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switching power supply

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Its an powersuply that feeds an transformer of coil at an realy high freqency To step up or step down the voltage.They are light and eficent.They also can suply higer powers becose of there high eficency(there is les heat that wod limit its output)
 
thanks but...can i get an example? a shematic of one?
cos' it seams to be piping out of so many places now and i want to understand it and how it works
thanks
 
If its working on mains you first have to thurn it to DC.Then you have some powerful transistors that are swtitched at about 10 to 300kHz they run a transformer whith an ferite core(normal transformers use an iron core) the output is thuned back to DC agen and its done.

This way transformers can be realy small and light(ferite is lighter than iron).So in a swicthomed you have an transformer the size of an 10W mains transformer but it can suply more than 200W!

Mobile phone charges now use switchmode PSUs.As you see there very light and small.The older phone charges ware big and heavy becose they used an mains transformer.

But switchmode PSUs have an disadvantege from linear PSUs!Switchmodes have electric noise in the output becose of the high freq. swicthing.
 
There are many schematics and many controller chips out there. Just search for "SMPS".

The most important part is that the frequency can be stepped up from the original 60Hz (or DC) to a high frequency which means a far smaller, lighter, cheaper transformer can be used since it makes much more effective use of magnetic materials as well as the capacitors. It won't hum in the audible range. The output ripple and EM leakage is also outside the audible range so you won't hear any of the power supply in an audio output.
 
Someone Electro said:
Its an powersuply that feeds an transformer of coil at an realy high freqency To step up or step down the voltage.They are light and eficent.They also can suply higer powers becose of there high eficency(there is les heat that wod limit its output)

i think computer power supplies use this method
 
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