A new induction heating circuit with clamped capacitor voltage suitable for heating to above Curie temperature

Author

Koertzen, H.W.E. ; Theron, P.C. ; Ferreira, J.A. ; van Wyk, J.D.

Author_Institution

Energy Lab., Rand Afrikaans Univ., Johannesburg, South Africa

fYear

1993

fDate

15-19 Nov 1993

Firstpage

1308

Abstract

The partial series-resonant power converter, previously only used for DC-DC converters, is applied to induction heating. The circuit is a half-bridge, series-resonant circuit with clamping diodes that constrain the voltage of the resonant capacitors to values between zero and the supply voltage. Three types of control are investigated: constant switching frequency; constant turn-off current; and a combination thereof. The latter seemed to be the best. This circuit is only found suitable for loads for which the Q value is low while the temperature of the workpiece is below the Curie temperature

Keywords

bridge circuits; control system analysis; electric current control; frequency control; induction heating; load (electric); power capacitors; power convertors; switching circuits; voltage control; Curie temperature; DC-DC converters; clamped capacitor voltage; clamping diodes; constant switching frequency; constant turn-off current; half-bridge circuit; induction heating; loads; partial series-resonant power converter; workpiece; Clamps; Cogeneration; DC-DC power converters; Diodes; RLC circuits; Resonance; Switched capacitor circuits; Switching frequency; Temperature; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics, Control, and Instrumentation, 1993. Proceedings of the IECON '93., International Conference on

Conference_Location

Maui, HI

Print_ISBN

0-7803-0891-3

Type

conf

DOI

10.1109/IECON.1993.339256

Filename

339256