Title :
A half bridge flyback converter with ZVS and ZCS operations
Author :
Wu, Li-Ming ; Pong, Chen-Yin
Author_Institution :
Dept. of Electr. Eng., Ching Yun Univ., Jung-Li
Abstract :
An asymmetrical half bridge flyback converter without output inductor is presented in this paper, in which the power switches can be turned on with ZVS and the output diode can be turned on and off with ZCS. While the ZVS is obtained from the magnetizing current, the ZCS is achieved from the resonant current. The ZVS and ZCS conditions can be maintained for full load range. The characteristics of the proposed converter rely on the utilization of resonant inductor and blocking capacitor as resonant energy delivery devices rather than linearly charging and discharging components. The operational principle and circuit analysis of the proposed converter is described in this paper. The experimental test of a 90 W prototype converter is performed and the results are presented.
Keywords :
power convertors; zero current switching; zero voltage switching; ZCS operations; ZVS operations; blocking capacitor; half bridge flyback converter; power switches; resonant current; resonant energy delivery devices; resonant inductor; Bridge circuits; Capacitors; Circuit analysis; Circuit testing; Diodes; Inductors; Magnetic resonance; Switching converters; Zero current switching; Zero voltage switching;
Conference_Titel :
Power Electronics, 2007. ICPE '07. 7th Internatonal Conference on
Conference_Location :
Daegu
Print_ISBN :
978-1-4244-1871-8
Electronic_ISBN :
978-1-4244-1872-5
DOI :
10.1109/ICPE.2007.4692511
