120 VAC to DC Power Supply rather than Battery???

15 years 4 months ago #4922631 by bdr
<P style="MARGIN: 0px">Can I use a 120VAC to DC Power Supply instead of batteries?? My robot is stationary rather than mobile.
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<P style="MARGIN: 0px">Any "work-arounds" or other devices that can be added on to the circuit if the RoboteQ controller can't handle this?
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<P style="MARGIN: 0px">Thanks,
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<P style="MARGIN: 0px">BDR

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15 years 4 months ago #4929841 by cosma
<P style="MARGIN: 0px">The problem when using a power supply rather than a battery is the regenerated current during decelleration.
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<P style="MARGIN: 0px">At that time, current wants to flow back in the power supply. A battery will take back that current but a power supply cannot. So the voltage will rise and rise. The controller monitors this voltage and will shut off the MOSFETs at around 43V.
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<P style="MARGIN: 0px">The controller thus should not get damaged. However, your power supply may, depending on its design. Furthermore, when the shut-off occures, there is no longer braking happening.
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<P style="MARGIN: 0px">The way to make it work safely is to decellerate slowly (at near the natural decelleration of the motor &amp; gear assembly's friction).
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<P style="MARGIN: 0px">Another is to add a shunt regulator. This is a low value resistor with a relay and a circuit that activates above a set voltage threshold. See example at <A href=" www.a-m-c.com/download/srst.pdf " target=_blank> www.a-m-c.com/download/srst.pdf
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<P style="MARGIN: 0px">Another yet is to have a small rechargeable battery in parallel with the power supply.
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