Title :
Active-clamp DC/DC converters using magnetic switches
Author :
Zhao, Qun ; Tao, Fengfeng ; Hu, Yongxuan ; Lee, Fred C.
Author_Institution :
Bradley Dept. of Electr. & Comput. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
Although DC/DC power converters with coupled inductors can provide high voltage gain to meet the requirements of many emerging applications, their efficiency is degraded by losses associated with the leakage inductors. The active-clamp technique recycles the leakage energy, but at the price of increasing topology complexity. A family of high-efficiency, high step-up DC/DC power converters is proposed in this paper. The proposed converters, which use diodes and coupled windings instead of active switches to realize clamp functions, present better performance than their active-clamp counterparts. The efficiency of a 35 W front-end converter for a high intensity discharge lamp ballast is higher than 90% with 12 V input and 100 V output. The high efficiency is achieved because the leakage energy is recycled and the switch voltage stress is minimized
Keywords :
DC-DC power convertors; active networks; magnetic leakage; magnetic switching; power inductors; switching circuits; windings; 100 V; 12 V; 35 W; 90 percent; active-clamp DC/DC power converters; clamp functions; coupled windings; front-end converter; high intensity discharge lamp ballast; leakage energy recycling; leakage inductors; magnetic switches; performance; step-up DC/DC power conversion; switch voltage stress minimisation; voltage gain; Clamps; DC-DC power converters; Degradation; Diodes; Inductors; Magnetic switching; Switches; Switching converters; Topology; Voltage;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2001. APEC 2001. Sixteenth Annual IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
0-7803-6618-2
DOI :
10.1109/APEC.2001.912481