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From: John Popelish
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X-Mailer: Mozilla 4.7 [en] (Win98; U)
Subject: Re: Inductor used in 110v to 15v
Date: Fri, 29 Nov 2002 01:20:03 GMT
NNTP-Posting-Date: Thu, 28 Nov 2002 20:20:03 EST
> I have a 950VA 110 to 13vac transformer. Would it be too tall of an order to get some advice on converting the output to DC? I
> know that I will need some high current diodes but I do not know how many nor which type. Also, how would I wire in the diode(s)?
> A diode allows a certain amount electricity to flow in one direction. I just do not understand how this behavior can convert to
> direct current. It can not be too complicated, right?
> Many Thanks,
Did you just buy one of these big transformers form ebay? I have one
on the way, and am anxious to see what it looks like.
You will need a bridge rectifier that can handle at least 73 amps
(950VoltAmps/13Volts=73amps) and at least
13volts*(square root of 2)=19volts
This tutorial covers the concept of a bridge rectifier.
Bridges in this current rating are usually made of 4 separate stud
mounted or otherwise heat sinkable diodes. Since each diode carries
current only half of the time, you might get by with diodes rated for
only half of the 73 amp rating of the transformer.
An example of a 75 amp 35 volt schottky diode (less heat production
than a junction diode) would be the 75HQ035 in a DO-5 stud mounted
case at about $10 each from Digikey.
You can mount two of them on one heat sink, since two of the studs
will get connected to build the bridge, but you will have to either
isolate the other two diodes from that heat sink, or mount them on
separate pieces of metal that are held in insulated mounts.
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