Title

Analysis and Design of an Adaptive-Step-Size Digital Controller for Switching Frequency Autotuning

Authors

Authors

J. A. Abu-Qahouq; W. Al-Hoor; W. Mikhael; L. Huang;I. Batarseh

Comments

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Abbreviated Journal Title

IEEE Trans. Circuits Syst. I-Regul. Pap.

Keywords

Adaptive control; conduction loss; digital control; efficiency; power; converter; power loss; step size; switching loss; variable frequency; DC-DC-CONVERTERS; VOLTAGE; IMPLEMENTATION; EFFICIENCY; Engineering, Electrical & Electronic

Abstract

An adaptive-step-size autotuning algorithm and controller for power converters' switching frequency optimization with improved convergence performance is presented in this paper. The controller automatically tracks and determines the switching frequency of a power converter in order to achieve the highest power conversion efficiency under variable operating conditions including temperature variation effects, component aging effects, component's manufacturing process differences, input voltage changes and load current changes. The adaptive-step-size function results in improved adaptive controller convergence speed, convergences error and stability. In this paper, the proposed autotuning control loop for a power converter is theoretically analyzed and its design and stability criteria are developed. The developed algorithm operation is verified by experimental results obtained from a proof of concept prototype.

Journal Title

Ieee Transactions on Circuits and Systems I-Regular Papers

Volume

56

Issue/Number

12

Publication Date

1-1-2009

Document Type

Article

Language

English

First Page

2749

Last Page

2759

WOS Identifier

WOS:000273568400005

ISSN

1549-8328

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