Input Power Factor Corection System (PFC System)

4. a) Input Power Factor Correction Sub-System : ( For Pro901 & Pro902 )

    The purpose of power factor correction (P.F.C.) circuit is to make a constant bus for    

    Inverter in Buck and Boost mode. The schematic is indicated in figure 8.

    When the input AC power cord is plugged in, the AC relay is activated and the AC  

    power goes through noise filter to the charger and to the line detector. Both DC buses 

    present voltages at about 1.4 times of input RMS voltage. When the UPS is in Buck or 

    Boost mode, the P.F.C. circuit is enabled and the DC bus is regulated at 360 Vdc.

4. b) Input Power Factor Correction Sub-System : ( For Pro903 )      
    The purpose of power factor correction (P.F.C.) circuit is to make the input current   
    and voltage in phase and therefore achieve a high input power factor near to 1. The 
    schematic is indicated in figure 7.When the input AC power cord is plugged in, the AC  
    relay is activated and the AC power goes through noise filter to the charger and to the 
    line detector. Both DC buses  present voltages at about 1.4 times of input RMS voltage. 
    When the "on" switch is pressed, the P.F.C. circuit is enabled and the DC buses are 
    regulated at ±360 Vdc.