Qualcomm Incorporated

Witricity Corpoation

Mei-Li Chi

William Henry Von Novak, Iii

Francesco Carobolante

Seong Heon Jeong

Charles E Wheatley, Iii

Ryan Tseng

David George Fern

Joseph Maalouf

Sumukh Shevde

Arvind Govindaraj

Curtis Gong

Michael Antar

Kelsey Burrell

Saeed Nejatali

Ryan Mills

Fang Han

Iii William Henry Von Novak

Iii Charles Edward Wheatley

William Henry Iii Von Novak

An apparatus for wirelessly transferring charging power is provided. The apparatus comprises a coupler configured to generate a wireless field when driven with a time-varying current. The apparatus comprises a measurement circuit configured to determine a parasitic capacitance between the coupler and ground while the coupler generates the wireless field. The apparatus comprises a controller circuit configured to determine a presence of a foreign object in response to the determined parasitic capacitance satisfying a detection criteria. The detection criteria may comprises a time-varying pattern of the determined parasitic capacitance predetermined to correspond to presence of a presence of the foreign object. The detection criteria may also comprises a threshold change in the determined parasitic capacitance predetermined to correspond to presence of a presence of the foreign object.

Methods and apparatus for implementing presence and usage pattern detection in wireless charging applications

Techniques for detecting the presence of a magnetic field associated with a wireless electric vehicle charging (WEVC) system are disclosed. An example of an apparatus for alerting a user of the presence of a magnetic field according to the disclosure includes a mobile device and at least one magnetic flux sensor integrated as part of the mobile device or operably coupled to the mobile device, the at least one magnetic flux sensor configured to detect the presence of the magnetic field associated with a wireless electric vehicle charging system, the mobile device configured to generate an alert based on the presence of the magnetic field detected by the at least one magnetic flux sensor.

Methods for warning of electromagnetic fields produced by wireless electric vehicle charging systems

A method and system for providing wireless power transfer through a metal object is provided. In one aspect, an apparatus for wirelessly receiving power via a magnetic field is provided. The apparatus includes a metal cover including an inner portion and an outer portion. The outer portion is configured to form a loop around the inner portion of the metal cover. The outer portion is configured to inductively couple power via the magnetic field. The apparatus includes a receive circuit electrically coupled to the outer portion and configured to receive a current from the outer portion generated in response to the magnetic field. The receive circuit is configured to charge or power a load based on the current.

Wireless power transfer through a metal object

Certain aspects of the present disclosure relate to methods and apparatus for reconfiguring wireless power resonator. Certain aspects of the present disclosure provide a wireless power resonator. The wireless power resonator includes a first section. The wireless power resonator further includes a second section electrically coupled and physically coupled to the first section. The second section is configured to be movable with respect to the first section while remaining both electrically coupled and physically coupled to the first section to change an effective area of the wireless power resonator.

Reconfigurable wireless power resonator

A uniform magnetic field may provide better performance in wireless power transmitters due to smaller impedance variations in an output of a power amplifier of a wireless power transmitter and also allow for wireless power transmitter pads to be thinner. One aspect of the disclosure provides a device for wireless power transfer. The device comprises a substantially planar transmit antenna that is configured to generate a magnetic field. The device also comprises a pad having a charging surface. At least a portion of the transmit antenna is disposed in the pad. The device also comprises a ferromagnetic material having a shape and a position relative to the transmit antenna. At least one of the shape or position of the ferromagnetic material, or a combination thereof, is selected to modify a distribution of the magnetic field at the charging surface.

Systems and methods for adjusting magnetic field distribution using ferromagnetic material

An apparatus comprises a first driver circuit having a first output impedance while driving a plurality of couplers with a first current having a first phase to generate a wireless field. A second driver circuit drives the plurality of couplers with a second current having a second phase. A controller causes the second driver circuit to sequentially drive each of the plurality of couplers with the second current while causing the first driver circuit to simultaneously drive the other couplers with the first current. The controller identifies a subset of the plurality of couplers based on detecting a change from the first output impedance in response to each of the plurality of couplers being sequentially driven with the second current. The controller selectively energizes the subset of the plurality of couplers via one or both of the first and second driver circuits to wirelessly transfer the charging power.

Method and apparatus for wireless power transfer utilizing transmit coils driven by phase-shifted currents

This disclosure provides methods and apparatus for wireless power field testing. A method for generating testing the interoperability of a wireless power transmitter with one or more wireless power receivers is provided. The method includes generating a magnetic field via a transmit antenna. The method further includes measuring a first uniformity of the magnetic field at all the locations within the magnetic field on a charging surface of the wireless power transmitter. The method also includes determining that the measure first uniformity of the magnetic field is within a range of values at all locations on the charging surface of the wireless power transmitter. In some implementations, the method further includes applying a load to the magnetic field, measuring a second uniformity of the magnetic field while the load is applied, and determining if the first uniformity of the magnetic field is substantially similar to the second uniformity.

Methods and apparatus for testing of wireless power transmitters and systems

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San Diego, CA, United States of America

Mei-Li Chi