230V to 24V/500mA

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#1
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Hi fellow freaks,

What is the smallest, dirtiest way (but still CE approved!) of going from 230V to 24V/500mA? Need to incorporate into a product and there wasn't any room for an external power supply. Small size is the key in this solution.

Any tip is welcome!

/Bjorn

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I do not understand your statement regarding there being no room for external supply. What does that mean? A wall wart would solve the problems of CE approval and put your product into a low voltage class which avoids problems with approvals. If you do not want to use a wall wart then you would need an AC power cord entry, transformer, etc. It is so much easier to use an available supply that is external. Look at all the routers, printers, etc that use them.

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Agree. Buying a CE-marked wall "transformer" will save you much grief. If you have to bring 230VAC into your hardware, you now have to deal with insulation and conductor separation and fuses and all sorts of nasty things like that. These are not an issue if you only have 24V.

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

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Thanks for you replies!

But here's the thing. My product shall be mounted outside in a IP/NEMA enclosure. No power socket to use. Sure Jim, I need to take into account all the fuses and insulation, but that's the hardway I wanna walk.

/Bjorn

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http://www.powerint.com/

Plenty of reading at this site. As others have warned this is not childs play. With the costs involved with approvals etc, it may be worth considering speaking to some experts.

oddbudman

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You don't say whether or not you need isolation. On Semiconductor have many low-cost solutions for off-line power supplies.

see
http://www.onsemi.com/PowerSolutions/supportDoc.do?type=AppNotes&category=449

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Maybe you should consider a small solar panel? Here in rural Texas many of my neighbors have them to power their electric gate openers. Just google solar gate opener and you should find lots of them.