CN115656873A - PE grounding real-time detection circuit for alternating-current charging gun - Google Patents
PE grounding real-time detection circuit for alternating-current charging gun Download PDFInfo
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- CN115656873A CN115656873A CN202211322556.3A CN202211322556A CN115656873A CN 115656873 A CN115656873 A CN 115656873A CN 202211322556 A CN202211322556 A CN 202211322556A CN 115656873 A CN115656873 A CN 115656873A
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- photoelectric coupler
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a PE (polyethylene) grounding real-time detection circuit for an alternating current charging gun, which comprises a photoelectric coupler, wherein the anode of the input end of the photoelectric coupler is connected with a rectifier diode, the front end of the rectifier diode is connected with a current limiting resistor, the input end of the current limiting resistor is a wiring end, and a live wire and a zero line are connected to the wiring end through a voltage dividing resistor; the cathode of the input end of the photoelectric coupler is grounded with the PE; the collector of the output end of the photoelectric coupler is connected with +5V voltage, and the emitter of the output end of the photoelectric coupler is grounded through a pull-down resistor and is also connected to a level output line through an electric line; the voltage output line is used for outputting high and low levels to the digital input interface of the microcontroller. The PE grounding real-time monitoring circuit can be integrated in an electric vehicle charging device, can realize a reliable grounding continuity detection function, has the function of isolating alternating-current high voltage and a signal circuit, and improves the electromagnetic compatibility and the anti-interference capability of an alternating-current charging gun.
Description
Technical Field
The invention relates to the technical field of electronic circuit detection, in particular to a PE grounding real-time detection circuit for an alternating current charging gun.
Background
A battery charging apparatus is a power conversion device having a specific function used when charging a battery. When charging an electric vehicle, the grounding state of the vehicle is critical to its safety. If the charging device is not grounded during charging, once the vehicle has electric leakage fault, electric shock accidents can be caused when people contact the vehicle, and the body of the people is injured. Therefore, the national standard GB/T18487.1-2015 requires that a grounding continuity detection function is required inside the electric vehicle charging device.
At present, the grounding detection principle of the alternating current charging gun is that the grounding detection is carried out by utilizing ohm's law through measuring the voltage and current values of a grounding circuit. However, in this way, a resistance-capacitance element or a hall current sensor with high precision needs to be connected in series in the grounding circuit, the hall current sensor is expensive, the cost of the grounding detection circuit is high, the cost of the alternating current charging gun is greatly increased, the alternating current high voltage and the signal circuit cannot be effectively isolated, the electromagnetic compatibility is poor, and the anti-interference capability is low.
Disclosure of Invention
The invention aims to provide a PE grounding real-time detection circuit for an alternating current charging gun, which can perform grounding detection on alternating current charging money, and meanwhile, the circuit is low in cost and strong in interference resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a PE grounding real-time detection circuit for an alternating current charging gun comprises a photoelectric coupler, wherein the anode of the input end of the photoelectric coupler is connected with a rectifier diode, the front end of the rectifier diode is connected with a current limiting resistor, the input end of the current limiting resistor is a wiring end, and a live wire and a zero line are connected to the wiring end through a voltage dividing resistor; the cathode of the input end of the photoelectric coupler is grounded with the PE; the collector of the output end of the photoelectric coupler is connected with +5V voltage, and the emitter of the output end of the photoelectric coupler is grounded through a pull-down resistor and is also connected to a level output line through an electric line; the voltage output line is used for outputting high and low levels to the digital input interface of the microcontroller.
According to the invention, a voltage division circuit is formed by voltage division resistors, alternating current is divided, then loop current is limited by a current limiting resistor, and then rectified into pulsating direct current by a rectifier diode, a photoelectric coupler is driven to input into a light-emitting tube to generate a light signal, a light receiving tube of the photoelectric coupler receives the light signal of the light-emitting tube to conduct, and a +5V level is transmitted to a voltage output circuit to generate a high level; if the input end of the photoelectric coupler is not connected with the PE, the light receiving tube of the photoelectric coupler is not conducted, and the voltage output circuit generates a low level.
The PE grounding real-time monitoring circuit can be integrated in an electric vehicle charging device, can realize a reliable grounding continuity detection function, has the function of isolating an alternating-current high voltage and a signal circuit, and improves the electromagnetic compatibility and the anti-interference capability of an alternating-current charging gun.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Detailed Description
As shown in fig. 1, the PE ground real-time detection circuit for an ac charging gun provided by this embodiment includes a photoelectric coupler u1, an anode a of an input end of the photoelectric coupler u1 is connected with a diode D1, a front end of the diode D1 is connected with a resistor R3, an input end of the resistor R3 is a terminal P1, a live wire L is connected to the terminal P1 through the resistor R1, and a zero line N is connected to the terminal P1 through a resistor R2. The cathode K of the input end of the photoelectric coupler u1 is connected with the PE ground. A collector C at the output end of the photoelectric coupler u1 is connected with +5V voltage, an emitter E at the output end is grounded through a resistor R4 and is also connected to a level output line GNDTEST through an electric line; the voltage output line GNDTEST is used for outputting high and low levels to the digital input interface of the microcontroller.
In the embodiment, a voltage division circuit is formed by voltage division resistors R1 and R2 to divide alternating current, loop current is limited by a current limiting resistor R3, and then the loop current is rectified into pulsating direct current by a rectifier diode D1 to drive a photoelectric coupler u1 to input a light emitting tube to generate a light signal, a light receiving tube of the photoelectric coupler u1 receives the light signal of the light emitting tube to be conducted, and the +5V level is transmitted to a digital input interface of a microcontroller.
Specifically, 220V alternating current is divided into 110V alternating current by voltage dividing resistors R1 and R2, the drive current of the photoelectric coupler u1 is limited by a current limiting resistor R3, the drive current requirement of the photoelectric coupler u1 is met, the alternating current is rectified into pulsating direct current by a rectifier diode D1, the photoelectric coupler u1 is driven to input into a light emitting tube to generate a light signal, a light receiving tube of the photoelectric coupler u1 receives the light signal conduction of the light emitting tube, the +5V level is transmitted to a digital input interface of a microcontroller, the output E of the photoelectric coupler u1 is connected to a signal ground by a resistor R4, and R4 is a pull-down resistor of the microcontroller.
The single-phase alternating current frequency is 50Hz,220V, if the PE line is not connected, the live line L and the zero line N cannot form a circuit loop, the photoelectric coupler is not conducted, the digital input interface of the microcontroller cannot detect a high-level signal, namely a low-level signal, and at the moment, the grounding protection line can be judged not to be connected to the portable alternating current charging gun device. When the PE protection ground is connected into the circuit, the live wire L, the zero line N and the PE line form a loop, sine wave alternating current is rectified into pulsating direct current through the diode D1, the internal light emitting diode of the optocoupler is conducted to emit light, the CE is conducted, and the detection pin of the microcontroller detects high level. The microcontroller can directly judge whether the grounding is reliable or not by measuring high and low levels.
Photoelectric coupler u1 has the effect of isolating alternating current high voltage and a signal circuit, and improves the electromagnetic compatibility and the anti-interference capability of the portable alternating current charging gun.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention should be covered within the scope of the present invention.
Claims (1)
1. A PE grounding real-time detection circuit for an alternating current charging gun comprises a photoelectric coupler, wherein the anode of the input end of the photoelectric coupler is connected with a rectifier diode, the front end of the rectifier diode is connected with a current limiting resistor, the input end of the current limiting resistor is a wiring end, and a live wire and a zero line are connected to the wiring end through a voltage dividing resistor; the cathode of the input end of the photoelectric coupler is grounded with the PE; the collector of the output end of the photoelectric coupler is connected with +5V voltage, and the emitter of the output end of the photoelectric coupler is grounded through a pull-down resistor and is also connected to a level output line through an electric line; the voltage output line is used for outputting high and low levels to the digital input interface of the microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211322556.3A CN115656873A (en) | 2022-10-27 | 2022-10-27 | PE grounding real-time detection circuit for alternating-current charging gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211322556.3A CN115656873A (en) | 2022-10-27 | 2022-10-27 | PE grounding real-time detection circuit for alternating-current charging gun |
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| Publication Number | Publication Date |
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| CN115656873A true CN115656873A (en) | 2023-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211322556.3A Pending CN115656873A (en) | 2022-10-27 | 2022-10-27 | PE grounding real-time detection circuit for alternating-current charging gun |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113797A (en) * | 2021-11-12 | 2022-03-01 | 上汽通用五菱汽车股份有限公司 | Grounding resistance detection circuit and method and charging gun |
| CN115776166A (en) * | 2023-02-13 | 2023-03-10 | 深圳市锐深科技有限公司 | Circuit and method for confirming connection between electric ship and charging gun and electric ship |
-
2022
- 2022-10-27 CN CN202211322556.3A patent/CN115656873A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113797A (en) * | 2021-11-12 | 2022-03-01 | 上汽通用五菱汽车股份有限公司 | Grounding resistance detection circuit and method and charging gun |
| CN114113797B (en) * | 2021-11-12 | 2023-09-15 | 上汽通用五菱汽车股份有限公司 | Ground resistance detection circuit, method and charging gun |
| CN115776166A (en) * | 2023-02-13 | 2023-03-10 | 深圳市锐深科技有限公司 | Circuit and method for confirming connection between electric ship and charging gun and electric ship |
| CN115776166B (en) * | 2023-02-13 | 2023-05-09 | 深圳市锐深科技有限公司 | Circuit and method for confirming connection of electric ship and charging gun and electric ship |
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