A direct current source is required to supply a controlled current of 20A to a load in which the resistance varies from 0 to 12 ?. The source consists of a 208 V(L-L) , 60 Hz , there -phases , a controlled bridge rectifier, and a large series inductor .
A) Determine the maximum and minimum values of the firing angle
B) Determine the maximum and minimum values of the source power factor.
C) Determine the maximum and minimum values of the source KVA.