A Novel Soft Switching PWM Power Frequency Converter with Non DC Smoothing Filter Link for Consumer High Frequency Induction Heating

Abstract

In this paper, high frequency power converter without DC smoothing electrolytic capacitor filter link which convert the 100 V/200 Vrms and 60 Hz single phase utility frequency AC power into a high frequency AC. This proposed high frequency AC power converter without electrolytic capacitor filter can operate under a principle of soft switching PWM based on a lossless capacitor snubber is proposed and demonstrated for consumer high frequency induction heating (IH). In particular, this high frequency power converter capable of producing a high frequency AC more than 20 kHz is developed for consumer IH applications as hot water producer and steamer based on the specially designed spiral type IH-Dual Packs Heater (DPH), which includes the dual mode pulse modulation control scheme based on soft switching PWM for high output power setting and commercial frequency AC zero voltage soft switching pulse density modulation (PDM) for low output power settings. This developed high frequency power frequency converter using trench gate IGBTs is clarified on the basis of experimental and simulation results for its circuit operation of the utility frequency AC to high frequency AC frequency PWM power converter without the electrolytic capacitor bank DC filter link for the IH hot water and IH steamer. These IH appliances are based upon an innovative electromagnetic IH-DPH for fluid heating as heat exchanger in consumer pipeline. Finally, its power regulation characteristics, power conversion efficiency and harmonic current components characteristics including power factor in utility AC grid side are evaluated and discussed from an experimental point of view. The practical effectiveness of this utility frequency AC to high frequency AC soft switching high power frequency converter defined conveniently as high frequency soft switching cyclo-inverter is proved as one of the important products effective for next generation IH application all electricity power utilizations. AC PWM AC PDM DPH Keywords: high frequency AC power conversion, soft switching PWM, utility AC zero voltage soft switching PDM, dual mode pulse modulation, IH fluid heating in pipeline, dual packs heater (DPH) as a steamer * EESRC 631-701 EESRC, The

A Bridgeless BHB ZVS-PWM AC–AC Converter for High-Frequency Induction Heating Applications

“…Another types of singlestage ac-ac converter have been proposed by using bidirectional switches [12] [13], but the reliability of this new type of power device is not up to the practical level. The capacitorboosted ac-ac converter that is free of the DBR, named as "bridgeless", has been proposed [14] [15], however no actively voltage regulation can be performed.…”

“…Selection of the NSDC-link capacitors C 1 , C 2 has great relevance with the PFC operation as well as the load seriesresonant frequency f r defined in (14). In order to achieve the PFC operation based on A-PWM scheme, C 1 , C 2 should be small enough to include the frequency component of two times as high as the utility frequency in v d with low distortion of the line current i in .…”

Single‐Stage ZVS‐PWM AC‐AC Power Converter Using All SiC Power Module for High‐Frequency Induction Heating Applications

“…A number of schemes of power conversion from single-phase utility-frequency ac (UFAC) to highfrequency ac for home and professional induction heating (IH) appliances were proposed so far [2,3]; particularly, we proposed a bridgeless single-stage zero voltage soft-switching (ZVS) pulse-width modulation (PWM) controlled ac-ac converter (below referred to as merely "proposed ac-ac converter") as shown in Fig. 1 [4][5][6].…”

Development of Multiresonant ZVS High‐Frequency Inverter

“…Soft switching circuits using zero‐voltage switching (ZVS) and zero current switching (ZCS) or a combination of the two have been actively developed as a countermeasure to the increasing switching loss associated with the use of higher frequencies in high‐frequency inverters that are used in induction heating and high‐frequency link dc–dc converters . The switching loss can be reduced by these soft switching circuits, but problems involving the settings of the load range arise, owing to limits on the soft switching region due to the relation between the load circuit constants and the operating frequency.…”