Load-Adaptive Control Algorithm of Half-Bridge Series Resonant Inverter for Domestic Induction Heating

• Published in: IEEE transactions on industrial electronics (1982) Vol. 56; no. 8; pp. 3106 - 3116
• Main Authors: Lucia, O., Burdio, J.M., Millan, I., Acero, J., Puyal, D.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2009; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Acoustic noise; Acoustic pulses; Algorithm design and analysis; Algorithms; Control algorithms; Control theory; Current supplies; Density; Digital control; Domestic; Frequency; home appliances; Induction heating; Inductors; Inverters; Load; Modulation; Power generation; Pulse modulation; pulsewidth modulation; Resonant inverters; resonant power conversion; Temperature control
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2009.2022516

Domestic induction cookers operation is based on a resonant inverter which supplies medium-frequency currents (20-100 kHz) to an inductor, which heats up the pan. The variable load that is inherent to this application requires the use of a reliable and load-adaptive control algorithm. In addition, a wide output power range is required to get a satisfactory user performance. In this paper, a control algorithm to cover the variety of loads and the output power range is proposed. The main design criteria are efficiency, power balance, acoustic noise, flicker emissions, and user performance. As a result of the analysis, frequency limit and power level limit algorithms are proposed based on square wave and pulse density modulations. These have been implemented in a field-programmable gate array, including output power feedback and mains-voltage zero-cross-detection circuitry. An experimental verification has been performed using a commercial induction heating inverter. This provides a convenient experimental test bench to analyze the viability of the proposed algorithm.