Compensate Capacitor Optimization for Kilowatt-Level Magnetically Resonant Wireless Charging System

Zhu, Qingwei; Wang, Lifang; Liao, Chenglin

doi:10.1109/tie.2014.2321349

Cited by 66 publications

(34 citation statements)

References 29 publications

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“…The authors have demonstrated 7.7 kW inductive CPT with LCC compensation on both sides for an air gap of 20 cm and the achieved efficiency between output power and input DC supply is 96%. Zhu et al proposed compensation capacitor optimization for an EV CPT charging system with a four-coil structure [47]. Optimal compensation is achieved by optimization search algorithm with measured coil parameters L, M at the selected frequency.…”

Section: Some Of the New Topologies Reported Until Nowmentioning

confidence: 99%

Review on Contactless Power Transfer for Electric Vehicle Charging

Ravikiran

Keshri

2017

Energies

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Abstract:For the past few years the feasibility of contactless power transfer (CPT) is being explored extensively as a future solution for charging electric vehicles (EVs). Studies report that the main obstacles in CPT are low power efficiency, misalignment tolerance, cost, range and charging time anxiety. This paper presents a review based on existing literature of the CPT systems for EV charging. Different cases of CPT technologies, their principle of operation and equivalent circuit based analysis is carried out. A discussion on compensation strategies and their effectiveness are reviewed and discussed. The design of coil systems for some city electric cars has been referenced in general. At the end recommendations and conclusions are made based on the study and analysis of the information available in literature.

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Section: Some Of the New Topologies Reported Until Nowmentioning

confidence: 99%

Review on Contactless Power Transfer for Electric Vehicle Charging

Ravikiran

Keshri

2017

Energies

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“…For different source voltages (U 1 = 700 V, U 2 = 800 V), the charging energy per kilometer as a function of driving speed, according to Equation (12), is shown in Figure 6.…”

Section: Strategy With Constant Source Voltagementioning

confidence: 99%

“…There are many research areas in on-road charging for EVs, such as coil design [8][9][10], compensation optimization [11][12][13], control methods [14][15][16][17], and real-time detection of EV positions [18]. These studies have laid solid foundations for commercialization of on-road charging systems.…”

Section: Introductionmentioning

confidence: 99%

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Power Control Strategies of On-Road Charging for Electric Vehicles

et al. 2016

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On-road charging systems for electric vehicles (EVs) have shown revolutionary potential in extending driving range and reducing battery capacities. The optimal equivalent load resistances to maximize receiving power of each EV according to different EV amounts are investigated. This paper introduces a typical on-road charging system with a single transmitting coil and multiple receiving coils. The equivalent circuit models according to different numbers of EVs are built. Power control strategies with regard to a varying number of EVs are then presented. Specifically, self-adaptive source voltage based on primary current detection is utilized to charge EVs, while the source can support enough EVs by providing the rated power. Otherwise, the source voltage is regulated to its maximum value and the charging energy of each EV is suggested to be controlled by adjusting the individual driving speed. A remarkable feature of the power control strategies is that the charging power for each EV is stable and can compensate for energy losses efficiently. As for urgent power demand from a particular EV with a low battery capacity, the adjustment of the corresponding load resistance is applied to alter the power distribution. The proposed technique has been verified in an experimental prototype.

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“…WPT techniques are broadly classified into near field and far field power transfer methods. Near field IRC and near field capacitive coupling methods are primarily investigated in the above mentioned applications [3,4]. Much research work has addressed the usage of near field IRC in biomedical implants and also some of the implants like pacemaker; chronic implants are available on the market with inductive powering technologies [5,6].…”

Section: Introductionmentioning

confidence: 99%

Class E Power Amplifier Design and Optimization for the Capacitive Coupled Wireless Power Transfer System in Biomedical Implants

et al. 2017

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Abstract:The capacitive coupled wireless power transfer (CCWPT) operating at megahertz (MHz) frequency is broadly considered as the promising solution for low power biomedical implants. The class E power amplifier is attractive in MHz range wireless power transfer (WPT) applications due to zero voltage switching (ZVS) and zero voltage derivative switching (ZVDS) properties. The existing design of class E amplifier is investigated only for inductive resonant coupled (IRC) WPT systems; the modelling and optimization of the class E amplifier for CCWPT systems are not deliberated with load variation. Meanwhile, the variations in the coupling distance and load are common in real time applications, which could reduce the power amplifier (PA) efficiency. The purpose of this paper is to model and optimize the class E amplifier for CCWPT systems used in MHz range applications. The analytical model of PA parameters and efficiency are derived to determine the optimal operating conditions. Also, an inductive-capacitive-inductive (LCL) impedance matching network is designed for the robust operation of the PA, which improves the efficiency and maintains required impedance compression. The maximum efficiency of the proposed design reached up to 96.34% at 13.56 MHz and the experimental results are closely matched with the simulation.

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Compensate Capacitor Optimization for Kilowatt-Level Magnetically Resonant Wireless Charging System

Cited by 66 publications

References 29 publications

Review on Contactless Power Transfer for Electric Vehicle Charging

Review on Contactless Power Transfer for Electric Vehicle Charging

Power Control Strategies of On-Road Charging for Electric Vehicles

Class E Power Amplifier Design and Optimization for the Capacitive Coupled Wireless Power Transfer System in Biomedical Implants

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