+ Post New Thread
Results 1 to 2 of 2
  1. #1
    Newbie level 1
    Points: 14, Level: 1

    Join Date
    Sep 2017
    Posts
    1
    Helped
    0 / 0
    Points
    14
    Level
    1

    Proteus Ir2112 problem

    Hi all..
    I tried to built half bridge using 2 irf540 mosfets and ir2110 as gate driver, but due to unavailability of ir2110 in proteus so I replaced it with 2112 instead, but the problem is that the HO doesnt respond any input in HIN, and any PWM input would just be ignored. I curious what is the problem with that and I hope you can give me solutions
    Click image for larger version. 

Name:	Capture.JPG 
Views:	1 
Size:	71.6 KB 
ID:	141188

    •   Alt13th September 2017, 03:54

      advertising

        
       

  2. #2
    Super Moderator
    Points: 47,554, Level: 53
    Awards:
    Most Frequent Poster

    Join Date
    Apr 2014
    Posts
    9,719
    Helped
    2344 / 2344
    Points
    47,554
    Level
    53

    Re: Proteus Ir2112 problem

    Hi,

    A mosfet is controlled ON/OFF with it's Vgs.
    Vgs means voltage between gate and source.

    Therefore the driver IC need both these connections: gate and source of the Mosfet.
    But you only connected gate to the driver.
    --> connect mosfet_source to driver_Vs

    This also is urgent for the bootstrap capacitor to be charged.

    ****
    In real word your circuit will destroy itself. The motor is an inductive load, when the Mosfet is being switched OFF this generates high voltage spikes, killing the Mosfet.
    --> use a free wheeling diode across the motor.

    ***
    Dismiss R2. Or make it 100k, if you think you need it.
    ***
    In a half bridge configuration D2 makes no sense.

    Klaus



--[[ ]]--