| Author |
Message |
tong
Guest
|
 14 Nov 2001 13:25 |
|
|
|
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.
|
|
| Back to top |
|
 |
btbass
Joined: 20 Jul 2001
Posts: 865
Helped: 63
Location: Oberon
|
| 14 Nov 2001 15:35 |
|
|
|
Try Calling it a "Switched Mode Power Supply"
Good luck.
|
|
| Back to top |
|
|
Rayengine
Joined: 18 May 2001
Posts: 314
Helped: 3
|
| 15 Nov 2001 3:25 |
|
|
|
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
|
|
| Back to top |
|
|
tong
Guest
|
| 15 Nov 2001 10:48 |
|
|
|
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.
|
|
| Back to top |
|
|
unkarc
Joined: 28 Apr 2001
Posts: 282
Helped: 36
|
| 16 Nov 2001 16:21 |
|
|
|
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
|
|
| Back to top |
|
|
Alexg
Joined: 14 May 2001
Posts: 51
|
| 16 Nov 2001 23:51 |
|
|
|
| Quote: |
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
|
|
| Back to top |
|
|
synq
Joined: 21 May 2001
Posts: 65
|
| 17 Nov 2001 1:49 |
|
|
|
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
|
|
| Back to top |
|
|
