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适用于高压宽范围输入的交错串并联正激变换器

, PP. 45-51

Keywords: 直流变换器,正激变换器,拓扑,宽范围输入

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Abstract:

面向中高压-宽电压范围输入、高可靠性中大功率变换应用,提出一种交错串并联正激变换器。变换器由两个低压桥臂和一个高压桥臂构成,3个桥臂形成两个正激单元。其中,低压桥臂开关器件电压应力为输入电压的一半,高压桥臂的电压应力等于输入电压。该变换器继承了双管正激变换器可靠性高、电压应力低、效率高的优点,同时开关管的最大占空比可以达到0.67,是传统双管正激变换器最大占空比的1.33倍,因此可以适应高压、宽输入范围场合的应用;开关管占空比小于0.5时,高压桥臂开关管可以实现软开关,占空比大于0.5时,低压桥臂开关管可以实现软开关。详细分析变换器的工作原理及特性,实验结果验证了理论分析的正确性。

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