Title :
Steady-state analysis of a ZVS-PWM series resonant converter with active-clamp technique
Author :
Tanaka, Hidekazu ; Ninomiya, Tamotsu ; Shoyama, Masahito ; Zaitsu, Toshiyuki
Author_Institution :
Dept. of Electr. & Electron. Syst. Eng., Kyushu Univ., Fukuoka, Japan
Abstract :
Steady-state analysis of a ZVS-PWM controlled series resonant converter with active-clamp technique is presented. In this paper, the normal load characteristics and abnormal voltage increase in the case of light load are analyzed. As a result, it is clarified that the stray capacitance of the transformer is a cause of the abnormal voltage increase. Then, it is confirmed that the abnormal voltage increase is suppressed by decreasing the duty ratio. ZVS condition is analyzed and confirmed experimentally. The ZVS is realized in a wide load range. The maximum efficiency of 89% is obtained for the output of 10 V and 2 A
Keywords :
PWM power convertors; capacitance; resonant power convertors; switching circuits; transformers; 10 V; 2 A; 89 percent; ZVS-PWM series resonant converter; abnormal voltage; abnormal voltage increase suppression; active-clamp technique; duty ratio decrease; light load; maximum efficiency; normal load characteristics; steady-state analysis; stray capacitance; Capacitance; Clamps; Inductors; RLC circuits; Resonance; Steady-state; Switches; Switching converters; Switching frequency; Voltage;
Conference_Titel :
Power Electronics Specialists Conference, 1998. PESC 98 Record. 29th Annual IEEE
Conference_Location :
Fukuoka
Print_ISBN :
0-7803-4489-8
DOI :
10.1109/PESC.1998.701968
