Category: Wireless Power

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UK motorway to charge electric cars on the move

The Highways Agency intends to equip an English motorway to test wireless charging of moving electric cars.

The Highways Agency (HA) has yet to give details of the trial site or dates. But it has issued criteria for system adoption, including a lifecycle comparable to that of asphalt (typically around 16 years), cost-effective maintenance, resistance to vibration and weather, and efficient charge collection at high speeds.

Static inductive charging experience to date in the UK involves test cars parking at existing plug-in stations in London and an electric bus service launched in January 2014 in Milton Keynes, where vehicles top up their overnight charge during drivers’ rest breaks. Managing this five-year demonstration is the eFleet Integrated Service joint venture between Mitsui Europe and consulting engineers Arup.

Arup helped create a wireless power transfer system branded HALO in Auckland, New Zealand in 2010. US wireless technology developer Qualcomm, which bought HALO in 2011, is running the London static car trial and planning a dynamic test track in Auckland.

For operational experience, the HA can look to Asia, where the Korea Advanced Institute of Science and Technology (KAIST) is running two online electric vehicle (OLEV) buses on a 12km continuous charging route in the city of Gumi. It claims 85 per cent maximum efficiency in power transfer.

The HA will also be monitoring the semi-dynamic charging trial highlighted by Transport Scotland chief executive David Middleton at a Chartered Institute of Highways & Transportation conference in March 2014. A halfway house between static and dynamic technologies, it will enable a hybrid bus to pick up charge from a series of modules installed under the road surface at strategic points along the route so it can run for long periods in fully electric mode.

A Transport Scotland spokesman explains that the approach “is likely to cause less disruption than, for example, installing dynamic charging along the length of a road”.

A similar technique is being used in Braunschweig, Germany, where a bus fitted with Bombardier Primove fast-charge technology went into passenger service on 27 March.

Source: E & T

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DENSO to Test Wireless Charging System

Global automotive supplier DENSO Corporation will begin a ten-month field test of its wireless battery charging system in Toyota City, Aichi Prefecture, Japan. The field test is intended to identify any potential operational issues and also look at ways to enhance the convenience of wireless charging. The field test will begin on Feb. 24 and end in December 2014.

How it works:

When there are two coils apart, electric current can flow through one coil by applying electricity to the other coil. The wireless charging system uses this mechanism to wirelessly transmit power from a power transmission pad on the ground to a power-receiving pad equipped on a vehicle.

For the test, DENSO has equipped a Yamato Transport delivery truck with a power receiver that will wirelessly receive the energy from a power transmission pad located on the pavement of a 7-Eleven convenience store parking lot. The electricity charged in the truck’s battery is then used to power the refrigeration system while the engine is stopped during pickups and deliveries. Not only will the system improve convenience, but it will also help reduce emissions of refrigeration trucks since the battery will continue to power the refrigeration system even when the engine is off.

DENSO has been developing the wireless charging system with the goal to commercialize by 2020. DENSO is working to reduce the size, weight, and cost of the system while also looking to enhance convenience.

In Japan, Toyota City is designated as an experimental city for next-generation energy sources and social systems, a program which has been promoted by Japan's Ministry of Economy, Trade and Industry since April 2010.

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Toyota begins testing wireless recharging [VIDEO]

Recharging a Toyota plug-in hybrid or all-electric vehicle could in future be as simple as parking the car. Toyota has announced verification testing is to begin later this month of a new wireless battery charging system it has developed for vehicles that use an electric powertrain.

The new technology allows a vehicle to be charged simply by parking it in alignment with a coil set into the surface of the ground. This makes the process simpler and easier, dispensing with cables and connectors.

The Toyota charging system transmits electricity using magnetic resonance created by changes in magnetic field intensity between a transmitting coil in the ground and a receiving coil in the car. It is designed so that it can reduce any loss in power transmission efficiency caused by misalignment or height differences between the coils.

The system is being developed with a future market launch in mind. Measures have been taken to minimise any electromagnetic interference with nearby equipment, and the transmitting coil in the ground has been madde robust enough to withstand vehicles driving over it.

To help the driver align the car correctly, Toyota has developed a function for its Intelligent Parking Assist system that shows the position of the transmitting coil in a parking space.

The test programme involves three plug-in hybrid used by homes in Aichi prefecture in Japan. It will assess user satisfaction, the system’s ease of use, misalignment rates and charging behaviour, such as how often charging takes place and timer-based charging it used.

Toyota will use the test results to develop the technology further, with the ultimate aim of bringing the system to market. Toyota believes its commercialisation will help promote the use of electrified vehicles and mobility options that are smarter, easier to use and kinder to the environment.

Wireless Battery Charging System key specifications
Charging methodMagnetic resonance
Frequency85kHz
Input voltageAC 200V
Charging power2kW
Charging timeApprox. 90 minutes
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Toyota signs wireless charging deal with WiTricity

WiTricity, an industry pioneer in resonant wireless power transfer over distance, today announced an intellectual property license agreement with the world’s top-selling carmaker, Toyota Motor Corporation.

Having made an equity investment in WiTricity in 2011 to accelerate the development of automotive wireless charging systems and acceptance by carmakers, Toyota has cooperated technically with the company for the past several years. Under this intellectual property license agreement, Toyota will offer wireless charging power capture devices on their future rechargeable hybrid electric and battery electric vehicles. Compatible wireless charging sources will be manufactured by third party charging system suppliers, under license from WiTricity.

WiTricity’s technology delivers electric power safely over distance and eliminates the need for the charging cable that is required for EVs and PHVs that are currently on the market. Toyota has identified this technology as a key differentiator in the marketplace because of its seamless operation and the convenience factor it offers the vehicle owners.

“WiTricity’s mission is to make wireless charging available as widely as possible, and this announcement is a significant step toward accomplishing that mission,” said WiTricity CEO Eric Giler. “We envision a world in which wireless charging accelerates the adoption of clean, green electrified vehicles. To have Toyota, the world’s leading carmaker, licensing our intellectual property, underscores the importance of the technology.”

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Volvo Developing Wireless Charging for Electric Vehicles

The Swedish car manufacturer has announced the development of an energy transfer technology that uses electromagnetic fields. Long term, Volvo sees the technology leading to cordless charging solutions for its hybrid and all-electric vehicles.

In an official press release, Volvo's Vice President for Electric Propulsion Systems, Lennart Stegland, announced that “inductive charging has great potential” and is “a comfortable and effective way to conveniently transfer energy.” Volvo's tests also indicated that the method is safe, although there are currently no common standards for charging vehicles using induction, a fact that makes it difficult to bring it to mainstream consumers in the near future. Nonetheless, Volvo will continue researching the concept and will soon evaluate the feasibility of integrating it into future hybrid and all-electric cars.

Inductive charging uses electromagnetic fields to transfer energy from one source to another. One induction coil, located in the power source, creates an alternating electromagnetic field, while a second coil draws the energy from the first to recharge the vehicle's battery. Charging begins automatically as soon as the vehicle is positioned over the charging apparatus, without requiring the use of cables or plugs. Volvo claims that the technology is already used today in a number of home appliances, such as electric toothbrushes.

The research project was carried out in partnership with Flanders' Drive, an automotive industry think tank in Belgium. The study showed that it is possible to recharge the Volvo C30 Electric without the use of cables in 2 hours and 30 minutes.

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WiTricity Secures Additional $25 Million in Funding

WiTricity announced today it has secured $25 million in Series E financing from new and existing investors, including Intel Capital and Hon Hai/Foxconn, one of the world’s largest consumer electronics manufacturers. The funding will support the company’s growth strategy as it further develops designs and products for wireless charging in the consumer electronics, electric vehicles, defense and medical device industries, as well as allowing WiTricity to pursue other strategic growth opportunities in the wireless power field.

“WiTricity’s vision is to usher in a world where wireless power is so ubiquitous, you never have to think about plugging in again,” said WiTricity CEO Eric Giler. “In securing this funding from our investors we are even more effectively positioned to fulfill that vision and deliver game-changing wireless technology to partners and customers around the globe.”

The announcement marks the next phase in WiTricity’s continued growth as a leader in the wireless power space. According to analyst firm IMS Research, the global market for wireless power will grow 86.5 percent annually to be worth $4.5 billion in 20161. As the inventor of Highly Resonant Wireless Power Transfer, WiTricity is poised to capture that market through existing and new partnerships with major manufacturers including Audi, Mitsubishi, Delphi, Haier, IHI, MediaTek and Thoratec.

With this infusion of $25 million, WiTricity’s investment funding now totals $45 million. In addition, the company recently secured its 50th patent, positioning it even more strongly for growth and success in the global market.

WiTricity have previously announced wireless electric vehicle charging partnerships with Audi, Toyota, Delphi, Mitsubishi and IHI.

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Toyota to add Wireless Charging to Plug-In Prius

During the recent Toyota Hybrid World Tour Satoshi Ogiso, Managing Officer of Toyota Motor Corporation said Toyota will begin verification of wireless/inductive charging system system in Japan, the US and Europe in 2014.

We have been listening very carefully to Prius PHV owners over the past two years… and are considering their requests for additional all-electric range.

We have also heard from these owners, that they would like a more convenient charging operation. In response, we are developing a new wireless/inductive charging system that produces resonance between an on-floor coil and an onboard coil to recharge the battery without the fuss of a cable.

We will begin verification of the system in Japan, the US and Europe in 2014.

Nissan recently said they are working on an open source wireless induction charging system and that five future Nissan-brand EVs will use inductive charging.

Source: Toyota

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Nissan to expand EV lineup to 5 models all with Wireless Charging

Nissan Motor Co. says it will expand its global EV product line to five models.

The company has not announced what additional models it is planning and has not specified a timetable. But it indicates Nissan is taking a long-term view of the slow-growing EV market.

"We haven't announced what models they will be, but we have plans for five," Carla Bailo, senior vice president for R&D at Nissan Americas, told reporters. "The others will come in due time."

Bailo said future Nissan-brand EVs will use inductive charging -- an emerging advanced technology for recharging the batteries of electric cars wirelessly. Inductive chargers enable an EV owner to park on top of a charging mat to recharge a battery without hooking up a connector.

"Once that technology is ready, we will use it across our brands," she said after her presentation.

Previously, Nissan had said inductive charging was critical to differentiate the luxury EV planned for the Infiniti brand.

Production of the cargo van begins later this year in Europe, initially for the European market. But this spring, Infiniti President Johan de Nysschen said the Infiniti EV will be delayed. Infiniti said it wanted to wait for improvements in inductive charging technology.

That means that only the Leaf has made it to market so far, after more than three years of promoting the idea of EVs. The company spent $1.8 billion to move U.S. production of that model to Smyrna, Tennessee, and to construct a lithium ion battery module plant there. That factory, which began production in January, gives Nissan the capacity to build up to 150,000 Leafs a year and 200,000 batteries.

Sales of the car in the United States have more than tripled since last year, when it was still being imported. Through July, Nissan dealers sold 11,703 Leafs, up from 3,543 in the first seven months of 2012.

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World’s First Road Embedded Wireless Electric Vehicle Network Opens

Two cordless rechargeable Hyundai battery electric buses have been put in service this week in a pilot program in Gumi, South Korea.

The Online Electric Vehicle (OLEV), developed by the Korea Advanced Institute of Science and Technology (KAIST), is an electric vehicle that can be charged while stationary or driving, thus removing the need to stop at a charging station. Likewise, an OLEV tram does not require pantographs to feed power from electric wires strung above the tram route.

Two OLEV buses will run an inner city route between Gumi Train Station and In-dong district, for a total of 24 km roundtrip. The bus will receive 20 kHz and 100 kW (136 horsepower) electricity at an 85% maximum power transmission efficiency rate while maintaining a 17cm air gap between the underbody of the vehicle and the road surface.

OLEV is a groundbreaking technology that accelerates the development of purely electric vehicles as a viable option for future transportation systems, be they personal vehicles or public transit. This is accomplished by solving technological issues that limit the commercialization of electric vehicles such as price, weight, volume, driving distance, and lack of charging infrastructure.

OLEV receives power wirelessly through the application of the "Shaped Magnetic Field in Resonance (SMFIR)" technology. SMFIR is a new technology introduced by KAIST that enables electric vehicles to transfer electricity wirelessly from the road surface while moving.

Power comes from the electrical cables buried under the surface of the road, creating magnetic fields. There is a receiving device installed on the underbody of the OLEV that converts these fields into electricity. The length of power strips installed under the road is generally 5%-15% of the entire road, requiring only a few sections of the road to be rebuilt with the embedded cables.

OLEV has a small battery (one-third of the size of the battery equipped with a regular electric car). The vehicle complies with the international electromagnetic fields (EMF) standards of 62.5 mG, within the margin of safety level necessary for human health.

The road has a smart function as well, to distinguish OLEV buses from regular cars—the segment technology is employed to control the power supply by switching on the power strip when OLEV buses pass along, but switching it off for other vehicles, thereby preventing EMF exposure and standby power consumption. As of today, the SMFIR technology supplies 60 kHz and 180 kW of power remotely to transport vehicles at a stable, constant rate.

After the successful operation of the two OLEV buses by the end of this year, Gumi City plans to provide ten more such buses by 2015.

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Oak Ridge Lab to develop dynamic wireless EV charging

South Carolina’s leading automotive research center and premier technology and aviation business park have partnered to study next-generation vehicle technology.

The Clemson University International Center for Automotive Research (CU-ICAR) and the S.C. Technology Aviation Center (SCTAC) have contracted with Oak Ridge National Laboratory to support a three-year program to develop and test wireless charging systems for electrical vehicles.

The research is funded by the U.S. Department of Energy.

Wireless Power Transfer Charging (WPTC) of an electric vehicle does not require the use of cables or plugs and could substantially increase convenience — and possibly the number of opportunities — to charge an electric vehicle throughout the daily drive.

For instance, when wireless charging is applied in quasi-dynamic (stop-and-go) or dynamic (vehicle-in-motion) modes, the technology could lead to extended range and downsized batteries for electric vehicles. Such innovations are likely to greatly speed development of electric-powered passenger vehicles by addressing the current technology’s two biggest challenges: range and cost.

CU-ICAR research professor Joachim Taiber, who will lead the project for Clemson, said batteries in next-generation electric-powered vehicles can be made smaller and lighter, greatly increasing the efficiency of power transfer.

“This partnership can advance wireless-charging technology and spark growth in the marketplace because consumers will worry less about range-related issues,” Taiber said.

As part of the project, CU-ICAR and SCTAC researchers will validate the Oak Ridge-developed technology, optimize system design and develop the required communication networks for the wireless charging system.

Testing of the technology will take place at SCTAC and on the Oak Ridge main campus. SCTAC will be a unique, cutting-edge technology demonstration facility and airpark, which currently is home to 85 diverse companies with an international presence in advanced manufacturing, trade, technology and avionics.

“This joint initiative marks the next step in the progression of our strategic partnership with CU-ICAR and multiple private stakeholders in the development of a world-class test track infrastructure to support the rapidly emerging clean transportation ecosystem,” said Jody Bryson, SCTAC president and chief executive officer.

The Oak Ridge National Laboratory charging system will be co-developed and manufactured by Wytheville, Va.-based Evatran. Other project partners include General Motors, Toyota, Duke Energy and Cisco. The value of the subcontract for Clemson University is $1.52 million.