摘要
在大功率Buck变换器中电路工作于高频开关状态 ,由于实际线路的寄生参数和器件的非理想特性的影响 ,开关器件两端会出现过高的电压和电流尖峰 ,严重地降低了电路的可靠性。本文详细分析了两种尖峰产生的原因和危害 ,有针对性地提出了几种RCL缓冲电路 ,并给出了电路各参数的分析和设计方法。仿真和使用结果证明了该缓冲电路具有良好的软开关效果 ,对于主开关管的电压尖峰和电流尖峰具有较强的抑制作用。
In high-power Buck converters, the circuit is in high switching mode. Since the distributed stray parameters of the lead and non-ideal performance of the devices, very high voltage and/or current spike appear on the switches, which reduced the reliability of the circuits. This paper analyzed the reasons of the two kinds of spike produced and their harm and proposed several RCL snubber circuits. The analysis and design methods of each parameter in the circuits are presented accordingly. The results of simulation and practical application prove that the snubber circuits have fine soft-switch effect and strong restraint function to the spikes.
出处
《电子器件》
CAS
2004年第2期257-260,共4页
Chinese Journal of Electron Devices
