ac dc conversion question.

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ljy4468

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Hi all
I have some stupid question about ac-dc conversion.

As you already know, diode-bridge is connected to AC line and rectified voltage is go through flyback stage in case of flyback ac-dc smps.

- AC Plug -> Diode bridge -> Flyback stage


Then let me write a stupid question.
How about below construction?

- AC Plug -> transformer (10:1) -> diode bridge -> buck or boost stage.

It is electrically isolated from AC to output.

But I've never seen that configuration. So anyone tell me why that's not used?

Thanks in advance.
 

But I've never seen that configuration. So anyone tell me why that's not used?
I don't agree.

Transformer power supplies with secondary switch-mode converter have been used for decades and are still used. But these days primary switch mode converters ("off-mains" switchers) are preferred due to weight and size savings.
 

Thanks for your answer.
Could you please let me know any example of transformer power supplies? (Transformer front-end instead of diode bridge)
I cannot find any url.
Thanks.
 

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