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
    2,939
    489
    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
    2,939
    489
    Connecting the sources is an absolute MUST.

    Do you have an oscilloscope?

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

    New Member

    Sep 27, 2017
    2
    0
    Okay so there are a few basic mistakes in the circuit. I know the post is old but it may help anyone searching over internet with similar issues. There must be a 10k-20k ohms gate-to-source resistor ( Generally known as Pull down resistor ). You should use a gate gate resistor of around 20 ohms. Moreover, the IR2112 is based on bootstrap topology which has many technical complications, you may switch to isolated dcdc based gate driver topology to make it simple for you. I had a similar project and i switched to isolated gate driver topology. I used a gate driver module of cree CGD15FB45P1 but it was really expensive. later i switched to GDA-2A6S1 which had short circuit protection and was less expensive. Hope that helps.
     
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