Linear-regulated PFC (Power Factor Correction) control circuit and control method

Abstract

The invention discloses a linear-regulated PFC control circuit which comprises a PFC input voltage sampling module, a PFC input current sampling module, a PFC output voltage sampling module, a PFC control circuit module, a PFC output voltage-boosting power circuit module and a PFC linear regulation module, wherein the PFC linear regulation module is used for generating a linear regulation parameter of the linear regulation for the current loop control executed by the PFC control circuit module within the range from a heavy load to a light load according to the input current sampled by the PFC input current sampling module, and the PFC control circuit module is used for generating a wave generating signal of the linear regulation control for the PFC output voltage-boosting power circuit module according to the linear regulation parameter. An inner loop parameter is linearly regulated by utilizing the size of the load or the input current to finish effective wave shape control and obtain index optimization within a full-load range, and meanwhile, the overall efficiency within the light-load range is improved and the reactive power loss is reduced.

Description

technical field [0001] The invention relates to power supply or power distribution technology, in particular to a PFC (power factor correction) control circuit and control method with linear regulation. Background technique [0002] Improving the efficiency of power electronic devices plays a vital role in improving the utilization rate of electric energy. In power electronic converter devices, the input rectification device accounts for more than 80%, and most of them adopt phase-controlled rectification, and the power factor is low. Injecting a large number of high-order harmonics into the power grid wastes electric energy, which is commonly referred to as electric pollution. In order to reduce the harmonic pollution caused by nonlinear loads to the AC power grid, more and more strict restrictions have been put forward on the input harmonic current of switching power supply equipment at home and abroad. In particular, the widespread application of high-power power supply ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a PFC control circuit with linear adjustment, which solves the problem of low reliability of the system through linear adjustment, especially solves the problem of input performance indicators when the PFC circuit in the power supply device is light-loaded

[0007] Another object of the present invention is to provide a PFC control method with linear adjustment, which solves the problem of low system reliability through linear adjustment, especially solves the problem of input performance indicators when the PFC circuit in the power supply device is light-loaded

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