Detection circuit and method

Abstract

The embodiment of the invention relates to the field of circuit technology, and discloses a detection circuit and a method. The detection circuit includes a controller, a battery pack, a main positive switch module, a main negative switch module and at least one detection circuit. The voltage between the outside of the module and the outside of the main negative switch module. After closing any detection loop, collect the voltage of the positive pole and the negative pole of the battery pack and the voltage between the outside of the main positive switch module and the outside of the main negative switch module. Voltage, according to the insulation resistance of the main positive switch module and the inner side of the main negative switch module, as well as the voltage of the positive pole and the negative pole of the battery pack collected twice, and the voltage between the outside of the main positive switch module and the outside of the main negative switch module , to get the insulation resistance of the outer side. In the present invention, the insulation resistance on the outside of the main positive switch module and the main negative switch module can be detected.

Description

technical field [0001] The embodiments of the present invention relate to the field of circuit technology, and in particular to a detection circuit and method. Background technique [0002] With the development of battery technology, the replacement of fuel vehicles by electric vehicles has become the development trend of the automotive industry. The power battery pack is a key component of an electric vehicle. Both sides of the relay of the electric vehicle are grounded respectively. When the relay is closed, the insulation performance of the electric vehicle will be tested to ensure the safety of high-voltage electricity. [0003] The inventors have found that at least the following problems exist in the prior art: when detecting the insulation performance of electric vehicles, only the resistance value of the insulation resistance inside the relay can be detected, and the resistance value of the insulation resistance outside the relay cannot be detected; if the insulation...

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Problems solved by technology

[0003] The inventor has found that at least the following problems exist in the prior art: when detecting the insulation performance of electric vehicles, only the resistance value of the insulation resistance inside the relay can be detected, and the resistance value of the insulation resistance outside the relay cannot be detected; if the insulation resistance outside the relay Failure of the resistor can cause dangerous contact between the high voltage of the power battery pack and the ground

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