A single stage induction heating high frequency series load resonant ZVS-PWM inverter with active filtering pfc rectifier operating at one diode conduction and ZCS commutation

This paper presents newly developed half bridge ZVS-PWM high frequency inverter using ZCS-PFC converter conducting full bridge 1 diode. This high-frequency inverter is composed of a passive PFC converter operating at one diode conducting bridge circuit and asymmetrical ZVS-PWM high frequency resonant inverter without the bulky electrolytic capacitor stage for boosted DC voltage smoothing. In addition, this proposed high-frequency resonant inverter has only one diode conducting mode in the diode bridge rectifier with boost inductor. The operating principle of the proposed series load resonant high frequency inverter is described by using the switching mode equivalent circuits in addition to the simulated operating voltage and current waveforms. The circuit parameters of proposed high frequency inverter design to achieve one diode conduction at the same time at diode bridge part by simulation analysis in this paper. The operating performances of this proposed ZVS-PWM high-frequency inverter are also illustrated on the basis of simulation analysis which includes its UFAC-to-HFAC power regulation characteristics, soft switching operating range, UFAC side power factor characteristics and UFAC side line current harmonics characteristics by FFT analysis. In principle, the effectiveness of this UFAC-to-HFAC direct power frequency converter using IGBTs for consumer high-frequency IH appliances is evaluated and proved on the basis of simulation results.

I. Introduction

In recent years, new application fields of high-frequency induction heating (IH) power technology in consumer and industry have developed more and more in all electricity power utilization systems as energy saving. For example, these IH appliances are IH cooking heater, IH rice cooker, IH hot water producer, IH steamer, and IH super heated steamer for cleaning, disinfecting, drying and cooking. These new IH applications in addition to microwave oven for food processor have been expanding dramatically with tremendous development of the core technology of the state-of-the art high-frequency power electronics in IH technology.