Abstract
This paper proposes a generic control scheme for automatic resonant frequency tracking (ARFT) in resonant converters. The plant is modeled based on realistic ramp variation of resonant frequency due to slowly varying environmental conditions. The proposed ARFT scheme monitors the gain relationship between an exclusive electrical variable pair to detect frequency drift. An analytical approach is presented to select the most suitable variable pair for gain comparison. The effects of tank parameter variation and circuit nonidealities on the gain relationship of the chosen variable pair have been analyzed. An online correction mechanism is proposed to nullify the influence of load variation on the proposed technique. Second-order generalized integrator-based low-cost analog realization of the proposed strategy is detailed. Analytical predictions are experimentally validated by applying the control scheme to a parallel $LLC$ tank-based resonant dc–dc converter.
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