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Control Methods of LLC Converters

by Christophe Basso - Future Electronics Targeting practicing engineers and graduating students, this seminar starts with a review of soft-switching definitions and explains how a typical LLC converter operates. The description of the direct-frequency control opens the discussion on control methods and more recent approaches are covered such as charge- and current-mode controls. Control-to-output transfer functions are plotted and the responses of each approach are compared. Simulation is used throughout the examples to illustrate typical operating waveforms but also extract the ac response from a switching circuit. Several examples of loop stabilization are covered in continuous- and discrete-time-domains. Using mathematical analysis and SIMPLIS, the author maintains a permanent link between theory and market reality. Several working design examples are used to apply the techniques described in the presentation. Balancing analytical aspects and real case examples, the seminar targets an audience with an intermediate background in the presented subject.