Continue to Site

# 110/220 AC to 5/12 DC without Transformer

Status
Not open for further replies.

#### azerm

##### Member level 1
power supply without transformer

Hello,

I need a circuit for 5v/12v DC supply from 110/220 AC. The common way is to use a transformer, a bridge and a voltage regulator. I know this way, but it is needed to be done without using trans becasue of its weight. The maximum current is 500 mA. A friend told me to use HV capacitors instead of Trans to reduce the AC voltage, the other parts are the same.

Is it possible to make this circuit? Is any idea about it? Does anybody know any reference?

#### IanP

ac to dc without transformer

Transformless Power Supply:

Regards,
IanP

### azerm

Points: 2

#### Davood Amerion

220 ac to 12 dc

transformerless power supply for 500mA current
is not economic. it is better to use switching power supply with one IC and small ferrite transormer

#### flatulent

12dc 220ac

There is also the safety issue. Transformers should always be used in home built projects.

#### marie65

##### Super Member
ferrite transformer ac to dc

Check Rohm's AC/DC modules:

### azerm

Points: 2

#### Sebi

##### Member level 3
220 ac to 5 dc

The X2 type capacitor for 500mA is quite bigger than a small transformer!
Check the Power Integration TOPswitch-serie.

#### nikhilele

supply without transformer

Code:
Davood Amerion Posted:
transformerless power supply for 500mA current
is not economic. it is better to use switching power supply with one IC and small ferrite transormer

#### manu

##### Full Member level 3
12 dc transformer

See this topic :

power supply design without transformer

it low amp. i want 5A how i do?

#### Electronics Boy

##### Newbie level 4
circuit+220v+without transformer

use TOP Switches such as TOP226 . see datasheet .

#### eem2am

##### Banned
500ma transformerless power supply

yes ok, but remenber ing as already said for safety of isolation via trxformer is good.

but you can just rectify and use a buck converter if you wanmt...but it will have low duty cycle but who cares ?

so just use a buck.....and a high side driver u use bootstrap driver as you dislike pulse transformer i think.

and can the LNK306 DO 500 mA...? if it can ur prob is solved

it is from powerint.com

what about a tapped buck converter....which has longer duty cycle for you.

Status
Not open for further replies.