Replacing Rectifier

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jkeny

Banned
2007-02-06 12:43 am
Dublin
Thank you Andrew, so I would need to use 4 * 10A diodes in full wave bridge mode to replace this rectifier & retain the same power handling?

Edit: Has anybody got a recommendation for a good, fast, soft recovery 30A diode to be used as rectifier in a digital amp, rectifying PS before input to switching trafo?
 
no,
the smoothing capacitors supply the transient current.
The rectifiers top up the smoothing caps.
I have power amps that use 1n5402 (3A) as discrete bridge rectifiers and they have never blown.

If you are using your amp properly then each channel could be ticking over with an average output of 1W/channel. Add on the quiescent dissipation of around 20W and total loading is under 30W.
That amounts to 375mA average rms charging current.
But rectifiers do not charge at RMS rate they switch on and off at mains frequency rate and peak currents are of the order of 10 times the average rate.
the peak current of many diodes is around 50 to 200 times their continuous rating.
 
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