Power-factor-segmentwatt-hour meter assesses fees according to user’s real-time power factor, and themeans of economic lever can be used to urge users to improve their power factors soas to improve the quality of electrical network.

Principle and approach to improve power factor of induction furnace of intermediate frequency;

Design and experiment of high power factor converter on arc welding inverter power source;

The Method of Group-Control for Electronic Ballasting of the High Power Factor;

The designing of switch power source high power factors converter;

Methods are explored to improve power factors of ion membrane of the rectifying device through control of the conduction angles.

By analysing the short net power factors and electricity pressure lowered of silicon furnace,it expounds the influences to efficency of voltage trans-ferance and production electricity consumption caused by short net function,it also discusses the method of improving short net funtions and achivements made.

A power-factor corrector of the small welding power inverter;

Simulation compute for power-factor of DC drive electric locomotive;

A.C—D.C Converter with the Power-factor Nearly Unity;

This paper introduces the harm caused by low power factor and harmonics,explaines the definitions of power factor and THD,dissertates the basic principle and the control methods of active power factor correction,introduces interior structure and working principles of UC3854-an IC used only on APFC s control,explains typical circuit of UC3854 and testing result,dissertates its ascendant capability.

This paper presents the operating principle of Active Power Factor Correction(APFC) circuit with one-cycle control.

The control circuits can be realized by using modified single phase PFC algorithm.