基于UC3875控制的移相全桥PWM DC-DC变换器  

Phase-Shifted Full-Bridge PWM DC-DC Converter Based on UC3875 Control

作　　者：刘星桥[1] 陈光菊[1] 王斌[1] 

机构地区：[1]江苏大学电气工程系,212013

出　　处：《电气应用》2008年第1期69-72,75,共5页Electrotechnical Application

摘　　要：针对传统的全桥移相式零电压零电流开关(FB-PS-ZVZCS)PWMDC-DC变换器在实现滞后桥臂开关管零电流开关(ZCS)的过程中,存在着辅助谐振电路附加损耗较大、软开关实现方式复杂以及功率开关管电压和电流应力高等缺点,提出了一种通过辅助无源钳位网络来实现软开关的全桥ZVZCS PWM DC-DC变换器。采用UC3875作为控制芯片,设计了变换器控制系统。通过一台1kW,25kHz的样机验证了这种软开关变换器相关理论的正确性。Conventional full-bridge zero-voltage and zero-currentswitching （ZVZCS） PW M DC - DC converters exist some disadvantages in the operating process of ZCS for lagging leg. These problems include additional losses in auxiliary circuit, complicated realization for soft-switching,and high voltage and current stresses of switches. A full-bridge ZVZCS PWM DC - DC converter with aux- iliary passive clamping net is proposed to resolve these issues. The soft-switching operating principle of the converter is analyzed, and control system is designed using UC3875 chip. A lkW, 50kHz prototype has verified the principle and characteristics of the proposed soft-switching converter.

关 键 词：电力电子 DC—DC变换器 零电压零电流开关 无源钳位 

分 类 号：TM46[电气工程—电器]