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Grounding detection circuit

A grounding detection and circuit technology, applied in the field of grounding, can solve the problems of imperfect grounding fault detection technical scheme, poor reliability and anti-interference, large leakage current, etc. Easy to use effect

Pending Publication Date: 2021-11-23
XIAMEN NEWYEA SCI & TECH
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Problems solved by technology

[0005] The present invention proposes a grounding detection circuit, which solves the imperfection of the existing charging pile grounding fault detection technical solution. The circuit of the existing grounding detection device is complicated, the cost is high, and the optocoupler is easy to be disconnected when the zero line and live line are used to withstand voltage. Problems such as burning out, large leakage current, poor reliability and anti-interference

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] In describing the present invention, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", " The orientation or positional relationship indicated by "right", "vertic...

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Abstract

Disclosed is a grounding detection circuit, comprising a current limiting module and a detection module which are sequentially connected in series. The current limiting module comprises a current limiting resistor, the detection module comprises a comparator and a first diode, the output end of the comparator is connected with the anode of the first diode, and the current limiting resistor is connected with the non-inverting input end U1A of the comparator and the inverting input end U1B of the comparator. The technical problems that an existing grounding detection device is complex in circuit, high in cost, prone to burning off an optocoupler electric appliance when withstand voltage is applied through a zero line and a live line, large in leakage current and the like are solved.

Description

technical field [0001] The invention relates to the technical field of grounding, and in particular to a grounding detection circuit. Background technique [0002] Charging piles are an important basic support for new energy electric vehicles and one of the key conditions for the industrialization and popularization of electric vehicles. Therefore, 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. If the grounding wire of the charging pile is suspended, the grounding fault cannot be detected and cut off in time. AC input and output will not only damage electrical equipment, but may also endanger personal safety. [0003] However, in the existing technology, some ground detection schemes have the problem of not meeting safety regulations, some ground detection schemes use ...

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Application Information

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IPC IPC(8): G01R31/52
CPCG01R31/52
Inventor 刘晓飞袁四昌林桂江
Owner XIAMEN NEWYEA SCI & TECH
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