| 摘要 |
A power factor correction circuit with buck and boost conversions has a rectifying circuit, a buck circuit and a boost circuit. When an input AC voltage of the power factor correction circuit is a relative low voltage, the AC voltage is converted to low level voltage by the buck circuit and then converted to an intermediate voltage with a desired level by the boost circuit. When the input AC voltage is a relative high voltage, the boost circuit is turned off. The input AC voltage is rectified and bucked to the intermediate voltage with a desired level.
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