PEN protection coexistence circuit of AC charging pile

Abstract

The utility model provides a PEN protection coexistence circuit of an alternating current charging pile, an input end N line and a PE line of the alternating current charging pile share to form a PEN end, and the PEN end is connected to an output end of the alternating current charging pile through the PE line; the PE line is connected in series with a magnetic latching relay; the charging pile further comprises a detection circuit, and the detection circuit detects the change of current flowing through the PEN end and the voltage difference between the charging pile shell and the ground and sends a detection value to the controller. The PEN protection coexistence circuit of the alternating current charging pile can meet the requirement of PEN protection and is low in cost.

Description

TECHNICAL FIELD

[0001] The present application relates to charging piles, in particular to a PEN protection coexistence circuit of an alternating current charging pile. BACKGROUND

[0002] A conventional alternating current charging pile has a normally open relay connected in series at the input end and the output end of PE, as shown in the following figure. Figure 1 Most ordinary relays are tested and the impedance cannot meet the requirement of less than 100 mΩ, or a relatively large size and a relatively large current passing through the relay is used to meet the requirement, and the price is relatively high. Therefore, in order to meet the British standard, a PEN protection coexistence circuit with relatively low cost is needed. SUMMARY

[0003] The present application solves the main technical problem of providing a PEN protection coexistence circuit of an alternating current charging pile, which can meet the requirement of PEN protection and has relatively low cost.

[0004] In order to solve the above technical problems, the present application provides a PEN protection coexistence circuit of an alternating current charging pile, the input end N line and the PE line of the alternating current charging pile are shared to form a PEN end, the PEN end is connected to the output end of the alternating current charging pile through the PE line; a magnetic latching relay is connected in series on the PE line, and the impedance of the magnetic latching relay is less than or equal to 100 mΩ.

[0005] Further comprising a detection circuit, the detection circuit detects the current change flowing through the PEN end and the voltage difference between the charging pile shell and the ground, and sends the detection value to the controller;

[0006] The controller judges whether the current flowing through the PEN end exceeds the maximum current threshold or is lower than the minimum current threshold, if yes, it is judged that the current is abnormal, and further judges whether the duration of the current abnormality exceeds the first set threshold, if yes, it is judged that the PEN end is disconnected or faulty;

[0007] The controller judges whether the voltage difference between the charging pile shell and the ground exceeds the maximum voltage threshold, if yes, it is judged that the voltage is abnormal, and further judges whether the duration of the voltage abnormality exceeds the second set threshold, if yes, it is judged that the PEN end is disconnected or has poor contact.

[0008] In a preferred embodiment, the model of the magnetic latching relay is Hongfa HF163F-L16.

[0009] In a preferred embodiment, the input end L1 end of the PEN end and the alternating current charging pile leads the zero line and the live line to the magnetic latching relay.

[0010] In a preferred embodiment: the live wire and the zero wire are connected to the power module to generate 12V power supply for the detection circuit and the controller.

[0011] In a preferred embodiment: the live wire and the zero wire are connected to the voltage detection module, the zero-crossing detection module, the leakage detection module respectively, and the current detection module is also connected to the zero wire; the output terminals of the voltage detection module, the zero-crossing detection module, the leakage detection module and the current detection module are connected to the signal input terminals of the detection circuit; the signal input terminals of the detection circuit are also connected to the temperature detection module.

[0012] In a preferred embodiment: the voltage detection module is connected between the PE wire and the zero wire, and the output terminal of the voltage detection module is connected to the signal input terminal of the detection circuit.

[0013] In a preferred embodiment: the signal output terminals of the detection circuit are connected to the magnetic latching relay and the controller.

[0014] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0015] The present application realizes the protection requirements of PEN and PE, and meets the market requirements of small size and low price through the voltage detection module, the current detection module, the magnetic latching relay and the corresponding algorithm control. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the prior art;

[0017] Figure 2 is a schematic diagram of the preferred embodiment of the present application;

[0018] Figure 3 is a schematic diagram of the control method in the preferred embodiment of the present application. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments of the present application; based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be broadly understood, for example, "connected" can be wall-mounted connection, can also be detachable connection, or integral connection, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements, and for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] Reference Figure 2 And Figure 3 The embodiment provides a PEN protection coexistence circuit of an alternating current charging pile. An input end N line and a PE line of the alternating current charging pile are shared to form a PEN end. The PEN end is connected to an output end of the alternating current charging pile through the PE line. A magnetic latching relay is connected in series on the PE line. The impedance of the magnetic latching relay is less than or equal to 100 m omega.

[0023] And, further comprising a detection circuit, the detection circuit detects the current change flowing through the PEN end and the voltage difference between the charging pile shell and the ground, and sends the detection value to the controller;

[0024] The controller judges whether the current flowing through the PEN end exceeds the maximum current threshold or is lower than the minimum current threshold. If yes, it is judged that the current is abnormal, and further judges whether the duration of the current abnormality exceeds the first set threshold. If yes, it is judged that the PEN end is disconnected or faulty.

[0025] The controller judges whether the voltage difference between the charging pile shell and the ground exceeds the maximum voltage threshold. If yes, it is judged that the voltage is abnormal, and further judges whether the duration of the voltage abnormality exceeds the second set threshold. If yes, it is judged that the PEN end is disconnected or has poor contact.

[0026] In order to realize that the impedance is less than or equal to 100 m omega, the embodiment compares some normally open relays and magnetic latching relays, as shown in the following table:

[0027]

[0028]

[0029] After comparison, the magnetic latching relay HF163F-L16 of Haofa is selected in the embodiment, which meets the advantages of low contact impedance, small size and low unit price.

[0030] Specifically, in the circuit of the embodiment, the PEN end and the input end L1 end of the alternating current charging pile are connected to the magnetic latching relay through the zero line and the live wire. The live wire and the zero line are connected to the power module to generate 12V power supply for the detection circuit and the controller. The live wire and the zero line are respectively connected to the voltage detection module, the zero-crossing detection module and the leakage detection module, and the current detection module is further connected to the zero line; the output ends of the voltage detection module, the zero-crossing detection module, the leakage detection module and the current detection module are connected to the signal input end of the detection circuit; the signal input end of the detection circuit is further connected to the temperature detection module. The voltage detection module is connected between the PE line and the zero line, and the output end of the voltage detection module is connected to the signal input end of the detection circuit. The signal output end of the detection circuit is connected to the magnetic latching relay.

[0031] The above is only the preferred specific embodiment of the present application, but the design concept of the present application is not limited to this. Any skilled person in the art can make non-substantial changes to the present application within the technical range disclosed by the present application, which is an infringement of the protection scope of the present application.

Claims

1. A PEN protection coexistence circuit for an alternating current charging post, characterized in that: The input end N line and the PE line of the alternating current charging pile share a PEN end, the PEN end is connected to the output end of the alternating current charging pile through the PE line, a magnetic latching relay is connected in series on the PE line, and impedance of the magnetic latching relay is less than or equal to 100 mΩ. Further comprising a detection circuit, the detection circuit detects current change flowing through the PEN end and voltage difference between the charging pile shell and the ground, and sends the detection value to the controller.

2. The PEN protection coexistence circuit of an alternating current charging pile according to claim 1, characterized in that: The model of the magnetic latching relay is Macro HF163F-L16.

3. The PEN protection coexistence circuit of an alternating current charging pile according to claim 1, wherein: The PEN end and the input end L1 end of the alternating current charging pile lead out the zero line and the live line to the magnetic latching relay.

4. The PEN protection coexistence circuit of an alternating current charging pile according to claim 3, characterized in that: The live line and the zero line are connected to the power module to generate 12V power supply to power the detection circuit and the controller.

5. The PEN protection coexistence circuit of an alternating current charging pile according to claim 4, characterized in that: The live line and the zero line are respectively connected to a voltage detection module, a zero-crossing detection module and a leakage detection module, and a current detection module is further connected on the zero line; the output end of the voltage detection module, the zero-crossing detection module, the leakage detection module and the current detection module is connected to the signal input end of the detection circuit; the signal input end of the detection circuit is further connected to a temperature detection module.

6. The PEN protection coexistence circuit of an alternating current charging pile according to claim 4, characterized in that: The voltage detection module is connected between the PE line and the zero line, and the output end of the voltage detection module is connected to the signal input end of the detection circuit.

7. The PEN protection coexistence circuit of an alternating current charging pile according to claim 4, characterized in that: The signal output end of the detection circuit is connected to the magnetic latching relay and the controller.

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