digital control from 0 - 40V 10mV step

Discussion in 'General Electronics Chat' started by bug13, Jun 17, 2013.

  1. bug13

    Thread Starter Senior Member

    Feb 13, 2012
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    Hi guys

    I come across this power suppy, GW PSP-405, the user can adjust the output voltage digital from 0 to 40V 10mV step.

    How can they achieve that? that's 4000 steps, do they use a 12bit dac or something else?

    Thanks
     
  2. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
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    169
    Well it's programmable and I would think a multi turn pot or encoder of some sort..
     
  3. GopherT

    AAC Fanatic!

    Nov 23, 2012
    7,490
    6,229
    Yes, 12 bit should do it. Likely an ADC and comparitor charging a large capacitor to maintain a steady power supply.
     
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  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    I think you meant DAC, not ADC.
     
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  5. crutschow

    Expert

    Mar 14, 2008
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    You could use a 12-bit DAC controlled by an up/down counter. A rotary digital quadrature encoder could give up or down pulses to the counter to adjust the voltage in 1-bit steps.
     
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