The DC-DC converter of Figure 12.36 is used to control the speed of a DC motor. Let the supply voltage be 120 V and the armature resistance of the motor be 0.15?. The motor back-emf constant is 0.05 V/rpm, and the switching frequency is 250 Hz. Assume that the motor current is free of ripple and equal to 125 A at 120 rpm.
a. Determine the duty cycle of the converter ? and the converter on time t1.
b. Determine the average power absorbed by the motor.
c. Determine the apparent power supplied by the source.
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