LARGE 12 & 14 volt 3 stage charger with a twist....

Discussion in 'General Electronics Chat' started by Dan., Apr 17, 2008.

  1. Dan.

    Thread Starter New Member

    Sep 16, 2007
    Hi All,

    First of all many thanks for your help with the DC-DC regulator previously, it works a treat :D

    Now I have a much larger (and more complex) project.

    I need a 3 stage charger / power supply...

    Charger Specs
    Stage 1 Constant Current @ 50A up to Stage 2 voltage (i did say large...)

    Stage 2 Votages (selectable)
    Voltage 1 - 14.4V or Voltage 2 - 16.8V

    Stage 3 - When current is less than 10A voltages lowers to
    Voltage 1 - 13.62V or Voltage 2 - 15.89V

    I also need the unit to work as a powersupply at the stage 2 voltages (again selectable). Not sure if this could be built into the circuite with a switch to defeat the 3rd stage? or of it would be easier to have a seperate set of connections on the front of the box? Basically I would like as much current as possible when on this setting.

    I have scoured the net looking for circuit diagrams but am unable to find anything suitably large. You may have noticed I'm far from being an electronics guru, but with a suitable diagram and component list I feel confident I can build it.

    Hope you can help!:)