In this digest, an integrated capacitor design is proposed for higher order resonant tank topologies for self-resonant coils, such as series, parallel, LCC, LLC, etc. The capacitor is one of the large, lossy, and ther-mally vulnerable components of a high-frequency resonant tank, and designing a high-voltage, thermally sta-ble resonant capacitor can be extremely challenging. Designing the extremely high-voltage capacitor as an integral part of the coil will significantly reduce the size and complexity of the coil assembly. To achieve that target, a low-loss PCB-based high-voltage capacitor design is proposed which can be implemented as part of the coil itself. The proposed capacitor designs are simulated using multiphysics FEA and tested experimental-ly. A prototype of a 23 kV, 133 pF capacitor was built and tested as part of a 10 kW long-distance wireless charging system. The test results verify the capacitor’s performance regarding the voltage, current, and ther-mal resiliency.
