AC Sweep Analysis LLC Resonant Converter

Support Communities Switchmode Power Supply AC Sweep Analysis LLC Resonant Converter

This topic contains 3 replies, has 3 voices, and was last updated by  Muhammad YAQOOB 1 year ago.

  • Author
  • #37414

    Andrew Stolber


    I have been trying to perform an AC sweep (open loop) for an LLC resonant converter and I haven’t been able to succeed.
    I have seen the videos of implementing the m-sine AC sweep, however I couldn’t implement them in the case of frequency controlled LLC converters.

    Please, could you provide me some help on how to implement it. Also, it would be very useful if you can make a video with this problem.



  • #37435

    Albert Dunford

    I will put together a video. It should be straightforward. Until then have a play with the attached sim.

    There is an important “trick” to consider, since an “increase” in frequency will correspond with a reduction in gain, in order to get plots that make sense you need to put a “-1” gain block in front of the AC probe. This will then correspond with a negative gain value in the PI controller.

    You must be logged in to view attached files.
  • #37443

    Andrew Stolber

    Hello Albert,

    Thanks for your help!
    I will take a look to that file.

  • #42684

    Muhammad YAQOOB

    Dear Albert,

    Thank you for the sim. files. I have a query regarding closed-loop AC Sweep. In order to get a closed-loop gain and phase plots, should I just have to change the value of MUX to 1? Because doing so, the results seem to be incorrect.

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