to two ends of the zero-sequence transformer, the other ends of the resistor R1 and the resistor R1 are respectively connected to pins IN1 and IN1 of the chip U1, the capacitor C1 is connected IN parallel to the pin IN1 of the chip U1, a pin OS of the chip U1 is connected to the execution module and outputs a trip signal to the execution module, a pin of the chip U1 is connected to a power supply monitoring module, an anode of the capacitor C1, one end of the capacitor C1 and one end of the capacitor C1 of the chip U1 is connected to the execution module, One end of the resistor R12 and one end of the resistor R16 are connected to the PC pin, VDD pin, DLY pin, OA pin, MODE pin, and PR pin of the chip U1, respectively, and the cathode of the capacitor C6, the other end of the capacitor C7, the other end of the capacitor C8, the other end of the capacitor C9, the other end of the resistor R12, the other end of the resistor R16, and the VSS pin of the chip U1 are connected to GND.
Further, the self-recovery circuit comprises a resistor R17, a resistor R18, a capacitor C10, a diode D9 and a triode Q2, wherein the anode of the diode D9 and one end of the resistor R17 are connected with the leakage detection and protection module, the cathode of the diode D9, one end of the resistor R18 and the anode of the capacitor C10 are connected with the base of the triode Q2, the collector of the triode Q2 is connected with the power supply monitoring module, the emitter of the triode Q2 is connected with the self-turn-off circuit, and the other end of the resistor R17, the other end of the resistor R18 and the cathode of the capacitor C10 are connected with GND.
Further, the self-shutdown circuit comprises a resistor R19, a resistor R20, a resistor R21, a capacitor C11, a transistor Q3, a MOS transistor Q4 and a diode D10, wherein one end of the resistor R19 and one end of the resistor R21 are connected to the self-recovery circuit, the other end of the resistor R19 and one end of the resistor R20 and an anode of the capacitor C11 are connected to a base of the transistor Q3, the other end of the resistor R21 and a collector of the transistor Q3 are connected to a gate of the MOS transistor Q4, a drain of the MOS transistor Q4 is connected to an anode of the diode D10 and a second terminal of the trip coil, a cathode of the diode D10 and a first terminal of the trip coil are connected to the power supply, and the other end of the resistor R20, a cathode of the capacitor C11, an emitter of the transistor Q3 and a source of the MOS transistor Q4 are connected to the GND.
Further, the power monitoring module comprises a resistor R13, a resistor R14, a resistor R15, a transistor Q1 and a capacitor C5, one end of the resistor R13 and an emitter of the transistor Q1 are connected with a power supply, the other end of the resistor R13 and one end of the resistor R14 are connected with a base of a transistor Q1, a collector of the transistor Q1 is used as an output end and is connected with the leakage detection and protection module and the execution module, one end of the resistor R15 and one end of the capacitor C5 are connected with a collector of a transistor Q1, and the other ends of the resistor R14, the resistor R15 and the capacitor C5 are connected with GND.
Further, the power supply obtains electricity from a main line of the circuit breaker, the power supply comprises a rectifying circuit, a resistor and a voltage stabilizing tube, and the power supply is rectified by the rectifying circuit and then subjected to voltage reduction by the resistor and the voltage stabilizing tube to obtain direct current.
A circuit breaker comprises a zero sequence transformer and a trip coil, wherein a main circuit of the circuit breaker is connected with a residual current protection circuit, a leakage detection and protection module is connected with the zero sequence transformer, and an execution module is connected with the trip coil and can control the trip coil to be electrified or deenergized.
The utility model discloses a circuit breaker and residual current protection circuit thereof, set up self-resuming circuit and self-turn-off circuit in the execution module, trip signal makes self-resuming circuit and self-turn-off circuit switched on, make trip coil get electric, trip coil disconnection action makes circuit breaker dropout outage, after self-turn-off circuit switches on a terminal time, self-turn-off circuit turn-offs, make trip coil lose electricity, no matter whether trip coil does the action this moment all is in the power-off state, so avoid causing trip coil long-term circular telegram to be burnt out because of faults such as mechanism jamming, in addition, when self-resuming circuit no longer receives trip signal, self-resuming circuit and self-turn-off circuit can clear away the trip signal that received before, so that carry out next earth leakage protection.
In addition, when the self-recovery circuit receives the trip signal, the one-way conduction element of the self-recovery circuit is conducted, the first charging element charges and conducts the first switch element, the self-recovery circuit continuously outputs the trip signal to the self-shutdown circuit, when the self-recovery circuit does not receive the trip signal any more, the one-way conduction element and the first switch element are turned off, and the first charging element discharges through the resistor to clear the trip signal for receiving the next trip signal.
In addition, the second switch element of the self-turn-off circuit is turned off by the cooperation of the third switch element and the second charging element, and the turn-off time of the second switch element can be adjusted by adjusting the second charging element, so that the turn-on and turn-off time of the self-turn-off circuit can be adjusted.
In addition, through addding power monitoring module, can guarantee only can make residual current detection circuit work when power supply's voltage is enough high.
Drawings
Fig. 1 is a schematic diagram of a residual current protection circuit according to the present invention;
fig. 2 is a circuit diagram of a power supply and a power supply monitoring module in the residual current protection circuit of the present invention;
fig. 3 is a circuit diagram of a leakage detecting and protecting module in a residual current protecting circuit according to the present invention;
fig. 4 is a circuit diagram of an execution module in the residual current protection circuit of the present invention.
Detailed Description
The following describes a specific embodiment of a circuit breaker and a residual current protection circuit thereof according to the present invention with reference to the embodiments shown in fig. 1 to 4. The utility model discloses a circuit breaker and residual current protection circuit thereof is not limited to the description of following embodiment.
A residual current protection circuit comprises a power supply, an electric leakage detection and protection module and an execution module, wherein the power supply can provide working voltage for the residual current protection circuit, the electric leakage detection and protection module is connected on a main line of a circuit breaker, the electric leakage detection and protection module detects whether the main line leaks electricity in real time and outputs a tripping signal to the execution module when the electric leakage occurs, the execution module comprises a self-recovery circuit and a self-shutdown circuit, the self-recovery circuit is connected between the electric leakage detection and protection module and the self-shutdown circuit, when the self-recovery circuit continuously receives the tripping signal, the self-recovery circuit and the self-shutdown circuit are switched on, the self-shutdown circuit is automatically switched off within a period of time after being switched on, a tripping coil of the circuit breaker can be controlled to be powered on or powered off through the switching on and off of the self-shutdown circuit, and when the self-recovery circuit does not receive the tripping signal any more, the self-healing circuit and the self-shutdown circuit are capable of clearing previously received trip signals.
The utility model discloses a circuit breaker and residual current protection circuit thereof, set up self-resuming circuit and self-turn-off circuit in the execution module, trip signal makes self-resuming circuit and self-turn-off circuit switched on, make trip coil get electric, trip coil disconnection action makes circuit breaker dropout outage, after self-turn-off circuit switches on a terminal time, self-turn-off circuit turn-offs, make trip coil lose electricity, no matter whether trip coil does the action this moment all is in the power-off state, so avoid causing trip coil long-term circular telegram to be burnt out because of faults such as mechanism jamming, in addition, when self-resuming circuit no longer receives trip signal, self-resuming circuit and self-turn-off circuit can clear away the trip signal that received before, so that carry out next earth leakage protection.
An embodiment of a residual current protection circuit is provided with reference to fig. 1 to 4, the residual current protection circuit includes a power supply, an electric leakage detection and protection module and an execution module, the power supply is configured to provide a working voltage for the residual current protection circuit, a preferred power supply provides a working voltage for the electric leakage detection and protection module and the execution module through a power monitoring module, the power monitoring module detects an output voltage value of the power supply in real time, and outputs the working voltage to the electric leakage detection and protection module and the signal processing module respectively after detecting that the voltage value is greater than a preset voltage value. The power supply is rectified by the rectifying circuit and then subjected to voltage reduction by the resistor and the voltage stabilizing tube to obtain direct current, preferably direct current of about 5.1V.
The leakage detection and protection module is connected to a main line of the circuit breaker, detects whether the main line leaks electricity in real time and outputs a tripping signal (marked as SCR in the figure) to the signal processing module when the main line leaks electricity, detects the leakage value of the main line in real time to judge whether the main line leaks electricity, and outputs the tripping signal to the execution module when the leakage fault occurs.
The execution module comprises a self-recovery circuit and a self-shutdown circuit, the self-recovery circuit is connected between the leakage detection and protection module and the self-shutdown circuit, the self-recovery circuit comprises a one-way conduction element, a first switch element, a first charging element and at least two resistors, when the self-recovery circuit receives a tripping signal, one of the resistors converts the tripping signal into a voltage signal, the one-way conduction element is conducted, the first charging element charges and enables the first switch element to be conducted, at the moment, the self-recovery circuit continuously outputs a high-level tripping signal to the self-shutdown circuit, when the self-recovery circuit does not receive the tripping signal any more, the one-way conduction element enables the first charging element to discharge through the other resistor to clear the tripping signal, the first switch element is turned off and is used for receiving the next tripping signal, and meanwhile, after the first switch element is turned off, the self-recovery circuit does not continuously output the high level to the self-shutdown circuit any more, so that the self-shutdown circuit can clear the trip signal.
The self-turn-off circuit comprises a second switching element, a third switching element, a second charging element and at least one resistor, wherein the second switching element is used for controlling the self-turn-off circuit to be switched on or off, and the third switching element and the second charging element are matched for switching off the second switching element; when the self-shutdown circuit starts to receive a trip signal, the second switching element is turned on to enable the self-shutdown circuit to be turned on, a trip coil (marked as P2 in fig. 4) of the circuit breaker is powered on and off, the second charging element charges to enable the third switching element to be turned on and the second switching element is turned off along with continuous receiving of the trip signal by the self-shutdown circuit, the self-shutdown circuit is turned off to enable the trip coil of the circuit breaker to be powered off, therefore, the trip coil is in a power-off state no matter whether the trip coil acts, long-term power-on of the trip coil caused by faults such as mechanism clamping stagnation is avoided from being burnt, when the self-recovery circuit does not receive the trip signal any more, the self-recovery circuit does not output continuous high level to the self-shutdown circuit any more, and the second charging element discharges through a resistor to clear the trip signal so as to perform next leakage protection.
Under the coordination of the self-recovery circuit and the self-turn-off circuit, the self-recovery circuit has a signal holding function, namely, the self-recovery circuit receives a pulse tripping signal, and the self-recovery circuit converts the periodic and intermittent pulse tripping signal into a continuous high level, so that the pulse tripping signal is prevented from being directly input into the self-turn-off circuit, and a second switching element of the self-turn-off circuit is continuously switched on and off along with the periodic change of the pulse tripping signal. In addition, when reverse incoming line wiring is performed, elements such as a controller of the circuit breaker are electrified for a long time, and particularly under the condition that the self-shutdown circuit is directly connected with the trigger, the trigger continuously outputs high level after being triggered, so that the self-shutdown circuit can not recover the original state after the trip coil performs leakage protection once due to long-term reception of high level, and therefore, the self-shutdown circuit can be used for recovering the self-shutdown circuit to the original state to perform the next leakage protection by utilizing the characteristic that the self-shutdown circuit can be shut down when not receiving a trip signal, and the self-shutdown circuit does not receive the continuous high level any more after the leakage value is low or the leakage fault is relieved.
The specific connection mode of the power supply and the power supply monitoring module is provided by combining fig. 2, the power supply comprises a diode D, a resistor R, a voltage stabilizing diode D and a capacitor C, cathodes of the diode D, the diode D and the diode D are used as output ends to be connected with the execution module and a trip coil of the circuit breaker, anodes of the diode D, the diode D and the diode D are respectively connected with one phase circuit in the main circuit, cathodes of the diode D, the diode D and the diode D are respectively connected with anodes of the diode D, the diode D and the diode D, after the resistor R, the resistor R and the resistor R are sequentially connected in series, one end of the resistor R is connected with the cathode of the diode D, one end of a resistor R10 is connected with a cathode of a voltage stabilizing diode D8, one end of a capacitor C3 and the power supply detection module, a resistor R2 is connected with two ends of a resistor R1 in parallel, a resistor R4 is connected with two ends of a resistor R3 in parallel, a resistor R7 is connected with two ends of a resistor R6 in parallel, a resistor R11 is connected with two ends of a resistor R10 in parallel, and an anode of a diode D2, an anode of a diode D4, an anode of a diode D6, an anode of a voltage stabilizing diode D8 and the other end of a capacitor C3 are connected with GND.
As shown in fig. 2, the voltage dependent resistor RV1 is connected between the first phase line L1 and the third phase line L3, the voltage dependent resistor RV2 is connected between the first phase line L1 and the second phase line L2, and the voltage dependent resistor RV3 is connected between the second phase line L2 and the third phase line L3.
The power supply monitoring module comprises a resistor R13, a resistor R14, a resistor R15, a triode Q1 and a capacitor C5, wherein one end of the resistor R13 and an emitter of the triode Q1 are connected with a power supply, namely one end of the resistor R13 and the emitter of the triode Q1 are connected with one end of a resistor R10 in the power supply, the other end of the resistor R13 and one end of the resistor R14 are connected with a base of the triode Q1, a collector of the triode Q1 is used as an output end and is connected with the leakage detection and protection module and the execution module, one end of the resistor R15 and one end of the capacitor C5 are connected with a collector of the triode Q1, the other ends of the resistor R14, the resistor R15 and the capacitor C5 are connected with GND, wherein the resistor R13 and the resistor R14 are voltage dividing resistors, when the voltage value output by the power supply is greater than a preset value, the triode Q1 is turned on, the residual current detection circuit starts to work, for example, when the voltage output by the power supply is greater than 4.4.4V, the power supply monitoring module can output working voltage of about 5V, and when the voltage output by the power supply is less than 4.4V, the power supply monitoring module does not work, and then the electric leakage detection and protection module and the execution module do not work.
With reference to fig. 3, a specific connection manner of a leakage detection and protection module is provided, where the leakage detection and protection module includes a chip U1, a resistor R5, a resistor R8, a resistor R9, a resistor R12, a resistor R16, a capacitor C2, a capacitor C4, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, and a clamp voltage element D7, where the capacitor C2, the resistor R5, and the clamp voltage element D7 are all connected IN parallel to two ends of a zero sequence transformer P1 of a circuit breaker, one ends of the resistor R8 and the resistor R9 are connected to two ends of a zero sequence transformer P1, the other ends of the resistor R8 and the resistor R9 are connected to an IN1 pin and an IN2 pin of the chip U1, the capacitor C4 is connected IN parallel to an IN1 pin and an IN2 pin of the chip U1, a pin of the chip U1 is connected to an execution module and outputs a trip signal to an anode VDD of the execution module, and a power supply monitoring module of the chip U1, and a power supply monitoring module of the chip C6 are connected to the execution module, One end of the capacitor C7, one end of the capacitor C8, one end of the capacitor C9, one end of the resistor R12, and one end of the resistor R16 are connected to the PC pin, VDD pin, DLY pin, OA pin, MODE pin, and PR pin of the chip U1, respectively, and the cathode of the capacitor C6, the other end of the capacitor C7, the other end of the capacitor C8, the other end of the capacitor C9, the other end of the resistor R12, the other end of the resistor R16, and the VSS pin of the chip U1 are connected to GND. The chip U1 adopts a leakage protection chip, and can select a common chip 54123,54133, FM2149, and the like, in this example, a FM2149 chip of a double-denier microelectronics is adopted, and when it is detected that the leakage meets the action value, pin 1 of the chip U1, that is, pin OS, outputs a trip pulse signal of about 30ms to the outside.
With reference to fig. 4, a specific connection manner of the execution module is provided, wherein the self-recovery circuit of the execution module includes a resistor R17, a resistor R18, a capacitor C10, a diode D9, and a transistor Q2, the diode D9 is a unidirectional conducting element, the transistor Q2 is used as a first switching element, an anode of the diode D9 and one end of the resistor R17 are connected to the leakage detection and protection module, a cathode of the diode D9, one end of the resistor R18, and an anode of the capacitor C10 are connected to a base of the transistor Q2, a collector of the transistor Q2 is connected to the power supply monitoring module, an emitter of the transistor Q2 is connected to the self-shutdown circuit, and the other end of the resistor R17, the other end of the resistor R18, and a cathode of the capacitor C10 are connected to GND. When the leakage detection and protection module continuously outputs the pulse tripping signal, the tripping signal is usually a current signal, the resistor R17 is used to convert the tripping signal into a voltage signal to charge the capacitor C10 as a first charging element, the diode D9 as a one-way conducting element and the transistor Q2 as a first switching element are turned on, when the self-recovery circuit no longer receives the tripping signal, that is, the main line returns to normal or the leakage value is lower than the action value, the capacitor C10 can only discharge through the resistor R18 under the action of the diode D9, when the voltage across the capacitor C10 is smaller than the conducting voltage of the transistor Q2, the transistor Q2 is turned off, and when the electric quantity of the capacitor C10 is released below a certain level, the tripping signal of the self-recovery circuit is cleared.
The self-turn-off circuit comprises a resistor R19, a resistor R20, a resistor R21, a capacitor C11, a transistor Q3, a transistor Q4 and a diode D10, wherein a MOS transistor Q4 is used as a second switching element, a transistor Q3 is used as a third switching element, a capacitor C11 is used as a second charging element, one end of the resistor R19 and one end of the resistor R21 are connected with a self-recovery circuit, namely connected with an emitter electrode of the transistor Q2, the other end of the resistor R19, one end of a resistor R20 and an anode of a capacitor C11 are connected with a base electrode of the transistor Q3, the other end of the resistor R21 and a collector electrode of the transistor Q3 are connected with a gate electrode of the MOS transistor Q4, a drain electrode of the MOS transistor Q4 is connected with an anode electrode of the diode D10 and a second terminal of a trip coil, a cathode electrode of the diode D10 and a first terminal of the trip coil of the diode D10 are connected with a power supply source, namely connected with a cathode electrode of the diode D10, and a cathode of the capacitor C10, The emitter of the transistor Q3 and the source of the MOS transistor Q4 are connected to GND.
The self-recovery circuit receives a trip signal to charge the capacitor C10, when the voltage at two ends of the capacitor C10 is greater than the conduction voltage of the triode Q2, the triode Q2 is conducted, meanwhile, the MOS tube Q4 is also conducted, the trip coil is powered to drive the breaker to open, the self-recovery circuit outputs the trip signal to the self-shutdown circuit continuously, the capacitor C11 is charged, when the voltage at two ends of the capacitor C11 is greater than the conduction value of the triode Q3, the triode Q3 is conducted, the MOS tube Q4 is turned off, and the trip coil is powered off. It should be noted that, when the leakage detection and protection module continuously outputs the trip signal, the capacitor C10 and the capacitor C11 always satisfy the conduction adjustment of the transistor Q2, so the trip coil is only energized once, in addition, the capacitor C10 can ensure that the transistor Q2 is always in the conduction state during the low level period when the leakage detection and protection module outputs the pulse trip signal, and meanwhile, the conduction time of the self-recovery circuit and the self-shutdown circuit can be respectively adjusted by adjusting the charging time of the capacitor 10 and the capacitor C11. When the self-recovery circuit does not receive the tripping signal any more, namely the main line recovers to be normal or the leakage value is lower than the action value, the capacitor C11 discharges through the resistor R20, when the electric quantity of the capacitor C11 is released to be below a certain level, the tripping signal of the self-recovery circuit is cleared, at the moment, the self-recovery circuit and the self-turn-off circuit also recover to be in the original state, namely the triode Q2 is cut off, the MOS tube Q4 is turned off, the tripping coil loses power at the moment, and therefore next leakage protection can be carried out.
The utility model provides a circuit breaker, includes trip coil and zero sequence transformer, is connected on the main line of circuit breaker as above residual current protection circuit, wherein electric leakage detection is connected with zero sequence transformer with protection module for acquire the leakage current signal on the main line, execution module is connected with trip coil and can control trip coil and get electricity or lose electricity, makes trip coil can make circuit breaker dropout outage after getting electricity.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (10)
1. A residual current protection circuit, characterized by: comprises a power supply, a leakage detection and protection module and an execution module, wherein the power supply can provide working voltage for the residual current protection circuit, the leakage detection and protection module is connected with a main line of the circuit breaker and detects whether the main line leaks electricity in real time, and outputs a trip signal to the execution module when the leakage occurs, the execution module comprises a self-recovery circuit and a self-shutdown circuit, the self-recovery circuit is connected between the leakage detection and protection module and the self-shutdown circuit, when the self-recovery circuit continuously receives the tripping signal, the self-recovery circuit and the self-shutdown circuit are conducted, the self-shutdown circuit automatically shuts off within a period of time after the self-shutdown circuit is conducted, the on and off of the self-turn-off circuit can control the tripping coil of the circuit breaker to be electrified or deenergized, the self-healing circuit as well as the self-shutdown circuit are able to clear a previously received trip signal when the self-healing circuit is no longer receiving the trip signal.
2. A residual current protection circuit according to claim 1, characterized in that: the self-recovery circuit comprises a one-way conduction element, a first switch element, a first charging element and at least two resistors, when the self-recovery circuit receives a tripping signal, one of the resistors converts the tripping signal into a voltage signal, the one-way conduction element is conducted, the first charging element is charged to enable the first switch element to be conducted and continuously output the tripping signal to the self-shutdown circuit, when the self-recovery circuit does not receive the tripping signal any more, the one-way conduction element enables the first charging element to discharge through the other resistor to clear the tripping signal, and the first switch element is turned off.
3. A residual current protection circuit according to claim 1, characterized in that: the self-turn-off circuit comprises a second switching element, a third switching element, a second charging element and at least one resistor, wherein the second switching element is used for controlling the self-turn-off circuit to be switched on or off, and the third switching element and the second charging element are matched for switching off the second switching element;
the second switch element is switched on under the driving of a tripping signal output by the self-recovery circuit, so that the self-shutdown circuit is switched on, a tripping coil of the circuit breaker is powered on and switched off, the second charging element charges to enable the third switch element to be switched on and the second switch element is switched off along with the continuous receiving of the tripping signal by the self-shutdown circuit, the self-shutdown circuit is switched off to enable the tripping coil of the circuit breaker to be powered off, the tripping signal is not output at the self-recovery circuit any longer, and the second charging element discharges through a resistor to clear the tripping signal.
4. A residual current protection circuit according to any one of claims 1 to 3, wherein: the power supply is connected with the electric leakage detection and protection module and the execution module through the power supply monitoring module, the power supply monitoring module detects the output voltage value of the power supply in real time, and outputs working voltage to the electric leakage detection and protection module and the execution module respectively after the voltage value is detected to be greater than the preset voltage value.
5. A residual current protection circuit according to claim 4, characterized in that: the leakage detection and protection module comprises a chip U1, a resistor R1, a capacitor C1 and a clamping voltage element D1, wherein the capacitor C1, the resistor R1 and the clamping voltage element D1 are all connected IN parallel at two ends of a mutual inductor of the circuit breaker, one ends of the resistor R1 and the resistor R1 are respectively connected at two ends of a zero sequence mutual inductor, the other ends of the resistor R1 and the resistor R1 are respectively connected at an IN1 pin and an IN1 pin of the chip U1, the capacitor C1 is connected IN parallel between the IN1 pin and the IN1 pin of the chip U1, a pin of the chip U1 OS is connected with an execution module and outputs a tripping signal to the execution module, a pin of the chip U1 is connected with a power supply monitoring module, an anode of the capacitor C1, one end of the capacitor VDD of the capacitor C1, one end of the capacitor C1 and the VDD 1 of the capacitor C1, One end of the resistor R12 and one end of the resistor R16 are connected to the PC pin, VDD pin, DLY pin, OA pin, MODE pin, and PR pin of the chip U1, respectively, and the cathode of the capacitor C6, the other end of the capacitor C7, the other end of the capacitor C8, the other end of the capacitor C9, the other end of the resistor R12, the other end of the resistor R16, and the VSS pin of the chip U1 are connected to GND.
6. A residual current protection circuit according to claim 4, characterized in that: the self-recovery circuit comprises a resistor R17, a resistor R18, a capacitor C10, a diode D9 and a triode Q2, wherein the anode of the diode D9 and one end of a resistor R17 are connected with the electric leakage detection and protection module, the cathode of the diode D9, one end of the resistor R18 and the anode of the capacitor C10 are connected with the base of the triode Q2, the collector of the triode Q2 is connected with the power supply monitoring module, the emitter of the triode Q2 is connected with the self-turn-off circuit, and the other end of the resistor R17, the other end of the resistor R18 and the cathode of the capacitor C10 are connected with GND.
7. A residual current protection circuit according to claim 4, characterized in that: the self-turn-off circuit comprises a resistor R19, a resistor R20, a resistor R21, a capacitor C11, a triode Q3, a MOS tube Q4 and a diode D10, wherein one end of the resistor R19 and one end of the resistor R21 are connected with a self-recovery circuit, the other end of the resistor R19, one end of the resistor R20 and the anode of the capacitor C11 are connected with the base of the triode Q3, the other end of the resistor R21 and the collector of the triode Q3 are connected with the gate of the MOS tube Q4, the drain of the MOS tube Q4 is connected with the anode of the diode D10 and the second terminal of the trip coil, the cathode of the diode D10 and the first terminal of the trip coil are connected with a power supply, and the other end of the resistor R20, the cathode of the capacitor C11, the emitter of the triode Q3 and the source of the MOS tube Q4 are connected with GND.
8. A residual current protection circuit according to claim 4, characterized in that: the power supply monitoring module comprises a resistor R13, a resistor R14, a resistor R15, a triode Q1 and a capacitor C5, one end of the resistor R13 and an emitter of the triode Q1 are connected with a power supply, the other end of the resistor R13 and one end of the resistor R14 are connected with a base of a triode Q1, a collector of the triode Q1 serves as an output end and is connected with the leakage detection and protection module and the execution module, one end of the resistor R15 and one end of the capacitor C5 are connected with a collector of a triode Q1, and the other ends of the resistor R14, the resistor R15 and the capacitor C5 are connected with GND.
9. A residual current protection circuit according to claim 1, characterized in that: the power supply obtains electricity from a main line of the circuit breaker, the power supply comprises a rectifying circuit, a resistor and a voltage stabilizing tube, and the power supply is rectified by the rectifying circuit and then subjected to voltage reduction by the resistor and the voltage stabilizing tube to obtain direct current.
10. The utility model provides a circuit breaker, includes zero sequence transformer and trip coil, its characterized in that: a residual current protection circuit as claimed in any one of claims 1 to 9 is connected to the main line of the circuit breaker, wherein the leakage detection and protection module is connected to the zero sequence transformer, and the execution module is connected to the trip coil and is capable of controlling the trip coil to be powered on or powered off.
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| CN202120267340.6U CN214958674U (en) | 2021-01-29 | 2021-01-29 | Circuit breaker and residual current protection circuit thereof |
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| CN202120267340.6U CN214958674U (en) | 2021-01-29 | 2021-01-29 | Circuit breaker and residual current protection circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116540148A (en) * | 2023-07-06 | 2023-08-04 | 江苏展芯半导体技术有限公司 | Leakage test circuit of TBU device under high pressure |
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2021
- 2021-01-29 CN CN202120267340.6U patent/CN214958674U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116540148A (en) * | 2023-07-06 | 2023-08-04 | 江苏展芯半导体技术有限公司 | Leakage test circuit of TBU device under high pressure |
| CN116540148B (en) * | 2023-07-06 | 2023-09-05 | 江苏展芯半导体技术有限公司 | Leakage test circuit of TBU device under high pressure |
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