Reduction of low-frequency output voltage ripple for isolated high-power-factor AC–DC converter

ABSTRACT

In the article, an isolated high-power-factor AC-DC converter, combining the buck-boost and flyback converters, is developed based on only one switch. With a suitable design of the voltage across the output capacitor of the buck-boost converter in the proposed circuit, the low-frequency output voltage ripple can be reduced. Therefore, the proposed converter possesses a smaller low-frequency output voltage ripple than the traditional AC–DC flyback converter does. In addition, the voltage stress on the output capacitor of the buck-boost converter in the proposed circuit can be varied by the turns ratio of the transformer so as to increase design elasticity. And, some experimental results are provided to verify the effectiveness of the proposed circuit.

KEYWORDS:

• Buck-boost converter
• flyback converter
• coupling inductor
• power factor correction
• low-frequency voltage ripple

Disclosure statement

No potential conflict of interest was reported by the authors.