Title :
A novel, self-excited, PWM forward converter with ZVS resonant transition using two minor-loop-operated saturable cores
Author :
Gu, Wen-Jian ; Harada, Koosuke
Author_Institution :
Dept. of Electron., Kyushu Univ., Fukuoka, Japan
fDate :
29 Jun-3 Jul 1992
Abstract :
A self-excited forward power converter is proposed. The turn-on and turn-off transitions of the switch are zero voltage switched resonant transitions. Two saturable cores operated in minor B- H loop are used to achieve such transitions. The waveform of the voltage across the switch is trapezoidal, and the current flowing in the switch is a quasi-square-wave. The switching losses are considerably reduced, and the stresses in the switch are significantly suppressed. The converter has load characteristics similar to those of a square-wave pulse-width-modulated (PWM) forward converter. The on duty ratio is modulated by a small current applied to the winding of one core. Experiments on a 350 kHz, 100 W DC-DC power converter show good performance
Keywords :
power convertors; pulse width modulation; saturable core reactors; switching circuits; 100 W; 350 kHz; DC/DC; PWM; ZVS; minor B-H loop; on duty ratio; performance; saturable cores; self-excited forward power converter; switching losses; turn-off transitions; turn-on; winding; Circuits; Magnetic resonance; Pulse width modulation; Pulse width modulation converters; Stress; Surges; Switches; Switching converters; Switching loss; Zero voltage switching;
Conference_Titel :
Power Electronics Specialists Conference, 1992. PESC '92 Record., 23rd Annual IEEE
Conference_Location :
Toledo
Print_ISBN :
0-7803-0695-3
DOI :
10.1109/PESC.1992.254695
