A power-factor improved AC to DC converter

Author

Kuwabara, Kohji ; Kohsaka, Mitsuaki

Author_Institution

Fujitsu Ltd., Kawasaki, Japan

fYear

1990

fDate

22-25 Oct. 1990

Firstpage

107

Lastpage

111

Abstract

A new AC-to-DC converter is described which improves the power factor of the AC input line. The converter is composed of a forward converter and a flyback-derived voltage-commutated circuit. When the switching transistor is on, the induced voltage across the transformer is applied to the inductor of the feedback circuit, and energy is stored. When the input voltage is high, the voltage across the capacitor of the feedback circuit does not commutate to the input, while when the input voltage is low, the voltage across the capacitor of the feedback circuit is commutated to the input side capacitor. Therefore, the time duration of the input current is longer than the conventional one, and the power factor is improved. Analysis of the converter circuit and experimental results are presented.<>

Keywords

power convertors; power factor; AC input line; AC-to-DC converter; feedback circuit; flyback-derived voltage-commutated circuit; forward converter; induced voltage; inductor; input side capacitor; power factor; switching transistor; transformer; Capacitance; DC-DC power converters; Feedback circuits; Filters; Low voltage; Power supplies; Reactive power; Regulators; Switched capacitor circuits; Switching circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Telecommunications Energy Conference, 1990. INTELEC '90., 12th International

Conference_Location

Orlando, FL, USA

Type

conf

DOI

10.1109/INTLEC.1990.171232

Filename

171232