Design of online detection system for insulation resistance of electric vehicle based on unbalanced bridge
SHEN Yongpeng
LIU Ankang
CUI Guangzhao
GE Gaorui
Abstract：Aiming at the problems of low accuracy, long detection time and poor reliability of existing insulation detection system for electric vehicles, on the basis of studying the inherent mechanism of the measurement accuracy and reliability of insulation resistance for electric vehicles, replacing traditional electric relay by resistance partial measurement and optical control relay, an insulation resistance detection circuit of unbalanced bridge based on high-precision instrument amplifier was designed, then a four-step on-line calculation method of insulation resistance was proposed. Finally, a number of insulation resistance tests were completed for a light truck. The results showed that the detection system could achieve 5％ insulation resistance measurement accuracy, and had the advantages of on-line detection and high reliability.
Keywords：electrical vehiclepower batteryinsulation detectionbridge circuit
Publication Date：2018-11-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 82-91 )