A power factor correction circuit, switching power supply and display

Abstract

The invention discloses a power factor correction circuit. The power factor correction circuit comprises a converter and a transformer, wherein the input end of the converter is used as the input end of the power factor correction circuit; the input end of the transformer is connected with the output end of the converter, and the output end of the transformer is used as the output end of the power factor correction circuit; the converter is used for converting input voltage to pre-set voltage and outputting the voltage to the transformer; and the transformer is used for transforming the pre-set voltage to obtain output voltage. The invention further discloses a switching power supply applying the power factor correction circuit and a display device. According to the power factor correction circuit disclosed by the invention, the converter is used for converting the input voltage to the pre-set voltage and the transformer is used for transforming the pre-set voltage, so that a wide voltage input range is realized and is wider than a voltage input range of an existing PFC circuit; and the conversion efficiency is high.

Description

technical field [0001] The invention relates to the technical field of electric power, in particular to a power factor correction circuit, a switching power supply and a display. Background technique [0002] Most of the PFC (Power Factor Correction) circuits currently used in TV monitors use Boost circuits or transformers for isolated boosting. However, in traditional Boost circuits, when the output voltage is greater than 10 times the input voltage, the circuit The efficiency is very low and the output and input cannot be isolated, so the voltage input range is relatively small; when the commonly used topology is used for transformer boosting, it is difficult to achieve a wide range of input. Contents of the invention [0003] The object of the present invention is to provide a power factor correction circuit, a switching power supply and a display to realize the input of a wide voltage range, aiming at the above-mentioned shortcomings of the existing power factor correc...

AI Technical Summary

Problems solved by technology

[0002] Most of the PFC (Power Factor Correction) circuits currently used in TV monitors use Boost circuits or transformers for isolation and boosting. However, in traditional Boost circuits, when the output voltage is greater than 10 times the input voltage, the circuit The efficiency is very low and the output and input cannot be isolated, so the voltage input range is relatively small; when using the commonly used topology for transformer boosting, it is difficult to achieve a wide range of input

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