|
KMID : 0896219960160010873
|
|
Journal of Daegu Health College
1996 Volume.16 No. 1 p.873 ~ p.888
|
|
|
A study of Unity Power Factor for Rectifier
|
|
Chun Jung-Ham
|
|
|
Abstract
|
|
|
|
Recently AC-DC converters have been used widely for condenser input type rectifier which has a simple structure. However, this circuit have a low power factor be-cause input current flows while the input source voltage greater than the capacitor voltage. To improve that, it has been studied about AC-DC converter using rectifier and chopper. 0he methode of chopper control has merit in which waveform and power factor is improved. The kinds of chopper control are a methode controlling inducter current continuously and discontinuously. The former controls input waveform with a PWM in the sinusoidal wave as voltage and current found and its control is very complecated. The latter relatively is simple for controlling chopper and results in the effect of power factor improvement as controlling source current. and it can operate three phase high power factor converter by a switch but this kind of method can be possibly zero current switching as turned on of the control device and can be high turn off loss as turned off it being operated in the maxi-mum current. This control method is called HARD SWITCHING. This paper propose soft switching type three phase high power factor converter by switching loss of the turn off is decreased with using lossless subber condenser. Proposed circuit decreased switching loss operating can be possibly ZCS, ZVS with using the partial resonant switching topology which is resonant circuit just as switching and have a merit which brings efficiency increasing as it makes to the source a regeneration of accumulated energy in subber condenser. Therefore it can increase the total efficiency of the circuit. Relatively simple circuit composition and soft switching three phase converter which has low loss came true.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|