1. A full-wave single-phase passive rectifier is given below:
The input AC voltage is 120 V at 60 Hz.
(a) Find the average dc-link voltage when there is no filter capacitor.
(b) Calculate the maximum dc-link voltage that this passive rectifier can reach.
(c) What would be the minimum diode voltage rating that can safely operate this rectifier assuming the dc-link voltage is at its peak (estimated from (b))?
2. A full-wave three-phase passive rectifier is given below:
The input AC voltage is 240 V (line-to-line) at 60 Hz.
(a) Find the average dc-link voltage when there is no filter capacitor.
(b) Calculate the maximum dc-link voltage that this passive rectifier can reach.
(c) What would be the minimum diode voltage rating that can safely operate this rectifier assuming the dc-link voltage is at its peak (estimated from (b))?
(d) Assuming the phase AB, BC, and CA line-to-line voltage waveforms are given below:
During the period from 30 to 90 degree, which diodes from the rectifier circuit will turn on?
Which diodes will turn on during 270 to 330 degree?
3. A three-phase inverter is given below:
The input DC voltage is 400 VDC.
(a) What is the maximum line-to-line voltage and rms line-to-line voltage?
(b) What is the maximum line-to-neutral voltage (phase voltage) and rms phase voltage of this inverter?