Title :
A Passive Lossless Snubber Cell With Minimum Stress and Wide Soft-Switching Range
Author :
Li, River T H ; Chung, Henry Shu-Hung
Author_Institution :
Centre for Power Electron., City Univ. of Hong Kong, Kowloon, China
fDate :
7/1/2010 12:00:00 AM
Abstract :
A passive lossless snubber cell and its dual structure for reducing the switching loss of a range of switching converters are presented. The proposed snubber cell has several advantages over existing snubbering techniques. First, it provides zero-current-switching and zero-voltage-switching conditions for turning on and off, respectively, the switch over a wide load range. Second, it does not introduce extra voltage stress on the switch. Third, by taking the ripple current through the switch into account, the peak switch current during the snubber resonance period is designed to be less than the designed switch current without the snubber. Hence, the proposed snubber does not introduce extra current stress on the switch. The operating principle, procedure of designing the values of the components, and soft-switching range of the snubber will be given. The connections of the snubber cells to different switching converters will be illustrated. A performance comparison among the proposed snubber and a prior-art snubber will be addressed. The proposed snubber has been successfully applied to an example of a 200-W, 380-V/24-V, 100-kHz two-switch flyback converter. Experimental results are in good agreement with the theoretical predictions.
Keywords :
snubbers; switching convertors; zero current switching; zero voltage switching; ZCS; ZVS; frequency 100 kHz; passive lossless snubber cell; peak switch current; power 200 W; switching converters; two-switch flyback converter; voltage 24 V; voltage 380 V; zero-current-switching; zero-voltage-switching; Passive lossless snubber; snubbers; soft switching; switching technique;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2010.2042074