Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Input voltage selection method of half-bridge series resonant inverters for all-metal induction heating applications using high turn-numbered coils

  • Jin, Juil (School of Electrical Engineering, Ulsan National Institute of Science and Technology) ;
  • Kim, Mina (School of Electrical Engineering, Ulsan National Institute of Science and Technology) ;
  • Han, Jinwook (Cooking Control Team, LG Electronics) ;
  • Kang, Kyelyong (Cooking Control Team, LG Electronics) ;
  • Jung, Jee-Hoon (School of Electrical Engineering, Ulsan National Institute of Science and Technology)
  • Received : 2020.04.28
  • Accepted : 2020.08.31
  • Published : 2020.11.20
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Abstract

All-metal induction heating (IH) systems have been introduced to heat both ferromagnetic and non-ferromagnetic pots using dual resonant frequencies. They are designed for heating ferromagnetic pots using a first harmonic operation mode (FHOM) and for heating the non-ferromagnetic pots using a third harmonic operation mode (THOM). All-metal IH systems employing dual resonant frequencies consist of an IH inverter and a power factor correction (PFC) circuit to transfer desired power to pots by increasing the input voltage of the IH inverter. In this paper, the input voltage is designed to obtain an efficiency-optimized operating point. To obtain an appropriate input voltage, power loss analyses are conducted using first harmonic approximation (FHA). Based on analysis results, the input voltage of the IH inverter can be selected to improve its power conversion efficiency. A 2-kW half-bridge series resonant inverter prototype is implemented to verify the effectiveness of the proposed design by heating ferromagnetic pots using the FHOM with a 2-kW transfer power and by heating non-ferromagnetic pots using the THOM with a 1-kW transfer power.

Keywords

Acknowledgement

This research was supported by LG Electronics.

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