Resilient Capacitive Power Transfer System: A Novel Double-Sided LC Compensated System With Enhanced Misalignment Tolerance

To augment power transfer capacity of capacitive power transfer (CPT) systems, a prevalent approach involves cascading inductive power transfer (IPT) boost links on both the input and output sides of the resonant topology. The application of inverse coupled current doubler rectifier (ICCDR), whose input characteristics can be accurately described by an equivalent parallel resistor-inductor model, further elevates the integration degree by consolidating functionalities of twofold voltage boosting and AC-DC conversion. This article proposes a systematic parameter design methodology, which innovatively incorporates the virtual shunt input inductance of ICCDR into the resonant topology design. By establishing conditions for load-independent operation and a zero derivative with respect to the coupling coefficient at the nominal point, this method substantially enhances misalignment tolerance of CPT system while ensuring stable output voltage across a wide load range. Furthermore, through judicious design for the admittance angle of global topology, which includes the primary-side IPT link, the inverter can achieve zero voltage switching (ZVS) operation. The theoretical design is validated on a 200-V, 500-W prototype, which successfully maintained 93% of the nominal output voltage under lateral misalignments of exceeding 29% and across a load resistance range of 80- to 120-.