Pulse pattern modulated soft commutation inverter-type AC-DC power converter with harmonic current components reduction in utility power side

In this paper, a circuit topology of a half bridge quasi-resonant ZVS-PWM high frequency inverter type AC-DC converter using IGBTs for the consumer magnetron drive is presented, which can use the high frequency high voltage transformer, voltage doubler and power semiconductor switching devices (IGBTs) used in active voltage clamped quasi-resonant PWM inverters suitable for 100 V utility AC power systems. The operating analysis and characteristic evaluations of a switching power supply converter circuit for a microwave oven in a 200 VAC utility power system used in Europe, China and Japan are discussed on the basis of simulation and experimental results. Moreover, a new 60 Hz sinewave partial pulse modulation pattern control scheme of the pulse operating frequency modulation and pulse width modulation is proposed and discussed in order to improve harmonic current components in 200 V utility AC power grid under a condition of the peak limitation of the magnetron anode current.