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UCC28070: Will it support to boost 80V Battery input to 390V DC?

Sankar Selvakumar
Prodigy 60 points
Part Number: UCC28070
Other Parts Discussed in Thread: UCC28180, UCC28064A, UCC28019A, UCC2817, UCC3817, UCD3138A

Hi,

 Does the UCC28070 supports for both AC as well as DC input?

 I tested it in hardware by giving DC input, I have observed that the output boosted to set value. However, while measuring the voltage across IMO the reverence voltage is varying sinusoidal. Is the UCC28070 is generating sine reference or the captured waveform at IMO for DC input is noise. 

 I haven't tested the input current, I presume that the input current of the battery might also be sinusoidal. 

Please do needful.

Thanks

Regards,

Sankar S

  • 0
    TI__Genius 10655 points

    Hello Sankar and thank you for your interest in the UCC28070.

    The UCC28070 does not support a DC input. 

    The quantized multiplier of the UCC28070 requires that the VINAC input pin detects the zero crossings of the AC input in order to set the correct multiplier level. 

    I would suggest you consider the UCC28180 which will support DC and AC inputs.

    Regards,

    Ray

  • 0 in reply to Ray DiCecco
    Prodigy 60 points

    Hi Ray,

     Thank you for your reply, could you please suggest the similar kind with external synchronization clock for parallel operation.

    Regards,

    Sankar S

  • 0 in reply to Sankar Selvakumar
    TI__Genius 10655 points

    Hi Sankar,

    I'm not sure if you're truly looking for synchronization to an external clock or simply the ability to run two PFCs in parallel.  The UCC28064A may be a good fit if your primary objective is "parallel" (interleaved) operation.  However, being a Transition Mode controller (TM) , the maximum practical power level generally lower than PFCs operating in Continuous Conduction Mode (CCM) .

    If you are more interested in power capability, The UCC28180 or the UCC28019A (both CCM controllers) may be appropriate candidates.

    Do you require synchronization to an eternal source?

    What is your power level?

    Regards,

    Ray

  • 0 in reply to Ray DiCecco
    Prodigy 60 points

    Hi Ray,

    I am truly looking for the external synchronization at the phase difference 90 degree from microcontroller to operate two parallel connected interleaved converter, and it should support for both AC/DC input. The two interleaved converters are operating in parallel for DC (boosting 80V DC to 390V DC) as well as for AC. The reason for two parallel interleaved converters is to improve the capacitor life and to reduce the size for DC input. Also there are several modes of operation with the same hardware configuration. The power rating is 5.5KW hybrid welding application. 

    Thank you..

    Regards,

    Sankar S

  • 0 in reply to Sankar Selvakumar
    TI__Genius 10655 points

    Hi Sankar,

    Yes, unfortunately, the UCC28970 wasn't designed with DC inputs in mind.  Some options that I can think of right now:

    • There have been suggestions of adding "simulated" zero crossing pulses in order to overcome this limitation of the UCC28070 (pulling VINAC below 0.7V for at least 50uS). Unfortunately, I don't have any examples of this, so you'd have to work through this on your own. This should only need to be done when VIN changes by enough to warrant a KFF gain change (and of course during startup any power cycle).
    • The UCC2817/8/UCC3817/8 can be synchronized by an external source (ref: https://www.ti.com/lit/an/slua245/slua245.pdf). However, being single phase only, your magnetics may be prohibitively large at 5.5kW.
    • The UCD3138A (https://www.ti.com/product/UCD3138) is a digital controller that can be configured for PFC with many programmable options.

    I hope this helps,

    Ray

  • 0 in reply to Ray DiCecco
    TI__Genius 10655 points

    Hi Sankar,

    It's been three weeks since our last correspondence. I assume you have no further questions on using the UCC28070 with DC inputs or you found a suitable PFC controller for your application so I will close out this thread..  If you have any further questions, please submit a new E2E question.

    Regards,

    Ray