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TIDA-01606: PFC Mode Only - Unidirectional

Part Number: TIDA-01606
Other Parts Discussed in Thread: TIDM-1000

Good Morning!

I am interested in the PFC section of the TIDA-01606 design. 

I need a 7kW PFC, is it possible to remove the inverter code or is it too cumbersome to try?

Also, can the design be optimized for 7kW? We need the THDi less than 5%

I currently have a PFC design (based on TIDM-1000) working well at 2kW but do not know if its feasible to scale it up to 7kW?

Any thought on using it at higher power?

Thanks in advance for any comments and ideas on how to proceed with a TI design.

Steve

  • Dear Steve,

    thanks for your interest Slight smile. Below, you can find my answers to your questions.

    "I need a 7kW PFC, is it possible to remove the inverter code or is it too cumbersome to try?"

    In both PFC and inverter operation modes the duty cycles need to be calculated from the dq->alpha,beta->123 transformations.

    The transformation from dq -> alpha beta requires an angle value.

    If you want to run your three-phase system you will need these coordinate transformations to be implemented in the code and you need an angle.

    The angle value can be generated internally (inverter) or derived from the grid (PFC operation).

    What you can remove when you run in PFC mode the converter is the function that generates this angle.

    "Also, can the design be optimized for 7kW? We need the THDi less than 5%"

    Yes, the design can be optimized by choosing inductors with lower current saturation. Or for example by having less capacitance in the DC bus (you have less ripple current to withstand). Other things that for sure needs to be optimized are the power devices.

    As shown experimentally from the reference design document, if the converter is used together with the proposed filter, the THD harmonic distortion will be around 2 % at that power. If you keep as reference the same values of L and C, the filter should satisfy your THD requirements.

    I have a suggestion for you. If your aim is to have an AC/DC converter with a power level close to 7 kW we have the sequent reference design based on GaN devices (TIDA 10210).

    I currently have a PFC design (based on TIDM-1000) working well at 2kW but do not know if its feasible to scale it up to 7kW?

    Any thought on using it at higher power?

    I have seen Vienna rectifier working also with power higher than 15kW. The things that you should check in your design in order to get the proper answers of the scaling are the sequent:

    • are inductors and power electronics components (diode and power switches) able to sustain this increment in the switching and conduction losses caused by this big current increment?
    • Is your current sensing ready to welcome this increment in the measured current?
    • RMS current of the DC bus capacitors is another problem.

    Furthermore, I would like to remind you that this design is unidirectional, while the TIDA 10210 and TIDA 1606 are bidirectional.

    I hope I have fully answered your questions.

    Best regards

    Riccardo