missk Posted August 12, 2011 Report Share Posted August 12, 2011 HiI need to use an Atmega MCU to vary the voltage from 0-220Vac on the primary of a 220V//2000V transformer. I was looking into using a stepper motor to control a variac using a pulley/belt system. But considering that this is only a part of the bigger picture, it seems complex as I need to take into account torque considerations and such.Any chance that somebody may have a better or different idea? Quote Link to comment Share on other sites More sharing options...
Hero999 Posted August 12, 2011 Report Share Posted August 12, 2011 A stepper motor and a belt actually seems like the most simplistic solution.Do you need voltage regulation?If so, an open loop control system won't be good enough. You'll need to adjust the variac to maintain the correct output voltage, as the load changes which will require a servo motor and a voltage measuring transformer. Quote Link to comment Share on other sites More sharing options...
missk Posted August 15, 2011 Author Report Share Posted August 15, 2011 hi heroWhat If I were to use my microcontroller and a digital to analogue converter to create a variable AC waveform. Then I will use a high power op amp, which will feed into a step up transformer to enable me to go from 0-220V ac. Do you think the idea has any merit?Also it eliminates the need for the stepper motor and keeps cost much lower. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted August 15, 2011 Report Share Posted August 15, 2011 Such a solution will require more expensive electronics, be less tolerant of voltage transients and less efficient.I don't think you've thought it through.For a start, you'll need a class D amplfiier otherwise the efficiency will be abysmal. I suggest you do more research. Quote Link to comment Share on other sites More sharing options...
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