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:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    60W FM Linear amplifier
    Thermostat Switch For Automotive Electric Fans Circuit
    gas leakage alarm
    How to Increase TDA2030 Amplifier Gain PCB
    2N5003 Transistor
    Microchip PIC Programmer ICSP Circuit Guide
    RC PIC
    Logic Probe Plans
    Sensitive optical receiver amplifier



    Top