Quasi-resonant ZVS-PWM inverter-fed DC-DC converter for microwave oven and its input harmonic current evaluations

摘要

In this paper, a circuit topology of an active voltage clamped quasi-resonant PWM inverter-type DC-DC converter using IGBTs is proposed in order to improve the function of conventional single-ended soft switching converter for a magnetron drive. This converter includes some advantages capable of clamping the peak voltage across the main power semiconductor switching device. In addition, the anode current was reduced by up to 1.2 A with a magnetron as a load of this converter. Furthermore, the special modulation pattern for the operating frequency and PWM of the inverter is also proposed in order to improve line current distortion and power factor in utility AC power side. Harmonic current components in utility grid AC power side are regulated under the condition of the peak value limitation of the anode current of magnetron and soft switching PWM strategy.