一种无源无损吸收电路  

New passive lossless snubber circuit

作　　者：王连符[1] 冯培燕[1] 孙晓华[1] 

机构地区：[1]唐山职业技术学院机电工程系,河北唐山064002

出　　处：《电源技术》2013年第2期285-288,共4页Chinese Journal of Power Sources

基　　金：河北省自然科学基金资助项目(E2010001968)

摘　　要：变流器中的吸收电路能有效地抑制和吸收开关器件产生的尖峰电压和浪涌电流。改进L+RDC吸收电路拓扑结构,用电感器置换电阻,附加并联箝位二极管,可中止电容电压的谐波振荡。该结构能实现电容器储能的谐振馈能复位,避免因电阻发热引发的一系列故障,提高逆变器的效率和可靠性,改善功率器件的开关状态。吸收电路的参数不但影响吸收电路及开关器件的寿命,同时也影响最小脉宽的大小,是各种功率模块设计中的重要任务。基于吸收电路的换流过程,运用拉普拉斯变换分析,给出该种吸收电路参数的优化方法,并进行了仿真验证。最后给出新型吸收电路在Boost电路的应用结果。Snubber circuit can effectively restrain and absorb voltage peak and current surge. According to the design rule of the snubber circuit, a novel topology of snubber circuit was proposed in this paper, which had characters of high efficiency and high reliability. The optimal design of the snubber circuit is an important part of the design of power modules, which will highly impact on minimum pulse width and service life of switching devices. A novel design method of the snubber circuit was proposed in this paper after Laplasse transform analysis of an equivalent circuit. The simulation results verify the correctness and validity of the result. Finally, a voltage waveform of a Boost circuit with the new snubber circuit was presented.

关 键 词：吸收电路 拓扑 参数优化 谐波振荡 效率 最小脉宽 

分 类 号：TM46[电气工程—电器]