# US 2018/0323637 A1 · Adaptive control of wireless power transfer

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- Number: US 2018/0323637 A1
- Document ID: US20180323637A1
- Status: Published application
- Kind: A1
- Application number: 15/869,652
- Filed: 2018-01-12
- Published: 2018-11-08
- Earliest claimed: 2014-12-31
- Assignees: Massachusetts Institute of Technology
- Applicants: Massachusetts Institute of Technology
- Inventors: Dina Katabi; Lixin Shi; Zachary Edward Kabelac
- Web page: https://patentgrep.com/patent/US20180323637A1

## CPC

- H02J 50/402: {the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas}
- H02J 7/94: in response to battery current
- H02J 50/12: of the resonant type
- H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
- H04B 5/26: using coils
- H04B 5/79: for data transfer in combination with power transfer
- H02J 7/933: {the cycle being controlled or terminated in response to electric parameters}
- H02J 50/90: involving detection or optimisation of position, e.g. alignment
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H04B: TRANSMISSION

## Abstract

A method for wireless power transfer adapts to changing configuration of receivers, including changes in number of, location and/or orientiation of, magnetic coupling to, and load of circuits (e.g., battery charging circuits) of one or more receivers. The adaptation can be performed without interrupting optimal or near-optimal power transfer to the receivers, and can provide a measure of fairness among multiple receivers.

## Claims

### Claim at position 1

-34. (canceled)

### Claim 35

A method for wireless power transmission comprising:
wirelessly transmitting power from a base station including a plurality of transmitting coils to a plurality of receivers including a corresponding plurality of receiver coils, the wireless transmission of power including adapting a plurality of driving signals for driving the transmitting coils according to a plurality of magnetic channel characteristics characterizing a plurality of magnetic channels between the transmitting coils and the receiver coils; and
without interruption of the wireless transmission of power,
inferring changes in the magnetic channels between the transmitting coils and the receiver coils, and
updating the plurality of magnetic channel characteristics according to the inferred changes in the magnetic channels between the transmitting coils and the receiver coils.