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about single-phase PWM Rectifier

user3588080
Intellectual 420 points

Will someone uses a single-phase PWM Rectifier TMS320F28XX done it? I will open loop SPWM added to the four mosFET, but the input current is the same as the diode is a pulse waveform, and the first 1/4 mos very hot, I ask what it might be？

  • 0
    Guru 192875 points
    Hi,

    I hope the MOSFET is not damaged. Can you check its health?

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    Intellectual 420 points
    They are not damaged, and the circuit in the inverter state is normal, why work not normal in rectifying the state even if it is open loop
  • 0 in reply to user3588080
    Guru 27285 points

    user3588080 said:
    They are not damaged,

     Which voltage are you using in this circuits?

     Why two inductor are used in a so strange connection?

    What about scope of L1? Why use series inductance to a capacitor in parallel to a bigger one? This is a nonsense why?

    user3588080 said:
    and the circuit in the inverter state is normal,

     What this mean? are you using AC line supply as we can suppose be from L N?

    user3588080 said:
    in rectifying the state even if it is open loop

     And this is also worst, what signify open loop? if you are driving mosfet 1 and 4 ? If a so bad condition is applied then one AC cycle can work charging capacitor, the other half cycle discharging short circuit power line across L2 acting as storage raising the current to dangerous level.

     Remember a MOS when on is a resistor so current flow both way, your circuit need know when use 1-4 bridge drive and when use 2-3 to avoiding shorting DC path to AC.

     Is this a PFC?

     Are you sure about your circuits?

     Where is ac line sensed?

     Are you using a lot of devices, why not use ground referenced dual phase rectifier, two mosfet two inductor more power efficiency and simple sensing of parameters.

     Knowledge and precision are required to made circuit work, solution came only from understanding and communication not from multiple useless posts.