Docket #: S15-332
Wireless Power Transfer
Stanford researchers developed a wireless power transfer mechanism that will charge devices while on the move, or in use. The mechanism uses a parity-time symmetric circuit incorporating a nonlinear gain saturation element. Efficiency and power transfer are constant over varying range without tuning - enabling wireless 'on the go' charging. Consumer, medical, and industrial electronics will be more robust, reliable, convenient, and safer through the elimination of cables, wires and battery replacement.
![](https://web.stanford.edu/group/OTL/lagan/15322/fig1.jpg)
Stage of Research - Prototype
Researchers have verified theory with experiments on a radio frequency circuit. Research is ongoing.
Applications
- Wireless power transfer to electric vehicles while in use.
- Wireless power transfer to portable electronics – devices can be wirelessly charged while in use.
- Ideal for devices used in harsh or hazardous environments.
Advantages
- Constant transferred power level over a range.
- Convenient charging on the go could increase EV effective driving range and EV adoption.
- Increased mobility and safety for patients with implantable medical devices, neurostimulators.
- Handheld medical instruments, and diagnostic equipment can be charged on the go, eliminating need for cables, and stationary charging.
- More convenient, reliable, automatic charging and direct wireless power for: mobile phones, handheld devices, printers, displays, robots, cordless tools and instruments.
- Increased design flexibility and robustness for thinner, waterproof devices - eliminates failure prone wiring, complex docking and battery replacement.
Publications
- ANDREWS, EDMUND L. Stanford researchers one step closer toward enabling electric cars to recharge themselves wirelessly as they drive, Stanford News, 4 May 2020.
- S. Assawaworrarit, X. Yu, S. Fan. Robust wireless power transfer using a nonlinear parity-time symmetric circuit, Nature 546 (2017), 387-390.
- Wirelessly Transmitting Electricity, Stanford Enginnering News, 15 June 2017.
- Mark Golden and Mark Shwartz, Wireless charging of moving electric vehicles overcomes major hurdle in new Stanford research, Stanford News, 14 June 2017.
- Shwartz, Mark. Wireless power could revolutionize highway transportation, Stanford researchers' say (2012).
Related Links
Patents
- Published Application: 20180241252
- Issued: 10,931,146 (USA)
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