IR2110 Mosfet/IGBT Gate Driver - Three phase inverter for BLDC motor - help needed

Discussion in 'The Projects Forum' started by vishnu108, Feb 2, 2013.

  1. vishnu108

    Thread Starter New Member

    Jan 31, 2013
    2
    0
    Friends,

    my project: speed control of BLDC motor (square wave BLDC)...

    my motor(load) specifications are: 24VDC(for inverter) 0.25HP 3000RPM and by calculations it shows current rating will be 8Amp
    so the inverter should be designed for this specifications...

    with the help of datasheet i designed the mosfet gate driver circuit, i have attached my circuit diagram here...

    i have soldered this circuit in board....

    for gate pulses, i used arm processor, 120 deg mode, given in correct sequence...

    when i checked this circuit with just resistance load 1k ohm, the inverter output was step wave, only 10V peak to peak,
    whatever input given to inverter, i got only 10V not exceeding it..

    when i connected motor to this circuit, motor started at very less speed, and after few seconds, mosfet got burnt..


    i checked this forum for the circuit, i found many corrections in my circuit....

    so, i attached what i did in my circuit

    friends, please guide me in solving my problem...
     
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
    2,936
    488
    The sources of the transistors must be connected to their drivers.
    Have a look at page 1 of the datasheet for reference. That would be pin 2 for the lower FETs and pin 5 for the upper FETs.
     
  3. vishnu108

    Thread Starter New Member

    Jan 31, 2013
    2
    0
    thanks for the response friend..

    i even tried it.. in that case, the output which comes now also was not coming...
     
  4. praondevou

    AAC Fanatic!

    Jul 9, 2011
    2,936
    488
    Connecting the sources is an absolute MUST.

    Do you have an oscilloscope?

    Post pictures of your layout and the signals measured with the scope.
     
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