DC charging pile insulation monitoring circuit and method

Abstract

The invention relates to a DC charging pile insulation monitoring circuit and method. The circuit comprises an initial positive bus voltage measurement module, an initial negative bus voltage measurement module, a standard positive bus voltage measurement module, a standard negative bus voltage measurement module and a micro-control module. The micro-control module is used for sending a positive initial voltage signal, a negative initial voltage signal, a positive standard voltage signal and a negative standard voltage signal to the initial positive bus voltage measurement module, the initialnegative bus voltage measurement module, the standard positive bus voltage measurement module and the standard negative bus voltage measurement module. Positive / negative insulation resistance values of the positive bus and the negative bus to the ground are calculated based on the received positive initial voltage signal, negative initial voltage signal, positive standard voltage signal and negative standard voltage signal, and when it is judged that the positive / negative insulation resistance values exceed the corresponding threshold values, an alarm signal is sent out, so that the working safety of the direct-current charging pile is improved.

Description

technical field [0001] The invention relates to the technical field of charging piles, in particular to a DC charging pile insulation monitoring circuit and method. Background technique [0002] At present, new energy electric vehicle technology is developing rapidly, and various new energy electric vehicles appear in people's daily life. As one of the key factors affecting the development of electric vehicle technology, the safety of DC charging piles has become a market concern. important focus. [0003] However, traditional DC charging piles generally use high-voltage output to improve charging efficiency, and the working environment is relatively harsh, such as vibration in the surrounding environment, acid and alkali gases, changes in temperature and humidity, which may cause damage to the cables of the DC charging pile. The rapid aging of the insulating material or even damage to the insulation will greatly reduce the insulation strength of the equipment and endanger ...

AI Technical Summary

Problems solved by technology

[0003] However, traditional DC charging piles generally use high-voltage output to improve charging efficiency, and the working environment is relatively harsh, such as vibration in the surrounding environment, acid and alkali gases, changes in temperature and humidity, which may cause damage to the cables of the DC charging pile. The insulation material is rapidly aging or even damaged, which greatly reduces the insulation strength of the equipment and endangers personal and property safety.

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