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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Zheng-Feng Li & Jhih-Cheng Hu & Ming-Shi Huang & Yi-Liang Lin & Chun-Wei Lin & Yu-Min Meng, 2022. "Load Estimation for Induction Heating Cookers Based on Series RLC Natural Resonant Current," Energies, MDPI, vol. 15(4), pages 1-19, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:4:p:1294-:d:746442
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    References listed on IDEAS

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    1. Pradeep Vishnuram & Gunabalan Ramachandiran & Thanikanti Sudhakar Babu & Benedetto Nastasi, 2021. "Induction Heating in Domestic Cooking and Industrial Melting Applications: A Systematic Review on Modelling, Converter Topologies and Control Schemes," Energies, MDPI, vol. 14(20), pages 1-34, October.
    2. Yongseung Oh & Jaeeul Yeon & Jayoon Kang & Ilya Galkin & Wonsoek Oh & Kyumin Cho, 2021. "Sensorless Control of Voltage Peaks in Class-E Single-Ended Resonant Inverter for Induction Heating Rice Cooker," Energies, MDPI, vol. 14(15), pages 1-12, July.
    3. Sang Min Park & Eunsu Jang & Dongmyoung Joo & Byoung Kuk Lee, 2019. "Power Curve-Fitting Control Method with Temperature Compensation and Fast-Response for All-Metal Domestic Induction Heating Systems," Energies, MDPI, vol. 12(15), pages 1-16, July.
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