AC/DC flyback converter with improved power factor and reduced s

Details AC/DC flyback converter with improved power factor and reduced s AC/DC flyback converter with improved power factor and reduced s

1998-03-02

1999-11-23

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 97, 363132, H02M 3335

Patent

active

059911727

ABSTRACT:
A new single stage, single switch input current shaping circuit features substantially reduced turn-on switching losses of the switch in the flyback-converter. In this technique, the turn-on switching losses due to the discharge of the output capacitance of the switch are reduced by turning on the switch when its voltage is minimal or close to the minimal. To achieve the turn-on loss reduction for a wide range of line and load conditions, the flyback-converter stage is continuously operated at the boundary of the CCM and DCM by employing a variable-frequency control. In this technique the boost inductor can work either in the DCM or the CCM. The wide-bandwidth, variable-frequency control is implemented by detecting the onset of the DCM/CCM boundary and, subsequently, turning the switch on at the minimum switch voltage. The switch is turned off when the increasing primary current reaches a reference level set by the output-voltage feedback control circuit.

REFERENCES:
patent: 5301095 (1994-04-01), Teramoto et al.
patent: 5424933 (1995-06-01), Illingworth
patent: 5515257 (1996-05-01), Ishii
patent: 5523936 (1996-06-01), Leu et al.
patent: 5581451 (1996-12-01), Ochiai
patent: 5652700 (1997-07-01), Tsai et al.
patent: 5757626 (1998-05-01), Jovanovic et al.
Jinrong Qian and Fred C. Lee, A High Efficient Single Stage Single Switch High Power Factor AC/DC Converter With Universal Input, Feb. 1997, pp. 281-287

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