Auto tuning of frequency on wireless power transfer for an electric vehicle

<p>In these days, electric vehicles are enthusiastically researched as a countermeasure to air pollution, although these do not have practicality compared to gasoline-powered vehicles. The aim of this study is to transport energy wirelessly and efficiently to an electric vehicle. To accomplish this, we focused on frequency of an alternating current (AC) power supply, and suggested a method which determined the value of it constantly. In particular, a wireless power transfer circuit and a lithium-ion battery in an electric vehicle were expressed with an equivalent circuit, and efficiency of energy transfer was calculated. Furthermore, the optimal frequency which maximizes efficiency was found, and the behavior of voltage was demonstrated on a secondary circuit. Finally, we could obtain the larger electromotive force at the secondary inductor than an input voltage.</p>

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Potential for CO2 Reduction by Dynamic Wireless Power Transfer for Passenger Vehicles in Japan

Energies ◽

10.3390/en13133342 ◽

2020 ◽

Vol 13 (13) ◽

pp. 3342 ◽

Cited By ~ 2

Author(s):

Osamu Shimizu ◽

Sakahisa Nagai ◽

Toshiyuki Fujita ◽

Hiroshi Fujimoto

Keyword(s):

Electric Vehicle ◽

Long Range ◽

Electric Vehicles ◽

Co2 Emission ◽

Measurement Data ◽

Wireless Power Transfer ◽

Internal Combustion ◽

Power Transfer ◽

Wireless Power ◽

Actual Measurement

In this study, a novel system named the third-generation wireless in-wheel motor (WIWM-3), which has a dynamic wireless power transfer (DWPT) system, is developed. It can extend the cruise range, which is one of the key specifications of electric vehicles. DWPT also reduces CO2 emission as the driving resistance is reduced due to light weight of the batteries. In this study, CO2 emission by an internal combustion vehicle, a long range drivable electric vehicle with the same cruise range, and an electric vehicle with WIWM-3 equipped with the DWPT system are analyzed using actual measurement data and calculated data based on actual measurement or specification data. A WPT system with WIWM-3 achieves 92.5% DC-to-DC efficiency as indicated by an actual measurement at the nominal position. Thus, the electric vehicle with DWPT can reduce up to 62% of CO2 emission in internal combustion vehicles, and the long-range drivable vehicle emits 17% more CO2 than the electric vehicle with DWPT. Moreover, it is expected that by 2050, electric vehicles with DWPT will reduce CO2 emissions from internal combustion vehicles by 95% in Japan. DWPT systems make electric vehicles more sustainable and, hence, more acceptable for consumers.

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A case Study on wired and Wireless charger standards in India for Electric Vehicle Application

E3S Web of Conferences ◽

10.1051/e3sconf/20198701017 ◽

2019 ◽

Vol 87 ◽

pp. 01017

Author(s):

Shivanand M N ◽

Y. Maruthi ◽

Phaneendra Babu Bobba ◽

Sandeep Vuddanti

Keyword(s):

Electric Vehicle ◽

Electric Vehicles ◽

Energy Demand ◽

Wireless Power Transfer ◽

International Electrotechnical Commission ◽

Power Transfer ◽

Wireless Power ◽

Transfer Factors ◽

Charging Infrastructure ◽

Ev Charging

India has taken major step in adopting the electric vehicle by means of FAME Scheme (Fast Adoption and Manufacturing of Electric Vehicles), a government initiative. ARAI (Automotive Research Authority of India) and DHI (Department of Heavy Industry) have published standardization protocol for both EV charging infrastructure. Many of those standards are derived from the SAE (Society of Automotive Engineers) Internationals and IEC (International Electrotechnical Commission). USA, Europe and China are also following the same standards to build the EV (Electric Vehicle) infrastructure. This paper provides the Indian standards to build EV charging infrastructure and comparing it with other countries. Glimpses on energy demand for electric vehicles in Indian market. It also provides the demanding wireless power transfer technology in EV’s. Status of Standards provided by the industry on wireless power transfer. Factors that are necessary to be considered before drafting the standards for WPT.

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Electric vehicle wireless power transfer (WPT) systems

10.3403/30405940 ◽

2020 ◽

Keyword(s):

Electric Vehicle ◽

Wireless Power Transfer ◽

Power Transfer ◽

Wireless Power

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Maximizing Transfer Efficiency with an Adaptive Wireless Power Transfer System for Variable Load Applications

Energies ◽

10.3390/en14051417 ◽

2021 ◽

Vol 14 (5) ◽

pp. 1417

Author(s):

Jung-Hoon Cho ◽

Byoung-Hee Lee ◽

Young-Joon Kim

Keyword(s):

Loading Condition ◽

Wireless Power Transfer ◽

Input Voltage ◽

Transfer Efficiency ◽

Maximum Efficiency ◽

Variable Load ◽

Power Transfer ◽

Wireless Power ◽

Variable Loading ◽

Power Transfer Efficiency

Electronic devices usually operate in a variable loading condition and the power transfer efficiency of the accompanying wireless power transfer (WPT) method should be optimizable to a variable load. In this paper, a reconfigurable WPT technique is introduced to maximize power transfer efficiency in a weakly coupled, variable load wireless power transfer application. A series-series two-coil wireless power network with resonators at a frequency of 150 kHz is presented and, under a variable loading condition, a shunt capacitor element is added to compensate for a maximum efficiency state. The series capacitance element of the secondary resonator is tuned to form a resonance at 150 kHz for maximum power transfer. All the capacitive elements for the secondary resonators are equipped with reconfigurability. Regardless of the load resistance, this proposed approach is able to achieve maximum efficiency with constant power delivery and the power present at the load is only dependent on the input voltage at a fixed operating frequency. A comprehensive circuit model, calculation and experiment is presented to show that optimized power transfer efficiency can be met. A 50 W WPT demonstration is established to verify the effectiveness of this proposed approach.

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