Optimum Design of a ZCS High Frequency Inverter for Induction Heating

Hiroyuki OGIWARA  Mutsuo NAKAOKA  

IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.3   pp.847-855
Publication Date: 2002/03/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
high-frequency inverter,  induction-heating,  soft switching,  si device,  optimum design,  

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This paper describes the circuit design procedure of the zero-current soft switching (ZCS) high frequency inverter for induction heating uses. Its output power can be regulated from its maximum to minimum by the instantaneous current vector control scheme using phase shift control between switching units at a fixed frequency. In addition, it can be safely operated since no extraordinarily high voltage or current results even at a short-circuit period at the load. Also, its overall efficiency reaches 90%. The detailed load and frequency characteristics of the inverter are elucidated by the computer-aided simulation. Then, the circuit design procedure is presented, and practical numerical examples are obtained according to this procedure which reveal that the inverter is highly practical and the design procedure is effective. The trial inverters yielding 2 kW or 4 kW were actually prepared. The observed values of the voltages and currents of the inverters were found to be in good agreement with the calculated ones. These facts certificate the validity of the proposed design procedure.