I'm tinkering with a battery charger project and trying to define the following:

The application has a requirement of having a wide input voltage range, ~90-300VAC to then be stepped down to 12 or 24VDC. I know of many manufacturers who have this sort of set up and I know for a fact that they don't use a transformer. How else could it be done? Can somebody point me in the right direction?

Thanks,
Alex

 

A switching converter that operates from the a wide variation of mains voltage is used which efficiently converts the mains voltage to the desired dc voltage. They do use a transformer for isolation but it is in the high frequency switching loop so the transformer can be much smaller than a transformer operating at the main's frequency.

 

Please excuse my noob ness, I've never heard of these before. Can you show me the spec sheet of one?

 

Let me google that for you.

http://michaelgellis.tripod.com/power4.html

http://www.smps.us/smpsdesign.html

 

Let me google that for you.

http://michaelgellis.tripod.com/power4.html

http://www.smps.us/smpsdesign.html

Those are switched mode supplies operating from DC generated from a mains transformer. I am referring to a switched-mode supply that operates from the directly rectified line voltage such as described here under "Switched-mode Power Supply".

 

Use an ATX power supply as that is ready available giving out 12V , they can be modified to be variable, or you can build your own which is harder.

Failing that use an old laptop psu they will give out 12v to 20v, they can also be modified to give voltages down to 3v or less.

http://www.youtube.com/user/DodgyDavez

 

Thanks for all the replies. This is something I'm trying to do for work, it's more of an industrial application so I can't really depend on an ATX power supply. I will keep digging into and learning of these SMPS. If you have more resources, throw them at me

Thanks.

 

Anybody mind posting a link to a data sheet for one of these that are AC to DC smps? Can't seem to find any...

 

http://www.hardwaresecrets.com/datasheets/KA_KA7500C.pdf

http://www.eejournal.org/journal/2010102974/smps-schematic-tl494-2003#schematic-7500


http://www.datasheetcatalog.org/datasheet/texasinstruments/tl2844.pdf


http://www.datalinker.com.hk/uploads/spec/WT7522 V11.pdf

http://www.sg.com.tw/semigp/data/6105/6105-datasheet.pdf

 

can anyone help me?

i`m having a problem wih my battery charger.

 

can anyone help me?

i`m having a problem wih my battery charger.

Please don't hijack someone else's thread. Start a new one.

And tell us what your "problem" is. We're not clairvoyant.