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Anonymous Poster

Power Supply

05/06/2009 12:10 AM

How to make a power supply from AC480V down to AC220V? (not transformer)

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#1

Re: Engineer

05/06/2009 8:04 AM

Why would you ever avoid taking the least expensive route? The parameters suggest that you wish to maintain a 60Hz frequency, so it seems pointless to consider a non-transformer approach.

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#2

Re: Engineer

05/06/2009 11:59 AM

Of course you can never rule out an homework question. Since you always have a way- but no more hints, since the question of not transformer for AC makes it as clear a candidate for homework as possible.

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#3
In reply to #2

Re: Engineer

05/07/2009 8:51 AM

Hello SB,

I considered that this was potentially a homework question but it seemed a little too vague to be question designed by an instructor. And while I agree that CR4 is not to be used for homework, it does seem to offer some interesting and unexpected answers to real problems, especially for those new to a particular field of study.

But for general questions, it seems appropriate to use general answers, links to search engines, or Wikipedia, or to answer a question with another question.

So, be a good sport and toss out a silly suggestion if you like. You never know what spark of brilliance might be triggered from thinking outside the box for a question like this. Personally, I like the idea of a motor-generator set to convert the electrical energy into kinetic and back into electrical energy. But considering all of the coils in the motor, it could be counted as a rotating transformer and thereby be disqualified.

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A great troubleshooting tip...."When you eliminate the impossible, whatever remains, however improbable, must be the truth." Sir Arthur Conan Doyle
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#4

Re: Power Supply

05/07/2009 5:56 PM

A simple voltage divider network using two capacitors (or if you are really desperate. two very LARGE wattage resistors). Don't forget the inrush-limiting resistor when using capacitors as a voltage divider network, least you let the light and smoke out of the capacitors.

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#5

Re: Power Supply

05/09/2009 10:46 PM

Can you provide more details?

What about a nice Triac circuit?

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Anonymous Poster
#6

Re: Power Supply

05/15/2009 6:33 AM

If the source is 480V 3 phase then you can connect phase A to your right hand, phase C to your left hand and phase B to your nose.

Apply 480VAC power.

Your left and right foot should then produce a 220VAC single phase with your right foot being H and your right foot being N.

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Anonymous Poster (1); jack of all trades (1); kudukdweller9 (1); NotUrOrdinaryJoe (2); sb (1)

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