Charging pile grounding detection device

Abstract

The utility model belongs to the technical field of electrical detection, and provides a charging pile grounding detection device which comprises a control unit, a solid-state relay, a power supply, a leakage current detection unit and an amplification unit. The solid-state relay is respectively connected with the control unit and the charging pile and is used for outputting leakage current to a grounding end; the power supply is connected with the solid-state relay; the leakage current detection unit is respectively connected with the solid-state relay and the grounding end and is used for acquiring a current signal of the grounding end; the amplification unit is connected with the control unit and the leakage current detection unit. The device is simple in structure, can quickly detect whether the grounding end of the charging pile is normal or not, and is high in detection accuracy.

Description

Technical Field

[0001] This application belongs to the technical field of electrical detection, and more specifically, relates to a grounding detection device for charging piles. Background Art

[0002] To meet the charging needs of new energy vehicles, the application of charging piles is increasing day by day. Therefore, the circuit design of charging piles has a non-negligible impact on the safe and normal operation of the system, especially the design of the grounding detection scheme for charging piles.

[0003] Existing grounding detection circuits generally judge whether the charging pile is grounded normally by optocoupler detection or by the voltage between the phase line and the ground. However, the optocoupler transmission ratio range in optocoupler detection is relatively large, and the transmission ratio is easily affected by temperature, which is prone to false alarms of grounding faults. Moreover, when there is leakage at the vehicle end during charging, when the ground wire is disconnected, the working state of the optocoupler remains unchanged, and the grounding fault cannot be detected. Judging whether the charging pile is grounded normally by the voltage between the phase line and the ground is easily affected by the Y capacitors of the charging pile and the vehicle, resulting in false alarms. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings in the prior art, the purpose of this application is to provide a grounding detection device for charging piles, which has a simple structure, can quickly detect whether the grounding end of the charging pile is normal, and has a high detection accuracy.

[0005] The technical means adopted by this application to solve the above technical problems is:

[0006] This application provides a grounding detection device for a charging pile with a grounding end, which is characterized by including:

[0007] A control unit;

[0008] A solid-state relay, which is respectively connected to the control unit and the charging pile, and is used to output a leakage current to the grounding end;

[0009] A power supply, which is connected to the solid-state relay;

[0010] A leakage current detection unit, which is respectively connected to the solid-state relay and the grounding end, and is used to collect the current signal of the grounding end;

[0011] An amplification unit, which is respectively connected to the control unit and the leakage current detection unit.

[0012] Preferably, the leakage current detection unit is a Hall sensor.

[0013] Preferably, the leakage current output by the solid-state relay is 3 - 5 mA.

[0014] Preferably, the amplification unit is a non-inverting or inverting amplifier circuit.

[0015] Preferably, the control unit is a microcontroller unit.

[0016] Compared with the prior art, the grounding detection device of the charging pile in this application is provided with a solid-state relay. The control unit controls the solid-state relay to output a leakage current to the grounding end of the charging pile. The leakage current detection unit collects the current signal passing through the grounding end. After being amplified by the amplification unit, the current signal is input into the control unit. The control unit determines whether the grounding end is normal according to the magnitude of the current signal, with accurate detection and a simple and fast structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of this application, the following will briefly introduce the drawings required to be used in the embodiments of this application. It should be understood that the following drawings only show some embodiments of this application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the grounding detection device of the charging pile of this application.

[0019] MARKING DESCRIPTION:

[0020] 1. Control unit; 2. Solid-state relay; 3. Power supply; 4. Leakage current detection unit; 5. Amplification unit; 6. Charging pile. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to be able to more clearly understand the above-mentioned objects, features, and advantages of the present invention, the present invention will be described in detail below in conjunction with the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of this application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0022] It should be noted that: Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this utility model belongs. The terms used in the specification of this utility model herein are only for the purpose of describing specific embodiments and are not intended to limit this utility model. Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0023] As Figure 1 shown, in this embodiment, a grounding detection device for a charging pile 6 is provided, including a control unit 1, a solid-state relay 2, a power supply 3, a leakage current detection unit 4, and an amplification unit 5; the solid-state relay 2 is respectively connected to the control unit 1 and the charging pile 6 for outputting a leakage current to the grounding end; the power supply 3 is connected to the solid-state relay 2; the leakage current detection unit 4 is respectively connected to the solid-state relay 2 and the grounding end for collecting the current signal at the grounding end; the amplification unit 5 is respectively connected to the control unit 1 and the leakage current detection unit 4.

[0024] It should be noted that the current signal output by the amplification unit 5 is input to the ADC port of the control unit 1. After the ADC port of the control unit 1 receives the current signal, how to detect the current magnitude is the prior art and is not the protected content of this application, so it will not be elaborated here.

[0025] In some preferred embodiments of this utility model, the leakage current detection unit 4 is a Hall sensor. In this way, the Hall sensor detection is more accurate.

[0026] In some preferred embodiments of this utility model, the leakage current output by the solid-state relay 2 is 3 - 5 mA.

[0027] In some preferred embodiments of this utility model, the amplification unit 5 is a non-inverting or inverting amplifier circuit.

[0028] In some preferred embodiments of this utility model, the control unit 1 is a micro-control unit 1.

[0029] Compared with the prior art, the grounding detection device for the charging pile 6 of this application is provided with a solid-state relay 2. The control unit 1 controls the solid-state relay 2 to output a leakage current to the grounding end of the charging pile 6. The leakage current detection unit 4 collects the current signal passing through the grounding end. The current signal is amplified by the amplification unit 5 and then input to the control unit 1. The control unit 1 determines whether the grounding end is normal according to the magnitude of the current signal, with accurate detection and a simple and fast structure.

[0030] As described above, this is only the specific implementation manner of the present application and is not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or replacements, which should also be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

[0031] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

Claims

1. A charging pile grounding detection device, used for a charging pile with a grounding terminal, characterized in that: include: Control unit; A solid-state relay, the solid-state relay is connected to the control unit and the charging pile respectively, and is used to output leakage current to the ground terminal; a power supply connected to the solid-state relay; A leakage current detection unit, the leakage current detection unit is connected to the solid-state relay and the ground terminal respectively, and is used to collect a current signal of the ground terminal; an amplifying unit, wherein the amplifying unit is connected to the control unit and the leakage current detecting unit respectively.

2. The charging pile grounding detection device according to claim 1, characterized in that: The leakage current detection unit is a Hall sensor.

3. The charging pile grounding detection device according to claim 1, characterized in that: The leakage current output by the solid-state relay is 3-5 mA.

4. The charging pile grounding detection device according to claim 1, characterized in that: The amplifying unit is a same-direction or reverse-direction amplifying circuit.

5. The charging pile grounding detection device according to claim 1, characterized in that: The control unit is a micro control unit.

Images