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TMS320F280049: how to do reactive power control for solt start

Strong ZHANG
Expert 4660 points

Part Number: TMS320F280049

Hi Expert,

For soft start of TTPL PFC control, if customer want to do reactive power control, which phase angle between current and voltage is not 0, can they still use below soft start method? 

  • 0
    TI__Expert 5715 points

    Hello Zhang

    This method may not be used. Above method is based on the fact that the 0 crossing of the current and voltage occurs at almost the same instant. So we just the take the 0 voltage crossing and implement above method. At that instant, the value of current is almost 0. When you implement reactive power control, based  on the amount of reactive power, there will be a phase difference between voltage and the current. So at the 0 crossing of the voltage there will be some amount of current flowing. Now when implementing switching scheme, you need to provide a path for this current to have minimum transient. 

    Thanks

    Amir