Universal Resonant Parameter Design Method Based on Multiple Boundary Constraints for Wireless Fast Charging

Traditional resonant parameter design methods below MHz applications primarily rely on designer's experience and labor-intensive trial-and-error processes, which are not only time-consuming and inefficient but also fail to optimize system performance. This research proposes a universal resonant parameter design method based on multiple boundary constraints (MBCs) guiding engineers to complete the system design efficiently for wireless fast charging. This design method comprehensively considers multiple factors in parameter design and innovatively transforms them into constraint relationships, which are then mapped onto a 2-D plane graph to optimize the selection of self-inductances for the transmitting and receiving coils. Beyond rapidly generating an optimized coil design, this design method can also assist designers in refining unreasonable design specifications, significantly enhancing design efficiency and ensuring design results completely leverage superior system performance. According to experimental results, the coils developed with the MBCs-based method not only enable the WPT system to obtain outstanding steady-state and dynamic performance, but also result in high transfer efficiency. With a coupling coefficient k of 0.183 or 0.151, the maximum transfer efficiency can achieve 94.83% or 93.93% under the power rating of 1 kW as well as 91.25% or 87.87% under the power rating of 288 W (light load condition).