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Subject: Re: How to do a 220V AC to 12V DC and 24V DC without a transformer ?
Date: Thu, 16 Jan 2003 03:05:52 +0000 (UTC)
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Richard Freeman wrote:
> "Vincent Clerc" wrote in message
>> I have to design a circuit that connects to the main power (220V AC) and
>> transform it to 24V DC (3 amps) and 12V DC (3Amps too).
>> Given the amps, a transformer based solution is to big and emits too much
> Suggestions :
> 1) put up with the extra weight of a Transformer if the secondary side is
> going to be earthed a Toroidal Transformer will save space and weight
> 2) buy an off the shelf SMPS which does what you want given the level of
> expertise you appear to have (judging by your need to ask this question) may
> be the safest bet and of course even an SMPS will generate quite a bit of
Not much, if it's a better class of SMPS.
The better ones do well over 90%, so under 10W is probable.
Under 5W, if willing to spend a bit more.
http://inquisitor.i.am/ | mailto:email@example.com | Ian Stirling.
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