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230V AC to 12V 3A conversion without transformer ?.
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sangar:
Hello All,

I need to design a power block to supply my processor board and it should be a compact one...The input will be 230V AC and output to be expected is 12V 3A. I have seen some reference design from Monolithic systems for this, it seems that >10W needs a transformer...If it is right, what are the reasons which require a transformer for >10W supply design...Please suggest.

Thanks,
Sangar


 
Ian.M:
Safety + capacitive droppers have horrible power factor and no load dissipation greater than their max output power.

Do what everyone else does and buy in a SMPSU power 'brick' with the required output voltage and current and all the safety approvals you need for your intended markets.   A 12V 4.1A (50W) SMPSU should be a commodity item as that voltage is commonly used in LED and Halogen lighting systems.
BravoV:
Try Vicor.
Zero999:

--- Quote from: Ian.M on February 11, 2019, 05:22:51 am ---Safety + capacitive droppers have horrible power factor and no load dissipation greater than their max output power.

Do what everyone else does and buy in a SMPSU power 'brick' with the required output voltage and current and all the safety approvals you need for your intended markets.   A 12V 4.1A (50W) SMPSU should be a commodity item as that voltage is commonly used in LED and Halogen lighting systems.

--- End quote ---
Yes, typically a SMPS is used, which does have a transformer, but it works at a much higher frequency, than the mains, so can be a tiny fraction of the size of a bulky mains transformer.

Beware, lots of halogen lighting PSUs are merely transformers driven by a Royer oscillator. They're unsuitable for powering most electronic circuits from because they output 20kHz to 200kHz modulated by double the mains frequency and commonly have a minimum load current requirement.

Here's an application note, showing the typical schematic, for educational purposes.
https://www.st.com/content/ccc/resource/technical/document/application_note/e5/88/46/11/35/8c/4a/bf/CD00003902.pdf/files/CD00003902.pdf/jcr:content/translations/en.CD00003902.pdf

A 12V LED power supply designed for LED strip is a better option. It will output steady DC and a suited for most electronic circuits.
sangar:
Hi All,

Thanks...Our requirement is that the power module to be designed should not exceed the board size of 50mm x 50mm and be bulky...As far as I searched, I couldn't find any power module which is within 50mm x 50mm...If one can design it in the given size, I am asking you to share the sources that guide me to design...

Thanks,
Muthu
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