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

    Two-tones Siren with IC 4093
    LED SignBoard with PIC 16F84A
    Scoring Game circuit
    simple FSK/AFSK Modulator
    35 Ampere Power Supply
    relay tutorial
    MPF102 FET Preamplifier Arduino
    Automotive LED Timing Light
    Highly Efficient 0-100% LED Dimmer
    PLL pulse generator(74HC4060 TC9122P)



    Top