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ultra small dc regulator

ultra small dc regulator

ultra small dc regulator

(OP)
developing a small dc regulator im trying to get 110 ac and then get 5vdc, @ 1A what do you think about rectify directly from 110vac, then using a SCR and a microcontroller to perform phase control, then a LC filter and at last a lm 5vdc regulator, i think it seems easy to develop and a small choice.

thankx for any comment,

killa

RE: ultra small dc regulator

My opinion is that rectifying directly from 110 VAC to get 5 VDC will result in low efficiency and high ripple since you have to chop your ac wave too much. I should use first an AC transformer to reduce the AC voltage close to your desired DCV output.

RE: ultra small dc regulator

Sounds like there would not be any isolation from the main  power line - not a good idea.

Switching power supplies are designed every day for your application. I was involved with a "wall wart" design. 110VAC to 5vdc @ 1.2 amp - it was a switcher with galvanic and optical isolation. Search the web for switching power supply theory...

RE: ultra small dc regulator

Suggestion: It depends. What will this small dc regulator be applied to?

RE: ultra small dc regulator

(OP)
thankx for your help, its necessary for you to know that there is very little space to put a transformer, galvanic isolation is not needed cause ill optocouple  to act over other devices.

power supply is an option but frequently involves a transformer.

its designed to charge a batt and to feed a mcu maximum 700mA.

any other comment will be of great help.

thankx

killa

RE: ultra small dc regulator

You can use switching supplies which use HF ferrite xformer.

For lower current you can use series capacitor, for 110V 60Hz you need 2.4 microF for each 100 mA.

<nbucska@pcperipherals.com>

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