ultra small dc regulator

[killabyte]

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

 

[aolalde]

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.

 

[amptramp]

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...

 

[jbartos]

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

 

[killabyte]

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

 

[nbucska]

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>