🚀 go-pugleaf

 > Subject: DC to AC help
 > Organization: Malaspina College
 > Message-ID: <1992Sep28.095640.858@mala.bc.ca>
 > Date: 28 Sep 92 09:56:40 -0700

 > If I have a DC current how can I go back to an AC current???  This has
 > confused me greatly.  Can anyone help?
 >                        chris.

Chris,

I'm new to the echo, and hence may not be up on what yer level of expertese (sp?) is. However the basic idea with DC -> AC conversion is you need to turn the DC on and off, and work with the rough AC produced to form a wave that's acceptable.

For example you could stick a MOSFET in series with your DC load and switch it on and off, you'de get AC that way. (very very crude)

If you're powering an inductive (say a motor) or capacitive load and want a more smooth AC. You can use the reactive components of the load to smooth out a pulsating DC. You would do this with Pulse Width Modulation. First figure out the value of the sine wave at regular intervals, then generate a square-wave with a duty-cycle respective to that of the value for that time slice, and output this to a electronic switch. output that in turn to your load (you'll need to generate the othe half of the sine as we


ll but hey..)

If yer into analog stuffage, the output from a sine wave oscillator is AC, and the power you run it with is DC. Hence in a loose sense you have a DC to AC converter.

If you need gobs of power, use something switching for sure, unless you have heat-sinks the size of a Honda.

-Jason

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 * Origin: C.A. - FrontDoor (1:348/207)