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light weight power supply

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a7mad

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NOKIA phones' old charger used to be heavy. I figured it has a normal transformer and normal power-supply design.
The new charger is noticably lighter that it cannot have a transformer in it, it also charges faster.
Could anybody plz explain? Also if the schematic is available, plz post it
Salaam
 

They are very likely using an off line switching supply with a much smaller transformer (because of the higher switching frequency).
 

Hi,
Also in the earlier designs if the charger was left unconnected but powered on, it would become dysfunctional. Newer ones do not. Is it possible that there is no transformer at all?
BR
M
 

as flatulent said, the solution is switching power supply.
Currently u can minimize the charger by integrated switchers like those provided by power itegrations.
go to:
**broken link removed**
for several small Integrated charger samples.
fro designing transformer, go to application notes page:
**broken link removed**

BEST!
 

nokia charger is mainly produced by astec. I think the older is linear power supply with normal transformer , the newer is switch mode power supply high frequency transformer.
 

For some architecture they used the high power resistor to reduce the potential to low before put inside the charger circuit.
 

hi
see power integration site,they have small size SMPS solutions.

(for ex. switching chragers,switching power adaptors)
 

someone once open the charger,it is a very simple
circuits ,it even dont use mosfet, but bipolor transistor ,thus reducing cost!
 

you got take into account that the new phones consume less energy too,
thus a lightweight charger...
 

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