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[SOLVED] What is this call ? 110-220 AC stepdown to 12 DC 1A without

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T

tong

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I looking for power supply circuit
that input 110to220V AC
output 12V DC 1A
but don't use transformer like mobile
wall charge, notebook.. etc.

a tiny circuit is very good.

How you call this circuit ?
I don't know keyword to search.
Because I am Thai.

Have a good day.
 

btbass

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Try Calling it a "Switched Mode Power Supply"
Good luck.
 

Rayengine

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For "Switching mode power supply" topology, it also need a large inductor for energy store, so a large "transformer" cannot be eliminated in Switching mode design.

Rayengine
 

T

tong

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Thanx all. Look very complicate for new hobbie.

How it auto detect input voltage 110-220V ?
or they use chip IC control ?

Maybe I have to buy small SMPS module kit
in my local area. Thailand.
or buy the old mobile wall charge.
 

unkarc

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Hi Tong,

I think you can name it as a "transformerless AC/DC converter" and search for it that way as well.
Switch-mode power supplies employ PWM control (Pulse-Width Modulation) and it can also be used for sensing the input AC from 85V to 240V. But these circuits do include a transformer so do not refrain from it. If so,I can suggest visiting the Power Integrations Inc's URL at http://www.powerint.com the maker of clever control IC for such mains AC/DC converters the TOPSwitch family. They have application notes and even design ideas in Acrobat PDF format.

Regards

unkarc
 

Alexg

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On 2001-11-14 12:25, tong wrote:
How you call this circuit ?
I don't know keyword to search.
Because I am Thai.
Withour a transformer or inductor for 1A I would call it impossible ! For up to about 100 ma you can drop the voltage using a capacitor. Over that you have to have a transformer or at least an inductor and a switching supply. Power integration has some nice IC's that are quite simple to use. But beware, you need the right components, specially for the transformer and diodes.

Best regards,
Alexg
 

synq

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Have a look in the wdbsite for PICO transformers and dc dc converters..

Further have a look at new TI switching components..it doesnot say your exact purpose but it will give you lot of information towards ur subject
 

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