A dielectric strength testing device for an electric vehicle on-site charging interface

Abstract

The invention relates to a device for testing the dielectric strength of an on-site charging interface of an electric vehicle. A receiving part is preset in the charging interface of the electric vehicle, and then the charging interface is connected to charge through a simulated charger. A simulated charging gun in the simulated charger is specially set, and an electric signal is exported to the outer wall of the simulated charging gun through a metal strip to contact the insulating part of the charging interface. During simulated charging, the electrodes of the receiving part are used to receive the charge on the outer wall of the charging interface. If leakage occurs, the sampling circuit of the receiving part can collect the electric signal through the electrodes, and then send it to a data processor for analysis. The data processor directly sends the analysis result to a vehicle-mounted controller to obtain the test result. The device can simplify the dielectric strength measurement process of the charging interface of the electric vehicle, is conducive to testing the charging interface during use, can timely detect the leakage of the charging interface, and ensure the safety of users.

Description

Technical Field

[0001] The invention relates to the technical field of new energy vehicles, and in particular to a device for testing the dielectric strength of an electric vehicle on-site charging interface. Background Art

[0002] Dielectric strength is a measure of the electrical strength of a material as an insulator. It is defined as the maximum voltage per unit thickness that can be sustained when the specimen is punctured, expressed as volts per unit thickness. The greater the dielectric strength of a substance, the better it is as an insulator.

[0003] In order to avoid leakage when charging electric vehicles, the dielectric strength of the charging interface of electric vehicles is measured during production. However, as the charging interface is used for a longer time, its dielectric strength will also change, so it is necessary to conduct regular on-site testing of the dielectric strength of the charging interface.

[0004] However, since the charging port is sealed inside the car, existing measuring equipment is inconvenient to operate or even impossible to test the charging port. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a dielectric strength testing device for an on-site charging interface of an electric vehicle, which can facilitate on-site testing of the charging interface of an electric vehicle, thereby avoiding leakage of the charging interface during use.

[0006] The present invention provides a dielectric strength testing device for an on-site charging interface of an electric vehicle, comprising a receiving part and a charging simulator arranged inside the charging interface, wherein the charging simulator comprises a simulated charging gun and a power source, and the simulated charging gun is connected to the power source;

[0007] A circle of metal strips is provided on the outer wall of the plug of the simulated charging gun, and the metal strips are electrically connected to the power output terminal of the charging gun;

[0008] The receiving part includes multiple electrodes embedded in the outer wall of the charging interface and a data processor of the sampling circuit. The position of the electrodes corresponds to the position of the metal strip. The electrodes are connected to the input end of the sampling circuit, and the output end of the sampling circuit is connected to the data processor. An output module is provided on the data processor, and the data processor is connected to the control system of the electric vehicle through the output module.

[0009] Furthermore, the electrodes are evenly distributed along the charging interface; and the simulated charging gun is a DC charging gun or an AC charging gun.

[0010] Furthermore, the output module includes an RS232 interface, an RS485 interface, an RJ45 interface and a USB interface, and the output module is arranged on the side of the charging interface.

[0011] Further, the sampling circuit includes a first operational amplifier, an optical coupler and a second operational amplifier;

[0012] A non-inverting input terminal of the first operational amplifier is connected to the electrode, an inverting input terminal of the first operational amplifier is grounded, and an output terminal of the first operational amplifier is connected to an input terminal of the optical coupler;

[0013] The output end of the optical coupler is connected to the non-inverting input end of the second operational amplifier, and the output end of the second operational amplifier is connected to the data processor; a negative feedback line is set between the output end and the inverting input end of the second operational amplifier.

[0014] Furthermore, the power supply includes a DC source and an inverter, and the DC source directly outputs a DC signal or outputs an AC signal through the inverter.

[0015] The beneficial effects of the present invention are as follows: a dielectric strength testing device for an on-site charging interface of an electric vehicle of the present invention presets a receiving part in the charging interface of the electric vehicle, and then charges by connecting the charging interface through a simulated charger, a simulated charging gun in the simulated charger is specially set, and an electrical signal is exported to the outer wall of the simulated charging gun through a metal strip to contact the insulating part of the charging interface; during simulated charging, the electrodes of the receiving part are used to receive the charge on the outer wall of the charging interface, and if leakage occurs, the sampling circuit of the receiving part can collect the electrical signal through the electrodes, and then send it to the data processor for analysis; the data processor sends the analysis result directly to the on-board controller to obtain the test result; the present invention can simplify the dielectric strength measurement process of the charging interface of the electric vehicle, is conducive to testing the charging interface during use, can timely detect the leakage of the charging interface, and ensure the safety of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative work:

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the test circuit structure of the present invention;

[0019] The reference numerals are as follows: 1-charging port, 11-electrode, 2-simulated charging gun, 21-metal strip. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0022] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so 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, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0023] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0024] like Figure 1-Figure 2 As shown: a dielectric strength test device for an on-site charging interface 1 of an electric vehicle in this embodiment includes a receiving part and a charging simulator arranged inside the charging interface 1, the charging simulator includes a simulated charging gun 2 and a power source, and the simulated charging gun 2 is connected to the power source;

[0025] A circle of metal strip 21 is provided on the outer wall of the plug of the simulated charging gun 2, and the metal strip 21 is electrically connected to the power output terminal of the charging gun;

[0026] The receiving part includes a plurality of electrodes 11 embedded in the outer wall of the charging interface 1 and a data processor of the sampling circuit. The position of the electrode 11 corresponds to the position of the metal strip 21. The electrode 11 is connected to the input end of the sampling circuit, and the output end of the sampling circuit is connected to the data processor. An output module is provided on the data processor, and the data processor is connected to the control system of the electric vehicle through the output module.

[0027] The present invention discloses a device for testing the dielectric strength of an on-site charging interface 1 of an electric vehicle. The device presets a receiving part in the charging interface 1 of the electric vehicle, and then charges by connecting the charging interface 1 to a simulated charger. The simulated charging gun 2 in the simulated charger is specially configured, and an electrical signal is exported to the outer wall of the simulated charging gun 2 and contacts the insulating part of the charging interface 1 through a metal strip 21. During simulated charging, the electrode 11 of the receiving part is used to receive the charge on the outer wall of the charging interface 1. If leakage occurs, the sampling circuit of the receiving part can collect the electrical signal through the electrode 11, and then send it to a data processor for analysis. The data processor directly sends the analysis result to the on-board controller to obtain the test result. The present invention can simplify the dielectric strength measurement process of the charging interface 1 of the electric vehicle, is conducive to testing the charging interface 1 during use, and can timely detect the leakage of the charging interface 1 to ensure the safety of the user.

[0028] Specifically, in this embodiment, the electrodes 11 are evenly distributed along the charging interface 1 ; the simulated charging gun 2 is a DC charging gun or an AC charging gun.

[0029] The terminals inside the DC charging gun include a DC positive terminal DC+, a DC negative terminal DC-, a ground terminal PE, a first connection confirmation terminal CC1, a second connection confirmation terminal CC2, a low-voltage auxiliary power supply positive terminal A+, a low-voltage auxiliary power supply negative terminal A-, a first communication terminal CAN-H, and a second communication terminal CAN-L; the terminals responsible for charging are mainly the DC positive terminal DC+ and the DC negative terminal DC-; therefore, the metal strip 21 inside the charging gun is in contact with the DC positive terminal DC+ and the DC negative terminal DC-;

[0030] If the charging gun is an AC charging gun, the internal terminals include an AC power terminal L, a first standby terminal NC1, a second standby terminal NC2, a neutral terminal N, a ground terminal PE, a charging confirmation terminal CC, and a control confirmation terminal CP; therefore, the metal strip 21 in the charging gun contacts the AC power terminal L and the neutral terminal N;

[0031] Specifically in this embodiment, the output module includes an RS232 interface, an RS485 interface, an RJ45 interface and a USB interface, and the output module is arranged on the side of the charging interface 1; the controller inside the electric vehicle is directly connected to the data processor through wiring to realize data interaction; the RS232 interface, RS485 interface, RJ45 interface and USB interface are for exporting test data to an external device for viewing during testing.

[0032] Specifically in this embodiment, the sampling circuit includes a first operational amplifier, an optical coupler, and a second operational amplifier;

[0033] A non-inverting input terminal of the first operational amplifier is connected to the electrode 11, an inverting input terminal of the first operational amplifier is grounded, and an output terminal of the first operational amplifier is connected to an input terminal of the optical coupler;

[0034] The output end of the optical coupler is connected to the non-inverting input end of the second operational amplifier, and the output end of the second operational amplifier is connected to the data processor; a negative feedback line is set between the output end and the inverting input end of the second operational amplifier.

[0035] The sampling circuit collects data through two operational amplifiers and an optocoupler, which is used to isolate and protect the data processor.

[0036] Specifically, in this embodiment, the power supply includes a DC source and an inverter. The DC source directly outputs a DC signal or outputs an AC signal through an inverter. The DC signal and the AC signal can be switched according to the type of the charging interface 1 and the charging gun.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A dielectric strength test device for an electric vehicle on-site charging interface, characterized in that: It includes setting a receiving part and a charging simulator inside the charging interface, the charging simulator includes a simulated charging gun and a power supply, and the simulated charging gun is connected to the power supply; A circle of metal strips is provided on the outer wall of the plug of the simulated charging gun, and the metal strips are electrically connected to the power output terminal of the charging gun; The receiving part includes multiple electrodes embedded in the outer wall of the charging interface and a data processor of the sampling circuit. The position of the electrodes corresponds to the position of the metal strip. The electrodes are connected to the input end of the sampling circuit, and the output end of the sampling circuit is connected to the data processor. An output module is provided on the data processor, and the data processor is connected to the control system of the electric vehicle through the output module.

2. The device for testing the dielectric strength of an electric vehicle on-site charging interface according to claim 1, characterized in that: The electrodes are evenly distributed along the charging interface; the simulated charging gun is a DC charging gun or an AC charging gun.

3. The dielectric strength testing device for an electric vehicle on-site charging interface according to claim 1, characterized in that: The output module includes an RS232 interface, an RS485 interface, an RJ45 interface and a USB interface, and the output module is arranged on the side of the charging interface.

4. The device for testing the dielectric strength of an electric vehicle on-site charging interface according to claim 1, characterized in that: The sampling circuit includes a first operational amplifier, an optical coupler, and a second operational amplifier; A non-inverting input terminal of the first operational amplifier is connected to the electrode, an inverting input terminal of the first operational amplifier is grounded, and an output terminal of the first operational amplifier is connected to an input terminal of the optical coupler; The output end of the optical coupler is connected to the non-inverting input end of the second operational amplifier, and the output end of the second operational amplifier is connected to the data processor; a negative feedback line is set between the output end and the inverting input end of the second operational amplifier.

5. The device for testing the dielectric strength of an electric vehicle on-site charging interface according to claim 1, characterized in that: The power supply includes a DC source and an inverter. The DC source directly outputs a DC signal or outputs an AC signal through the inverter.

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