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Automated variac operation 0-220Vac

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missk

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Hi

I 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?
 

a different approach for this kind of device.
a big transformer with multiple outputs 1v 2v 4v etc
and a controller that switches relays depending on the desired voltage
see the pdf joined, text is in german, but schematic is universal
regards,
 

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  • WSN_7002_KM.pdf
    1.6 MB · Views: 99

Depending on your power requirements, you could use drive a D/A from your micro generating a variable peak AC waveform. Follow that with a power amplifier which drives (AC coupled) a step up transformer. No (electro) mechanical devices are needed. You could make your own power amp using something like the LM12, but you will be restricted to tens of mA when you step it up to 240V. You would probably need a commercially available power op amp for any significant power output.
 
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    missk

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hi guys, thanks for the suggestions.

Antedeluvian I like your idea alot. Working on it.
 

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