To improve misalignment tolerance in Inductive Power Transfer (IPT) systems for EV charging applications, this paper proposes a DDQDD magnetic coupler integrated with an LCC-S hybrid compensation topology and an additional coupling between the primary and secondary compensation inductors. This design enhances output power stability under positional mismatch while eliminating the need for separate compensation coils on the PCB, contributing to a more compact and efficient converter structure. A mathematical model is developed to analyze the effects of x- and y-axis misalignments on mutual inductance and system performance. A 0.7-kW prototype is constructed to validate the theoretical model and demonstrate the system's robustness. Experimental results show that while the additional coupling slightly reduces peak power under ideal alignment, it significantly reduces output power fluctuation under misalignment—from 70% to 5.4% in the y-direction—while maintaining Zero Voltage Switching (ZVS). These findings confirm the proposed approach’s effectiveness for high-efficiency wireless power transfer with enhanced spatial tolerance.

This paper presents a study of the relationships between magnetic coupler sizing and the system power level based on a electric vehicle dynamic charging system. In the study, the primary topology is fixed while the configurable secondary pad is scaled by two individual factors-along (X) and perpendicular (Y) to the driving direction-to represent circular and DD pads of different sizes. Simulation results show that a maximum power can be found during the process of expanding a secondary pad in its X direction when its$\mathrm{Y}$directional scaling factor remains constant. Analysis has been carried out to further study the sensitivity of this maximum power to the two scaling factors and different misalignment conditions. In addition, a power density metric is used to determine the optimum sizing for modular secondary systems for higher power requirements.

According to recent improvements in microgrid and Renewable Energy Sources (RESs), it is vital to use an alternative system for conventional transformers due to its lack of controllability and having high volume and weight. So, the senses gathered to the Solid-State Transformer (SST) because of its relevant advantages. A power electronic converter converts a low-frequency ac voltage waveform to a medium frequency voltage with variable amplitude in most SST structures. First, there is a need to convert the DC voltage to a pure sinusoidal one for using the High Voltage DC (HVDC) in Distributed Generator (DG) sources such as Photovoltaic (PV) farms and microgrids. Then an ac-ac converter is used to produce a medium frequency waveform. These structures need two stages of energy conversions. This paper proposes a new configuration with a specific modulation method to convert the DC voltage waveform directly to a medium frequency voltage waveform with variable maximum amplitude. The simplicity of the control system, reduced volume, and weight, as well as the reduced number of energy conversion stages are the advantages of the proposed system.

Wireless power transmission (WPT) systems can be a safe, efficient, and economical option in the long run for motor supplying in electric vehicles. The precise design of magnetic structures has a significant impact on the performance of such systems. In dynamic WPT (DWPT) systems, especially for wireless drive applications, due to the vehicle moving in four directions, the misalignment between the primary and secondary sides is considered as a limitation of this technology. In this paper, for a DWPT system with Double D magnetic pads for both sides, adding auxiliary windings in the secondary side, and introducing a suitable compensator in the primary side, a structure is proposed that tolerates the misalignment in all four directions.

Wireless Power Transfer has been proposed for electric vehicle charging applications to obviate problems associated with battery size, weight and cost. This paper proposes a control method to achieve maximum efficiency and load voltage regulation in such applications. The resonance frequency of the system is used as the optimum operating frequency and a DC-DC Buck converter is employed for tuning equivalent load resistance. Because the system optimum operating point depends on the mutual inductance of the transmitter and receiver coils, an estimation method is introduced to determine the inductance and the optimum operating point online. The control scheme adjusts the duty ratio of transmitter side inverter to fix the load voltage upon changes in the mutual inductance. This would be a cost saving solution since it does not use an extra converter.