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Power Measurement by Output-Current Integration in Series Resonant Inverters

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6 Author(s)
Artigas, J.I. ; Dept. of Electron. Eng. & Commun., Univ. of Zaragoza, Zaragoza ; Urriza, I. ; Acero, J. ; Barragan, L.A.
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In many applications, efficiency and service quality are improved with an appropriate power control. This paper focuses on a power-measurement method designed to deal with medium/high frequencies (tens to hundreds of kilohertz). It requires a previous knowledge of application and exploits some characteristics of the power topology and control, in this case, a full-bridge series resonant inverter. It is a new method based on a low-cost analog circuit that integrates the high-frequency load current, in order to reduce the computational complexity of measuring power. Harmonic analysis is carried out to determine the A/D converter requirements, and the theoretical results are verified using a digital-signal-processor (DSP)-based experimental setup. The power measurement may be implemented on the microcontroller or low-performance DSP used to control the power stage, with an error below of 2% independent of the load and mains variations.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:56 ,  Issue: 2 )

Date of Publication:

Feb. 2009

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