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High power buck PFC solution

Satoshi
Guru 19645 points
Other Parts Discussed in Thread: UCC29910A

If there match solution for 2kW~3kW buck PFC on TI device, please let me know.

【Additional information】

・Input: 440Vac

・Output: 270V / 2kW~3kW

・Customer is aiming at PF:0.95

・60Hz

Best regards,

Satoshi

  • 0
    TI__Mastermind 25590 points

    Satoshi,

    From another thread:

    "The only Buck PFC controller in the TI portfolio is the UCC29910A. It was developed to produce a 84V output from universal line input of 85V to 264V and it is not possible to change the input/output RATIO. If you use this device you will have to scale the output accordingly and I estimate that Vo would be about 150V. This could then be fed into the LLC second stage.

    Be aware that the BUCK PFC works well but has the disadvantage of being more susceptible to input surges (lightening strikes) than the more usual Flyback.

    A 'normal' boost PFC will have an output voltage above 650V if you wish to operate it at 460Vac in."

    The datasheet says a power factor of >0.9 so I'll have to wait for someone else to comment about reaching 0.95.

    -Sam

  • 0 in reply to Samuel Jaffe
    TI__Mastermind 25570 points

    Hello Satoshi

    The Buck PFC can get 0.95 PF but not at low line where the 'dead time' - the time where the instantaneous input voltage is less then the output voltage - is large. So, it depends on the input voltage range you are working with.

    Take a look at the article at https://www.ti.com/seclit/ml/slup264/slup264.pdf    for more details.

    Regards

    Colin