A charging pile on-site dielectric strength testing device

Abstract

The present invention relates to a charging pile on-site dielectric strength test device, comprising a receiver and a plurality of test points preset on the inner wall of a charging pile housing, wherein a transformer, a voltage regulating circuit and a first electrode are arranged on the test points; the breakdown voltage is tested by the test points preset on the inner wall of the charging pile housing and an external receiver; a transformer, a voltage regulating circuit and a first electrode are arranged in the test points, the transformer takes power from the inside of the charging pile, and after the voltage regulating circuit adjusts the set voltage value and discharges through the first electrode, the receiver receives a signal from the outside of the charging pile housing, and if the receiver can receive the signal, it indicates that the dielectric strength of the charging pile housing is attenuated, and the charging pile housing has a risk of leakage. The present invention can effectively perform a dielectric strength test on the charging pile at the charging pile installation site, thereby ensuring the safety of the charging pile during operation.

Description

Technical Field

[0001] The present invention relates to the technical field of charging pile testing, and in particular to an on-site dielectric strength testing device for a charging pile. 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 a specimen can withstand when it 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 electric shock when the charging pile is working, the dielectric strength of the charging pile is often measured. However, as the use time increases, the dielectric strength of the charging pile shell and handle will also change, so the dielectric strength of the charging pile needs to be tested regularly.

[0004] However, existing charging piles are generally sealed for waterproofing and electric shock prevention, making it very difficult to test the charging pile shell at a later stage. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a charging pile on-site dielectric strength testing device, which can facilitate the dielectric strength test of the charging pile shell at the charging pile installation site.

[0006] A charging pile on-site dielectric strength test device of the present invention comprises a receiver and a plurality of test points preset on the inner wall of the charging pile housing, wherein a transformer, a voltage regulating circuit and a first electrode are arranged on the test points, the primary winding of the transformer is connected to the power supply line inside the charging pile, the input end of the voltage regulating circuit is connected to the secondary winding of the transformer, the output end of the voltage regulating circuit is connected to the first electrode, and the first electrode is fitted and fixed to the corresponding position of the inner wall of the charging pile housing;

[0007] The receiver comprises a second electrode, an isolator, a sampling circuit, an operation controller and an output module. The second electrode is connected to the sampling circuit through the isolator, and the sampling circuit and the output module are connected to the operation controller.

[0008] Furthermore, a relay is provided on the connection line between the transformer and the power supply line inside the charging pile. The relay is connected in series to the connection line as a switch, and a control end of the relay is connected to a controller inside the charging pile through a switch tube.

[0009] Furthermore, the output module includes a display screen, a data interface and a communication transceiver.

[0010] Furthermore, the voltage regulating circuit is a chopper voltage regulating circuit, which includes four insulated gate bipolar transistors, a capacitor, an inductor and a resistor; the insulated gate bipolar transistors are connected in parallel in pairs and then connected in series to the power supply line; one group of parallel insulated gate bipolar transistors is connected in series with the inductor and then in parallel with the resistor and the capacitor; the two ends of the resistor are output ends and are connected to the first electrode.

[0011] Furthermore, the isolator is an optocoupler, the sampling circuit includes an operational amplifier and a trigger, the second electrode is connected to the positive or negative input terminal of the operational amplifier, the output terminal of the operational amplifier is connected to the trigger through the optocoupler, and the trigger outputs a signal to the operational controller.

[0012] The beneficial effects of the present invention are as follows: a device for testing the on-site dielectric strength of a charging pile of the present invention tests the breakdown voltage through a test point preset on the inner wall of the charging pile shell and an external receiver; a transformer, a voltage regulating circuit and a first electrode are arranged in the test point, the transformer takes power from the inside of the charging pile, and after the voltage regulating circuit adjusts the set voltage value and discharges through the first electrode, the receiver receives a signal from the outside of the charging pile shell, and if the receiver can receive the signal, it means that the dielectric strength of the charging pile shell is attenuated, and there is a risk of leakage in the charging pile shell. The present invention can effectively perform a dielectric strength test on the charging pile at the charging pile installation site, thereby ensuring the safety of the charging pile during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] 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:

[0014] FIG1 is a schematic diagram of the structure of the present invention;

[0015] FIG2 is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] When charging at high power, the connector of the charging pile is connected to the interface of the electric vehicle, and then the handshake protocol between the charging pile and the electric vehicle is passed, and the formal charging process begins. However, in the existing handshake protocol, there is no leakage detection of the charging pile, especially the plug and cable that are easily in contact with the user, which is prone to safety problems. Therefore, in this embodiment, a detection device is set to solve the above problem.

[0021] like Figure 1-Figure 2 As shown: A charging pile on-site dielectric strength test device of this embodiment includes a receiver and a plurality of test points preset on the inner wall of the charging pile shell. Taking a rectangular charging pile as an example, the test point array is distributed on the inner wall of the charging pile shell. As needed, the interval between adjacent test points is between 50-100CM.

[0022] The test point is provided with a transformer, a voltage regulating circuit and a first electrode; the transformer is a winding transformer, the primary winding of the transformer is connected to the power supply line inside the charging pile, and the power supply of the power supply line provides an AC signal. The input end of the voltage regulating circuit is connected to the secondary winding of the transformer, and the output end of the voltage regulating circuit is connected to the first electrode, and the first electrode is fixed to the corresponding position of the inner wall of the charging pile shell;

[0023] Specifically, the voltage regulating circuit is a chopper voltage regulating circuit, and the chopper voltage regulating circuit includes four insulated gate bipolar transistors (T1, T2, T3 and T4), a capacitor C, an inductor L and a resistor R; the insulated gate bipolar transistors are connected in parallel in pairs and then connected in series to the power supply line; one group of parallel insulated gate bipolar transistors is connected in series with the inductor and then connected in parallel with the resistor and the capacitor; the resistor is a resistive load, and the resistor R in this embodiment is the first electrode. When the voltage is an AC sinusoidal positive half-wave, T1 and T3 work, and T2 and T4 do not work. During the positive half-wave chopping, when T1 is turned on, the AC voltage is output to the load, and when T1 is turned off, T3 is turned on to play a freewheeling role, and the voltage input to the load is zero. The control signals of T1 and T3 are complementary, and the voltage on the load is controlled by the duty cycle of T1 conduction in each switching cycle.

[0024] The receiver comprises a second electrode, an isolator, a sampling circuit, an operation controller and an output module. The second electrode is connected to the sampling circuit through the isolator, and the sampling circuit and the output module are connected to the operation controller.

[0025] Specifically, the isolator is an optical coupler, the sampling circuit includes an operational amplifier and a trigger, the second electrode is connected to the positive or negative input terminal of the operational amplifier, the output terminal of the operational amplifier is connected to the trigger through the optical coupler, and the trigger outputs the signal to the operational controller. The operational controller is protected by the optical coupler, and the sampling signal is isolated by the optical coupler and then generated into a digital signal through the trigger and sent to the operational amplifier. When the electrical signal breaks through the shell, it can be sensed by the electrode and the circuit.

[0026] Specifically, in this embodiment, a relay is provided on the connection line between the transformer and the power supply line inside the charging pile. The relay is connected in series on the connection line as a switch, and the control end of the relay is connected to the controller inside the charging pile through a switch tube. The switch tube can be a MOS tube or a triode. The switch tube amplifies the signal to control the relay, and the power supply of the test point can be controlled through the relay. When the test is not required, the relay is in a normally closed state to avoid wasting electricity.

[0027] Specifically, in this embodiment, the output module includes a display screen, a data interface and a communication transceiver, and the detection result of whether the breakdown occurs is displayed on the display screen, output through the data interface or sent by the communication transceiver.

[0028] In summary, a device for testing the on-site dielectric strength of a charging pile of the present invention tests the breakdown voltage through a test point preset on the inner wall of the charging pile shell and an external receiver; a transformer, a voltage regulating circuit and a first electrode are arranged in the test point, the transformer takes power from the inside of the charging pile, and after the voltage regulating circuit adjusts the set voltage value and discharges through the first electrode, the receiver receives a signal from the outside of the charging pile shell. If the receiver can receive the signal, it means that the dielectric strength of the charging pile shell is attenuated, and there is a risk of leakage in the charging pile shell. The present invention can effectively perform a dielectric strength test on the charging pile at the charging pile installation site, thereby ensuring the safety of the charging pile during operation.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions 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 solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A charging pile on-site dielectric strength test device, characterized in that: It includes a receiver and a plurality of test points preset on the inner wall of the charging pile housing, on which a transformer, a voltage regulating circuit and a first electrode are arranged, the primary winding of the transformer is connected to the power supply line inside the charging pile, the input end of the voltage regulating circuit is connected to the secondary winding of the transformer, the output end of the voltage regulating circuit is connected to the first electrode, and the first electrode is fixedly attached to the corresponding position of the inner wall of the charging pile housing; The receiver comprises a second electrode, an isolator, a sampling circuit, an operation controller and an output module. The second electrode is connected to the sampling circuit through the isolator, and the sampling circuit and the output module are connected to the operation controller.

2. A charging pile on-site dielectric strength test device according to claim 1, characterized in that: A relay is provided on the connection line between the transformer and the power supply line inside the charging pile. The relay is connected in series to the connection line as a switch, and the control end of the relay is connected to the controller inside the charging pile through a switch tube.

3. The on-site dielectric strength test device for a charging pile according to claim 1, characterized in that: The output module includes a display screen, a data interface and a communication transceiver.

4. The on-site dielectric strength test device for a charging pile according to claim 1, characterized in that: The voltage regulation circuit is a chopper voltage regulation circuit, which includes four insulated gate bipolar transistors, a capacitor, an inductor and a resistor; the insulated gate bipolar transistors are connected in parallel in pairs and then connected in series to the power supply line; one group of parallel insulated gate bipolar transistors is connected in series with the inductor and then connected in parallel with the resistor and the capacitor; the two ends of the resistor are output ends and are connected to the first electrode.

5. The on-site dielectric strength test device for a charging pile according to claim 1, characterized in that: The isolator is an optocoupler, the sampling circuit includes an operational amplifier and a trigger, the second electrode is connected to the positive or negative input terminal of the operational amplifier, the output terminal of the operational amplifier is connected to the trigger through the optocoupler, and the trigger outputs a signal to the operational controller.

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