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.
Industrial Electronics, IEEE Transactions on
Volume 52, Issue 1, Feb. 2005 Page(s): 108 - 115
Digital Object Identifier   10.1109/TIE.2004.841127
Summary: 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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