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Re: [Electronics_101] automatic powersupply activation

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  • Stefan Trethan
    You need to apply a voltage to the output, an as soon as a certain current flows you switch on the supply. The relais is a good idea but only if the output of
    Message 1 of 2 , Apr 30 11:24 PM
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      You need to apply a voltage to the output, an as soon as a certain current
      flows you switch
      on the supply. The relais is a good idea but only if the output of the
      supply has
      a diode in it (otherwise the output cap will charge to 24V.)

      ST

      On Sat, 01 May 2004 06:14:38 -0000, Matt <mattsoft@...> wrote:

      > I would like to put some kind of sensor on a power supply to detect
      > when something's connected to it, and turn itself on. it's the 1000
      > watt one I've talked about on here before. it's output is 12v, but it
      > has a 24v transformer in it to run 2 relays and a soft start circuit.
      > what I was thinking of doing somehow, is take some of the 24v power
      > and put it thru the coil of a small relay and connect it to the
      > output of the power supply, with maybe a 2w resistor in there.
      >
      > I have a microcontroller I could use in the project if needed. some
      > kind of ampmeter connected to the existing wire from the rectifire
      > bridge to the output might work, but it might have to be pretty
      > sensitive. the output ranges from about 2 amps to around 80 amps 12v.
      > I would like it to shut off if it drops below 1 amp or so. any ideas?
      >
      > Matthew Kemmerer
      > Mattsoft.net
      >
      >
      >
      >
      >
      > Yahoo! Groups Links
      >
      >
      >
      >
      >
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