H-bridge driver

Discussion in 'The Projects Forum' started by ffb.boy, Oct 22, 2013.

  1. ffb.boy

    Thread Starter New Member

    Oct 22, 2013
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    Hi,
    I would like to build a H-bridge driver for my motors.

    Here is the motors data
    The first one
    Nominal voltage 48V
    Nominal current 1.4A (max continous current)
    Starting current 7.5A
    Terminal resistance 6.46 Ohms
    Terminal inductance 1.7mH

    The second one
    Supply Voltage (V) 24
    Current @ Cont. Torque (A) 4.4
    Continuous Output Power (W) 75
    No Load Current (A) 0.26
    Peak Current (A) 29
    Terminal Resistance (Ohms) 0.84
    Inductance (mH) 1.4

    The power is 24V for twice .

    There is many ways to make an h-bridge , 2 N and 2P or 4 N mosfet.
    I don't know what is the best way.
    Could you me to make a choice ?
    Thanks you
     
  2. ronv

    AAC Fanatic!

    Nov 12, 2008
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    If the voltage is low (say 12 volts) it is often easier to use N & PFETS. But in your case the voltages are higher than the gate to source breakdown voltage so I would say use NFETs. Then the problem is how to turn on the top FETs. I like the HIP4080 or 4081 driver.
    Someone posted a nice driver that is complete here a few days ago made by Inferion I think. If you like I can go back and look for it.
     
  3. ronv

    AAC Fanatic!

    Nov 12, 2008
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  4. ffb.boy

    Thread Starter New Member

    Oct 22, 2013
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    Infineon you mean ...
    Is it this link : here you speak about ?

    I'm looking for so-8 package , low rds and no heatsink needed.
     
  5. ffb.boy

    Thread Starter New Member

    Oct 22, 2013
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    I've look around the web and I think I made it with 2 IR2104 and 4 N channels mosfet
     
  6. ronv

    AAC Fanatic!

    Nov 12, 2008
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    The problem with the bootstrap drivers is that you can't run the motor at 100% on. If you only want 90% of your motors power that would work, otherwise you need a driver with a charge pump like the one above or take a look at the HIP4080 or 4081.
     
  7. ffb.boy

    Thread Starter New Member

    Oct 22, 2013
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    I would like to use the motor at full power so I will look at the HIP4080 et 4081 .
    For the mosfet I tought to use some IRF7862Pb, I'm looking for recent mosfet .
    What do you think about this ?
    Thanks you.
     
  8. ronv

    AAC Fanatic!

    Nov 12, 2008
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  9. ffb.boy

    Thread Starter New Member

    Oct 22, 2013
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    Here is the schema I tought , what do you think about it
    [​IMG]

    On the net I've found C1 and C3 at 330nF
    For D2 D3 D6 D7 I would like to use CD214A-F150 (Fast response rectifiers)
    I take the NFET from your previous advice.
    My frequency will be at 50Khz and I would like to add a filter for the motor noise. Is it possible to add something like a RC or something better.
    For the current sensing I would like to use the MAX4173 and an AOP in voltage followers.
     
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