By applying phase-shifted full-bridge and soft switch technology and PFC(Power Factor Correction) technology,the switch loss and the whole size of the power supply are reduced.

The correspondence power supply with the power factor correction and put to pull out the function of the heat;

An automatic storage battery charger based on active power factor correction;

Designing the power factor correction system based on DSP;

Pulse-wide modulation(PWM) rectifier is a novel type of power factor correction(PFC),having many superior performances than the no-controlled rectifier,such as: high power factor,nearly sinusoidal supply current,working in regeneration,excellent dynamic performance and so on.

A basic principle and its application of power factor correction(PFC)control based on a motor control digital signal processor(DSP)—ADMC401are introduced in detail.

According to the design ideology of softswitched extended-period quasi-resonant two-level Boost converter circuit,a soft switching cell of extend-period quasi-resonant had been added to the three-level Boost converter for power factor correction(PFC) applications,then a fully and simple soft-switched extended-period quasi-resonant three-level Boost converter for PFC circuit can be obtained.

The principle of the inversion are welding power souree and the necessity to use PFC are introduced.

PFC is one of the key points in the design of power supply.