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In this paper, the case of a battery charger for electric vehicles based on a wireless power transmission is addressed. The specificity of every stage of the overall system is presented. Based on calculated and measured results, relevant capacitive compensations of the transformer and models are suggested and discussed in order to best match the operating mode and aiming at simplifying as much as...
In the recent decades, an enormous awakening in electrical vehicles researches and industries has raised the needs of safety and simplicity in the electrical vehicle battery charging. Many options are offered to transfer the electrical power wirelessly, comprising Inductive Power Transfer method which is a widely known way in doing a near-field wireless power transfer. In this paper, the proposed...
There is a growing interest in bidirectional dc-dc converters for interface battery with energy source and load. This paper provides a comprehensive review of non-isolated bidirectional dc-dc converter topologies. The classification and description of each type presented is based on the features and applications. This review paper is intended as a convenient reference to future non-isolated converter...
To improve the efficiency of electric vehicle technology, hybrid energy sources are being incorporated. Another strategy for improvement is to facilitate energy recovery in regeneration mode. So the solution to this to use a bidirectional DC-DC converter in electric vehicles. The improvement of efficiency can be further increased by using a non-isolated bidirectional DC-DC converter. In this paper,...
Topology control has received much attention in stationary sensor networks by effectively minimizing energy consumption, reducing interference, and shortening end to-end delay. The transience of mobile nodes in Vehicular Ad hoc A network (VANETs) renders topology control a great challenge. the existing edge connected topology control algorithms need to determine the value priori, but moving speeds...
In this paper, a reconfiguration strategy for distribution network based on a power supply capacity index (PSCI) is proposed to tackle the security problems caused by the increasing number of electric vehicles (EVs) with spatial-temporal charging loads in active distribution network (ADN). Firstly, a spatial and temporal model is developed to obtain all the EV charging loads in the ADN along one scheduling...
This paper proposes a novel battery-balancing mechanism. By modular and decentralized design, this balance circuit can be easily expanded for higher-voltage battery strings. Bidirectional flyback converter is applied to transfer the energy from and back to the connected battery module. A capacitor is placed on the common paralleled secondary side to serve as an energy buffer. Average string voltage...
In electric vehicles (EVs), Li-ion battery has been applied as the main power source. To give enough power and energy to the system, single Li-ion battery cells will be connected in series and parallel to make a battery pack. Thus, cell equalization for battery pack has been an important topic in battery management system (BMS). Recently, researches have proposed different topologies and control strategies...
A receiver for efficient wireless power delivery at 6.78MHz from smartphones to IoT devices has been designed in 0.18 µm CMOS. The receiver implements a technique to estimate the end-to-end efficiency and achieve maximum efficiency-point tracking (MEPT) across the charge cycle of a Li-ion battery without needing an explicit communication channel with the transmitter. The MEPT technique is tested using...
Contactless power transfer (CPT) has demonstrated its ability as a safe, efficient and convenient way for electric vehicle (EV) charging systems by providing acceptable power levels with tolerance to misalignments. The magnetic design of the primary and secondary coupler is one of the most critical parts of a CPT system design. This paper investigates various configurations of loosely coupled magnetic...
This paper deals with the approach of integrating a bidirectional boost-converter into the drivetrain of a (hybrid) electric vehicle in order to exploit the full potential of the electric drives and the battery. Currently, the automotive norms and standards are defined based on the characteristics of the voltage source. The current technologies of batteries for automotive applications have voltage...
This paper proposed a modular multilevel topology using power electronics transformers for the modular drivetrain of electric vehicles (EV). Because of its high modularity, the topology can be easily applied to a wide range of EVs, from personal vehicles to passenger cars. Compared with two conventional modular multilevel converters, fewer submodules are needed and its control is thus simpler. The...
Battery recovery effect is a phenomenon that the available capacity of a battery could increase if the battery can sleep for a while since its last discharging. Accordingly, the battery can work for a longer time when it takes some rest between consecutive discharging processes than when it works all the time. However, to the best of our knowledge, this impact has not been considered in the design...
Electromobility is expected to successfully compete with conventional propulsion technology in the near future and thus creates new challenges for the automotive industry. Major issues with state of the art electric vehicles (EVs) include limited range due to insufficient energy density and heavy weight of existing battery storage systems, unsatisfactory charging duration as well as comparatively...
Difficult building conditions but also the impairment of the cityscape through overhead lines can lead to high cost and lack of acceptance from citizens and town planners. In these cases the use of a tram with an energy storage (ES) which enables for catenary free operation (CFO) could be the more cost-effective solution and could create the necessary acceptance. This article presents the operational...
Charging stations are becoming an important part of the modern urban infrastructure. This paper describes a concept of a standalone cost-effective medium power charging station dedicated for electric bus charging. It is based on a voltage-source active rectifier operating in both current and voltage mode supplied by low voltage power grid. Appropriate model and simulation of the station at the power...
Inductive power transfer (IPT) is widely used for the contactless charging system. In an underwater environment, it's also a feasible way to the underwater vehicles for battery charging. In this paper, a novel design process of IPT system is implemented. Serial-serial (SS) topology is selected for the application due to the constant output voltage in a non-resonant state even with a various load....
The paper deals with the wireless battery chargers (WBCs) of electric vehicles (EVs) and refers to a resonant WBC that utilizes a rectifier-chopper stage in the receiver side to control the charging current/voltage of the EV battery. Two topologies, namely series-series and series-parallel, are considered, and their performance in terms of efficiency and power sizing is investigated. Power sizing...
This article gives an overview of the analysis and modelling for 22 kW wireless power transfer (WPT) for Light Duty (250V traction battery) and Heavy Duty (700V) electric vehicles (EV). The system under investigation is the series/series (SS) WPT compensation topology, for which an iterative design approach is considered to select the suitable final system parameters. A simulation study is performed...
A bidirectional DC-DC converter with high voltage gain and wide input and output voltage range is presented. The input voltage range is 30 V to 60 V and the output voltage range is 100 V to 400 V. The nominal power is 10 kW. The converter is based on a Dual Active Bridge in which the voltage range has been extended with a tap changer between the transformer and the high voltage H-bridge.
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