Why is SMPS' bridge diode rectifier before the transformer

Thread Starter

abdulbadii

Joined Aug 30, 2017
38
Why is SMPS' bridge diode rectifier before the transformer which won't/shouldn't work having a DC input ?
Can anyone crystal clearly but succinctly explain how or which is the processes of DC step down ?
 

Papabravo

Joined Feb 24, 2006
16,938
There are at least three different power conversion schemes I can think of that you could be talking about. Which one do you have in mind?
 

crutschow

Joined Mar 14, 2008
27,894
Likely the bridge rectifies the AC input voltage to provide DC for the switching circuit that drives the transformer with a square-wave.
The output of the transformer then also has one or more diodes to generate the output DC voltage.
 

Thread Starter

abdulbadii

Joined Aug 30, 2017
38
The DC is chopped to make high frequency. The high frequency chopped ac lead reduction in transformer sizing.
Would you please elaborate it to an extend which'd be an informative modern electronic technology knowledge
 
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