不平衡电桥电动汽车绝缘电阻在线检测系统设计
Design of online detection system for insulation resistance of electric vehicle based on unbalanced bridge
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摘要: 针对现有电动汽车绝缘检测系统精度低、检测时间长、可靠性差等问题,用电阻分压测量、光控继电器替代传统继电器,设计了一种基于高精度仪表放大器的不平衡电桥绝缘电阻在线检测电路,并提出了四步骤绝缘电阻在线计算方法.运用本检测系统对某轻型货车进行多组绝缘电阻测试实验,结果表明,该系统能够将绝缘电阻测量精度控制在误差5%以下,同时还具有可在线检测、可靠性高等优点.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.
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Key words:
- electrical vehicle /
- power battery /
- insulation detection /
- bridge circuit
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