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Old 25th April 2005, 11:53 PM   #1
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Default Rectifier Bridge on heatsink?

I'm running an 800VA toroid with 55V secondaries into a 35A 600V bridge Rectifier. Is it necessary to have this mounted to a heatsink or is it OK mounted to the base plate of the chassis.

The base plate is 1/4 Aluminum.

Thanks

Brian
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Old 26th April 2005, 12:02 AM   #2
Stocker is offline Stocker  United States
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Mount it to the chassis and run it hard for several hours. If the thing stays below a "reasonable" temperature, you're good. If the rectifier gets too hot for your own comfort (or too hot to continue functioning), then you needed a heatsink. Add one and try again.

Without giving more detail, that's about as good an answer as you are likely to get.
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Old 26th April 2005, 06:17 AM   #3
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How many Farads are you charging?

As long as it's not crazy , check the mating to the base plate for good surface area of contact, apply a little BeO and bolt her down. If you need a heatsink for that I'd be surprised.
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Old 26th April 2005, 07:05 AM   #4
AndrewT is online now AndrewT  Scotland
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Hi,
that quarter inch ally plate is a large heatsink and lots of inertia to cope with peak loads.
I'm No.3 that thinks you will be OK.
Have you tried to calculate peak currents, at start up and running?
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Old 26th April 2005, 11:54 PM   #5
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Thanks for the help all. I figured the base plate would work. The amp I am building is a stereo ESP p101.

to amplifierguru:

I'm running 2 x 22,000 mfd per Rail. Total of 88,000 mfd.

to AndrewT:

I haven't done any detailed calculations about peak currents. Any equations?

I'll hook everything up and let it run for a while to see if it heats up excessively.
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Old 26th April 2005, 11:57 PM   #6
Jean is offline Jean  United States
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You should be just fine with bolting them to the bottom of the case w/o doing anything extra.
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Old 27th April 2005, 03:38 PM   #7
AndrewT is online now AndrewT  Scotland
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Hi,
do it the easy way, goto Duncanamps.com
find PSUdesigner
and plug in some transformer numbers.
http://www.duncanamps.com/psud2/index.html
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