Purpose of SCRs in Power Factor Circuit


Posted on Feb 7, 2014

I have a Power Factor Correction board that was taken from an old Sun Microsystem Spark450 power supply p/n 300-1359-xx. It has everything I need for a 650 watt inverter. The entire PFC circuit is not detailed in this image. The only part of the circuit I don`t understand is the purpose of the SCRs. I searched unsuccessfully for a circuit where th


Purpose of SCRs in Power Factor Circuit
Click here to download the full size of the above Circuit.

e cathodes of SCRs are tied together. I did find some very usesful SCR information from ON Semiconductor but nothing that matched. I have seen many PFC and Boost circuits, but none with SCR`s. My guess is that the SCRs inject a part of the half wave AC current into the inductor when the voltage level is sense by Q3/Q5 is low. Your help on this would be greatly appriciated.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

RF Inductance adaptor for multimeter
Geiger counter
Telephone Ring Converter Circuit
FM demodulation with RLC circuits applet
water sensor circuit using 555 timer
HC132 Selling Leads
nicola teslas electric car revealed
ADUC832 1.3MIPS 8052 MCU + 62kB Flash + 8-Ch 12-Bit ADC + Dual 12-Bit DAC
Cuckoo sound Generators
Put That Light Out
Complete Ar/Kr Ion Laser Power Supply Schematics
Pulse signal generating circuit and display
Thyristor cascade speed control circuit



Top