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无源无损软开关双降压式全桥逆变器

, PP. 40-48

Keywords: 无源无损,双降压式,软开关,开关损耗,可靠性,效率

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Abstract:

针对目前多数软开关逆变器拓扑结构都需要附加辅助开关器件来实现软开关技术,导致检测控制复杂这一问题,提出了一种新颖的无源无损软开关双降压式全桥逆变器。该电路在双降压全桥逆变器的基础上加入无源无损吸收电路,既保留了双降压全桥逆变器高效可靠的优点,同时利用双降压式全桥逆变器单向DC-DC的结构特点,通过增加无源无损吸收电路来实现软开关技术,利用无源器件自身的谐振过程改善功率器件的开关状况,减小开关管的关断损耗,同时使开关管导通期间无源无损吸收电路存储的能量得到有效转移。分析对比了七种拓扑结构的可靠度,表明无源无损软开关双降压式全桥逆变器具有较高的可靠性。实验表明了所提出的无源无损吸收电路有效地减小了开关损耗,提高了系统效率。

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