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how mobile phones convert Aternating voltage to direct voltage? Answered

there is no big transformer in a mobile phone charger but still it is able to convert A.C to D.C though it is small

Tags:charger

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user
bwrussell (author)2012-02-25

It's not big because your phone requires low voltage and current, like @burf said. The more power you need the bigger the circuitry, that's why your laptop and xbox have such big transformers. Heat also becomes a problem, so those larger transformers need more space for heat-sinks and a lot more safety features due to the higher voltages and currents.

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steveastrouk (author)2012-02-24

Converting AC to DC is dead easy. Converting DC to AC takes special, small fast electronics.

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user

Can you please explain how coverting A.C to D.C becomes easy in phone chargers?
Please dont explain voltage rectifier circuits. I heard that it is some thing different

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iceng (author)steveastrouk2012-02-24

+1
it's not fair that AC=>DC is so easy when DC to AC is comparatively hard :-(

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steveastrouk (author)2012-02-24

In modern phone chargers, the incoming mains is rectified to DC, and then chopped back into DC on a very very small transformer. The faster you can make the current in the transformer change, the smaller it can be for the same power handling.

Steve

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Burf (author)2012-02-24

Because you don't need a physically large transformer. A small transformer can convert household AC line voltage to AC low voltage and a simple diode bridge and capacitor can convert the AC low voltage to DC low voltage.

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