The correct choice, calculation and design of the magnetic components of the system is a key factor of the high efficiency of the transmission of energy and reduce the mass-dimensional parameters of the coils. The paper is devoted to optimization of inductance coils for inductive power transfer. The paper compares and selects the shape of the coil and the core, and substantiates required for shielding. The influence of the design of the geometric parameters on magnetic and electrical characteristics of coils is investigated. On the basis of the conducted analysis, coils with and without a ferrite core are developed and simulated, a change in the parameters of the coils in case adding of ferrite coil are shown.

This paper describes novel inductive power transfer approach based on Z-source network with auxiliary circuit. Theoretical analysis along with simulation verification is presented. The main advantages and limitations of the proposed solutions are discussed in conclusions.

This paper presents an inductive power transfer system on the basis of a double single-phase three-level T-type inverter and two split transmitting coils for constant current and constant voltage wireless charging of low-voltage light electric vehicle batteries with closed-loop control, considering time-delay communication constraints. An optimal control structure and a modified control strategy were chosen and implemented to the wireless power transfer system as a result of a review and analysis of existing solutions. The control system analysis and adjustment of the coefficients of the regulator using Laplace transform were performed. Our study addressed the behavior of the control system with different time delays as well as the dynamic response of the system. The detecting algorithm of a secondary coil was proposed, which ensured efficient system operation and increased the functionality, safety and usability of the device. The efficiency of energy transfer of 90% was reached at the transmitted power of 110 W, which is at the level of existing solutions considered in the article and opens the way to the commercialization of the proposed solution. Therefore, the feasibility of using a nonclassical multilevel inverter, together with split transmitting coils for wireless charging was confirmed.

This article presents a non-conventional approach to a multi-coil wireless power transfer system based on a Z-source network. The novelty of the approach lies in the use of a Z-source as a voltage source for energy transmission through the wireless power transfer coils. The main advantage is in a reduced number of semiconductors. This paper provides the design approach, simulation and experimental study. Feasibility and possible application fields are presented in the conclusions.

This study proposes an example of a wireless charging station design for a small-scale vehicle available on the market. The article analyzes basic transmitter inverter topologies and their compensation methods in terms of flexibility of control, tolerance to uncertainty in positioning, and the possibility of decreasing the integration price. Our comprehensive analysis focuses on the battery voltage range, energy capacity, cost, and travel distance. We evaluate the constraints of efficiency, transmitted power, amount of used material, and size of the energy delivery system based on our design example. The aim is to increase the penetration of wireless technology in terms of convenience and integration capabilities.