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Type: Posts; User: ratheeshvaram@yahoo.com

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  1. Closed: Re: What is the reason for MOSFET burning?

    atom,
    I connected two bulbs as u drawn (both are 5W 230V), and one 5W bulb across the load instead of 1k resistor.
    -I connected the multimeter across load
    -CRO from Q3, Q5 drain to ground
    when...
  2. Closed: Re: PCB layout design for pic programmer

    there is nothing wrong, i can sea in ur pcb...
    it depends on how you process pcb...if it is by simple method it will be defficult.. for that u need to increase the line width, min. distance betn....
  3. Closed: Re: What is the reason for MOSFET burning?

    i connected 2 5w bulb in series with Mvolt...
    then it blinks strongly...

    after repeating the testing with defferent values of CB and Rgs.. I got many mistakes.. but atlast when I removed the CRO...
  4. Closed: Re: RS232 and USB interfacing wit at89c51

    if the cable u mensioned here contains a converter circuit inside in it, u can use it as normal .....
  5. Closed: Re: What is the reason for MOSFET burning?

    ok atom,
    i will try...

    - - - Updated - - -



    ok bawa,
    thank u. and i will make all these changes and inform...
  6. Closed: Re: What is the reason for MOSFET burning?

    -no i didnt connect LC filter
    i had checked h bridge with 400v dc, and that time total supply shorts anf mofet burns
    - i am using unipolar independeny scheme..
    i.e. for 10 ms 30khz applied is...
  7. Closed: Re: What is the reason for MOSFET burning?

    dead time using program...

    first it was nearly 100us and because of this program.. I changed to 1ms... (to check is it the problem of dead time..)
  8. Closed: Re: What is the reason for MOSFET burning?

    ok,
    But I make all 4 MOSFET IRF830 (same as in circuit), cecked DC-DC converter (getting 400V, with LED as load) , checked DC-AC converter using 12VDC, getting an AC without filtering... and when...
  9. Closed: Re: 500VA sine wave inverter , problem in HBridge and filter designing

    hi bawa,
    can u please recognize my circuit problem..... in https://www.edaboard.com/thread302697.html
  10. [SOLVED]Closed: Re: Problem in Pic16f870 with uart.can anyone help me...

    the third step is s++ or *s++ ?
  11. Closed: Re: RS232 and USB interfacing wit at89c51

    hai,
    i think u want to interface your microcontroller with ur PC, but your PC doesn't have a COM port (RS232), is that right?
    if so, U need to add a bridge between PC and your microcontroller...
  12. [SOLVED]Closed: Re: Problem in Pic16f870 with uart.can anyone help me...

    hai,
    what proplem? u didnt specify....
    - if u are getting garbage values, .... s is pointer, so TXREG=s will load the address,
    so change to, TXREG=*s am I right?

    Ratheesh
  13. Closed: Re: H_Bridge controlled by two signals

    jean, your driver out is correct, if u are not getting across load, there may be some thing wrong in driver circuit..
    -please show the full circuit
    -and wave form across load...
  14. Closed: Re: H_Bridge controlled by two signals

    I cannot understand why u said, wrong signal.. in the output of driver for high side u are getting 50hz and low side u are getting SPWM (50 hz with carrieer 16Khz) am I right...?, also in the next...
  15. Closed: Re: H_Bridge controlled by two signals

    jean,
    In my circuit I tied microcontroller gnd, driver gnd and Mosfet voltage together, is ther any fault..
    what about your connection... in your attached file I can only see the bitmap...
  16. Closed: Re: What is the reason for MOSFET burning?

    Yes, that also tied up with Mvolt GND...

    then what change should I make, please explain.....
  17. Closed: Re: H_Bridge controlled by two signals

    no of sine table is 32,

    SET_FREQ=65536/32/5=409.6,
    where 65536 is max of integet
    32 is no. of sine table
    5 is after each 5 carrier pulse cycle, the sine table pointer incriments, to get 312.5us...
  18. Closed: Re: Need help in inverter design

    this is to test our product, which is using transformer less power supply
    if I did'nt tie up Mvolt ground with +12V, the gnd of ir2113 and MOSFET will become different, no?, then MOSFET will switch...
  19. Closed: Re: H_Bridge controlled by two signals

    jean,
    here tahmid devide the sine wave into total 64 devisions,
    so in one half cycle there will be 32 devision.
    so we need to provide sufficient voltages corresponds to the sine wave using...
  20. Closed: Re: Need help in inverter design

    kabeer,
    I am using two microcontrollers, one for DC-DC and other for DC-AC,
    I doubt, in the high side the switching freq is 30KHz, but the bootstrap capacitor I chose from Tahmids blog (in...
  21. Closed: Re: H_Bridge controlled by two signals

    hai jean.
    did u get any solution for ur problem, I too facing similar problem explained below.. please help
    I am designing a variable inverter, output- 100V-300V, (40Hz-70Hz) 10W and input-12V,1A....
  22. Closed: Re: Need help in inverter design

    kabeer,
    still the problem is there, DC-DC converter is working indipendent, DC-AC converter working with 12V.. but when connecting DC-DC output to DC AC converter as Mosfet voltage two...
  23. Closed: Re: Need help in inverter design

    here is my circuit......
  24. Closed: Re: Need help in inverter design

    in my company getting desired components will take much time. so i tried to adjust with existing components.
  25. Closed: Re: Need help in inverter design

    thank you, kabeer and amayilsami,
    I understood the need of posting circuit, I am trying to get permision. I had two doubts,
    -in H bridge circuit I had used DFP740 (High sides) and IRF 830 (Low...
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