A nearly unity power factor isolated Class-D resonant inverter for series multi-coil induction hardening

This paper presented a nearly unity power factor isolated Class-D resonant inverter for series multi-coil induction hardening. The main switch are operated under the zero voltage switching condition and used leakage inductance and magnetite inductance of high frequency transformer apply to LLC reson...

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Bibliographic Details
Published in2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) pp. 1 - 5
Main Authors Haema, J., Bilsalam, A.
Format Conference Proceeding
LanguageEnglish
Japanese
Published IEEE 01.05.2014
Subjects
Coils
Electromagnetic heating
Inductance
induction hardening
isolated class-D resonant inverter
Resonant frequency
Resonant inverters
RLC circuits
series muti-coils
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Summary:This paper presented a nearly unity power factor isolated Class-D resonant inverter for series multi-coil induction hardening. The main switch are operated under the zero voltage switching condition and used leakage inductance and magnetite inductance of high frequency transformer apply to LLC resonant tank. A prototype was Class-D resonant operating 102-110 kHz variable frequency, when as heat up is 1 coil and heat up are 2 coil 800 and 730 W maximum input power. Experimental results, in a heat up each coil induction hardening had a nearly unity power factor, it can be heat up work pieces a size diameter 9.5-mm from room temperature to 400 o C within time about 50 second, 1 minutes and 94%, 92% efficiency at maximum full power.
DOI:10.1109/ECTICon.2014.6839825