Title :
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
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;
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
DOI :
10.1109/IECON.1993.339256
