Pulse Width and Pulse Frequency Modulation Pattern Controlled Active Clamp ZVS Inverter Link AC-DC Power Converter Utility AC Side Active Power Filtering Function for Consumer Magnetron Driver

The grid voltage of commercial utility power source in Japan and USA is 100 rms, but in China and European countries, it is 200 Vrms. In recent years, in Japan 200 Vrms out putted single phase three wire system begins to be used for high power applications. In 100 Vrms utility AC power applications and systems, an active voltage clamped quasi-resonant inverter circuit topology using IGBTs has been effectively used so far for the consumer microwave oven. In this paper, presented is a half bridge type voltage-clamped high-frequency inverter type AC-DC converter using which is designed for consumer magnetron drive used as the consumer microwave oven in 200 V utility AC power system. This zero voltage soft switching inverter can use the same power rated switching semiconductor devices and three-winding high frequency transformer as those of the active voltage clamped quasi-resonant inverter using the IGBTs that has already been used for 100 Vrms utility AC power source. The operating performances of the voltage source single ended push pull type inverter are evaluated and discussed for consumer microwave oven. The harmonic line current components in the utility AC power side of the AC-DC power converter operating at ZVS-PWM strategy reduced and improved on the basis of sine wave like pulse frequency modulation and sine wave like pulse width modulation for the utility AC voltage source.