A single-switch AC/DC converter with voltage regulated storage capacitor

• Published in: IEEE power electronics letters Vol. 1; no. 3; pp. 78 - 82
• Main Authors: Dylan Dah-Chuan Lu, Cheng, D.K.-W., Yim-Shu Lee
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2003; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Alternating current; Capacitors; Circuits; Converters; Costs; DC-DC power converters; Direct current; Electric converters; Electric potential; Line voltage; Power factor correction; Regulators; Stress control; Switching converters; Topology; Voltage; Voltage control
• ISSN: 1540-7985; 1558-3767
• DOI: 10.1109/LPEL.2003.821586

A single-stage power-factor-corrected AC/DC converter (SSPFC) usually causes high voltage stress on the intermediate storage capacitor, due to the lack of control of this voltage. The storage capacitor voltage varies largely with line voltage, and load current and is usually higher than the peak line voltage. This paper presents a new single-switch SSPFC based on a flyback topology for which the storage capacitor voltage is loosely regulated by the output voltage. Without using extra power switches to increase the control dimension, the proposed converter uses a flyback converter with dual-output transformer to achieve the control purpose. The range of storage capacitor voltage change against the change of input voltage and load current is significantly reduced. Moreover, the maximum storage capacitor voltage can stay below the peak line voltage at high line condition. Experimental results verifying the operation of the proposed SSPFC are also reported.