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UCC21750: Triggering order either before or after DC link applied to IGBT load

David Nyarko
Expert 1605 points
Part Number: UCC21750

This is a general question regarding which approach is better. With a 2-level, 3 phase inverter with a connected load and the IGBT drivers enabled.

Could i know which of the following 2 options is better. The DC link voltage can be up to around 350V

1) Apply the gate signals to the drivers, wait a second or so, then turn on the DC link voltage to the IGBTs .

OR

2) Apply low level signals to the IGBT drivers ( i.e low gate drives to the IGBTs) then apply the DC link voltage , wait a second or two then start applying the 

correct gate triggering sequence to generate the desired IGBT gate triggering.

Thanks

  • 0
    TI__Genius 10652 points

    Hi,

    We can't give advice on the power on sequence that is dependent on the specific system implementation of your inverter.

    UCC21750 will ensure the gates are pulled low when there is no input/before MCU can give any input to the drivers. If the DC bus voltage is powered before MCU gives signal to the driver, they will keep the gates pulled down until inputs come from MCU.

    Best

    DImitri