CN214958673U - Circuit breaker and residual current protection circuit thereof - Google Patents
Circuit breaker and residual current protection circuit thereof Download PDFInfo
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- CN214958673U CN214958673U CN202120267070.9U CN202120267070U CN214958673U CN 214958673 U CN214958673 U CN 214958673U CN 202120267070 U CN202120267070 U CN 202120267070U CN 214958673 U CN214958673 U CN 214958673U
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Abstract
The utility model provides a circuit breaker and residual current protection circuit thereof, includes the electric leakage detection and the protection module that connect gradually, signal processing module, execution module and provides operating voltage's power supply for the three respectively, electric leakage detection is connected on the main line of circuit breaker with protection module, and electric leakage detection and protection module real-time detection main line's leakage value and can export trip signal to signal processing module, and signal processing module handles trip signal and last output high level to execution module, execution module is including the self-shutdown circuit that can control the trip coil of circuit breaker and gain or lose electricity, and the high level of continuous output makes the self-shutdown circuit switched on and turn off by oneself after switching on a period. The utility model discloses a circuit breaker and residual current protection circuit thereof, through setting up the electricity that gains of self-turn-off circuit control trip coil in execution module, avoid causing trip coil long-term circular telegram to be burnt out because of faults such as mechanism jamming.
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 equipment commonly used, and common residual current protection circuit breaker adopts earth leakage protection chip collocation silicon controlled rectifier to protect usually, and under normal conditions, when taking place the electric leakage in the circuit, the circuit breaker is when carrying out earth leakage protection action, and the silicon controlled rectifier switches on the action of drive trip coil and then makes the product break off the brake. However, because the thyristor is a semi-controlled device driven by current, after the thyristor is switched on, if the thyristor cannot be tripped due to faults such as mechanism clamping stagnation and the like, the trip coil is continuously electrified until the thyristor is burnt out.
Disclosure of Invention
An object of the utility model is to overcome prior art's defect, provide one kind and can guarantee trip coil effective action and not by the circuit breaker that burns out and residual current protection circuit thereof.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a residual current protection circuit, includes the electric leakage detection that connects gradually and protection module, signal processing module, execution module and provides operating voltage's power supply for residual current protection circuit, electric leakage detection is connected on the main line of circuit breaker with protection module, whether electric leakage detection and protection module real-time detection main line leak electricity to when the electric leakage to signal processing module output tripping signal, signal processing module handles tripping signal and last output high level to execution module, execution module gets to the electricity or loses the self-shutdown circuit of electricity including the trip coil that can control the circuit breaker, and the high level of continuous output makes the self-shutdown circuit switched on and turn off by oneself after switching on a period.
Further, the self-turn-off circuit comprises a first switching element, a second switching element and a charging element, wherein the first switching element is used for controlling the self-turn-off circuit to be turned on or off, and the second switching element is matched with the charging element to turn off the first switching element;
when the signal processing module begins to output a high level, the first switch element is conducted to enable the self-turn-off circuit to be conducted, the trip coil of the circuit breaker is electrified and disconnected, along with the continuous output of the high level of the signal processing module, the charging element is charged to enable the second switch element to be conducted, the first switch element is turned off to enable the self-turn-off circuit to be turned off, and the trip coil of the circuit breaker is not electrified.
And the power supply is connected with the electric leakage detection and protection module and the signal processing 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 signal processing module respectively after detecting that the voltage value is greater than a preset voltage value.
Further, the signal processing module comprises a signal processing chip and a first conduction element connected between the signal processing chip and the electric leakage detection circuit, the electric leakage detection and protection module continuously outputs a high-level pulse tripping signal to the signal processing module, the first conduction element is conducted to enable the signal processing chip to obtain a trigger signal of a rising edge, and the signal processing chip continuously outputs a high level to the execution module.
Further, the signal processing module comprises a second conduction element connected between the leakage detection and protection module and the execution module, the leakage detection and protection module continuously outputs t milliseconds of pulse tripping signals to the signal processing module, and the second conduction element is conducted to the execution module to continuously output high level.
Further, the self-shutdown circuit comprises a diode D9, a MOS transistor Q4, a transistor Q3, a resistor R18, a resistor R19, a resistor R21, and a capacitor C11, wherein one end of the resistor R18 and one end of the resistor R21 are connected to the signal processing module, the other end of the resistor R18, one end of the resistor R19, 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 D9 and a second terminal of the trip coil, a cathode of the diode D9 and a first terminal of the trip coil are respectively connected to the power supply, and the other end of the resistor R19, a cathode of the capacitor C11, an emitter of the transistor Q3, and a source of the transistor Q4 are connected together and to GND.
Further, the power monitoring module comprises a resistor R13, a resistor R14, a resistor R16, a transistor Q1 and a capacitor C8, 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 a base of the transistor Q1 are connected with one end of a resistor R14, one end of the capacitor C8 is connected with a collector of the transistor Q1 and one end of the resistor R16, one end of the capacitor C8 serves as an output end of the power monitoring module, and the other ends of the capacitor C8, the resistor R14 and the resistor R16 are connected with GND.
Further, the leakage detection and protection module includes a chip U1, a resistor R1, a resistor R4, a resistor R5, a capacitor C5, and a voltage clamping element D5, where the capacitor C5, the resistor R5, and the voltage clamping element D5 are connected IN parallel to two ends of a zero-sequence transformer of the circuit breaker, one ends of the resistor R5 and the resistor R5 are respectively connected to two ends of the zero-sequence transformer, the other ends of the resistor R5 and the resistor R5 are respectively connected to an IN 5 pin and an IN 5 pin of the chip U5, the capacitor C5 is connected IN parallel to the IN 5 pin and the IN 5 pin of the chip U5, an OS pin of the chip U5 is connected to the signal processing module and outputs a trip signal to the signal processing module, the pin of the chip U5 is connected to the power supply monitoring module, and one end of an anode of the capacitor C5 and one end of the capacitor C5 and the capacitor C5 of the chip 5 is connected to the capacitor VDD of the chip U5, One end of the capacitor C9, one end of the resistor R8, and one end of the resistor R15 are connected to the PC pin, the VDD pin, the DLY pin, the OA pin, the MODE pin, and the PR pin of the chip U1, respectively, and the cathode of the capacitor C5, the other end of the capacitor C6, the other end of the capacitor C7, the other end of the capacitor C9, the other end of the resistor R8, the other end of the resistor R15, and the VSS pin of the chip U1 are connected to GND.
Further, the signal processing module includes a chip U2, a resistor R17, a resistor R20, a resistor R22, a resistor R23, a resistor 24, a capacitor C10, a capacitor C12, and a transistor Q2, the transistor Q2 and the chip U2 cooperate as a first conducting element, a base of the transistor Q2 is connected to the leakage detection and protection module, a collector of the transistor Q2 is connected to the power supply monitoring module, an emitter of the transistor Q2 is connected to a CP pin of the chip U2, one end of the resistor R17 and one end of the capacitor C10 are connected to a base of the transistor Q2, one end of the resistor R22 is connected to a collector of the transistor Q2, the other end of the resistor R22 is connected to a D pin of the chip U2, a Q pin of the chip U2 is connected to the execution module and outputs a high level to the execution module, a VCC pin of the chip U2, one end of the capacitor C2, one end of the resistor R2 and one end of the resistor R2 are connected to the power supply monitoring module, the other end of the resistor R23 and the other end of the resistor R24 are connected to the SD pin and the RD pin of the chip U2, respectively, and the other end of the resistor R17, the other end of the resistor R20, the other end of the capacitor C10, the other end of the capacitor C12, and the GND pin of the chip U2 are connected to GND.
Further, the signal processing module comprises a controlled silicon D10, a resistor R18 and a capacitor C10, the controlled silicon D10 is used as a second conduction element, the anode of the controlled silicon D10 is connected with the power supply monitoring module, the gate of the controlled silicon D10 is connected with the leakage detection and protection module, the cathode of the controlled silicon D10 is connected with the execution module and outputs high level to the execution module, one end of the capacitor C10 and one end of the resistor R18 are respectively connected with the gate and the cathode of the controlled silicon D10, and the other end of the capacitor C10 and the other end of the resistor R18 are connected with GND.
A circuit breaker comprises a trip coil and a zero sequence transformer, 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, through set up the self-shutdown circuit in the execution module, when the self-shutdown circuit switches on, make trip coil get the electricity, trip coil disconnection action makes circuit breaker dropout outage, after the self-shutdown circuit switches on a terminal time, the self-shutdown circuit is turn-offed, makes trip coil lose the 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 because of faults such as mechanism jamming.
In addition, the first switch element of the self-turn-off circuit is turned off by the second switch element in a matched mode with the charging element, the turn-off time of the first switch element can be adjusted by adjusting the charging element, and 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.
In addition, the tripping signal output by the leakage detection and protection module can be subjected to signal capture and external output to keep a high level through the cooperation of the triode and the chip or through the silicon controlled rectifier, so that the normal operation of the residual current protection circuit is ensured.
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 a signal processing module in a residual current protection circuit (a first embodiment of the present invention);
fig. 5 is a circuit diagram of a signal processing module in a residual current protection circuit (a second embodiment) of the present invention;
fig. 6 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 6. The utility model discloses a circuit breaker and residual current protection circuit thereof is not limited to the description of following embodiment.
The utility model provides a residual current protection circuit, includes the electric leakage detection that connects gradually and protection module, signal processing module, execution module and provides operating voltage's power supply for residual current protection circuit, electric leakage detection is connected on the main line of circuit breaker with protection module, whether electric leakage detection and protection module real-time detection main line leak electricity to when the electric leakage to signal processing module output tripping signal, signal processing module handles tripping signal and last output high level to execution module, execution module gets to the electricity or loses the self-shutdown circuit of electricity including the trip coil that can control the circuit breaker, and the high level of continuous output makes the self-shutdown circuit switched on and turn off by oneself after switching on a period.
The utility model discloses a circuit breaker and residual current protection circuit thereof, through set up the self-shutdown circuit in the execution module, when the self-shutdown circuit switches on, make trip coil get the electricity, trip coil disconnection action makes circuit breaker dropout outage, after the self-shutdown circuit switches on a terminal time, the self-shutdown circuit is turn-offed, makes trip coil lose the 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 because of faults such as mechanism jamming.
The residual current protection circuit is described in detail with reference to fig. 1-6, and comprises a leakage detection and protection module, a signal processing module, an execution module and a power supply for providing working voltage for the three, which are connected in sequence, preferably, a power supply monitoring module is connected to the power supply, the leakage detection and protection module and the signal processing module acquire the working voltage from the power supply 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 the working voltage to the 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 comprises a rectifying circuit, a resistor and a voltage stabilizing tube, and 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, the leakage detection and protection module detects whether the main line leaks electricity in real time and outputs a tripping signal (marked as SCR) to the signal processing module when the main line leaks electricity, the leakage detection and protection module detects the leakage value of the main line in real time to judge whether the main line leaks electricity, the signal processing module processes the tripping signal and then continuously outputs a high level to the execution module, the execution module comprises a self-turn-off circuit capable of controlling a tripping coil of the circuit breaker to be powered on or powered off, the self-turn-off circuit comprises a first switch element, a second switch element and a charging element, the first switch element is used for controlling the self-turn-off circuit to be turned on or off, the second switch element and the charging element are matched for turning off the first switch element, and when the signal processing module starts to output the high level, the first switch element is turned on to turn on the self-turn-off circuit, the trip coil of circuit breaker gets the electricity disconnection, along with signal processing module continuously outputs the high level, the charging element charges and makes the second switch element switch on, first switch element cuts off and makes self-shutdown circuit shutoff, the trip coil of circuit breaker loses the electricity, so, the high level of continuously outputting by signal processing module makes self-shutdown circuit switched on and cut off by oneself after switching on a period of time, make no matter trip coil does the action and all is in the power-off state, effectively avoid causing trip coil long-term circular telegram to be burnt out because of reasons such as mechanism jamming, in addition, can realize the regulation to first switch element turn-off time through adjusting the charging element.
The signal processing module is connected with the leakage detection and protection module and used for processing a tripping signal output by the leakage detection and protection module, generally converting a tripping signal SCR output by the leakage detection and protection module into a voltage signal, and continuously outputting a high level when the tripping signal SCR is converted from a low voltage to a high level.
With reference to fig. 2, a specific connection manner between a power supply and a power monitoring module is provided, where the power supply includes a diode D1, a resistor R1, a zener diode D1, and a capacitor C1, cathodes of the diode D1, and the diode D1 are connected to a trip coil and an execution module, cathodes of the diode D1, and the diode D1 are connected to anodes of the diode D1, and the diode D1, the resistor R1, and the resistor R1 are connected in series, where one end of the resistor R1 is connected to the trip coil and the execution module, one end of the resistor R1 is connected as an output end of the power supply monitoring module, and the resistor R1 is connected in parallel to both ends of the resistor R1, a resistor R7 is connected in parallel with two ends of the resistor R6, a resistor R10 is connected in parallel with two ends of the resistor R9, a resistor R12 is connected in parallel with two ends of the resistor R11, a capacitor C4 and a cathode of a zener diode D4 are connected with one end of the resistor R11, and the other end of a capacitor C4, an anode of the zener diode D8, an anode of the diode D2, an anode of the diode D4 and an anode of the diode D6 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 R16, a triode Q1 and a capacitor C8, one end of the resistor R13 and an emitter of the triode Q1 are connected with a power supply, namely, the emitter is connected to one end of the resistor R11, the other end of the resistor R13 and a base of the triode Q1 are connected with one end of the resistor R14, one end of the capacitor C8 is connected with a collector of the triode Q1 and one end of the resistor R16 respectively, one end of the capacitor C8 serves as an output end of the power supply monitoring module, and the other ends of the capacitor C8, the resistor R14 and the resistor R16 are connected with GND. The resistor R13 and the resistor R14 are voltage dividing resistors, when the voltage output by the power supply is greater than a certain value, the transistor Q1 is turned on, and at this time, the power supply monitoring module outputs the working voltage to the leakage detection and protection module and the signal processing module, for example, when one end of the resistor R11, which is output by the power supply, outputs a voltage greater than 4.4V, the power supply monitoring module can output a 5V working power supply, and when one end of the resistor R11 outputs a voltage less than 4.4V, the power supply monitoring module outputs a working voltage of 0V.
A specific connection manner of the electrical leakage detection and protection module is provided with reference to fig. 3, the electrical leakage detection and protection module includes a chip U1, a resistor R1, a resistor R4, a resistor R5, a resistor R8, a resistor R15, a capacitor C2, and a voltage clamping element D2, the capacitor C2, the resistor R2, and the voltage clamping element D2 are connected IN parallel to two ends of a zero sequence transformer (P2 IN fig. 3) of the circuit breaker, the voltage clamping element D2 can ensure that a voltage input to the chip U2 is ± 0.7V, one ends of the resistor R2 and the resistor R2 are respectively connected to two ends of the zero sequence transformer, the other ends of the resistor R2 and the resistor R2 are respectively connected to an IN2 pin and an IN pin of the chip U2, the capacitor C2 is connected IN parallel to an IN pin of the chip U2, and the chip OS pin of the chip U2 is connected to a signal processing module for outputting a trip signal, the VDD pin of the chip U1 is connected to the power supply monitoring module, the anode of the capacitor C5, one end of the capacitor C6, one end of the capacitor C7, one end of the capacitor C9, one end of the resistor R8, and one end of the resistor R15 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 C5, the other end of the capacitor C6, the other end of the capacitor C7, the other end of the capacitor C9, the other end of the resistor R8, the other end of the resistor R15, and the VSS pin of the chip U1 are connected to GND. The chip U1 is preferably a leakage protection chip, which may be a conventional chip 54123,54133, FM2149, or the like, in this embodiment, a FM2149 chip of double-denier microelectronics is adopted, and when it is detected that leakage satisfies an action value, pin 1 of the chip U1, that is, pin OS, outputs a pulse trip signal of about 30ms to the outside.
The signal processing module is used for processing the received trip signal and providing an embodiment of a first signal processing module, the signal processing module comprises a signal processing chip and a first conduction element connected between the signal processing chip and the electric leakage detection circuit, the electric leakage detection and protection module continuously outputs a high-level pulse trip signal to the signal processing module, the first conduction element conducts a trigger signal which enables the signal processing chip to obtain a rising edge, the signal processing chip continuously outputs a high level to the execution module, wherein the signal processing chip can select various types of single-channel D triggers, and specific models can be selected as: 74LVC1G 74.
In a specific connection manner of this embodiment, provided in conjunction with fig. 4, the signal processing module includes a chip U2, a resistor R17, a resistor R20, a resistor R22, a resistor R23, a resistor 24, a capacitor C10, a capacitor C12, and a transistor Q2, the transistor Q2 and the chip U2 cooperate as a first conducting element, a base of the transistor Q2 is connected to the leakage detection and protection module, a collector of the transistor Q2 is connected to the power supply monitoring module, an emitter of the transistor Q2 is connected to a CP pin of the chip U2, one end of a resistor R17 and one end of a capacitor C10 are connected to a base of the transistor Q2, one end of a resistor R22 is connected to a collector of the transistor Q2, the other end of a resistor R22 is connected to a D pin of the chip U2, a Q pin of the chip U2 is connected to the execution module and outputs a high level to the execution module, a VCC pin of the chip U2, one end of the capacitor C2, one end of the resistor R2 is connected to the power supply monitoring module, the other end of the resistor R23 and the other end of the resistor R24 are connected to the SD pin and the RD pin of the chip U2, respectively, and the other end of the resistor R17, the other end of the resistor R20, the other end of the capacitor C10, the other end of the capacitor C12, and the GND pin of the chip U2 are connected to GND.
When the leakage protection occurs, the chip U2 continuously outputs a pulse trip signal, which is at a high level, when the transistor Q2 is turned on, the CP pin of the chip U2 obtains a trigger signal of a rising edge, and the Q pin of the chip U2 outputs the trigger voltage Vtrip, which is changed from a low level to a high level and is kept at a high level.
An embodiment of the second signal processing module is provided, where the signal processing module includes a second conduction element connected between the leakage detection and protection module and the execution module, the leakage detection and protection module continuously outputs a t-millisecond pulse trip signal, preferably a 30ms pulse trip signal, to the signal processing module, and the second conduction element is led to the execution module to continuously output a high level, and preferably, the second conduction element is a thyristor.
A specific connection manner of this embodiment is provided with reference to fig. 5, the signal processing module includes a thyristor D10, a resistor R18, and a capacitor C10, the thyristor D10 is used as a second conduction element, an anode of the thyristor D10 is connected to the power supply monitoring module, a gate of the thyristor D10 is connected to the leakage detection and protection module, a cathode of the thyristor D10 is connected to the execution module and outputs a high level to the execution module, one end of the capacitor C10 and one end of the resistor R18 are respectively connected to the gate and the cathode of the thyristor D10, and the other end of the capacitor C10 and the other end of the resistor R18 are connected to GND.
When the leakage protection occurs, the signal processing module continuously outputs a pulse signal of about 30ms to trigger the thyristor D10 to be switched on, and the signal processing module continuously outputs a high level to the execution module at the moment by utilizing the principle that the thyristor D10 can be switched off only when negative voltage is supplied after being switched on.
The execution module comprises a self-turn-off circuit, a first switch element of the self-turn-off circuit is conducted to enable the self-turn-off circuit to be conducted, a tripping coil of the circuit breaker is electrified and disconnected, a charging element is charged to enable a second switch element to be conducted, the first switch element is turned off, the self-turn-off circuit is turned off, the tripping coil of the circuit breaker is powered off, the first switch element is preferably an MOS (metal oxide semiconductor) tube, the second switch element is preferably a triode, the charging element is a capacitor, and the conduction time of the self-turn-off circuit can be adjusted by adjusting the charging time of the capacitor.
A specific connection manner of the execution module is provided in conjunction with fig. 6, wherein the self-shutdown circuit includes a diode D9, a MOS transistor Q4, a transistor Q3, a resistor R18, a resistor R19, a resistor R21, and a capacitor C11, one ends of the resistor R18 and the resistor R21 are connected to the signal processing module, the other end of the resistor R18, one end of the resistor R19, 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 D9 and a second terminal of the trip coil, a cathode of the diode D9 and a first terminal of the trip coil are respectively connected to the power supply, and the other end of the resistor R19, a cathode of the capacitor C11, an emitter of the transistor Q3, and a source of the transistor Q4 are connected to GND. The first switching element is a MOS transistor Q4, the second switching element is a transistor Q3, and the charging element is a capacitor C11. The trigger voltage Vtrip output by the Q pin of the chip U2 is applied to the gate of the MOS transistor Q4, turning on the MOS transistor Q4.
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 (11)
1. A residual current protection circuit, characterized by: including the electric leakage detection who connects gradually and protection module, signal processing module, execution module and for residual current protection circuit provides operating voltage's power supply, electric leakage detection is connected on the main line of circuit breaker with protection module, whether electric leakage detection and protection module real-time detection main line leak electricity to signal processing module output tripping signal when the electric leakage, signal processing module handles tripping signal and continues output high level to execution module, execution module is including the self-shutdown circuit that can control the trip coil of circuit breaker and get electricity or lose electricity, and the high level of continuous output makes self-shutdown circuit switched on and turn off by oneself after switching on a period.
2. A residual current protection circuit according to claim 1, characterized in that: the self-turn-off circuit comprises a first switch element, a second switch element and a charging element, wherein the first switch element is used for controlling the self-turn-off circuit to be switched on or off, and the second switch element is matched with the charging element to be used for switching off the first switch element;
when the signal processing module begins to output a high level, the first switch element is conducted to enable the self-turn-off circuit to be conducted, the trip coil of the circuit breaker is electrified and disconnected, along with the continuous output of the high level of the signal processing module, the charging element is charged to enable the second switch element to be conducted, the first switch element is turned off to enable the self-turn-off circuit to be turned off, and the trip coil of the circuit breaker is not electrified.
3. A residual current protection circuit according to claim 1 or 2, wherein: the power supply is connected with the electric leakage detection and protection module and the signal processing 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 signal processing module respectively after the voltage value is detected to be greater than the preset voltage value.
4. A residual current protection circuit according to claim 3, wherein: the signal processing module comprises a signal processing chip and a first conduction element connected between the signal processing chip and the electric leakage detection circuit, the electric leakage detection and protection module continuously outputs a high-level pulse tripping signal to the signal processing module, the first conduction element conducts to enable the signal processing chip to obtain a trigger signal of a rising edge, and the signal processing chip continuously outputs a high level to the execution module.
5. A residual current protection circuit according to claim 3, wherein: the signal processing module comprises a second conduction element connected between the electric leakage detection and protection module and the execution module, the electric leakage detection and protection module continuously outputs t milliseconds of pulse tripping signals to the signal processing module, and the second conduction element is conducted to the execution module to continuously output high level.
6. A residual current protection circuit according to claim 3, wherein: the self-turn-off circuit comprises a diode D9, a MOS tube Q4, a triode Q3, a resistor R18, a resistor R19, a resistor R21 and a capacitor C11, wherein one ends of the resistor R18 and the resistor R21 are connected with the signal processing module, the other end of the resistor R18, one end of the resistor R19 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 D9 and the second terminal of the trip coil, the cathode of the diode D9 and the first terminal of the trip coil are respectively connected with a power supply, and the other end of the resistor R19, the cathode of the capacitor C11, the emitter of the triode Q3 and the source of the MOS tube Q4 are connected together and connected with GND.
7. A residual current protection circuit according to claim 3, wherein: the power supply monitoring module comprises a resistor R13, a resistor R14, a resistor R16, a triode Q1 and a capacitor C8, 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 a base of the triode Q1 are connected with one end of a resistor R14, one end of the capacitor C8 is connected with a collector of the triode Q1 and one end of the resistor R16 respectively, one end of the capacitor C8 serves as an output end of the power supply monitoring module, and the other ends of the capacitor C8, the resistor R14 and the resistor R16 are connected with GND.
8. A residual current protection circuit according to claim 3, wherein: the electric leakage detection and protection module comprises a chip U1, a resistor R1, a capacitor C1 and a voltage clamping element D1, wherein the capacitor C1, the resistor R1 and the voltage clamping element D1 are connected IN parallel at two ends of a zero-sequence transformer of the circuit breaker, one ends of the resistor R1 and the resistor R1 are respectively connected with two ends of the zero-sequence transformer, the other ends of the resistor R1 and the resistor R1 are respectively connected with 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 a signal processing module and outputs a tripping signal to the signal processing module, a pin of the chip U1 is connected with a power supply monitoring module VDD, an anode of the capacitor C1, one end of the capacitor C1 and one end of the capacitor C1 are connected with a signal processing module, One end of the resistor R8 and one end of the resistor R15 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 C5, the other end of the capacitor C6, the other end of the capacitor C7, the other end of the capacitor C9, the other end of the resistor R8, the other end of the resistor R15, and the VSS pin of the chip U1 are connected to GND.
9. A residual current protection circuit according to claim 4, characterized in that: the signal processing module comprises a chip U2, a resistor R17, a resistor R20, a resistor R22, a resistor R23, a resistor 24, a capacitor C10, a capacitor C12 and a triode Q2, wherein the triode Q2 and the chip U2 are matched to be used as a first conducting element, the base of the triode Q2 is connected with the leakage detection and protection module, the collector of the triode Q2 is connected with the power supply monitoring module, the emitter of the triode Q2 is connected with the CP pin of the chip U2, one end of the resistor R17 and one end of the capacitor C10 are connected with the base of the triode Q2, one end of the resistor R22 is connected with the collector of the triode Q2, the other end of the resistor R22 is connected with the D pin of the chip U2, the Q pin of the chip U2 is connected with the execution module and outputs high level to the execution module, the VCC pin of the chip U2, one end of the capacitor C12, one end of the resistor R23 and one end of the resistor R24 are connected with the other end of the power supply monitoring module, and the other end of the resistor R23 is connected with the power supply monitoring module, The other end of the resistor R24 is connected to the SD pin and the RD pin of the chip U2, and the other end of the resistor R17, the other end of the resistor R20, the other end of the capacitor C10, the other end of the capacitor C12, and the GND pin of the chip U2 are connected to GND.
10. A residual current protection circuit according to claim 5, characterized in that: the signal processing module comprises a controllable silicon D10, a resistor R18 and a capacitor C10, the controllable silicon D10 is used as a second conducting element, the anode of the controllable silicon D10 is connected with the power supply monitoring module, the gate of the controllable silicon D10 is connected with the leakage detection and protection module, the cathode of the controllable silicon D10 is connected with the execution module and outputs high level to the execution module, one end of the capacitor C10 and one end of the resistor R18 are respectively connected with the gate and the cathode of the controllable silicon D10, and the other end of the capacitor C10 and the other end of the resistor R18 are connected with GND.
11. The utility model provides a circuit breaker, includes trip coil and zero sequence transformer, its characterized in that: a residual current protection circuit as claimed in any one of claims 1 to 10 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120267070.9U CN214958673U (en) | 2021-01-29 | 2021-01-29 | Circuit breaker and residual current protection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120267070.9U CN214958673U (en) | 2021-01-29 | 2021-01-29 | Circuit breaker and residual current protection circuit thereof |
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| Publication Number | Publication Date |
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| CN214958673U true CN214958673U (en) | 2021-11-30 |
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| CN202120267070.9U Active CN214958673U (en) | 2021-01-29 | 2021-01-29 | Circuit breaker and residual current protection circuit thereof |
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| CN (1) | CN214958673U (en) |
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