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Self-Tuning Sensorless Digital Current-Mode Controller with Accurate Current Sharing for Multi-Phase DC-DC Converters

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4 Author(s)
Lukic, Z. ; ECE Dept., Univ. of Toronto, Toronto, ON ; Ahsanuzzaman, S.S. ; Prodić, A. ; Zhenyu Zhao

A sensorless multi-phase average current-program mode controller with an accurate self-tuning current estimator is introduced. Based on the values of the duty ratio, and the input and output voltages, the estimator calculates the average inductor current of each phase in a multi-phase dc-dc converter. The averaged values are calculated over one switching cycle. The estimator employs a phase-by-phase self calibration scheme. During the calibration, regulators of all currents but one are "frozen" and a small load step is intentionally introduced, by a test current sink. Based on the response, the parameters of the active phase are automatically adjusted such that accurate estimation and equal current sharing are achieved. Experiments with a 12 V-to-1.5 V, 60 W, 500 kHz, two-phase buck converter verify that the controller ensures fast estimation and, at the full load, a current sharing error of less than 5%.

Published in:

Applied Power Electronics Conference and Exposition, 2009. APEC 2009. Twenty-Fourth Annual IEEE

Date of Conference:

15-19 Feb. 2009