摘要
散热器与开关器件间寄生电容是共模电流流通的主要路径,形成的传导EMI对设备形成不良干扰。以充电机水冷散热器为例进行分析,对现有水冷散热器结构进行改造,将金属水箱分为两部分。通过仿真结果对比分析两种不同结构水冷散热器,证明采用所述方法能有效抑制传导共模电流。
Parasitic capacitance between the heat sink and switching devices is considered the main way for common mode （CM） current. Adverse interference is produced by the conducted EMI. Water cooling heat sink on charger was taken as an example to be analyzed. The structure of existing water cooling heat sink is altered, metal tank is divided into two parts, an insulating seal mounting groove connecting the two parts. One part linking to DC 0 V ground functions as electrostatic shielding and the other linking to ground by chassis. The parasitic capacitance between switching devices and heat sink linking to chassis ground is reduced and the effect of CM current is weakned. The effective CM current suppression of this method was confirmed by the simulation results of two different water cooling radiators.
出处
《电器与能效管理技术》
2016年第23期23-26,共4页
Electrical & Energy Management Technology
基金
国家电网公司项目(适应复杂环境的水冷电动汽车直流充电机关键技术研究)
国家自然科学基金重大国际合作项目(51320105002)
关键词
水冷散热器
寄生电容
共模电流
静电屏蔽
water cooling heat sink
parasitic capacitance
common mode current
electrostatic shielding
