H-Bridge DC motor driver

Discussion in 'The Projects Forum' started by MrNobody, Feb 27, 2007.

  1. MrNobody

    Thread Starter Member

    Sep 5, 2006
    10
    0
    Hey..
    I need help in designing a H bridge motor driver circuit to drive a DC permanent motor.
    The H bride is similar to the attched circuit.
    But instead of using IGBT, I need to use MOSFET.
    The circuit also need to have optocoupler (each connected to the MOSFET).

    The optocoupler will be controlled by a function generator (around 5V).

    The motor specs are:
    Type: dc permanent magnet motor.
    Voltage rating: 180 Volts dc
    Power: 500W

    The supply specs are:
    High voltage, high current (60V, 3A) fixed dc is to power the motor.
    An external low power transformer with primary rated for 230V, and two secondary coils of 12V ratings is available to provide the power required for the gate drive circuit.



    The difficulties I have is I don't how to choose the MOSFET i need to use, don't know how to choose the optocoupler I need to use.
    I read somewhere that I need to use both N-MOSFET (enhanced) and P-MOSFET (enhanced). Why need to use enhanced MOSFET and not depletion MOSFET..? The only thing i know about MOSFET is for N-MOSFET, the source is connected to GND and for P-MOSFET, the drain is connected to GND.

    I really need help.. Can somebody please help me.. Thanks..
     
  2. MrNobody

    Thread Starter Member

    Sep 5, 2006
    10
    0
    Sorry, the circuit above is not viewable..
    Below is the circuit that can be viewed..
    Thanks..
     
  3. rwmoekoe

    Active Member

    Mar 1, 2007
    172
    0
    why does it have to be mosfets?
    i think mosfets with that high of working voltage is difficult to find.
    igbt's is ok with and usually designed for high voltage, don't you think so?

    thx.
     
  4. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    "High voltage" is typically far above the 180V discussed in this thread. There are plenty of mosfets on the market able to handle this task, rwmoekoe. Some of them are less than half a USD each.


    MrNobody, have a gander through Eugene Blanchard's notes: http://www.cadvision.com/blanchas/hexfet/
     
  5. rwmoekoe

    Active Member

    Mar 1, 2007
    172
    0
    i see, thanks thingmaker3.
    thx too for the link :)

    sure mr. nobody can answer his question by reading that page.
     
  6. sunil_r_sp

    Member

    Feb 18, 2007
    13
    0
  7. h.d

    Active Member

    Oct 22, 2007
    150
    0
    hi,
    am new member here
    i have dc-motor 12V 20A
    i want to designe the drive circuit for it and be variable speed using pwm by PIC
    for the high current i should use IGBT or MOSFETS
    am need help for what should i use.?
     
  8. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    h.d,
    You should start your own thread. Posting a new question to someone else's thread is known as "hijacking" - even though it is similar in nature.
     
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