Dynamic load impedance correction for induction heaters

Author

Sewell, H.I. ; Stone, D.A. ; Howe, D.

Author_Institution

Dept. of Electron. & Electr. Eng., Sheffield Univ., UK

Volume

1

fYear

1999

fDate

1999

Firstpage

110

Abstract

The efficiency of induction systems is critically dependant on the electrical and magnetic properties of the load. However, since these change dramatically as the temperature passes through the Curie point, induction heaters are usually designed to deliver maximum power into the load either before or after this point. This paper shows that dynamic control of the workhead impedance is possible, to better match the workhead to the inverter, both before and after the work-piece passes through its Curie temperature. This, therefore, improves the power delivery to the load, and dramatically decreases the time taken for the load to reach a required temperature

Keywords

Curie temperature; DC-AC power convertors; electric impedance; induction heating; invertors; load (electric); power inductors; Curie point; Curie temperature; dynamic control; dynamic load impedance correction; efficiency; electrical properties; induction heaters; inverter; magnetic properties; power delivery improvement; workhead impedance; Coils; Equivalent circuits; Impedance; Inductance; Inverters; Magnetic materials; Magnetic properties; RLC circuits; Resonance; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Drive Systems, 1999. PEDS '99. Proceedings of the IEEE 1999 International Conference on

Print_ISBN

0-7803-5769-8

Type

conf

DOI

10.1109/PEDS.1999.794545

Filename

794545