Please need help for sine wave inverter.

Discussion in 'The Projects Forum' started by Muzamil Farid, Nov 24, 2015.

  1. Muzamil Farid

    Thread Starter New Member

    Nov 24, 2015
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    2
    I am working on sine wave inverter and i really need serious help,It will be heavily appreciated, I am controlling H-bridge(High side P channel,Low side N-channel) via SPWM signals and 50HZ Square Pulses.The first leg controlled by SPWM and other leg controlled by 50HZ square waves, I am confused about the functioning of P-channel Mosfets, How are they conducting?.What is the criteria of conduction? The source of high side p mosfets is 12V dc to be converted to 220V,50Hz sine wave,My confusion is that output distorted Sine wave will have a peak of 12V?. After implementing on proteus I am getting 0v between two outputs of H-bridge.
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,980
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    So am i confused, your using square waves making a sine wave, lets have a circuit diagram please....
     
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  3. Muzamil Farid

    Thread Starter New Member

    Nov 24, 2015
    4
    2
    Thanks for the reply, Actually i surveyed on the internet and found the designs using 50HZ Sqaure waves on the right leg of bridge, I am obtaining Sine waves from SPWM control signals,The only explanation i could find of using 50HZ Sqaure wave was that it controls polarity and PWM signal controls amplitude of output wave,I
     
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  4. alfacliff

    Well-Known Member

    Dec 13, 2013
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    yes the output will be 12 volt square aves. a transformer is used to step up the voltage to the out put you want.
     
  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    Is L1 a transformer?, if so the secondary winding is not drawn, that will step up the voltage to 220V ac, or whatever its designed to give out, dont see the point of C1 .
     
  6. Muzamil Farid

    Thread Starter New Member

    Nov 24, 2015
    4
    2
    L1 is the inductor used with C1 as low pass filter to remove unwabted harmonics from output
     
  7. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    L1 is in the wrong place, it should be in series with the positive supply.
     
  8. Muzamil Farid

    Thread Starter New Member

    Nov 24, 2015
    4
    2
    I dont understand where in series, from positive supply to capacitor and then measure output at node of capacitor?
     
    alzoobery2001 likes this.
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