Introduction to  Single Phase Soft Switching Power Factor Correction Converter:

Introduction to power factor correction converter:

To reduce the harmonics generated in the single phase circuits which has a negative effect on the receiver is reduced by power factor correction converter. The PWM control is used obtain switching. The entire construction consists of four groups, ZVS (zero  voltage switching), ZCS (zero current switching), ZCT (zero current transition) and ZVT (zero voltage transition) which are the advanced switching techniques which completely reduce the switching power losses. The power factor correction converter can work in high and low load conditions.

Operation of Power factor correction converter:

The circuit is built by using a auxiliary switch and a resonant circuit. Bt using the ZVT and ZCT techniques are used for switching the semiconductors. A sunbber circuit is used to overcome the low harmonics and power factor losses. Here the main switch and auxiliary switch and main diode are fed with the output of the ZVT and ZCT operational stages. By using SS we can even switch semiconductors in low load conditions. By using coupling inductance the current stress is reduced on the switches. By adding the ZCT,ZVT and PWM to the active snobbery to booster circuit the PFC is obtained.


The AC-DC converters serve the same purpose but they have many drawbacks like poor quality of injected current and slow ripple rate and poor power factor which causes voltage distortions. The size of this equipment is relatively big when compared to that of correction converters. By employing SS (soft switching) in these converters the low harmonics and higher switching losses are overcome. 98% efficiency is obtained in power factor correction converter even in full load conditions.

Download ECE Final Year Project on Single Phase Soft Switching Power Factor Correction Converter .