As the use of photovoltaics becomes more widespread, new technologies for more efficient energy generation, transmission, and distribution based on power electronics converters are being developed. The most common applications are grid-on, energy storage, hybrid, and high voltage gain applications. These applications impose several additional requirements in the design of power converters associated with the solar battery’s maximum power tracking and operation in a wide range of input currents and voltages. The practical realization of such solutions can be implemented on the basis of various topologies, which requires a preliminary application of criteria for assessing their effectiveness. The paper conducts a comparison of different topologies on power converters based on two parameters that describe their cost and power loss for various PV applications. For a straightforward study, these parameters are represented using the gain factor, which allows for an accurate comparison of the efficiency of various types of converters.

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.

The paper discusses and evaluates design of capacitive wireless power transfer (WPT) system. The capacitive WPT can replace a conventional inductive WPT for example in applications where metallic objects are placed close to receiver or transceiver. Main limitation for wider application of the capacitive WPT is due to small coupling capacitance between two surfaces in limited space. Therefore, to utilize capacitive WPT system the switching frequency should be as high as possible. Challenges associated with design of capacitive WPT system operating in MHz range are discussed in this paper. In the paper it is described WPT system that consists of two copper plates to transfer power from the primary side to the secondary side. Some calculation considerations of resonant network is given in the paper. The high switching of inverter transistors requires high performance transistors with optimized driver circuit. The design of GaN transistor based inverter and driver circuit is discussed and experimental results are shown.

This paper presents comparative analysis of different spread-spectrum techniques for reduction of conducted emissions generated by strongly coupled magnetic resonant wireless power transfer (WPT) systems. The spread spectrum techniques analyzed in the paper are periodic frequency modulation, periodic duty ratio modulation and a combination of them. The analysis is based on computer simulations of the WPT system model created in PSIM environment. The effect of the spread spectrum techniques on the WPT system efficiency is also considered. Obtained results show that frequency modulation outperforms other spread spectrum techniques considered in the paper.

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.