A three phase bridge inverter with Y(star/wye)-connected load?

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Joined Dec 3, 2008
who can help me solve this 2 question
(a) A three phase bridge inverter supplies power to a balanced star connected resistive load. It is operating in 180 degee conduction mode. Sketch the circuit diagram and the timing diagrams for phase and line-to-line output voltage waveforms . Discuss and justify each segment of the waveforms by equivalent circuit diagrams for the respective conduction intervals.
(b) If the dc supply voltage is 500 V, determine the RMS values of the phase and line- to line load voltages.