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Old 13th January 2008, 12:49 PM   #1
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Join Date: Apr 2006
Location: live in mountains
Question aleph and bridge rectifier

hello all

i have rectifier
MUR 820G
8A/200V

http://www.onsemi.com/PowerSolutions...t.do?id=MUR820

and

HFA08TB60
hexfred 8A/600V

http://www.irf.com/product-info/data.../hfa08tb60.pdf

can i use them in bridge rectifier for an aleph 5 and for an aleph 3

for the aleph 5 i use toroidals from nuvotem 2x25v 300va in dual mono configuration

the output current of 25vac is 6A i want to use only one bridge rectifier per channel
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Old 13th January 2008, 12:54 PM   #2
Zen Mod is offline Zen Mod  Serbia
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Default Re: aleph and bridge rectifier


yes;

iin first case you'll have 16A/400V Graetz and in second case 16A/1200V Graetz bridge
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Old 13th January 2008, 04:39 PM   #3
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Inrush current at turn-on is the problem, not normal operational currents. You might want to consider something rated a bit higher in the current department.

Grey
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Old 13th January 2008, 05:36 PM   #4
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when i watched the hexfred's datasheet


i can see

single pulse forward current =60A
maximum repetitive forward current =24A

inrush current at turn-on is it too high for this rectifiers ?
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Old 13th January 2008, 06:11 PM   #5
acaudio is offline acaudio  Germany
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Hi,

try the PSU Designer .
If yo use a big tranny and big capacitor bank, 60A single pulse can be to less. With a big toroid and huge caps the first charging impulse can go up to 300A. It can be necessary to use a small value, high power resistor (~0,2Ohm/10W) in series with the rectifier to reduce the incrush current.

I hope it helps.
Best Regards, Adam
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