Building my own mobile phone charger

[Mahammad]

I want to build a charger for my phone whose output should be 3.7v ,800mA.WITH input 220v ,50 hz,10mA, Ac.do any one have idea on this

 

[keith1200rs]

That doesn't sound like a charger specification. 3.7V 800mA sounds like the battery specification. Most chargers generate a nominal 5V nowadays and the charge intelligence is in the phone.

Keith

 

[kapilp]

What you need is a charger for a 3.7V 800mA Li-ion(?) battery. This can be accomplished by using simple wall-mount 5V adaptor. The adaptor output is then given to the actual charging circuit. This circuit should have a dedicated battery charging IC (depending on the battery chemistry) and a few associated components. There are lots of such ICs available in the market form companies like Texas Inst., Microchip etc ... Choose the one that suits your application.

If you need a charger for your cellphone, simple check the adaptor specifications for the phone (should be 5V for a 3.7V battery), and use wall adaptors available in the market. Just remember to match the connector.

 

[alexan_e]

I think he is referring to charger of older models like NOKIA ACP-7E AC ADAPTER 3.7V 355mA 230VAC Charge CELLPHONE 3220 NOKIA ACP-7E AC ADAPTER 3.7V 355mA FOR EUOROPE CELL PHONE 3220 [ACP-7E] - $19.99 : ADAPTERS - POWER SUPPLIES - AC - DC - Chargers - Batteries!, ADAPTERS - POWER SUPPLIES - AC - DC - Char
that had a 3.7v output although his current requirement seems high.