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LLC Resonant DC-DC converter

Ali zreig
Prodigy 10 points

I would like to thank the TI team for the useful information, advanced devices, and tools that contributed to the completion of many projects and designs, as well as the great support it provides to researchers and designers in many fields.
 
Second, I have some questions that I hope to get clear answers  to help me design my circuit:
 
1-Could I use an LLC Resonant tank with a multilevel inverter as shown in the figure below? Or it is limited to use on half-bridge and full-bridge only.
 
2-If I use it with a multilevel, does it affect the waveform of the output of the inverter?
 
3-What is the output voltage waveform of the resonant tank (VLm)? Is it the same as the waveform of the output voltage of the inverter (Vinv) or different?
 
4-I am facing the problem of determining the proper value of the quality factor (Qe), so that I can find the values of the variables for the resonant tank (Lr, Cr, and Lm). Is there an appropriate way or tools to accurately determine Qe value?


Thanks in advance.

  • 0
    TI__Genius 9790 points

    Ali,

    LLC with TI's analog controller is basically for DCDC conversation, like 400Vdc to 12Vdc/24Vdc/48Vdc. we don't have reference design to show LLC in inverter. 

    In you image, what is the waveform of Vinv?

    Yunsheng 

  • 0 in reply to Yunsheng Qu
    Prodigy 10 points

    Thanks for the response! could you please explain what kind of inverter that u use in the DC-DC converter? and have you used a multilevel inverter?

     please could you help by answer the points in my question?

    This helping will be very appreciated.

    the waveform of [Vinv] five-level 5-L as shown in the picture below.

  • 0 in reply to Ali zreig
    TI__Genius 9790 points

    Ali,

    1. TI's LLC controller is limited to be used only in half bridge or full bridge LLC, so it need Vinv is square waveform form 0 to Vin with very high switching frequency. 

    2. TI has no analog LLC controller can support multilevel inverter, so we cannot answer your question. 

    Yunsheng