Multi-Megahertz Load Independent Synchronous Rectifier for Resonant Wireless Power Transfer Applications

Rouse, Chris D.; Tahavorgar, Amir

doi:10.1109/apec43599.2022.9773547

Cited by 2 publications

(2 citation statements)

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“…Also, lossy eddy currents in nearby metal generated from alternating magnetic fields can be avoided in CPT [8,9]. Finally, CPT works best at higher frequencies, which can decrease the size and mass of lumped elements [1,10,11].…”

Section: Introductionmentioning

confidence: 99%

“…1 shows a simplified block diagram of a CPT system with the wireless link in the centre, an inverter on the transmit side, and a rectifier on the receive side. Resonant CPT (RCPT) is achieved when both sides of the wireless link are selfresonant at the operating frequency, e.g., via inductors [6,8,11]. This is advantageous when low coupling between transmitter and receiver exists, e.g., due to large air gaps in EV charging [3,6].…”

Section: Introductionmentioning

confidence: 99%

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Matrix Persymmetry Analysis for Misalignment and Foreign Object Detection in Resonant Capacitive Power Transfer

Herpers,

Rouse

2024

IEEE Access

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This paper introduces a persymmetry evaluation of capacitance matrices for resonant capacitive power transfer. Persymmetry analysis of the capacitance matrix indicates imbalances and allows for distinction between misalignments and foreign objects. Misalignment and foreign object detection are achieved with a parameter-based method. Voltages on the transmitter side of a resonant capacitive power transfer link are leveraged for detection. Simulations and supporting measurements were performed with a 13.56 MHz resonant capacitive power transfer link incorporating a six-plate structure for electric vehicle charging applications. Metallic and living tissue objects can be detected with the foreign object detection method. Furthermore, lateral misalignment and its direction are detectable for realignment purposes. Simulations show that the foreign object detection range is sufficient to avoid exceeding the basic restrictions for electromagnetic field exposure for kW-range power transmission. The capacitance matrix persymmetry results indicate that both lateral misalignment and foreign object detection are achievable and distinguishable with the parameter-based method. This work introduces practical solutions to detecting imbalances in resonant capacitive power transfer systems, which may improve reliability and safety in applications such as electric vehicle charging and electrified roadways.INDEX TERMS Capacitance matrix persymmetry, electric vehicle charging, foreign object detection, misalignment detection, resonant capacitive power transfer, wireless power transfer.

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