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Transient protection, snubbers, relays, and electric motors — Parallax Forums

Transient protection, snubbers, relays, and electric motors

Erik FriesenErik Friesen Posts: 1,071
edited 2009-04-28 18:32 in General Discussion
I am doing some current sensing on some 24v electric motors. I am not real clear on how to protect my adc with this, and where place protection.

Any other comments on the suitability of my proposed transient and snubbers on this schematic will be appreciated.

This is what I have so far -

Post Edited (Erik Friesen) : 4/27/2009 5:47:32 PM GMT
pdf
pdf
scematic.pdf
66K

Comments

  • TeslaTesla Posts: 55
    edited 2009-04-28 05:45
    Mabey a filter tuned to what freq you expect to watch and isolate them with op amp.
  • kwinnkwinn Posts: 8,697
    edited 2009-04-28 12:23
    A diode to ground on each line to the ADC between R1, R16, R17 and the ADC. A forward biased silicon diode if the signal is less than 0.7V, or a zener rated slightly higher than the maximum expected voltage if it is over 0.7V.
  • Erik FriesenErik Friesen Posts: 1,071
    edited 2009-04-28 18:32
    Good thinking there kwinn. I had not thought of using diodes. That should work as I won't be seeing more than 200mv.
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