will you please remind me of your rectifier question as the egregious fairies have stolen it along with the quiz, and I didn't get a chance to write it down.
I presume you have found it now - but in case it was the full wave 3 phase rectifier that ripples at twice the frequency you may expect.
Clearly a 4 diode bridge gives 100Hz ripple on the output, and needs a smoothing cap that can tide over a good fraction of 10mSec to hold up the Dc between pulses.
A 3 phase bridge with 6 diodes (one phase to each diode) gives 6 pulses per full cycle, as each phase goes to max pos or neg. The ripple is at 300Hz
(car alternators are often wired like this) A smaller capacitor is acceptable for the same p-p ripple.
But there is another version, with even more diodes, that exploits the phase shift between star and delta waveforms, that has higher frequency ripple yet.
Folk who have worked for London underground on DC traction supplies, or who have visited Kempton Park Pumping station should be going 'aha' immediately.
I could come back with a schematic if there is demand,
I presume you have found it now - but in case it was the full wave 3 phase rectifier that ripples at twice the frequency you may expect.
Clearly a 4 diode bridge gives 100Hz ripple on the output, and needs a smoothing cap that can tide over a good fraction of 10mSec to hold up the Dc between pulses.
A 3 phase bridge with 6 diodes (one phase to each diode) gives 6 pulses per full cycle, as each phase goes to max pos or neg. The ripple is at 300Hz
(car alternators are often wired like this) A smaller capacitor is acceptable for the same p-p ripple.
But there is another version, with even more diodes, that exploits the phase shift between star and delta waveforms, that has higher frequency ripple yet.
Folk who have worked for London underground on DC traction supplies, or who have visited Kempton Park Pumping station should be going 'aha' immediately.
I could come back with a schematic if there is demand,
