High Voltage and High Current Load Switch/Relay

Discussion in 'The Projects Forum' started by virtualeast, Feb 12, 2009.

  1. virtualeast

    Thread Starter New Member

    Jan 13, 2009
    Trying to delete thread..
    Last edited: Jan 11, 2010
  2. Bernard


    Aug 7, 2008
    Here is just a thought, bare bones at that. When triggered, top SCR charges cap untill current drops below holding current . Bottom SCR dumps charge on demand . May add small inductance to control initial discharge rate. Control SCR gate with pulse transformers or optical couplers .
  3. mik3

    Senior Member

    Feb 4, 2008
    Just use a power MOS for each capacitor driven by PWM (high side drive) as to control the current through it.

    Note that the charging current to the capacitor will not be constant but it will decrease as the capacitor charges because your power supply voltage is constant.

    Then use another power MOS for each capacitor as to deliver the charge to the lamp.

    Also, with the voltage tripler you won't be able to obtain high currents. Better to use a step up transformer followed by a rectifier.
  4. virtualeast

    Thread Starter New Member

    Jan 13, 2009
    Thanks for your help MIK3.