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Recent content by istian

  1. I

    help about usage of optocoupler

    thanks klausST for this much detailed reply you didn't tell me what if i take my output from collecter instead of emitter?
  2. I

    help about usage of optocoupler

    hi every one i am using optocoupler pic817 for my pwm based h-bridge driving circuit. is it a right choice for this circuit...or should i need to replace it with some other package? one more thing that i want to clear is,currently i am using emiiters output which is being further fed into...
  3. I

    h-bridge inverter using ir2110

    hi every one can i test the above circuit on bread board? i mean is there any chance of getting erronious results? or should i test it on pcb?
  4. I

    problem in H bridge hardware implementation

    yes i have gone through this but can you specifically highlight those parameters which i need to focus while troubleshooting my circuit?
  5. I

    problem in H bridge hardware implementation

    yes barry i have oscilloscope. actually my requirement is to made a variable frequency drive varying frequency from 5hz to 50Hz in order to drive a ac induction motor at variable frequency and speed. what does this mean? that my mosfets are in backward? actually i am also thinking about my...
  6. I

    problem in H bridge hardware implementation

    oppss my fault yes i am using ir2110 in my circuit but in the schematic i have given is ir2112 is being used. actually you know this fact that for proper switching of mosfet gate voltage Vg should be 10-15V more than source voltage.right? but in my case both the voltage i.e Vg and Vs are...
  7. I

    problem in H bridge hardware implementation

    you mean driver ic is not working properly? i have used ir2110 and ir2112 but every time i am facing the same issue
  8. I

    problem in H bridge hardware implementation

    hi every body i am implementing the following circuit on bread board.but unfortunately i am encountering few problems my first problem is V(gs) is zero due to which no current is passing through the mosfet what is the possible reason behind it? i am applying 50hz pwm signal at input of gate...
  9. I

    h-bridgeis not working using MOSFET irf840

    thanks for your reply actually i am trying to generate 50Hz sinewave by applying a pwm signal at gate driver ic.having maximum pwm freq 6.4KHz .can u plz suggest me tha appropriate diode for proper switching ? - - - Updated - - - i appreciate your concern for my question.actually i am...
  10. I

    h-bridgeis not working using MOSFET irf840

    thanks alot for ur reply actually my aim is to drive an ac motor while giving a pwm signal at gate driver IC . but before that i was testing it using a simple dc motor as load u highlighted a very important point regarding load resistance can u plz elaborate it a bit more regards - - -...
  11. I

    h-bridgeis not working using MOSFET irf840

    hi everyone i am trying to drive a H-bridge using high rating mosfet irf840 and gate driver ic ir2112.but this circuit is not working as i am using a dc motor as load. while this circuit works efficiently for MOSFET irf3205S. i am untable troubleshoot. can anyone ple tell me the problem due to...
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