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.
出处
《电气应用》
北大核心
2008年第1期69-72,75,共5页
Electrotechnical Application
关键词
电力电子
DC—DC变换器
零电压零电流开关
无源钳位
power electronics DC - DC converter zero-voltage and zero-current switching（ZVZCS） passive clamping
