CN209805398U - A protection circuit for filling electric pile - Google Patents

A protection circuit for filling electric pile Download PDF

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Publication number
CN209805398U
CN209805398U CN201920801418.0U CN201920801418U CN209805398U CN 209805398 U CN209805398 U CN 209805398U CN 201920801418 U CN201920801418 U CN 201920801418U CN 209805398 U CN209805398 U CN 209805398U
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CN
China
Prior art keywords
circuit
bridge rectifier
capacitor
diode bridge
protection circuit
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CN201920801418.0U
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Chinese (zh)
Inventor
刘崇汉
李�杰
赵阳
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Chongqing State John Energy Developments Ltd
Chongqing Guohan Energy Development Co Ltd
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Chongqing State John Energy Developments Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/12Electric charging stations

Abstract

The utility model provides a protection circuit for filling electric pile contains single-phase electric power line source, single-phase electric power line source contains live wire, zero line and ground wire, still contains microprocessor, is used for detecting whether balanced earth leakage protection circuit of live wire and zero line electric current and is used for monitoring whether ground connection is good and the monitoring circuit that live wire zero line connects well, monitoring circuit and earth leakage protection circuit are connected with microprocessor respectively. Through on the protection circuit who fills electric pile plus be used for detecting the electric leakage protection circuit whether balanced of live wire and zero line electric current and be used for monitoring the ground connection monitoring circuit whether good of ground connection, can monitor the electric leakage, the power consumption condition of filling electric pile in real time, in case take place that equipment ground connection is bad, shell electric leakage, live wire zero line connect the condition such as reverse, can in time cut off the power supply, avoid personnel to use live equipment to charge and electrocute, receive the injury.

Description

A protection circuit for filling electric pile
Technical Field
The utility model relates to a fill the electric pile field, concretely relates to a protection circuit for filling electric pile.
Background
At present, along with the increase of electric automobiles, in order to meet the charging requirement in the operation process of the electric automobiles, charging piles are widely applied, alternating-current charging piles are power supply equipment for providing alternating current for new energy automobiles, equipment which can be in direct contact with people and automobiles is very important in safety, a charging gun is connected with a charging seat of the electric automobiles to supply power to a vehicle-mounted charger, the vehicle-mounted charger charges a power battery, but in actual use, the current charging pile equipment is provided with a large number of safety protection measures which usually belong to passive protection, so that the current charging pile equipment cannot actively and effectively prevent the potential leakage hazard existing in the operation process of the charging pile equipment and the electric shock accident caused by misoperation of an operator, the use safety of the current charging pile is relatively insufficient, and once the equipment is in poor grounding state, the charging pile is not widely applied, The situations of reverse connection of a live wire and a zero line, shell leakage and the like cannot be detected in a charging system, a charging system loop cannot be disconnected, a charging person is easy to get an electric shock, and the personal safety of a crisis is; aiming at the problem, the currently used charging pile needs to be optimized urgently so as to meet the requirement of ensuring the charging safety.
SUMMERY OF THE UTILITY MODEL
Not enough to exist among the prior art, the utility model provides a protection circuit for filling electric pile, its aim at solve the problem of bad, the shell electric leakage of equipment ground connection.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
The utility model provides a protection circuit for filling electric pile, contains single-phase electric power line source, single-phase electric power line source contains live wire, zero line and ground wire, still contains microprocessor, is used for detecting whether balanced earth leakage protection circuit of live wire and zero line electric current and is used for monitoring whether ground connection is good and the monitoring circuit whether live wire zero line connects well, monitoring circuit and earth leakage protection circuit are connected with microprocessor respectively.
Furthermore, the leakage protection circuit comprises a control chip U1, the control chip U1 comprises a current sampling module, a voltage sampling module, an analog data conversion module, a digital signal processing module, a clock circuit, a signal reset module, a voltage reference end and a data transmission module, the current sampling module and the voltage sampling module are connected with the digital signal processing module through the analog data conversion module, the digital signal processing module is further connected with the data transmission module and the clock circuit, the analog data conversion module is further connected with a reference voltage end, and the reference voltage end is grounded after being connected with a capacitor C3 and a capacitor C4 in parallel; the current sampling module is used for collecting live wire input current and zero line input current, the voltage sampling module is used for collecting voltage, and the data transmission module is in communication connection with the microprocessor.
Further, a crystal oscillator circuit is externally connected to the clock circuit, and the crystal oscillator circuit comprises a crystal oscillator Y1, a capacitor C1 and a capacitor C2; one end of the capacitor C1 is respectively connected with one end of the crystal oscillator Y1 and the control chip U1, and the other end of the capacitor C1 is connected with one end of the capacitor C2 and grounded; the other end of the capacitor C2 is connected to the other end of the crystal resonator Y1 and the control chip U1, respectively.
Further, the control chip U1 is powered by an external 5V positive power supply.
Further, the monitoring circuit comprises a diode bridge rectifier circuit B1, a diode bridge rectifier circuit B2, two resistance voltage division circuits and two optical coupling isolation circuits, wherein the two resistance voltage division circuits and the two optical coupling isolation circuits are respectively connected with the diode bridge rectifier circuit B1 and the diode bridge rectifier circuit B2 in a one-to-one correspondence manner, the two resistance voltage division circuits are respectively a first resistance voltage division circuit and a second resistance voltage division circuit which are identical in structure, and the two optical coupling isolation circuits are respectively a first optical coupling isolation circuit and a second optical coupling isolation circuit which are identical in structure; the positive electrode of the diode bridge rectifier circuit B1 is connected with a live wire, the negative electrode of the diode bridge rectifier circuit B1 is connected with the positive electrode of the diode bridge rectifier circuit B2 and then grounded, and the negative electrode of the diode bridge rectifier circuit B2 is connected with a zero line; one end of the alternating current output end of the diode bridge rectifier circuit B1 and the alternating current output end of the diode bridge rectifier circuit B2 are respectively connected with the corresponding first optical coupling isolation circuits, the other end of the alternating current output end of the diode bridge rectifier circuit B2 is connected with the input end of the first optical coupling isolation circuits after passing through the corresponding first resistance voltage division circuits, and the output end of the first optical coupling isolation circuits is connected with the microprocessor.
Furthermore, the first resistor voltage division circuit comprises five resistors which are sequentially connected in series, one end of each resistor is connected with the alternating current output end of the corresponding diode bridge rectifier circuit after the resistors are connected in series, and the other end of each resistor is connected with the corresponding optical coupling isolation circuit.
Further, the first optical coupler isolation circuit comprises an optical coupler, a capacitor C5, a capacitor C6, a resistor R1 and a resistor R2, the optical coupler comprises a light emitting diode D1 and a triode T1, an anode of the diode D1 is connected with a resistor voltage dividing circuit, a cathode of the diode D1 is connected with an alternating current output end of the corresponding diode bridge rectifier circuit, a capacitor C5 is connected in parallel between a connecting end of the anode of the diode D1 and the resistor voltage dividing circuit and a connecting end of a cathode of the diode D1 and the alternating current output end, an emitter of the triode T1 is connected to a reference ground, an emitter of the triode T1 is further connected with a collector of the triode T1 through a capacitor C6, one end of the connecting end is connected to the corresponding output end through a resistor R2, the output end is connected with the microprocessor, and the other end is connected to.
Compared with the prior art, the utility model discloses following beneficial effect has:
Through on the protection circuit who fills electric pile add be used for detecting whether balanced earth leakage protection circuit of live wire and zero line electric current and be used for monitoring whether good monitoring circuit of ground connection, can monitor the electric leakage, the power consumption condition of filling electric pile in real time, in case take place that equipment ground connection is bad, shell electric leakage, live wire zero line connect the condition such as anti-reverse, can in time cut off the power supply, avoid taking place the electric shock accident among the charging process, receive the injury.
Drawings
FIG. 1 is a diagram of the leakage protection circuit of the present invention,
Figure 2 is a schematic diagram of the control chip U1 of the present invention,
fig. 3 is a circuit diagram of the monitoring circuit of the present invention.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the utility model provides a protection circuit for filling electric pile contains single-phase electric power line source, single-phase electric power line source contains live wire, zero line and ground wire, still contains microprocessor, is used for detecting whether balanced earth leakage protection circuit of live wire and zero line electric current and is used for monitoring whether ground connection is good and the monitoring circuit whether live wire zero line connects well, monitoring circuit and earth leakage protection circuit are connected with microprocessor respectively. Through improving on the protection circuit to filling electric pile, can monitor the electric leakage condition that fills electric pile in real time, in case take place that equipment ground is bad, shell electric leakage, live wire zero line connect the circumstances such as anti-reverse, can in time cut off the power supply, avoid taking place the electric shock accident among the charging process, receive the injury.
the leakage protection circuit comprises a control chip U1, the control chip U1 adopts a single-phase multifunctional electronic electric energy metering chip with the model number of BL6523GX, as shown in FIG. 2, the control chip U1 comprises a current sampling module, a voltage sampling module, an analog data conversion module, a digital signal processing module, a clock circuit, a signal resetting module, a voltage reference end and a data transmission module, the current sampling module and the voltage sampling module are connected with the digital signal processing module through the analog data conversion module, the digital signal processing module is further connected with the data transmission module and the clock circuit, the analog data conversion module is further connected with a reference voltage end, and the reference voltage end is grounded after being connected with a capacitor C3 and a capacitor C4 in parallel; the current sampling module is used for collecting live wire input current and zero line input current, the voltage sampling module is used for collecting voltage, the data transmission module is in communication connection with the microprocessor and is used for transmitting signals to the microprocessor when electric leakage occurs, and the microprocessor controls the single chip microcomputer to break off a relay of the charging pile so as to cut off power supply input.
The clock circuit is externally connected with a crystal oscillator circuit, and the crystal oscillator circuit comprises a crystal oscillator Y1, a capacitor C1 and a capacitor C2; one end of the capacitor C1 is respectively connected with one end of the crystal oscillator Y1 and the control chip U1, and the other end of the capacitor C1 is connected with one end of the capacitor C2 and grounded; the other end of the capacitor C2 is connected to the other end of the crystal resonator Y1 and the control chip U1, respectively.
The control chip U1 adopts an external 5V positive power supply to supply power.
The BL6523GX control chip can detect whether live wire and zero line current are unbalanced according to the threshold value that sets up, if the unbalance says that the electric leakage takes place, the singlechip will open the relay. An imbalance comparison threshold may be set. MODE of the operating MODE register (MODE) of the control chip U1 [11:10] can be written by a user, the default is 2' b00, the judgment threshold value representing the unbalance is 12.5%, and when the difference value of the effective values of the sampling currents of the live wire and the zero wire or the difference value of the two-phase power exceeds the set threshold value, the power utilization error indication signal FAULT is output; if the corresponding FAULT enable position in the interrupt MASK register (MASK) of the control chip U1 is logic 1, the/IRQ logic output becomes active low; when MODE [11:10] ═ 2' b11, it means that the threshold is 10.1%; when MODE [11:10] ═ 2' b10, it means that the threshold is 3.125%; when MODE [11:10] ═ 2' b01, it means that the threshold is 6.25%; when MODE [11:10] ═ 2' b00, it means that the threshold is 12.5%; through the protection circuit who fills electric pile of improvement, for ordinary electric pile that fills, can detect faults such as equipment shell electric leakage to in time cut off the power supply, avoid taking place the electric shock accident in the charging process, cause the bodily injury.
As shown in fig. 3, the monitoring circuit includes a diode bridge rectifier circuit B1, a diode bridge rectifier circuit B2, two resistor voltage-dividing circuits and two optical coupling isolation circuits, wherein the two resistor voltage-dividing circuits and the two optical coupling isolation circuits are respectively connected with the diode bridge rectifier circuit B1 and the diode bridge rectifier circuit B2 in a one-to-one correspondence manner, the two resistor voltage-dividing circuits are respectively a first resistor voltage-dividing circuit and a second resistor voltage-dividing circuit which have the same structure, and the two optical coupling isolation circuits are respectively a first optical coupling isolation circuit and a second optical coupling isolation circuit which have the same structure; the positive electrode of the diode bridge rectifier circuit B1 is connected with a live wire, the negative electrode of the diode bridge rectifier circuit B1 is connected with the positive electrode of the diode bridge rectifier circuit B2 and then grounded, and the negative electrode of the diode bridge rectifier circuit B2 is connected with a zero line; one end of the alternating current output end of the diode bridge rectifier circuit B1 and the alternating current output end of the diode bridge rectifier circuit B2 are respectively connected with the corresponding first optical coupling isolation circuits, the other end of the alternating current output end of the diode bridge rectifier circuit B2 is connected with the input end of the first optical coupling isolation circuits after passing through the corresponding first resistance voltage division circuits, and the output end of the first optical coupling isolation circuits is connected with the microprocessor.
As shown in fig. 3, the first resistor voltage-dividing circuit includes five resistors connected in series in sequence, the resistor R3, the resistor R4, the resistor R5, the resistor R6 and the resistor R7 are connected in series, one end of the resistor R7 after being connected in series is connected to the ac output end of the corresponding diode bridge rectifier circuit, and one end of the resistor R3 is connected to the corresponding optical coupling isolation circuit.
the first optical coupler isolation circuit comprises an optical coupler, a capacitor C5, a capacitor C6, a resistor R1 and a resistor R2, the optical coupler is PC817C in type, the optical coupler comprises a light emitting diode D1 and a triode T1, the anode of a diode D1 is connected with a resistor voltage division circuit, the cathode of a diode D1 is connected with the alternating current output end of a corresponding diode bridge rectifier circuit, a capacitor C5 is connected in parallel between the connecting end of the anode of a diode D1 and the resistor voltage division circuit and the connecting end of the cathode of a diode D1 and the alternating current output end, the emitter of the triode T1 is connected to a reference ground end, the emitter of the triode T1 is also connected with the collector of the triode T1 through a capacitor C6, one end of the connecting end is connected to the corresponding output end through a resistor R2, the output end is connected with a.
the grounding monitoring process of the monitoring circuit comprises the following steps: when the grounding is good, the AC _ L (live wire) is communicated with a common grounding end PE through a diode bridge rectifier circuit B1, the 220V voltage drives an optocoupler U5 to work through a resistance voltage division circuit, and G _ DET + is at a low level; and because there is no voltage difference between AC _ N (zero line) and the public earth terminal PE, the diode bridge rectifier circuit B2 is not conducted, the optical coupler U6 does not work, and G _ DET-is high level because of the pull-up resistor. When the grounding is good, G _ DET + is at low level, G _ DET-is at high level, the microprocessor collects that the output of G _ DET + is at low level, and the output of G _ DET-is at high level, the grounding is good.
When the voltage is not grounded, the AC _ L (live wire) is communicated with the AC _ N through the diode bridge rectifier circuit B1 and the diode bridge rectifier circuit B2, the 110V voltage drives the optocoupler U5 to work through the resistor voltage division circuit, and the G _ DET + is at a low level; the 110V voltage drives the optocoupler U6 to work through the resistance voltage division circuit, and G _ DET-is at a low level. That is, when there is no ground, G _ DET + is at a low level, and G _ DET-is at a low level; the microprocessor collects that G _ DET + output is low level, and when G _ DET-output is low level, the microprocessor proves that no grounding exists, and the microprocessor can transmit signals to the single chip microcomputer to disconnect the relay of the charging pile so as to cut off power input and power off in time, thereby avoiding electric shock accidents.
The live wire and zero wire reverse connection monitoring process of the monitoring circuit comprises the following steps: when the grounding is good, the live wire is connected to the AC _ L, and the zero wire is connected to the AC _ N, the live wire is communicated with the common grounding end PE through the diode bridge type rectifying circuit B1, the 220V voltage drives the optocoupler U5 to work through the resistance voltage dividing circuit, and the output of G _ DET + is low level; the AC _ N (zero line) has no voltage difference with the common grounding end PE, the diode bridge rectifying circuit B2 is not conducted, the optical coupler U6 does not work, and the G _ DET is output as high level due to the pull-up resistor R8; namely, the grounding is good, the live wire is connected to AC _ L, the zero wire is connected to AC _ N, the output of G _ DET + is low level, and the output of G _ DET-is high level. The microprocessor acquires that the output of G _ DET + is low level and the output of G _ DET-is high level, which proves that the zero line and the live line are not reversely connected.
When the grounding is good, the zero line is connected to the AC _ L, and the live line is connected to the AC _ N, the AC _ L (zero line) has no voltage difference with the public grounding end PE, the diode bridge type rectifying circuit B1 is not conducted, the optical coupler U5 does not work, and the G _ DET + is output to a high level due to the pull-up resistor R1; the AC _ N (live wire) is communicated with a common ground terminal PE through a diode bridge rectifier circuit B2, the 220V voltage drives an optocoupler U6 to work through a resistance voltage division circuit, and the output of G _ DET-is low level; namely, the grounding is good, the live wire is connected to AC _ N, the zero wire is connected to AC _ L, the output of G _ DET + is high level, and the output of G _ DET-is low level. When the microprocessor collects that the output of the G _ DET + is high level and the output of the G _ DET-is low level, the microprocessor proves that the zero line of the live wire is reversely connected, and the microprocessor can transmit signals to the single chip microcomputer to disconnect the relay of the charging pile so as to cut off the power input and cut off the power in time, thereby avoiding electric shock accidents.
The pin assignment of the microprocessor CPU is described in detail as follows:
CPU pin interface of microprocessor
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims (7)

1. The utility model provides a protection circuit for filling electric pile, contains single-phase power line source, single-phase power line source contains live wire, zero line and ground wire, its characterized in that: the grounding detection circuit also comprises a microprocessor, an electric leakage protection circuit for detecting whether the current of the live wire and the current of the zero line are balanced and a monitoring circuit for monitoring whether the grounding is good and whether the live wire and the zero line are connected, wherein the monitoring circuit and the electric leakage protection circuit are respectively connected with the microprocessor.
2. The protection circuit for a charging post according to claim 1, wherein: the leakage protection circuit comprises a control chip U1, the control chip U1 comprises a current sampling module, a voltage sampling module, an analog data conversion module, a digital signal processing module, a clock circuit, a signal reset module, a voltage reference end and a data transmission module, the current sampling module and the voltage sampling module are connected with the digital signal processing module through the analog data conversion module, the digital signal processing module is further connected with the data transmission module and the clock circuit, the analog data conversion module is further connected with the reference voltage end, and the reference voltage end is grounded after being connected with a capacitor C3 and a capacitor C4 in parallel; the current sampling module is used for collecting live wire input current and zero line input current, the voltage sampling module is used for collecting voltage, and the data transmission module is in communication connection with the microprocessor.
3. The protection circuit for a charging post according to claim 2, wherein: the clock circuit is externally connected with a crystal oscillator circuit, and the crystal oscillator circuit comprises a crystal oscillator Y1, a capacitor C1 and a capacitor C2; one end of the capacitor C1 is respectively connected with one end of the crystal oscillator Y1 and the control chip U1, and the other end of the capacitor C1 is connected with one end of the capacitor C2 and grounded; the other end of the capacitor C2 is connected to the other end of the crystal resonator Y1 and the control chip U1, respectively.
4. The protection circuit for a charging post according to claim 2, wherein: the control chip U1 adopts an external 5V positive power supply to supply power.
5. the protection circuit for a charging post according to claim 1, wherein: the monitoring circuit comprises a diode bridge rectifier circuit B1, a diode bridge rectifier circuit B2, two resistance voltage division circuits and two optical coupling isolation circuits, wherein the two resistance voltage division circuits and the two optical coupling isolation circuits are respectively connected with the diode bridge rectifier circuit B1 and the diode bridge rectifier circuit B2 in a one-to-one correspondence mode; the positive electrode of the diode bridge rectifier circuit B1 is connected with a live wire, the negative electrode of the diode bridge rectifier circuit B1 is connected with the positive electrode of the diode bridge rectifier circuit B2 and then grounded, and the negative electrode of the diode bridge rectifier circuit B2 is connected with a zero line; one end of the alternating current output end of the diode bridge rectifier circuit B1 and the alternating current output end of the diode bridge rectifier circuit B2 are respectively connected with the corresponding first optical coupling isolation circuits, the other end of the alternating current output end of the diode bridge rectifier circuit B2 is connected with the input end of the first optical coupling isolation circuits after passing through the corresponding first resistance voltage division circuits, and the output end of the first optical coupling isolation circuits is connected with the microprocessor.
6. The protection circuit for a charging post according to claim 5, wherein: the first resistor voltage division circuit comprises five resistors which are sequentially connected in series, one end of each resistor is connected with the alternating current output end of the corresponding diode bridge rectifier circuit after the resistors are connected in series, and the other end of each resistor is connected with the corresponding optical coupling isolation circuit.
7. The protection circuit for a charging post according to claim 6, wherein: the first optical coupling isolation circuit comprises an optical coupler, a capacitor C5, a capacitor C6, a resistor R1 and a resistor R2, the optical coupler comprises a light emitting diode D1 and a triode T1, the anode of a diode D1 is connected with a resistor voltage division circuit, the cathode of a diode D1 is connected with the alternating current output end of the corresponding diode bridge rectifier circuit, a capacitor C5 is connected between the connecting end of the anode of the diode D1 and the resistor voltage division circuit and the connecting end of the cathode of the diode D1 and the alternating current output end in parallel, the emitter of the triode T1 is connected to a reference ground end, the emitter of the triode T1 is also connected with the collector of the triode T1 through a capacitor C6, one end of the connecting end of the emitter is connected to the corresponding output end through a resistor R2, the output end is connected with the microprocessor, and.
CN201920801418.0U 2019-05-30 2019-05-30 A protection circuit for filling electric pile Active CN209805398U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920801418.0U CN209805398U (en) 2019-05-30 2019-05-30 A protection circuit for filling electric pile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920801418.0U CN209805398U (en) 2019-05-30 2019-05-30 A protection circuit for filling electric pile

Publications (1)

Publication Number Publication Date
CN209805398U true CN209805398U (en) 2019-12-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920801418.0U Active CN209805398U (en) 2019-05-30 2019-05-30 A protection circuit for filling electric pile

Country Status (1)

Country Link
CN (1) CN209805398U (en)

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