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ZVS移相全桥变换器的优化设计与仿真
资料介绍
针对传统的零电压(ZVS)、零电压零电流(ZVZCS)移相全桥变换器的各种缺陷以及实际参数选取困难的问题,采用一种改进型零电压移相全桥软开关变换器,即在原边钳位两个超快恢复二极管与一隔直电容来降低副边电路的寄生震荡以防止变压器进入磁饱和,为进一步提高变换器的效率,副边采用全波整流。对所设计的电路进行细致的原理分析,给出若干关键值的优化计算过程,并以UC3875作为控制芯片,通过saber仿真验证理论分析的合理性,结果表明电路在实现软开关的同时也抑制了副边整流器件的电压应力,证明了所提优化方案的可靠性。
Aiming at the defects of traditional zero voltage(ZVS)and zero voltage zero current(ZVZCS)phase-shifted full- bridge converters,and difficulties in selecting actual parameters,an improved ZVS phase-shifted full-bridge soft-switching converter is used. In the primary side,two ultrafast recovery diodes and a DC blocking capacitor are clamped to reduce the parasitic oscillation of the secondary circuit and prevent the transformer from entering its magnetic saturation. In order to further improve the efficiency of the converter,full-wave rectification is adopted in the secondary side. A detailed principle analysis is performed for the designed circuit. The optimization calculation process of several key values is given. The rationality of the theoretical analysis is verified by Saber simulation by taking UC3875 as the control chip. The results show that the voltage stress of the secondary side rectifying device is suppressed while the soft switch is realized in this circuit,which proves the reliability of the proposed optimization scheme.
部分文件列表
| 文件名 | 大小 |
| ZVS移相全桥变换器的优化设计与仿真.pdf | 1M |
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