Hobby Electronics Basics less current consuming circuit for led lamp

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less current consuming circuit for led lamp sg858585 07-02-08
Posted by on July 2, 2008, 6:25 am
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i am working on a project called less current consuming led lamp,and
the major idea of this project is less consumtion of current and
compact in size.so i have planned to take out transformer ,which
consume lot more space,so i want a help from u guys how to isolate the
current from 230v/50hz supply to 12v dc supply with out
transformer.were i am using a dimmer circuit but the current
consumstion is more.the spefication of led is 12v/3watt.

so i hope u help me out

Posted by terryc on July 2, 2008, 7:40 am
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On Wed, 02 Jul 2008 03:25:22 -0700, sg858585 wrote:


> so i hope u help me out

Err, buck converters / switching mode power supplies are basically what
you should be looking at.

what voltage are your leds?

Try fiddling with and old PC power supply.

AIUI, to get better efficency than the trnasformer route, you need to
customise the SMPS to closely match load.


Posted by Bob Monsen on July 2, 2008, 12:40 pm
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>i am working on a project called less current consuming led lamp,and
> the major idea of this project is less consumtion of current and
> compact in size.so i have planned to take out transformer ,which
> consume lot more space,so i want a help from u guys how to isolate the
> current from 230v/50hz supply to 12v dc supply with out
> transformer.were i am using a dimmer circuit but the current
> consumstion is more.the spefication of led is 12v/3watt.
>
> so i hope u help me out


take out transformer, put in capacitor. use flameproof resistor.

View in courier font.

500V flameproof 1W diode
LINE ----- 10uF ---- 1R ------o---->|----o-- 12V
- |
zener ^ 5W 12V 3.3mF
| |
NEUTRAL-----------------------o----------0-- GND

You can get 250mA at 12V out of it.

If you need a more regulated supply, use a 15V zener
and regulate the output with a 7812

Not sure this is cheaper than a transformer, though,
since the cap and zener are fairly expensive.

Regards,
Bob Monsen


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