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PiccoloA HVPSFB_PCMC paralleling

Matthew Dillon
Prodigy 100 points

Hello

Looking into using the HVPSFB_v1.1  Project/Code as the platform for developing a higher power custom design.

Since one of the modes of operation is Peak Current Mode Control (which is what I plan to use) - it should be capable of configuring a parallel mode operation . Any suggestions on best way to implement this ?

 I was considering having a current share bus between the two Piccolo's using the SPI interface ?

Thanks

Matt

  • 0
    TI__Expert 5815 points

    Hello Matthew,

    We are currently looking into your request.   You will follow up with you as soon as we have further information.

    Regards,

    Sem Amesawu

  • 0
    TI__Genius 10820 points

    Hi Matt,

    Yes, PCMC lends itself very nicely for parallel operation. We haven't tried this on the HVPSFB kit. You will probably need to add ORing switches along with an ORing controller like the ones listed here. SPI or I2C can be used to implement current share bus.

    I hope this helps.

    Hrishi

     

  • 0 in reply to Hrishi Nene
    Prodigy 100 points

    Hi Hrishi

    I will not be using Synchronous Rectification on the output stage since supply will operate at 300 to 500 Volts Output.

    Plan to use Diode Full Bridge and should not need any ORing control.

    Do you see any concern with trying to transmit the IREF value via SPI (at 100kHz) between separate Power modules. i.e breaking into assembly code ISR routine ?

    Refer to Figure 20 PCMC Control Flow (TIDU248–May 2014) document for the IREF definition. It did not allow the pasting of my prepared diagram into this message.

    Single Supply Parameters

    Vin = 365 to 390 Volts DC

    Vout = 300 to 500 Volts DC @ 3300 Watts

    Thanks

    Matt

  • 0 in reply to Matthew Dillon
    TI__Genius 10820 points

    Hi Matt,

    Sorry for the delay in responding. I believe the concern would mainly be during line/load transients. If the load dynamics are slow (for example, if the load is a battery), I think this should be fine. If not, you will need to pay close attention to make sure that the two parallel modules use identical Iref in every switching cycle. This will involve being aware of the Iref update timing relative to the control loop and PWM update.

    Hrishi