Title :
New phase-shifted soft-switching PWM high-frequency series resonant inverters topologies and their practical evaluations
Author :
Nagai, Satoshi ; Michihira, Masakazu ; Nakaoka, Mutsuo
Author_Institution :
Dept. of Electr. Eng., Tsuyama Natl. Coll. of Technol., Japan
Abstract :
This paper is concerned with a novel control scheme for full-bridge series-resonant phase-shifted PWM inverter. This control scheme is based upon varying inverter frequency adaptively according to load circuit parameters and phase-shifted angle φ. As a result, switching losses and stresses are minimized under phase-shifted power regulation. High frequency series-resonant inverters using this control technique and static induction power devices are practically applied to a 30 kHz-500 kHz high-power induction heating and melting power supply. The trially-produced inverter breadboards using static induction transistors are successfully demonstrated and discussed from a practical point of view. Finally, zero-voltage soft-switching effects of lossless capacitive snubbers are mentioned for an inverter circuit design which is incorporated into one switching leg of the full-bridge configuration
Keywords :
PWM invertors; adaptive control; bridge circuits; frequency control; induction heating; phase shifters; power transistors; resonant power convertors; snubbers; static induction transistors; switching circuits; voltage control; 30 to 500 kHz; HF; adaptive frequency control; circuit design; full-bridge; induction heating; load circuit; lossless capacitive snubbers; phase-shifting; power supply; series resonant PWM inverters; soft-switching; static induction transistors; switching leg; switching losses; switching stresses; zero voltage switching;
Conference_Titel :
Power Electronics and Variable-Speed Drives, 1994. Fifth International Conference on
Conference_Location :
London
DOI :
10.1049/cp:19940977
