Title :
An isolated fully soft-switched flyback converter with low voltage stress
Author :
Chung, Henry ; Hui, S.Y.R. ; Wang, W.H.
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, Hong Kong
Abstract :
An isolated fully soft-switched PWM flyback power converter topology with low switch voltage stress is proposed. The power converter features the use of the leakage inductance of the `flyback´ coupled inductors to achieve zero-voltage switching (ZVS) and/or zero-current switching (ZCS) of all switching devices. The method of implementation is simply to add an additional auxiliary circuit, consisting of a switched LC circuit to the conventional PWM flyback power converter. No extra active or passive voltage clamp circuit is needed to suppress voltage stress on the switching devices. A complete steady-state DC analysis and the operating principle are described. The performance of a 80 W experimental power converter prototype with dual output voltages is presented
Keywords :
DC-DC power convertors; PWM power convertors; inductors; power inductors; power semiconductor switches; switching circuits; 80 W; PWM flyback power converter topology; dual output voltages; experimental performance; flyback coupled inductors; leakage inductance; operating principle; soft switching; steady-state DC analysis; switch voltage stress; zero-current switching; zero-voltage switching; Circuit topology; Low voltage; Pulse width modulation; Pulse width modulation converters; Stress; Switches; Switching circuits; Switching converters; Zero current switching; Zero voltage switching;
Conference_Titel :
Power Electronics Specialists Conference, 1997. PESC '97 Record., 28th Annual IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-7803-3840-5
DOI :
10.1109/PESC.1997.616953