Q1) Problem: A three-phase bridge rectifier has L = 4.5 mH, R = 2.52, and E = 10 V. The

input voltage (Line-to-neutral) is Vs = 100 V, at f = 60 Hz. Determine

1)

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2)

3)

4)

5)

6)

7)

8)

9)

10)

11)

12)

13)

14)

15)

The steady-state load current lo

The average output voltage Vac

The average output current lac

The average diode current Ipav

The rms output voltage Vrms

The effective (rms) value of the ac component of output voltage Vac

The form factor FF (voltage output)

The ripple factor RF (voltage output)

The rms output current Irms by considering the expression of the Fourier series of the

output voltage (up to n = 12)

The rms diode current Iprms

The rms value I, of the phase current (rms input current)

The output ac power

The output de power

The efficiency (or rectification ratio) n

Now, assuming that a high inductance is added in series to the load to reduce the current

ripples (ripple free average load current). In such a case,

a) Draw the waveforms for the load current, the diode current, and the input

current.

b) Determine the rms output current Irms

c) Determine the rms value Is of the phase current

d) Determine the angle and rms value Is1 of the fundamental of the phase

current

a) Determine the input power factor PF.

b) Determine the THD of the input current