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UCC28251: DC/DC Push-Pull Converter Design for an Inverter (UPS)

Nafi Can Ereli
Prodigy 75 points
Part Number: UCC28251
Other Parts Discussed in Thread: UCC28951, UCC28950, UCC2808A-2, LM25037

Tool/software:

Hello,

I am trying to design a 1 kW DC/DC converter whose output will be used for a sinusoidal pwm full-bridge inverter.

My specs for the converter stage:

  • Input Voltage: 24 V DC (2 series lead-acid battery each is 9Ah)
  • Output Voltage: 400 V DC
  • Output Current: 2.5 A max.
  • Switching frequency (each channel): 100 kHz
  • Output Rectification stage is going to be full-bridge rectification.

For this kind of design, I need to choose a controller such as UCC28251. But, I am not sure if this IC will be able to meet those requirements. Can you please confirm?

If it cannot, can you please advise me another IC that can handle it.

Thanks in advance

Sincerely

Can

  • 0
    TI__Guru 57825 points

    Hi,

    For 400Vin, and high power like 1kW, usually UCC28950 or UCC28951 is used which devices have master slave features so you can use two such devices to make 2x 500W to facilitate this high power design.

  • 0 in reply to Hong Huang
    Prodigy 75 points

    Mr. Huang,

    First of all, thank you so much for your reply.

    My input is 24Vin, not 400Vin

    I want to realize this circuit by utilizing push-pull topology. UCC28950/1 is a PSFB as you know.

    Therefore, I am still waiting for recommendation of a controller for push-pull topology. If you have any, I would love to be informed. Otherwise, you can close the thread.

    Sincerely,

    Can

  • 0 in reply to Nafi Can Ereli
    TI__Guru 57825 points

    Hi,

    Push-pull, UCC2808A-2, or LM25037. 24Vin, 1kW is too high to use a push-pull but it is ok to use if you want. UCC28251 is ok to use too with same concerns.

    UCC28950 or UCC28951 can be placed on the secondary-side which is another feature to deal with 1kW 400Vo.

    But it is your option to use which and to deal possible challenges. 

  • 0 in reply to Hong Huang
    Prodigy 75 points

    Mr. Huang,

    Thank you so much for your suggestions.

    I want to ask you one more thing that did you suggest using UCC28950/1 on the secondary-side to obtain AC voltage?

    You may find the question weird, sorry for lack of knowledge.

    Thanks again for your help.

    Can

  • 0 in reply to Nafi Can Ereli
    TI__Guru 57825 points

    Hi,

    It is not good directly to use for secondary side AC - I thought 24V to an intermediate high voltage in DC first then DC to AC. I was focusing on max power 1kW not easy to achieve from a single phase PWM converter like push pull as 1kW at 24Vin at primary side with single phase high current very challenging.

    I have provided the push pull devices part numbers and my suggestions and concerns so you can decide how to move.