Universal digital controller for boost CCM power factor correction stages based on current rebuilding concept
Entity
UAM. Departamento de Tecnología Electrónica y de las ComunicacionesPublisher
IEEEDate
2014Citation
10.1109/TPEL.2013.2280077
IEEE Transactions on Power Electronics 29.7 (2014): 3818 - 3829
ISSN
0885-8993 (print); 1941-0107 (online)DOI
10.1109/TPEL.2013.2280077Funded by
This work was supported in part by FEDER and the Spanish Ministry of Science TEC 2011-23612.Editor's Version
http://dx.doi.org/10.1109/TPEL.2013.2280077Subjects
Digital control; Power factor correction; Digital error compensation; Sensorless controller; Boost converter; Continuous conduction mode; TelecomunicacionesNote
Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. V. M. López, F. J. Azcondo, A. de Castro, R. Zane, "Universal Digital Controller for Boost CCM Power Factor Correction Stages Based on Current Rebuilding Concept", IEEE Transactions on Power Electronics, vol. 29, no. 7, pp. 3818 - 3829, July 2014.Rights
© 2014 IEEEAbstract
Continuous conduction mode power factor correction (PFC) without input current measurement is a step forward with respect to previously proposed PFC digital controllers. Inductor volt-second (vsL) measurement in each switching period enables digital estimation of the input current; however, an accurate compensation of the small errors in the measured vsL is required for the estimation to match the actual current. Otherwise, they are accumulated every switching period over the half-line cycle, leading to an appreciable current distortion. A vsL estimation method is proposed, measuring the input (vg) and output voltage (vo). Discontinuous conduction mode (DCM) occurs near input line zero crossings and is detected by measuring the drain-to-source MOSFET voltage vds. Parasitic elements cause a small difference between the estimated voltage across the inductor based on input and output voltage measurements and the actual one, which must be taken into account to estimate the input current in the proposed sensorless PFC digital controller. This paper analyzes the current estimation error caused by errors in the ON-time estimation, voltage measurements, and the parasitic elements. A new digital feedback control with high resolution is also proposed. It cancels the difference between DCM operation time of the real input current, (TDCMg) and the estimated DCM time (TDCMreb). Therefore, the current estimation is calibrated using digital signals during operation in DCM. A fast feedforward coarse time error compensation is carried out with the measured delay of the drive signal, and a fine compensation is achieved with a feedback loop that matches the estimated and real DCM time. The digital controller can be used in universal applications due to the ability of the DCM time feedback loop to autotune based on the operation conditions (power level, input voltage, output v- ltage...), which improves the operation range in comparison with previous solutions. Experimental results are shown for a 1-kW boost PFC converter over a wide power and voltage range.
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Google Scholar:López-Martín, Víctor M.
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Azcondo, Francisco Javier
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Castro, Ángel de
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Zane, Regan A.
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