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08-30-2012, 01:55 AM
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Switching power supply....question
Can someone advice if this power supply that powers an alarm clock radio here in USA, can also be used in a country where there is 220v a.c.? It says a.c. Input is 100-220v....wonder why. Does it mean I can connect this to a 220v supply without any issues? Pls advice, kris 
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08-30-2012, 02:33 AM
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#2 | ||
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Yes that is what it means.
What are you powering with it? 4.5v output is pretty low.... Mike |
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08-30-2012, 03:38 AM
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#3 | ||
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Re: Switching power supply....question
Here it is, has 2 AA battery backup too. So far its been great. http://www.amazon.com/gp/aw/d/B000VUM79G -- Kris |
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08-30-2012, 03:39 AM
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It can handle any AC voltage between 100 and 240 volts.
A switching power supply, sort of turns on and brings a capacitor up to the correct voltage (4.5 on yours) then switches off. it then switches on and off to keep the correct voltage output. |
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Dave R, Proud PGR rider.
When you have flying skills like mine,  You become a master at repair. 
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08-30-2012, 04:08 AM
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#5 | ||
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Re:
wonder how it can take a big range of a/c input ie 90-220v? Thx all -- Kris |
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08-30-2012, 06:20 AM
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#6 | ||
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2013 President of PSSF
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I believe it switches the rectified AC, now a pulsating DC.
It senses the output voltage but switches the input to the cap. on & off very fast. I really don't think it cares much about excess voltage it just doesn't use it. It's been a while since I studied the types of power supplies that are out there. Wikipedia can probably explain it better. |
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Dave R, Proud PGR rider.
When you have flying skills like mine, You become a master at repair.
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08-30-2012, 06:30 AM
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#7 | ||
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Originally Posted by Wildflyer
Actually they don't really work like that. There are are semiconductors called FET's that switch the input voltage on and off very rapidly. The 'on' and 'off' periods are adjusted so that the average voltage between all the on's and off's is the desired output voltage. This is known as pulse width modulation (PWM)
You now have a square wave pulsing output where the peaks are the input voltage, the troughs are zero and the average is the desired output. This is fed into capacitors which act like dampers to smooth out all the peaks and trough and deliver a smooth steady output at the desired voltage. Steve, |
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08-30-2012, 05:18 PM
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#8 | ||
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2013 President of PSSF
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OK
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Dave R, Proud PGR rider.
When you have flying skills like mine, You become a master at repair.
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