一种抑制副边寄生振荡的宽范围软开关全桥变换器  

A Soft Switching Full-bridge Converter With Reduced Secondary-side Parasitic Oscillation in a Wide Load Range

作　　者：陈仲[1] 刘沙沙[1] 史良辰[1] 

机构地区：[1]江苏省新能源发电与电能变换重点实验室(南京航空航天大学),江苏省南京市210016

出　　处：《中国电机工程学报》2013年第15期1-9,21,共9页Proceedings of the CSEE

基　　金：台达环境与教育基金会<电力电子科教发展计划>资助(DREG2012002);江苏省高校优势学科建设工程项目~~

摘　　要：提出一种抑制副边寄生振荡的新型零电压开关(zerovoltage switching,ZVS)脉宽调制(pulse width modulation,PWM)移相全桥变换器。引入辅助变压器作为换流电压源强制原边超前换流,副边寄生振荡抑制效果明显,不存在占空比的丢失;该变换器在较宽负载范围实现ZVS,原边在整个开关周期内不断向副边传递功率,不存在环流时间,输出滤波电感电流纹波得到大幅度削减。阐述该变换器的工作原理,给出关键特性的分析结果及参数设计原则,并通过一台480 W/48 V、开关频率为100 kHz的原理样机验证该变换器的优点。A zero voltage switching （ZVS） pulse width modulation （PWM） phase-shift full-bridge converter with reduced parasitic voltage oscillation is proposed. The introduced auxiliary transformer used as a voltage source forces the primary current commutating in advance, hence, parasitic voltage oscillation at secondary is well reduced and there is no duty cycle loss. ZVS of primary switches can be achieved in much wide load range, and the main transformer continuously transfers energy to load in a whole switching cycle, resulting in no circulating time, and the current ripple of output filter inductor decreases significantly. In this paper, the operation principle of the circuit is analyzed in detail. Besides, analysis of key characteristics and design considerations are also included. Finally, experimental results from a 480W/48V, 100 kHz prototypes are presented to confirm the advantages of the proposed converter.

关 键 词：寄生振荡 零电压开关 全桥变换器 软开关 

分 类 号：TM46[电气工程—电器]