Power factor correction device

Abstract

The invention relates to a power factor correction device. An analog and digital conversion module is used for respectively converting one output signal, one sensing signal and one input signal of a power converter to generate a first digital signal, a second digital signal and a third digital signal, a feedback circuit is coupled with the analog and digital conversion module and generates a feedback signal according to the first digital signal, an operational circuit is coupled with the feedback circuit and receives and operates the feedback signal, the second digital signal and the third digital signal to generate a timing signal, a counting circuit is coupled with the operational circuit and generates a switching signal according to one triggering signal and the timing signal to switch a switch of the power converter. Therefore, the power factor correction device can be digitalized so that the stability of a system is increased, and the power factor correction device can be effectively digitalized so that the complexity of a circuit is reduced.

Description

technical field [0001] The present invention relates to a power factor correction device, in particular to a current mode power factor correction device. Background technique [0002] With the advancement of science and technology and the development of the economy, the demand for switching power converters is increasing day by day. In recent years, due to the great progress of power electronics technology, most of the electronic equipment tends to be thinner and smaller, and the internal power converter also needs to be designed towards the trend of thinner and shorter. Therefore, it has the advantages of small size, light weight and high efficiency. Switching power converters with high advantages have gradually replaced traditional linear converters and become the mainstream of power converters. In addition to the advantages of being short and light, the switching converter further improves the efficiency and quality of the converter. [0003] The traditional critical co...

AI Technical Summary

Problems solved by technology

[0006] Since the above-mentioned power factor correction circuit is an analog power factor correction circuit, the analog power factor correction circuit cannot be digitized, and the error amplifier and comparator included in the analog power factor correction device all use analog methods. With the drift of the process, large errors will be generated, and there will be stability problems

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