FPGA-Based Power Measuring for Induction Heating Appliances Using Sigma–Delta A/D Conversion
Acero, J.; Navarro, D.; Barraga, L.A.; Garde, I.; Artigas, J.I.; Burdio, J.M.
Industrial Electronics, IEEE Transactions on
Volume 54, Issue 4, Aug. 2007 Page(s):1843 - 1852
Digital Object Identifier   10.1109/TIE.2007.898304
Summary:This paper presents a field-programmable gate array (FPGA) implementation of a digital circuit that measures in real time the output power of medium-frequency (25-50 kHz) induction-heated cooking appliances. The voltage and current are sensed using first-order sigma-delta (SigmaDelta) analog-to-digital converters. The power-measuring algorithm is very simple while maintaining good accuracy. The algorithm is developed using a hardware description language (VHDL). The digital circuit, the power converter, the signal conditioning circuits, and the SigmaDelta modulators are simulated all together using a mixed-signal (analog + digital) simulation tool. The algorithm error is obtained in simulation computing the average power using VHDL-Analog and Mixed-Signal Extension Language (VHDL-AMS), and the influence of different parameters is analyzed. Finally, the digital circuit is implemented in the FPGA, and the simulations are experimentally verified.

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