Saturday 15 August 2015

charger - Why AC supply is rectified first before stepping voltage down?


I have opened one of my phone chargers and was trying to understand how it works.. I found IC MB6F just at AC input which came out to be a bridge rectifier.


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My question is why AC is first rectified instead of stepping it down with transformers ? As stepping down in DC with a buck converter wouldn't be as efficient as with transformers, why is this path chosen ?




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