This paper presents a double-sided Z-configuration-based compensation network for an inductive power transfer (IPT) system for electric vehicles (EVs) with detailed analysis and optimization factors as an alternative to the double-sided LCC configuration. The contributions of the proposed article are as follows: (a) a double-sided Z-compensation configuration is developed, which provides a lower voltage and current stress on the passive components in comparison with double-sided LCC compensation; it has inherent zero phase angle properties for minimizing losses and improving system efficiency; (b) the Z-Z configuration achieves a load-independent constant voltage output and constant transmitting current; (c) additionally, the optimized compensation factors for the primary and secondary sides are derived for maximum inter-coil efficiency. It is evident that fine-tuning the compensation factors can minimize copper losses and ensure high efficiency over a wide load range, achieving up to 93.37% efficiency at optimal conditions. Experimental results from the 1 kW laboratory prototype validate the proposed designs, demonstrating comparable power transfer performance with lower losses and an effective and alternative solution for double-sided LCC-LCC-based higher-power IPT systems.

The wireless power transfer (WPT) method suffers from the problem of flux leakage between the trans-receiver coil pair which increases with an increase in the gap between them. The high-frequency excitation is induced in vehicle assembly from ground assembly. Here, the geometry of coils plays an important role in minimizing the flux leakage. To a certain extent, this flux leakage could be enhanced by using ferrite cores and high-conduction coils. In this paper, various regular geometry for trans-receiver coil pairs is discussed using finite element analysis tool, Ansys Maxwell. The high-frequency excitation of 800 V is supplied at 85 kHz and an investigation is done for the best coupling coefficient.

This paper presents a hybrid totem-pole (TTPL) PFC AC-DC converter that utilises a switched-capacitor (SC) cell for electric vehicle (EV) charging applications. The converter has the capability to function as a component of an OBC system, specifically for LV battery charging. It is suitable as a front-end converter for ratings up to 3.3 kW. Conventional boost PFCs exhibit a restricted ability to deliver a lower DC output than the input AC magnitude. The use of an additional stage to obtain lower DC outputs results in an increased number of components, decreased efficiency, and lower power density. The addition of an SC-cell with the highly efficient TTPL PFC configuration is used to address the issue of obtaining low output. A comprehensive analysis of the operational modes, accompanied by a detailed exposition of the design methodology, is presented. A 1 k W prototype of the converter design has been simulated and developed. The results indicate that the converter can function within a broad input voltage range of 90–270$V$AC and maintain an input current THD that falls within the limits specified by IEC61000-3-2.

A buck-boost derived power factor correction (PFC) AC-DC converter for on-board electric vehicle charging is proposed in this paper. Discontinuous current conduction mode (DCM) of operation for this converter enables natural power factor correction at the input side for a variable alternating current. Additionally, DCM does not require input sensors, which improves efficiency of the converter and reduces the cost. This converter is apt for low voltage (LV) chargers as a part of an on-board charging (OBC) with ratings ranging from 1kW to 3.3kW. Both simulation and experimental findings are presented to support the viability. For a wide input voltage range of 90270V AC, the converter operates at unity power factor (UPF) and input current total harmonic distortion (THD) within limitations.

As the role of converter configuration is vital in the AC charging units. This paper proposes a modified leg full-bridge DC-DC converter (FBDC), which operates with customized pulse width modulation (cmPWM) gating technique for electric vehicle (EV) applications. This configuration shown can work with zero voltage switching (ZVS) turn-on and zero current switching (ZCS) turn-off with minimal conduction losses and zero switching loss in the co-occurrence of conventional FBDC. Consequently, the problem of reverse voltage and voltage spikes is addressed by including the series diodes in the lagging leg and series or blocking capacitor in series with the main transformer, respectively. The converter’s design and comprehensive theoretical analysis are presented. To validate the design and analysis of the configuration, a 1.4 kW system is made in a laboratory operating at 80 kHz frequency.

In this paper, a unified adaptive energy management scheme (EMS) is proposed for renewable-interfaced hybrid energy storage system (HESS) under grid connected/islanded conditions. A second harmonic based phased locked loop is employed for effective synchronization/resynchronization of the microgrid system under contingency conditions. The operation and management of the microgrid system under both these modes are accomplished by an efficient adaptive power management algorithm. A quantitative analysis on the HESS performance is provided in order to investigate the effectiveness of the proposed approach. Load curtailment and off-maximum power point tracking features are also accommodated in the proposed scheme. This approach address seamless transfer between the various sub-modes of the system along with additional services such as power quality enhancement and effective power dispatch between various sources. The effectiveness of the proposed scheme is verified by both simulation and experimental investigations.