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Digital Gain-Scheduled Control of a High-Frequency Parallel Resonant DC-DC Converter

Fig. 1. Achieved improvement with gain-scheduled design.
This paper discusses the nonresonant-coupled parallel resonant converter and presents the design and simulation of a reference classical analog controller. Based on the strong relationship observed between low-frequency converter gain and the operating point, a band-limited gain-scheduled digital controller is proposed, designed, and simulated, showing an improvement of 5:1 with worst-case control bandwidth over the analog controller. A prototype is designed and built, and it experimentally validates the simulation results with good correlation.

Fig. 2. Dynamic improvement with proposed gain-scheduled design.