Duty-ratio feedforward for digitally controlled boost PFC converters
Van de Sype, D.M.
Koen De Gusseme
Van den Bossche, A.P.M.
Melkebeek, J.A.
Dept. of Electr. Energy, Ghent Univ., Belgium;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Feb. 2005
Volume: 52,
Issue: 1
On page(s): 108- 115
ISSN: 0278-0046
INSPEC Accession Number: 8275533
Digital Object Identifier: 10.1109/TIE.2004.841127
Current Version Published: 2005-02-07
Abstract
When a "classical" current control scheme is applied, the line current of a boost power-factor-correction (PFC) converter leads the line voltage, resulting in a nonunity fundamental displacement power factor and in important zero-crossing distortion in applications with a high line frequency (e.g., 400-Hz power systems on commercial aircraft). To resolve this problem, a current-control scheme is proposed using duty-ratio feedforward. In this paper, the input impedance of the boost PFC converter for both the classical current-loop controller and the controller using duty-ratio feedforward are derived theoretically. A comparison reveals the advantages of the proposed control scheme: a low total harmonic distortion of the line current, a resistive input impedance, virtually no zero-crossing distortion, and a fundamental displacement power factor close to unity. The theoretical results obtained are verified using an experimental setup of a digitally controlled boost PFC converter.
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