Electric vehicle insulation detecting circuit

Abstract

The invention discloses an electric vehicle insulation detecting circuit. By means of the characteristic that flexibility of a balanced bridge is high, by detecting electricity supply through an external low-voltage alternating power supply, on the premise that the whole vehicle system is not influenced, the insulation resistance value is accurately measured, operation and calculation are easy, and the insulativity of the electric vehicle is monitored in real time.

Description

technical field [0001] The invention relates to an insulation detection circuit, in particular to an electric vehicle insulation detection circuit. technical background [0002] Electric vehicles use batteries as energy to drive motors to achieve the purpose of driving electric vehicles. Commonly used electric vehicle drive power supply voltages are above 36V, and some are as high as 500V, far exceeding the level of safe voltage. Therefore, the power system of electric vehicles requires It has very reliable insulation to ensure the normal operation of electric vehicles and the safety of users. Good insulation can ensure the safe operation of electrical equipment and circuits. Insulation resistance is the most basic insulation index for electrical equipment and electrical circuits. [0003] Therefore, in order to be able to detect the insulation resistance value of the electric vehicle in real time and monitor the insulation of the electric vehicle, there are currently the f...

AI Technical Summary

Problems solved by technology

[0004] 1. The switch needs to be disconnected and closed many times, and the operation is complicated;

[0005] 2. As the vehicle drives, the power supply voltage will change, which will affect the test results;

[0006] 3. The voltage division of the test resistor affects the driving voltage of the vehicle system;

[0007] 4. Complicated calculation

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