Dr. Alessio Beato Profile

Dr. Alessio Beato

at Univ Politecnica delle Marche

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Proceedings Article | 30 June 2005 Paper

Modeling of power control schemes in induction cooking devices

Alessio Beato, Massimo Conti, Claudio Turchetti, Simone Orcioni

Proceedings Volume 5837, (2005) https://doi.org/10.1117/12.608066

KEYWORDS: Switching, Control systems, Switches, Modulation, MATLAB, Frequency modulation, Resistance, Inductance, Instrument modeling, Amplitude modulation

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In recent years, with remarkable advancements of power semiconductor devices and electronic control systems, it becomes possible to apply the induction heating technique for domestic use. In order to achieve the supply power required by these devices, high-frequency resonant inverters are used: the force commutated, half-bridge series resonant converter is well suited for induction cooking since it offers an appropriate balance between complexity and performances. Power control is a key issue to attain efficient and reliable products. This paper describes and compares four power control schemes applied to the half-bridge series resonant inverter. The pulse frequency modulation is the most common control scheme: according to this strategy, the output power is regulated by varying the switching frequency of the inverter circuit. Other considered methods, originally developed for induction heating industrial applications, are: pulse amplitude modulation, asymmetrical duty cycle and pulse density modulation which are respectively based on variation of the amplitude of the input supply voltage, on variation of the duty cycle of the switching signals and on variation of the number of switching pulses. Each description is provided with a detailed mathematical analysis; an analytical model, built to simulate the circuit topology, is implemented in the Matlab environment in order to obtain the steady-state values and waveforms of currents and voltages. For purposes of this study, switches and all reactive components are modelled as ideal and the "heating-coil/pan" system is represented by an equivalent circuit made up of a series connected resistance and inductance.

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