Multiple-Orientation Wireless Charging

• US 20160308384A1
• Filed: 09/30/2015
• Published: 10/20/2016
• Est. Priority Date: 04/16/2015
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Zhang, Zhuohui, Walley, John Stuart
• Granted Patent: US 9,948,131 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 2310/22 The load being a portable electronic device
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction

Abstract

A system includes a charging station and one or more receiving devices receiving wireless power from the charging station. The charging station includes an orientation adaptable antenna (OAA). The OAA may generate a magnetic field component parallel to the plane of the OAA to charge devices oriented at 90 degrees with respect to the OAA. The OAA may generate a magnetic field along different directions within the plane parallel to the OAA. The OAA may be able to adjust the direction of the field to couple to devices with antennas in different orientations. The OAA may further produce a magnetic field normal to the plane of the OAA. The OAA may adjust the relative strengths the various directional components of the magnetic field to align the field normal to the antennas of the receiving devices in up to three dimensions, simultaneously charge receiving devices in different orientations, or both.

Claims

1. A system comprising:

power signal (PS) circuitry configured to wirelessly transfer energy to a charging device; and

an antenna comprising a plane of traces, the antenna configured to, when driven by the PS circuitry;

generate a first magnetic field component parallel to the plane of traces; and

generate a second magnetic field component parallel to the plane of the traces and oriented in a direction different from that of the first component, the first magnetic field component stronger than the second magnetic field component.

2. The system of claim 1, where the first magnetic field component is oriented normal to an antenna plane of the charging device.

3. The system of claim 2, where the antenna plane of the charging device is oriented orthogonally to the plane of the traces.

4. The system of claim 1, where the PS circuitry comprises a transceiver configured to establish a data communication link with the charging device.

5. The system of claim 4, where the transceiver configured to receive a status message comprising a field coupling indicator for the charging device over the data communication link.

6. The system of claim 5, where the PS circuitry is configured to adjust a ratio of the first and second magnetic field components to adjust the field coupling responsive to the status message.

7. The system of claim 1, where the PS circuitry is configured to determine a field coupling for the charging device by measuring a load of the antenna.

8. The system of claim 1, where:

the antenna is configured to generate a third magnetic field component normal to the plane of the traces when an antenna plane of the charging device is oriented parallel to the plane of the traces.

9. The system of claim 1, where the traces comprise:

first parallel traces aligned along a first direction, the first parallel traces configured to, when driven by the PS circuitry, generate the first magnetic field component; and

second parallel traces aligned along a second direction, the second parallel traces configured to, when driven by the PS circuitry, generate the second magnetic field component, the second direction different from the first.

10. The system of claim 9, where the first direction is orthogonal to the second direction.

11. The system of claim 9, where the first parallel traces are interconnected via first return lines, a length of the first return lines configured to enforce a phase relationship among the first parallel traces, when the first parallel traces are driven by the CS circuitry.

12. The system of claim 11, where the return lines are separated from the first parallel traces by a magnetic shielding layer.

13. The system of claim 1, further comprising a magnetic shield, the magnetic shield configured to:

cover a first portion of the plane of traces; and

expose a second portion of the plane of traces.

14. The system of claim 1, where:

the plane of traces comprises multiple macroblocks; and

the PS circuitry is configured to;

activate a first macroblock; and

forgo activation of a second macroblock when the first macroblock is coupled to an antenna of the charging device more strongly than the second macroblock.

15. A method comprising:

coupling energy wirelessly from a charging station (CS) to a charging device by;

driving a first trace of a CS antenna to generate first and second field components of a magnetic field, the first and second field components parallel to the CS antenna; and

driving a second trace of the CS antenna to adjust a signal ratio between the first and second field components to control coupling between the magnetic field and a charging device antenna.

16. The method of claim 15, where driving the second trace of the CS antenna to adjust the signal ratio between the first and second field components comprises:

receiving feedback from the charging device, the feedback indicating the coupling between the charging device antenna and the magnetic field; and

responsive to the feedback, changing a driving current of the first trace, the second trace, or both.

17. The method of claim 16, where receiving feedback comprises receiving coupling data over a communication link between the charging device and the CS, a reflected load of the charging device antenna, or both.

18. A system comprising:

an antenna configured to couple energy wirelessly to a charging device, the antenna comprising;

a first trace configured to, when driven;

emit a first magnetic field component along a first direction; and

emit a second magnetic field component along a second direction, the second direction orthogonal to the first; and

a second trace configured to, when driven, emit a third magnetic field component that cancels a portion of the second magnetic field component to align a total magnetic field along the first direction; and

power signal (PS) circuitry coupled to the antenna, the PS circuitry configured to drive the antenna to wirelessly charge the charging device.

19. The system of claim 18, where:

the first and second traces are aligned parallel to one another;

the first direction is orthogonal to the first and second traces; and

the second direction is parallel to the first and second traces.

20. The system of claim 18, further comprising:

a return trace coupled to the first and second traces, the return trace configured to pass a driving signal from the first trace to the second trace; and

a magnetic shield configured to separate the first and second traces from the return trace.