移相全桥ZVS变换器的分析和设计.pdf

20 10 1 1 25 2 7 6 T elecom Pow er Technology Nov. 2 5, 2010, Vol. 27 No. 6 : 100936 64(2 010) ZVS , (, 4500 01) : 移相全桥零电压开关变换器是中大功率直直变换场合的理想拓扑之 一, 但其次级整流二极管反向恢复时, 产 生严重的寄生振荡, 二极管上存在很高的尖峰电压而文献1 中的变换器通过增加 一个谐振电感和两 个二极管, 不仅可 以实现软开关, 还可以消除次级整流二极管反向恢复引起的电压振荡基于此变换器的工作原理, 文中设计了一台500 W 移相控制零电压软开关电源, 给出了主电路的设计过程和实验波形 : 移相全桥; 零电压;软开关 :T M46 1. 5 : A Analysis and Design of a ullBridge Converter with Phase Shift Control and ZeroVoltage Switching ZHANG Bengeng, LIU Ping ( Zhengzhou University, Zhengzhou 4 50 00 1, China) Abstract: The phaseshifted fullbridge zerovoltagesw itching PWM converter is w idely used in medium and high power levels.How ever, one problem existing in this kind of converter is the output rectif ier diodes suffer the parasitic oscil lation and voltage spike resulted by the reverse recovery of the rectifier diodes.T he converter discussed in the paper one can realizes ZVS and eliminates the voltage oscillat ion caused by the reverse recovery of the rectifier diodes by introducing one resonant and two clamping diodes. Based on the principle of the converter, a 500 W zerovoltageswitching ( ZVS ) soft sw itching power supply on the phase shift control is designed. The procedures of main circuit design are present ed. The ex perimental waveforms are given in t he end. Key words: phaseshifted; ZVS; softsw itching 0 1 , 1 , , 2 , , , , 1 , , , 2 , 1 5 6 D , D , D5 , D6 , 1 500 W , , :2 0100523 : 张