基于互补占空比调制的改进全桥ZVS直流变换器  

Improved Full-bridge ZVS DC-DC Converter Based on Complementary Duty Cycle Modulation

作　　者：许章茁 潘健[1] XU Zhangzhuo;PAN Jian(School of Electrical and Electronic Engineering,Hubei University of Technology,Wuhan 430068,China)

机构地区：[1]湖北工业大学电气与电子工程学院,武汉430068

出　　处：《电源学报》2022年第6期117-126,共10页Journal of Power Supply

基　　金：太阳能高效利用及储能运行控制湖北省重点实验室开放基金资助项目(HBSEES201902)。

摘　　要：针对传统移相全桥零电压开关ZVS(zero voltage switching)变换器存在的例如软开关范围受限、占空比丢失以及寄生振荡问题,提出了一种基于互补占空比调制的改进全桥ZVS直流变换器。通过引入并联辅助谐振网络以实现滞后桥臂开关宽范围的ZVS,选择较小的谐振电感以减少占空比丢失,引入原边钳位二极管网络以消除寄生振荡。详细阐明了工作原理与特性分析,并进行了仿真对比。结果显示,在20%负载条件下,相较于传统移相全桥变换器,所提改进全桥变换器保证了软开关特性且消除了寄生振荡。Aimed at the problems in the traditional phase-shifted full-bridge(PSFB)zero voltage switching(ZVS)converters such as limited soft switching range,duty cycle loss and parasitic oscillation,an improved full-bridge ZVS DC-DC converter based on complementary duty cycle modulation is proposed in this paper.A wide ZVS range of the lagging leg switches is achieved through the introduction of a parallel auxiliary resonance network.The duty cycle loss is reduced by choosing a smaller resonant inductance,and the parasitic oscillation is eliminated by a clamping diode network on the primary side.The working principle and characteristic analysis are elaborated upon in detail,and a comparison is performed through simulations.Results show that compared with the traditional PSFB converter,the improved full-bridge converter proposed in this paper ensures the soft switching characteristics and eliminates the parasitic oscillation under the condition of 20%load.

关 键 词：全桥变换器 零电压开关 互补占空比 辅助谐振网络 钳位二极管 

分 类 号：TM46[电气工程—电器]