A three-phase fully controlled bridge converter operating from a 3 phase 220 V, 50 HZ supply is used to charge a battery bank with a nominal voltage of 240 V. The battery bank has an internal resistance of 0.01 Ω, and the battery bank voltage varies by ± 10% around its nominal value between fully charged and uncharged condition. Assume the conduction is continuous.
The battery bank is charged with a constant average charging current of 100 A through a 250 mH lossless inductor.
Which of the following is / are true?1
The minimum value of the firing angle of the converter is 26.88°
2
The maximum value of the firing angle of the converter is 43.08°
3
The minimum ac input power factor is 0.69
4
The maximum ac input power factor is 0.85