+ Post New Thread
Results 1 to 4 of 4
  1. #1
    Newbie level 3
    Points: 479, Level: 4

    Join Date
    May 2013
    Posts
    4
    Helped
    0 / 0
    Points
    479
    Level
    4

    Mosfet Driver for V/F single phase inverter for driving single AC motor

    Hello
    I am making a V/F inverter as a part of my graduation project to control the speed of a single phase 1 hp AC motor by rectifying the 220 V AC then inverting it again into AC voltage with variable V/f with PWM from AVR ATmega32
    but i have some problems
    1- the output wave gets kinda scrambled when the frequency is over 25 hz but works fine before that
    2- i wonder if i can drive the mosfets with just optocoupler PC817 or co i need mosfet driver like IR2110 or IR2112 and if i have to use the IR2110 can you please show me how to connect it ??
    3- what is the max timer frequency to use in order that the optocoupler can cope up with (i am using timer 0 & 2 with crystal 12MHz and a prescalar of 8) ??
    4- what is the best filter to use for the output (RC or LC ) ??

    Thanks alot in advance

    - - - Updated - - -

    And also do i have to create 4 20V supplies for the Mosfet gate voltages ?? and can i do that with one transformer and 4 bridges ??? or 4 transformers and 4 bridges ??

    •   AltAdvertisment

        
       

  2. #2
    Full Member level 4
    Points: 1,768, Level: 9
    ArNvC's Avatar
    Join Date
    Feb 2013
    Location
    India
    Posts
    201
    Helped
    56 / 56
    Points
    1,768
    Level
    9

    Re: Mosfet Driver for V/F single phase inverter for driving single AC motor

    It is difficult to control a single ph motor using v/f=const. Torque of motor is proportional to V*V. So reducing speed by a small amount reduces the torque to square of it. For wider range successful speed control, use DTC or Vector ctrl.



    •   AltAdvertisment

        
       

  3. #3
    Newbie level 3
    Points: 479, Level: 4

    Join Date
    May 2013
    Posts
    4
    Helped
    0 / 0
    Points
    479
    Level
    4

    Re: Mosfet Driver for V/F single phase inverter for driving single AC motor

    can you recommend where can i learn to do DTC or vector control



    •   AltAdvertisment

        
       

  4. #4
    Full Member level 4
    Points: 1,768, Level: 9
    ArNvC's Avatar
    Join Date
    Feb 2013
    Location
    India
    Posts
    201
    Helped
    56 / 56
    Points
    1,768
    Level
    9

    Re: Mosfet Driver for V/F single phase inverter for driving single AC motor

    You can get the book Modern Power Electronics and AC Drives: Bimal K. Bose. If you want to learn while simulating, go for MATLAB/Simulink demos.



--[[ ]]--