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移相+PWM控制双Boost半桥双向DC-DC变换器软开关过程的分析

, PP. 17-25

Keywords: 相移+PWM,双向DC-DC,双Boost半桥,ZVS

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Abstract:

移相+PWM控制结合了移相控制和PWM控制的优点,可以减小变换器的电流应力和通态损耗,减小环流能量,提高变换器传输功率的能力,扩宽开关管零电压关断(ZVS)的范围。本文以移相+PWM控制双Boost半桥双向DC-DC变换器为研究对象,给出了变换器在各种工作模式下开关过程的等效电路模型,以及漏电感电流和结电容电压的表达式。分析了各开关管ZVS开通的条件,以及影响各开关管实现ZVS的非理想因素。最后给出了在特定功率软开关条件下的参数设计方法,通过仿真和实验证明了理论分析与参数设计方法的正确性。

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