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Grounding detection circuit and control system

A ground detection and detection circuit technology, applied in the field of charging piles, can solve the problems of poor safety and reliability, and achieve the effects of high safety and reliability, avoiding misjudgment or failure, and fast detection speed

Pending Publication Date: 2021-04-06
GUOCHUANG INNOVATION CENTER OF MOBILE ENERGY (JIANGSU) CO.,LTD.
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of poor safety and reliability of charging pile grounding detection in the prior art, the present invention provides a grounding detection circuit and control system with high safety, fast detection speed and high reliability

Method used

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  • Grounding detection circuit and control system
  • Grounding detection circuit and control system

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Embodiment 1

[0038] Such as Figure 1-2 As shown, the ground detection circuit of this embodiment includes a first voltage divider circuit and a first wave detection circuit. The first voltage divider circuit includes a capacitor CY1 and a capacitor C1 connected in series between the L line and the PE line. The first wave detection circuit is based on the capacitance The magnitude of the voltage across C1 outputs the first detection signal to the controller, specifically, as figure 2 As shown, the first end of the capacitor CY1 is electrically connected to the L line, that is, single-phase, the second end of the capacitor CY1 is connected to the first end of the capacitor C1, and the second end of the capacitor C1 is connected to the PE line, that is, the grounding line.

[0039] In this way, a capacitor voltage divider circuit is formed. Capacitor CY1 and capacitor C1 divide the voltage of single-phase electricity. The first detection circuit detects the voltage at both ends of capacitor...

Embodiment 2

[0051] The ground detection circuit of this embodiment includes a first ground detection circuit and a second ground detection circuit, wherein the first ground detection circuit is the ground detection circuit of Embodiment 1, and the circuit structure of the second ground detection circuit is basically the same as that of the first ground detection circuit. The circuit is the same, the difference is that the first ground detection circuit divides the voltage of the L line and the PE line through the capacitor, and outputs the ground signal JD1, and the second ground detection circuit uses the capacitor to divide the voltage of the N line and the PE line, and outputs the ground signal JD2. In this embodiment, two ground detection circuits are used for ground detection, and the ground signal JD1 and ground signal JD2 are respectively output to the controller. It can also judge whether the L line and the N line are reversed.

[0052] Specifically, such as image 3 As shown, th...

Embodiment 3

[0062] Such as Figure 5 As shown, this embodiment provides a control system. The control system of this embodiment includes the ground detection circuit of Embodiment 2, and also includes a power supply microprocessor and a host computer. The power supply microprocessor controls the power supply according to the shutdown signal output by the controller. The module is closed, and the host computer reminds the user that a ground fault occurs according to the warning signal sent by the controller.

[0063] After the controller judges that there is a ground fault or that the L line and the N line are reversed, the controller immediately cuts off the AC input relay and the DC output relay, and notifies the power supply microprocessor to turn off the power module of the charging pile through communication, and at the same time sends a warning message through the wireless network To the host computer to remind the user that a ground fault occurs or the L line and the N line are reve...

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Abstract

The invention relates to the technical field of charging piles, in particular to a grounding detection circuit and a control system, the grounding detection circuit comprises a first voltage division circuit and a first detection circuit, and the first voltage division circuit comprises a capacitor CY1 and a capacitor C1 which are connected in series between an L line and a PE line; and the first detection circuit outputs a first detection signal to the controller according to the voltages at the two ends of the capacitor C1. According to the grounding detection circuit provided by the invention, the grounding fault of the charging pile can be accurately and quickly judged in real time, the alternating current input and the direct current output are timely cut off, the insulation voltage resistance and safety requirements of the charging pile can be met, and the safety and the reliability are high.

Description

technical field [0001] The invention relates to the technical field of charging piles, in particular to a ground detection circuit and a control system. Background technique [0002] With the enhancement of people's awareness of environmental protection and the guidance of government policies, new energy electric vehicles have been widely developed. Charging piles are an important basic support for electric vehicles and one of the key conditions for the industrialization and popularization of electric vehicles. Accordingly, the safety and reliability of charging piles have also attracted much attention. As the charging pile works for a long time, the aging resistance of cable rubber and thermoplastic materials will often decrease, and even the insulation layer will peel off. AC input and output will damage electrical equipment and may endanger personal safety. [0003] In the prior art, some grounding detection schemes have the problem of not meeting safety regulations, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/52
CPCG01R31/52
Inventor 李晴晴裴玉兵杨志
Owner GUOCHUANG INNOVATION CENTER OF MOBILE ENERGY (JIANGSU) CO.,LTD.
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