A Novel Single-Phase Buck PFC AC-DC Converter With Power Decoupling Capability Using an Active Buffer

• Published in: IEEE transactions on industry applications Vol. 50; no. 3; pp. 1905 - 1914
• Main Authors: Ohnuma, Yoshiya, Itoh, Jun-Ichi
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.05.2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: AC-DC power converters; Active control; Buffers; Capacitors; Choppers (circuits); Converters; Decoupling; Electric potential; Indium phosphide; Inductors; Ripples; Switches; Voltage; Voltage control; power conversion; AC¿DC power converters; capacitors
• ISSN: 0093-9994; 1939-9367
• DOI: 10.1109/TIA.2013.2279902

This paper discusses a new circuit configuration and a new control method for a single-phase ac-dc converter with power factor (P.F.) correction and a power pulsation decoupling function. The proposed converter can achieve low total harmonic distortion (THD) on the input current and the power pulsation decoupling function between the input and output sides, which allows low output voltage ripple even on a small output energy buffer at the same time using an active buffer. Therefore, the proposed converter does not require large smoothing capacitors or large smoothing inductors. The buffering energy is stored by a small capacitor, which controls the variation of the capacitor voltage through the active buffer. In this paper, the fundamental operations of the proposed converter are investigated experimentally. The experimental results reveal that the input current THD is 1.44%, the rate of the output voltage ripple is 6.33%, and the input P.F. is over 99%. In addition, a maximum efficiency of over 96% is obtained for a 750-W prototype converter.