Heat Dissipation and Ripple Current Rating in Electrolytic Capacitors

[摘要] The ripple current rating in electrolytic capacitors is limited by the maximum allowable temperature rise inside thecapacitor. The temperature rise is determined by the I2R losses inside the capacitor and the efficiency of heat flowfrom the interior to the surrounding. The ripple current rating can be extended by either reducing the tanδof thecapacitor or by increasing the efficiency of heat flow to ambient.The heat flow is determined by the thermal characteristics of the capacitor surface and thermal conductivity ofthe medium separating the capacitor winding from the surrounding.In this article a mathematical analysis for the heat flow in capacitors is given. The effects of various parametersare examined and methods of extending the ripple current rating are discussed.

[学科分类] 工程和技术（综合）