Electric vehicles (EVs) have gained significant adoption due to their advantages over conventional vehicles. The Photovoltaic Inductive Wireless Power Transfer (PV-IWPT) system combines wireless charging technology with photovoltaic panels to provide clean, solar-powered EV charging. However, varying distances between the ground and EV chassis create inconsistent coupling coefficients, causing fluctuating optimal load conditions for the IWPT converter and making it challenging to maintain peak efficiency without manual recalibration. This paper introduces a Ground-to-Chassis distance adaptive control approach for PV-IWPT systems that simultaneously achieve Maximum Power Point Tracking (MPPT) for solar harvesting and Maximum Efficiency Point Tracking (MEPT) for power transfer across different ground-to-chassis distances. The system automatically adapts to positional variations without requiring hardware adjustments. We validate our approach through theoretical analysis and experimental verification using a 500-W test platform under multiple distance configurations and solar shading conditions, demonstrating its practical viability for real-world applications.

In electric vehicle wireless power transfer systems, misalignment between primary and secondary coils commonly occurs, resulting in mutual inductance fluctuations that decrease transfer efficiency. To overcome this problem, this paper proposed a novel misalignment-tolerant coil design combining quadrupolar trapezoidal coils with unipolar square coils on the secondary side. These two sets of coils are connected in series through a diode rectifier, making the equivalent mutual inductance equal to the sum of their absolute mutual inductance values. When perfectly aligned, the unipolar square coils maintain good coupling with the transmitter coil while the quadrupolar trapezoidal coils remain decoupled. During misalignment, as the mutual inductance between unipolar coils and the transmitter decreases, the mutual inductance between quadrupolar coils and the transmitter increases. This complementary relationship maintains a nearly constant total equivalent mutual inductance, providing exceptional misalignment tolerance and stable system output. Simulation results show mutual inductance fluctuation of only 2.60%, with experimental verification demonstrating 3.11%. The output voltage fluctuation in simulation is just 2.51%, while the system achieves a peak efficiency of 95.52%.