Wireless battery charging systems for electric vehicles (EVs) are convenient, safe, and flexible against environmental hazards. Resonant inductive power transfer (RIPT) is the most common method for EV battery charging applications. The inductive coil structure is a major component of the RIPT system, and misalignment between inductive coils is a key issue. This paper proposes an improved, misalignment-tolerant, novel dual orbirect inductive coil structure. The proposed coil structure is designed using finite element modeling (FEM) and investigates magnetic parameters such as self and mutual inductance at various horizontal and vertical misalignment distances. Finally, based on the FEM analysis, the RIPT system is designed for 1 kW, and simulations were carried out in MATLAB. The presented results show that the output voltage exhibits minimal variation across 50% misalignment range. The peak efficiency achieved at full load conditions is 96.2%.

This paper proposes a hybrid phase shift control strategy for dual side inductor-capacitor-capacitor compensated inductive power transfer (IPT) system to achieve a wide output voltage regulation range. The first-order harmonic time domain model is used to compute the inverter output voltage. Then, models of system operation in constant voltage (CV) and constant current (CC) modes are developed to analyze the efficiency of the battery charging process. The designed controller loops are validated for a 1 kW MATLAB Simulink model. Results show that a maximum efficiency of 93.80% is achieved at full load conditions, and the proposed control strategy achieves zero voltage switching (ZVS) in more switches than the conventional control method.

In order to expand the output voltage range for a series-series (S-S) resonant converter, a wide frequency modulation window is typically required, which can adversely affect the system's performance. The objective of the paper is to narrow down the necessary frequency window by optimizing the design of two resonant tanks of an S-S resonant converter. To address this, a novel 5-Switch bridge-based symmetric S-S resonant converter has been proposed. The 5-Switch bridge allows for the operation of the two S-S resonant tanks in various configurations by utilizing four distinct switch patterns. These configurations include both tanks functioning as lone half-bridges, two tanks in half-bridge modes, one tank in half-bridge mode and the other in full-bridge mode, and both tanks in full-bridge modes. To verify the performance of the proposed converter in different modes, the MATLAB/SIMULINK simulations have been performed at the power level of 7.2 kW with a wide output voltage of 200-800 V. The peak efficiency of the proposed converter absorbed around 95.3 % in full bridge mode.

This paper presents the performance analysis of a current source isolated bidirectional DC-DC converter (CSIBDC) for PV and Fuel Cell (FC) applications. The proposed CSIBDC converter has been chosen to integrate solar power with energy storage systems. Since the solar power is intermittent in nature and it has no dispatch ability on its own, the proposed converter can enable small voltages available from PV to step up by operating in the boost conversion mode. The current source dual active bridge (DAB) converter topology is a good choice for battery charging and discharging applications due to its bidirectional power transfer capability. To achieve high power density with ZVS transition, the proposed dual active bridge converter is operated with phase shift control technique. In order to evaluate the performance of the proposed DAB converter the simulations are carried out using PSIM software.