gate driver hbridge to control dc motor

Discussion in 'Power Electronics' started by mah, Oct 11, 2016.

  1. mah

    Thread Starter Active Member

    Mar 15, 2010
    276
    2
    I do speed control on dc motor using PWM , I want to control it using two output from the controller. one output for pwm and the other for direction control.
    I did this circuit in proteus but the motor speed is very low at high frequencies, I don't know what is the problem
     
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  2. wayneh

    Expert

    Sep 9, 2010
    12,094
    3,033
    Take a look at the switching waveform. You're probably getting incomplete switching at high frequency. You should specify what you mean by "high". What frequency is OK and when does it fall off?
     
  3. mah

    Thread Starter Active Member

    Mar 15, 2010
    276
    2
    frequencies below 1k hz is ok but higher than that slow down the motor in simulation.
    I need it to work at 20khz ,24 Vcc
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,094
    3,033
    And the waveform?
     
  5. mah

    Thread Starter Active Member

    Mar 15, 2010
    276
    2
    the output of ir2112 isnot pulses it is constant. but it gives pulses( max amplitude 5 volt) on th Hi ouput when I increase Vc pin 3 to 20 volt
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,515
    2,369
    Normally the bottom Mosfet switches on for the whole width time, the upper is switching the required width.
    Max.
     
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