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UCC28220-Q1: Interleaved boost converter

Akshay Rote
Intellectual 370 points
Part Number: UCC28220-Q1

Hello There,

I am working on Interleaved boost converter for EV application. I require help regarding inductor current ripple. How much exactly current ripple should be allowed in inductor current ? I know most of the time 20% of phase current is taken generally. But can we increase the current ripple to reduce the inductor size? what are the criteria for considering particular values of current ripple ?

Thanks and regards,

Akshay

  • 0
    TI__Mastermind 34465 points

    Hello Akshay,

    The energy stored in the inductor and its physical size is proportional to the L*Ipk^2 product.
    If you reduce the inductance the peak current will increase and this will have push the size upwards.
    Also the increased current ripple will result in a high RMS current which tends to increase the losses.
    The higher ripple will cause more voltage ripple in the output and this negates the effect of interleaving.

    Normally a ripple current of 20% to 30% is used in most applications.
    The inductance value chosen is a compromise between performance and cost and you will need to decide what is best for your design requirements.

    Regards

    John