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低通态损耗的ZCS-PWM变换器族

, PP. 96-101

Keywords: 直流-直流变换器,脉宽调制,零电流开关,软开关,Buck变换器

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Abstract:

提出一种新型ZCS-PWM开关单元,并得到一族基于该开关单元的ZCS-PWM变换器。与传统的ZCS-PWM开关单元电路相比,新型ZCS-PWM开关单元不仅能在整个负载范围内实现所有开关管的零电流开关和所有二极管的零电压开关,而且主开关管的电流应力较低。此外,续流回路中仅有一个谐振电感和一个功率二极管,结构简单且具有较低的通态损耗。本文详细分析了基于该新型开关单元的Buck变换器的工作原理,并通过一台1000W、50kHz的原理样机验证了该零电流开关技术的可行性。

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