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Transformer in SMPS Use AC or DC to Work?

By on August 6, 2013

Just want to ask the transformer use for SMPS is use AC or DC? Because what I know is that all transformer use AC to function. It’s confuse me, when I read book, it’s use MOSFET/IC to control the SMPT but IC is DC right. Please advice.. Correct me if i’m wrong.

Answer:

Linear transformer have to use AC to work but switch mode transformer has to use DC supply and it is switched on and off rapidly by a FET to produce AC voltage at the secondary side. The working principle is different from linear transformer. Click the below link to check out more information about switch mode power supply:

http://en.wikipedia.org/wiki/Switched-mode_power_supply

 

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