Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Enhanced load adaptive modulation of induction heating series resonant inverters to heat various-material vessels

  • Jeong, See‑Hoon (Full Bridge IH Taskforce, LG Electronics) ;
  • Jin, Ju‑Il (Product Development Team, Hanwha Solutions) ;
  • Park, Hwa‑Pyeong (Energy Efficiency Division, Korea Institute of Energy Research (KIER)) ;
  • Jung, Jee‑Hoon (Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST))
  • Received : 2021.11.10
  • Accepted : 2022.02.11
  • Published : 2022.06.20
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Abstract

Nowadays all-metal induction heating (IH) cooktops have become popular for heating various pots quickly and safely. A load adaptive modulation (LAM) method was proposed to improve the IH power delivery capability and the cost-effectiveness of an all-metal IH system. However, this method shows poor power conversion efficiency under light-load conditions since a high switching loss is induced using the pulse frequency modulation (PFM) method in the series resonant inverters for IH applications. In this paper, a multi-mode control strategy for an IH system employing the LAM method is proposed to improve light-load efficiency when compared with the conventional LAM method. The proposed multi-mode control algorithm automatically changes its modulation according to the pots' material-dependent resistance. The modulation method is selected to improve the light-load efficiency using the proposed control strategy. Experimental results demonstrate the validity and performance of the proposed multi-mode control algorithm with a 2-kW prototype IH series resonant inverter and various-material pots.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MIST) (No.2019R1A2B5B01069665).

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