Over Current Sensing/Protection on H Bridge

Discussion in 'The Projects Forum' started by Dead Short, May 28, 2010.

  1. Dead Short

    Thread Starter New Member

    Apr 30, 2010
    4
    0
    Hi

    Am slowly progressing on an H Bridge project but want to add some protection across the MOSFETs by sensing if the devices aren't switching on properly and go into overcurrent.

    Any bright ideas on a trick to sense the Vdrop across the Drain Source after a small time delay once the gate is triggered to sense if the device is gonig to go into melt down mode.

    Am using an IR2110 so will obviously feed back to the shutdown line.

    Many thanks

    DS
     
  2. whale

    Active Member

    Dec 21, 2008
    111
    0
    i think an electrostatic voltage sensing device followed by a trigger circuit which will trigger a high current depletion mode mos device connected in series with the power supply bus will solve the problem.
     
  3. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,740
    759
  4. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    or just use the LMD18200T H-Bridge, it has current sensing built in, and thermal shutdown....:)

    B. Morse
     
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