Maximum Efficiency of Contactless Power Transfer Systems using k and Q

Tohi, Takahiro; Kaneko, Yasuyoshi; Abe, Shigeru

doi:10.1541/ieejias.132.123

Cited by 35 publications

(18 citation statements)

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“…3. To derive an equation for the theoretical transmission efficiency (η), an analysis method was constructed based on that of Tohi et al, in which the copper loss of the WPT system is considered (28) . Table 2.…”

Section: Equivalent Circuit Analysismentioning

confidence: 99%

“…(28). Two lead storage batteries (Type: 44B19R, 12 V, 34 Ah) connected in series were used as the load.…”

Section: Wireless Charging Systemmentioning

confidence: 99%

“…Figure 12 shows a time course of the voltage and current during battery charging. The WPT system in the SS mode has immittance conversion characteristics (28) . Common utility power acts roughly as a constant voltage supply, so that the WPT system in the SS mode acts almost as a constant current supply.…”

Section: Wireless Charging Systemmentioning

confidence: 99%

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Development of Design Methodology for 60Hz Wireless Power Transmission System

2016

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We previously reported a 60 Hz wireless power transmission (WPT) system, which is a system that uses the common utility frequency. In the study reported in paper, we solved several issues in order to install this system in a small electric vehicle. First, an accelerated finite difference time domain (FDTD) method using a graphics processing unit was developed to solve the issue of computation time. Next, theoretical equations for the transmission efficiency (η) and power (P out ) that include the stray load loss were derived from an equivalent circuit analysis. A new device was designed based on these theoretical equations, where by η = 70% and P out = 451 W were achieved for a transmission distance of 150 mm. Finally, we attempted to wirelessly charge of a lead storage battery. The overall efficiency of the wireless charging system was maintained at 60% during battery charging.

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Section: Equivalent Circuit Analysismentioning

confidence: 99%

“…(28). Two lead storage batteries (Type: 44B19R, 12 V, 34 Ah) connected in series were used as the load.…”

Section: Wireless Charging Systemmentioning

confidence: 99%

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Development of Design Methodology for 60Hz Wireless Power Transmission System

2016

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“…Table I lists the equations for the maximum efficiency η max and R Lmax of the SP methods, PP methods, and SS methods. From Table I, the equation for the maximum efficiency of the PP methods is the same as that of the SP methods [6].…”

Section: ) Maximum Efficiency Of Series and Parallel Resonant Capacimentioning

confidence: 99%

A large air gap 3 kW wireless power transfer system for electric vehicles

Takanashi

Sato

Kaneko

et al. 2012

2012 IEEE Energy Conversion Congress and Exposition (ECCE)

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163

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A wireless power transfer system for electric vehicles is required to have high efficiency, a large air gap, and good tolerance for misalignment in the lateral direction and to be compact and lightweight. A new 3 kW transformer has been developed to satisfy these criteria using a novel H-shaped core and split primary capacitors. The design procedure based on the coupling factor k, the winding's Q, and the core loss is described. An efficiency of 90% was achieved across a 200 mm air gap.

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“…MRCWPT is superior to other WPT methods (e.g. magnetic induction, electric field coupling, microwave) in terms of transmission distance, efficiency and transmission power [2] , [3]. Frequency characteristic of transmission coils is the dominant characteristic.…”

Section: Introductionmentioning

confidence: 99%

Design of multi-frequency coil for capacitor-less wireless power transfer using high order self-resonance of open end coil

Furusato

Imura

Hori

2016

2016 IEEE Wireless Power Transfer Conference (WPTC)

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Abstracl-Wireless power transfer is a popular research subject in recent years. Available frequency for wireless power transfer (WPT) is limited by the industrial, scientific, and medical (I SM) radio bands in MHz band and some laws. Depending on the application of wireless power transfer, different frequency bands are used. A single transmitter coil which can adapt to multiple frequency bands is needed for reducing number of transmitter coils. In this paper, transmitter coil design for multiple frequencies using high order resonant frequency is proposed. Main purpose of coil design is that first resonant frequency is allocated at 85 kHz for Electric Vehicles and second resonant frequencies of multi-frequency coil is allocated at ISM bands. Characteristics of proposed coil is confirmed by electromagnetic simulation and experiment.

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Maximum Efficiency of Contactless Power Transfer Systems using k and Q

Cited by 35 publications

References 0 publications

Development of Design Methodology for 60Hz Wireless Power Transmission System

Development of Design Methodology for 60Hz Wireless Power Transmission System

A large air gap 3 kW wireless power transfer system for electric vehicles

Design of multi-frequency coil for capacitor-less wireless power transfer using high order self-resonance of open end coil

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