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Poor Man's 24 Volt Power Supply

Discussion in 'Motor actuators and drivers' started by EvanF, Feb 22, 2008.

  1. EvanF

    EvanF Member

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    I've noticed a growing interest towards 24 volt actuators and the subsequent supply of power for them. I personally use 4x 12V SLA batteries paralleled and in series with a dedicated 24V regulated trickle charger that can crank out 6amps itself if required. This setup gives me more than enough V/A to power 3 actuators.

    However I also do have a backup bench power supply which is the topic of this post and may be of interest to questors of alternative power supplies.

    I bought this on Trademe for $30 and after a quick search yesterday saw a number on EBAY at very reasonable prices. So yes they are available and just waiting for people to pick them up cheap. It is an untapped goldmine for the likes of us.

    It is an AC 24V isolating transformer used for outside lighting. It is rated at .5KVA which works out to be around 24V at 20Amps! After throwing on a bridge rectifier the DC reads 32volts RMS. Perfect for running through an H-Bridge as long as you don't have a common ground with whichever micro controller you choose to run with.
    I had some 6amp diodes handy so instead of just buying a $10 bridge rectifier I couldn't help myself and had to make my bridge rectifier board look bullet proof!. Notice the thick tracks under the vero :eek:

    Happy hunting!

    poor-mans-power-supply-01.JPG poor-mans-power-supply-02.JPG poor-mans-power-supply-03.JPG poor-mans-power-supply-04.JPG
    EvanF, Feb 22, 2008
    #1
  2. tronicgr

    tronicgr

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    Hi EvanF

    Great alternative for 24v power source! Do you have any schematic of the vero board bridge rectifier circuit?

    Regards, Thanos
    tronicgr, Feb 22, 2008
    #2
  3. EvanF

    EvanF Member

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    Hi Thanos, this is what I worked to, with my diode wiring conversion in pen above the schematic diagram. The highest value elect cap I had was 1000MFD so that's what I used! The resistor is just to bleed the cap of stored volts when it is powered off.
    bridge-rectifier-schematic.JPG

    EvanF
    EvanF, Feb 22, 2008
    #3