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FPGA-based real-time harmonic impedance measurement of series resonant loads by using lock-in algorithm

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6 Author(s)
Jiménez, O. ; Dept. Ing. Electron. y Comun., Univ. de Zaragoza, Zaragoza, Spain ; Barragan, L.A. ; Urriza, I. ; Lucia, O.
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This paper presents a field programmable gate array (FPGA) implementation of a digital circuit that measures in real-time the first harmonic load impedance of medium-frequency (25 kHz - 75 kHz) induction-heating cooking appliances. The load impedance of these systems, which consist of a planar inductor coupled to a pan, depends on the pan material, temperature, and frequency. For this reason, real-time load measurement is desirable for a proper control of the inverter. For computing this impedance, a dual-phase lock-in algorithm is applied to the inverter output voltage and load current. The algorithm has been implemented using a hardware description language (HDL). The implemented circuit is simulated by means of mixed-signal simulation tool. From these simulations, the accuracy of the method is evaluated. Finally, the simulations are experimentally verified.

Published in:

IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society

Date of Conference:

7-10 Nov. 2011

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