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Simple transformers: how do they adjust to different input voltages (100V-240V)

lemcts

Jul 24, 2022
1
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Jul 24, 2022
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1
I use the same transformer for my 20V laptop, in the US and in Europe with just a different adapter.
How does it work? Thanks.
 

crutschow

May 7, 2021
467
Joined
May 7, 2021
Messages
467
That's not a transformer by itself, it's a switching regulator circuit, which can be designed to work from a large range of input voltages.
It uses a rectifier bridge to convert the AC to DC, and then uses a switching regulator, which operates at a high frequency to allow the use of a small transformer to reduce the voltage to the desired 20Vdc.
The circuit uses feedback to keep the output at this constant voltage, independent of the input voltage.
 
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