New energy vehicle charging device grounding detection circuit

Abstract

The utility model belongs to the technical field of circuit grounding detection, and particularly relates to a new energy vehicle charging device grounding detection circuit comprising an isolation module, a first pin of the isolation module is connected with a live wire input end and a zero line input end, a second pin of the isolation module is connected with a PE input module, a third pin of the isolation module is grounded, and a fourth pin of the isolation module is grounded. According to the new energy vehicle charging device, a grounding fault detection circuit is simplified, the product detection stability is guaranteed, the safety of the new energy vehicle charging device in the using process is improved, the part cost is reduced, the PCB space is saved, and the new energy vehicle charging device is more convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit grounding detection, in particular to a grounding detection circuit for a charging device of a new energy vehicle. Background Art

[0002] The emergence of electric vehicles has reduced the dependence of automobiles on oil to a certain extent. Electric vehicles convert electrical energy into mechanical energy, which can greatly reduce environmental pollution compared to automobiles converting chemical energy into mechanical energy. Charging electric vehicles is very important to ensure the mileage of electric vehicles. Grounding detection is a necessary measure to protect the safety of users when using charging piles or on-board charging guns;

[0003] The current ground detection circuit still has the following technical problems when used:

[0004] The current ground detection circuit is relatively complex, the circuit is expensive to use, and long-term use will result in great expenses.

[0005] To this end, a grounding detection circuit for a new energy vehicle charging device is proposed to solve the above-mentioned problems. Utility Model Content

[0006] The purpose of the utility model is to provide a grounding detection circuit for a new energy vehicle charging device to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a grounding detection circuit of a new energy vehicle charging device, comprising an isolation module, wherein pin No. 1 of the isolation module is connected to a live wire input terminal and a neutral wire input terminal, pin No. 2 of the isolation module is connected to a PE input module, pin No. 3 of the isolation module is grounded, and pin No. 4 of the isolation module is connected to an isolated output signal circuit module.

[0008] Preferably, the isolation module is an isolation optocoupler, and the PE input module is PE.

[0009] Preferably, the live wire input end includes a resistor R1, a resistor R2 and a diode D1, the output end of the resistor R1 is connected to the resistor R2, the output end of the resistor R2 is connected to the diode D1, and the output end of the diode D1 is connected to pin 1 of the isolation optocoupler.

[0010] Preferably, the zero line input end includes a resistor R4, a resistor R5 and a diode D2, the output end of the resistor R4 is connected to the resistor R5, the output end of the resistor R5 is connected to the diode D2, and the output end of the diode D2 is connected to pin 1 of the isolation optocoupler.

[0011] Preferably, the isolated output signal circuit module includes a resistor R3 and a resistor R6, and the resistor R3 and the resistor R6 are connected to pin 4 of the isolation optocoupler. The output end of the resistor R6 is connected to an MCU control circuit, the MUC control circuit is PE-EEOR, and the resistor R3 is connected to the positive pole of the power supply.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The present application simplifies the ground fault detection circuit, which not only ensures the stability of product detection and increases the safety of the new energy vehicle charging device during use, but also reduces the cost of components, saves PCB space, and is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the schematic diagram of the detection circuit. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0017] Example:

[0018] See also Figure 1 , the utility model provides a technical solution:

[0019] A grounding detection circuit for a new energy vehicle charging device includes an isolation module, wherein pin 1 of the isolation module is connected to a live wire input terminal and a neutral wire input terminal, pin 2 of the isolation module is connected to a PE input module, pin 3 of the isolation module is grounded, and pin 4 of the isolation module is connected to an isolation output signal circuit module.

[0020] The isolation module uses an isolation optocoupler, and the PE input module is PE.

[0021] The live wire input end includes a resistor R1, a resistor R2 and a diode D1, the output end of the resistor R1 is connected to the resistor R2, the output end of the resistor R2 is connected to the diode D1, and the output end of the diode D1 is connected to pin 1 of the isolation optocoupler.

[0022] The zero line input end includes a resistor R4, a resistor R5 and a diode D2, the output end of the resistor R4 is connected to the resistor R5, the output end of the resistor R5 is connected to the diode D2, and the output end of the diode D2 is connected to pin 1 of the isolation optocoupler.

[0023] The isolated output signal circuit module includes a resistor R3 and a resistor R6, and the resistor R3 and the resistor R6 are connected to pin 4 of the isolation optocoupler. The output end of the resistor R6 is connected to an MCU control circuit, and the MUC control circuit is PE-EEOR. The resistor R3 is connected to the positive pole of the power supply.

[0024] Working principle:

[0025] When the live wire is connected to the circuit, the current is limited by resistors R1 and R2, and then rectified by diode D1 before entering the isolation optocoupler; when the neutral wire is connected to the circuit, the current is limited by resistors R4 and R5, and then rectified by diode D2 before entering the isolation optocoupler; due to the single-phase conduction characteristics of diodes D1 and D2, the live wire L and the neutral wire N do not form a loop, because the live wire and the neutral wire are connected to pin 1 of the isolation optocoupler through diodes D1 and D2, when the PE of pin 2 of the isolation optocoupler is grounded, the light-emitting diode inside the isolation optocoupler starts to work, and at this time, pins 3 and 4 of the optocoupler output end are turned on, and PE_EEOR is pulled down to a low level; if pin 2 of the isolation optocoupler PE is not grounded, pins 3 and 4 of the isolation optocoupler output end cannot be turned on, so that PE_EEOR outputs a high level, and combined with the MCU's judgment of the high and low levels of the PE_EEOR output, it can be judged whether the circuit grounding is normal.

[0026] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grounding detection circuit for a new energy vehicle charging device, comprising an isolation module, characterized in that: Pin No. 1 of the isolation module is connected with a live wire input terminal and a neutral wire input terminal, pin No. 2 of the isolation module is connected with a PE input module, pin No. 3 of the isolation module is grounded, and pin No. 4 of the isolation module is connected with an isolated output signal circuit module.

2. A grounding detection circuit for a new energy vehicle charging device according to claim 1, characterized in that: The isolation module uses an isolation optocoupler, and the PE input module is PE.

3. A grounding detection circuit for a new energy vehicle charging device according to claim 2, characterized in that: The live wire input end includes a resistor R1, a resistor R2 and a diode D1, the output end of the resistor R1 is connected to the resistor R2, the output end of the resistor R2 is connected to the diode D1, and the output end of the diode D1 is connected to pin 1 of the isolation optocoupler.

4. A grounding detection circuit for a new energy vehicle charging device according to claim 2, characterized in that: The zero line input end includes a resistor R4, a resistor R5 and a diode D2, the output end of the resistor R4 is connected to the resistor R5, the output end of the resistor R5 is connected to the diode D2, and the output end of the diode D2 is connected to pin 1 of the isolation optocoupler.

5. A grounding detection circuit for a new energy vehicle charging device according to claim 2, characterized in that: The isolated output signal circuit module includes a resistor R3 and a resistor R6, and the resistor R3 and the resistor R6 are connected to pin 4 of the isolation optocoupler. The output end of the resistor R6 is connected to an MCU control circuit, and the MCU control circuit is PE-EEOR. The resistor R3 is connected to the positive pole of the power supply.

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