A single-phase fully-controlled thyristor converter is used to obtain an average voltage of 180 V with 10 A constant current to feed a DC load

Q. A single-phase fully-controlled thyristor converter is used to obtain an average voltage of 180 V with 10 A constant current to feed a DC load. It is fed from single-phase AC supply of 230 V, 50 Hz. Neglect the source impedance. The power factor (round off to two decimal places) of AC mains is  

Solution:

Given that,

average output voltage (Vo) = 180 V

output current (Io) = 10 A

supply voltage (Vs) = 230 V

In a single phase full controlled converter,

Power factor = 0.9 cos α = 0.7823 lag