Load Estimation for Induction Heating Cookers Based on Series RLC Natural Resonant Current

Zheng-Feng Li, Jhih-Cheng Hu, Ming-Shi Huang, Yi-Liang Lin, Chun-Wei Lin and Yu-Min Meng
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Zheng-Feng Li: Department of Electrical Engineering, National Taipei University of Technology (NTUT), Taipei 10608, Taiwan
Jhih-Cheng Hu: Department of Electrical Engineering, National Taipei University of Technology (NTUT), Taipei 10608, Taiwan
Ming-Shi Huang: Department of Electrical Engineering, National Taipei University of Technology (NTUT), Taipei 10608, Taiwan
Yi-Liang Lin: Delta Electronic Inc., Taoyuan 33370, Taiwan
Chun-Wei Lin: Delta Electronic Inc., Taoyuan 33370, Taiwan
Yu-Min Meng: Delta Electronic Inc., Taoyuan 33370, Taiwan

Energies, 2022, vol. 15, issue 4, 1-19

Abstract: In domestic induction heating applications, cookware can be considered an equivalent load in a series resistor–inductor–capacitor resonant converter. Therefore, the electrical parameters of an equivalent circuit change according to the cookware material, size and the cookware position on the heating coil. This study proposes an online estimation method for detecting the cookware status, determining the material and estimating the equivalent heating resistance of cookware on an induction heating cooker (IHC) for power control. The proposed method could turn off the circuit in abnormal situations such as low equivalent heating coverage rate or non-ferromagnetic cookware and adjust the power in normal situations. In the method, a half-bridge series resonant converter (HBSRC) generates two test patterns with three resonant voltage pulses to detect cookware every 10 ms, only the current feedback information is needed to avoid the calculation loads and times necessary for complex signal operations in software. To verify the proposed method, a digital signal processor based HBSRC with 1000 W was constructed. The maximum errors between the estimated and measured resistance and inductance were 7.14% and 2.91%, respectively. Moreover, power control in emulated user operation reveal that the proposed method and control system can effectively estimate load online to detect cookware status and determine whether to turn off or vary the heating power for an IHC.

Keywords: induction heating cooker; online load estimation; power control; series RLC resonant converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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