Insulation detection circuit and method for electric automobile

Abstract

The invention discloses an insulation detection circuit for an electric automobile. The insulation detection circuit comprises a battery and a detection module, a switch module, a multi-way selection switch module, an analog-digital conversion module and a main control module which are sequentially connected with the battery, and the main control module is connected with the switch module and the multi-way selection switch module separately. When the main control module controls the switch module to be in a first working state, first total voltage and first automobile body voltage are obtained by detecting the battery in the first working state, and when the main control module controls the switch module to be in a second working state, second total voltage and second automobile body voltage are obtained by detecting the battery in the second working state; the detection module transmits the first total voltage, the first automobile body voltage, the second total voltage and the second automobile body voltage to the analog-digital conversion module for analog-digital conversion, the data subjected to analog-digital conversion is transmitted to the main control module, and therefore the main control module can determine the insulation intensity of the electric automobile. The invention further discloses an insulation detection method of the electric automobile. According to the insulation detection circuit and method for the electric automobile, the complexity of a hardware circuit is reduced, and the reliability and convenience of insulation detection on the electric automobile are improved.

Description

technical field [0001] The invention relates to the technical field of automobile detection, in particular to an electric automobile insulation detection circuit and method. Background technique [0002] At present, the insulation detection of electric vehicles can be roughly divided into resistance method and signal injection method. For the signal injection method, because the signal needs to be injected, it is relatively cumbersome in terms of software processing, and it may affect the normal signal at the same time, and the reliability is low. For the resistance method, the commonly used method is: the whole system chooses the car body as the ground, so the hardware needs to be equipped with positive and negative power supplies, and at the same time, the signal needs to be reverse-processed. The hardware will be more complicated and not convenient enough. Contents of the invention [0003] The main purpose of the present invention is to provide an electric vehicle ins...

AI Technical Summary

Problems solved by technology

For the signal injection method, since the signal needs to be injected, it is cumbersome in terms of software processing, and it may affect the normal signal at the same time, and the reliability is low

For the resistance method, the commonly used method is: the whole system chooses the car body as the ground, so the hardware needs to be equipped with positive and negative power supplies, and at the same time, the signal needs to be reverse-processed. The hardware will be more complicated and not convenient enough.

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