Abstract
The equivalent load of an induction hob is strongly dependent on many parameters such as the switching frequency, the excitation level and the size, type, and material of the vessel. However, real-time methods with the ability to capture the variation of the load with the excitation level have not been proposed in the literature. This is an essential issue as most of the commercial induction hobs are based on an ac-bus voltage arrangement. This article proposes a method based on a phase-sensitive detector that offers an online tracking of the equivalent impedance for this type of arrangements. This algorithm enables advanced control functionalities such as clustering of vessels, material recognition, and premature detection of ferromagnetic saturation, among others. After simulation and experimental validation, the method is implemented into a prototype with a system-on-chip to verify its real-time behavior. The proposed approach is applied to different real-life situations that prove its great performance and applicability.
Highlights
The equivalent load of an induction hob is strongly dependent on many parameters such as the switching frequency, the excitation level, the size, type and material of the vessel, etc
Since the goal of this work is to obtain the variation of the load with the excitation level, the cutoff frequency of the low pass filter (LPF) has to be above the bus frequency, fB, but below the minimum switching frequency, fsw, otherwise the ac terms in (8) would not be attenuated
The prototype consists of two half bridge series-resonant inverter (HBSRI) that are fed by the rectified mains
Summary
The equivalent load of an induction hob is strongly dependent on many parameters such as the switching frequency, the excitation level, the size, type and material of the vessel, etc. Real-time methods with the ability to capture the variation of the load with the excitation level have not been proposed in the literature This is an essential issue as most of the commercial induction hobs are based on an ac bus voltage arrangement. This paper proposes a method based on a phase sensitive detector that offers an online tracking of the equivalent impedance for this type of arrangements This algorithm enables advanced control functionalities such as clustering of vessels, material recognition and premature detection of ferromagnetic saturation, among others.
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