Scientists have developed a strategy that allows for transferring power wirelessly through multiple transmitter coils with maximum efficiency
Wireless power transfer has proven to be quite useful in electronic devices such as medical implants and smartphones. In most cases, this is done by aligning or “coupling” two separate coils of wire (transmitter Tx and receiver Rx). The electrical current circulating in the Tx coil then creates a magnetic field that transfers energy to the Rx coil. Recently, the use of multiple Txs has been explored, which can cover a wide charging area.
However, although methods for transferring power wirelessly with maximum efficiency have been studied in great detail in single-Tx systems, the same is not true for systems with multiple Tx coils. Maximizing efficiency in the multi-Tx problem is challenging because the Rx could be located anywhere over the surface covered by the Txs, leading to stronger coupling with some and negligible coupling with others. To date, there have been no control schemes that can optimize the currents delivered to each Tx in real time — until now.
In a study published in IEEE Transactions on Power Electronics, scientists at Incheon National University, Korea, devised an effective control strategy for maximizing efficiency in multi-Tx wireless charging. They first formulated a theoretical background and found important relationships between many variables in the problem, such as the connection between the degree of coupling of each Tx to the Rx, its “perceived” or “reflected” impedance from the Rx, and the optimal current that should be fed.
With this knowledge, the researchers implemented a novel, maximally efficient, and relatively simpler method for multi-Tx wireless charging. “Our strategy breaks away from the more traditional approach of locating the Rx with a position sensor and only turning on the Tx closest to it,” explains Professor Dukju Ahn, “Instead, we found that the coupling degree of each Tx can be measured indirectly in real time through its impedance, allowing us to dynamically adjust the output of each Tx coil to achieve maximum efficiency.”
Prof Ahn also stated that although other techniques have been previously published, their performance was assessed by having the Rx stand still on different locations. “Wireless charging technology is aimed for applications involving moving receivers. In this sense, our work is the first to verify the efficiency of a multi-Tx control scheme compatible with a receiver that’s actually moving in real time,” he remarks.
Wireless charging technology will help remove the hurdles of wired power supplies in many applications. With efficient multi-Tx wireless power transfer, we might be able to do away with the large and heavy batteries that current electric vehicles and industrial robots use, making them cheaper and easier to move.
Let us hope this study energizes further research in this field!
The Latest Updates from Bing News & Google News
Go deeper with Bing News on:
- Satechi opens preorders for 2-in-1 iPhone 12 magnetic charging standon January 12, 2021 at 8:49 am
News Highlights: Satechi opens preorders for 2-in-1 iPhone 12 magnetic charging stand The Satechi Magnetic 2-in-1 Wireless Charging Stand will complement ...
- This Aukey portable wireless charger is a steal at under $40on January 12, 2021 at 8:23 am
Amazon is selling the Aukey 20,000mAh portable wireless charger for $36.33 Remove non-product link, down from $46 and matching the lowest price we've ever seen. To get the deal you need to clip the 10 ...
- CES 2021: Satechi Launches 2-in-1 Magnetic Wireless Charging Standon January 12, 2021 at 6:00 am
Magnetic Wireless Charging Stand, which is designed to work with the magnets inside Apple's iPhone 12 lineup. Though the charging stand includes magnets, it is not MagSafe and it is limited to ...
- Video: Panasonic to bring wireless charging to every vehicleon January 12, 2021 at 5:49 am
Panasonic has introduced two variants to its in-vehicle wireless charging technology that can be used in any vehicle. The variants — moving coil and static coil — provide in-vehicle charging that meet ...
- Panasonic shows off wireless device charging and HUD vehicle tech at CES 2021on January 12, 2021 at 4:47 am
Panasonic Automotive has unveiled new vehicle technology at CES 2021. The company has two variants of new in-vehicle wireless charging technology utilizing moving coil and static coil. Both ...
Go deeper with Google Headlines on:
Go deeper with Bing News on:
Transferring power wirelessly
- TV without cords - new freedom for your home and work spaceson January 12, 2021 at 8:22 am
Many electronics manufacturers strive for the better user's experience and comfort. One of such efforts is to make devices ...
- FineHeart Successfully Tests the Implantable, Wireless Transcutaneous Energy Transfer (TET) System for Powering Its ICOMS Heart Pumpon January 12, 2021 at 5:29 am
FineHeart, SA, a preclinical-stage medical device company developing an Implantable Cardiac Output Management System (ICOMS) to address the unmet need ...
- Engineers Race to Develop Wireless Charging Technologyon January 11, 2021 at 12:30 pm
One of the stumbling blocks to widespread acceptance of electric vehicles is a recharging infrastructure that’s convenient, easy to use, fast and readily accessible.
- Samsung mmWave 5G TCU to power in vehicle technologyon January 10, 2021 at 11:33 pm
Samsung has revealed that its new mmWave 5G TCU will be used to power in vehicle technology, for things like safety solution, self driving technology and ...
- Medigus Enters the Wireless Charging Market for Electric Vehicle with New Autonomous Technologyon January 8, 2021 at 5:14 am
Medigus Ltd., a technology company engaged in advanced medical solutions and innovative internet technologies, announced today the expansion of its electric vehicle operations with a purchase ...