Power transmitting device having device discovery and power transfer capabilities

• US 9,601,930 B2
• Filed: 09/28/2012
• Issued: 03/21/2017
• Est. Priority Date: 09/28/2012
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Walley, John, Van Der Lee, Reinier, Rajakarunanayake, Yasantha, Bishtein, Vadim
• Primary Examiner(s): Hsieh, Ping
• Assistant Examiner(s): Yang, James
• Application Number:
  US13/631,185
• Publication Number:
  US 20140094116A1
• Time in Patent Office: 1,635 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00036 Charger exchanging data with battery
• CPC Class Codes: H02J 7/00047 with provisions for charging different types of batteries

Abstract

A wireless power transfer system is described that includes a power station and a chargeable device. The power station transmits discovery beacons in order to detect a chargeable device within its vicinity using any available communication protocols and/or standards. Once a device is discovered, the power station can perform coil selection with the device in order to select preferred coils for power transfer. In addition, the chargeable device is capable of detecting the beacon signal and providing a response to notify the power station of its presence. The chargeable device is capable of performing its own coil selection for further optimization and includes various assistance functionality to aid a user in optimizing a connection with the power station.

Claims

1. A power station capable of wireless power transfer (WPT) within a WPT environment, the power station comprising:

a communication module configured to transmit and receive signals of a first communication protocol to and from the environment;

a coil module that includes a plurality of coils;

a coil driving module configured to drive the plurality of coils with WPT signals using WPT communication that is different from the first communication protocol; and

a load detection module configured to detect signals loaded onto the coils from the environment,

wherein a response signal is received from the environment in response to a transmitted beacon signal via at least one of the communication module and the coil module, and

wherein the coil driving module is configured to drive more than one of the plurality of coils with the beacon signal simultaneously so as to transmit the beacon signal to the environment via magnetic coupling of the more than one of the plurality of coils.

2. The power station of claim 1, wherein the communication module is configured to transmit the beacon signal to the environment using at least one of a frequency-hopping spread spectrum communication, WLAN, and NFC communication.

3. The power station of claim 1, wherein the coil driving module is configured to drive each of the plurality of coils simultaneously with the beacon signal so as to transmit the beacon signal to the environment.

4. The power station of claim 1, wherein the coil module includes an outer coil that overlaps with at least two of the plurality of coils, and

wherein the coil driving module drives the outer coil with the beacon signal so as to transmit the beacon signal to the environment.

5. The power station of claim 1, wherein the beacon signal is transmitted to the environment in sequentially one of:

different standards, different duty cycles, and different transmission powers.

6. The power station of claim 1, wherein the beacon signal is a universal beacon signal with a predetermined packet layout.

7. The power station of claim 1, wherein the beacon signal is periodically transmitted using a first WPT communication scheme and periodically transmitted in a second WPT communication scheme, wherein the frequencies of the respective transmissions are based on a popularity of the first and second WPT communication schemes.

8. The power station of claim 1, wherein each of the more than one of the plurality of coils are adjacent to another of the more than one of the plurality of coils.

9. A method for establishing communication with a nearby chargeable device by a power station, the method comprising:

transmitting a beacon signal to the chargeable device by driving more than one of a plurality of coils with the beacon signal simultaneously so as to transmit the beacon signal via magnetic coupling of the more than one of the plurality of coils;

receiving a response signal from the chargeable device in response to the beacon signal;

performing a coil selection procedure based on a proximity of the chargeable device to the power station, the proximity being determined based on the response signal; and

selecting one or more coils from among the plurality of coils for transmitting wireless power signals to the chargeable device based on the coil selection.

10. The method of claim 9, wherein the beacon signal is transmitted to the chargeable device using sequentially different communication standards,

wherein the plurality of coils transmit the beacon signal in a first one of the communication standards, and

wherein a radio transmits the beacon signal in a second one of the communication standards.

11. The method of claim 10, wherein the first one of the communication standards is a load modulation wireless power transfer (WPT) standard, and

wherein the second one of the communication standards is one of a frequency-hopping spread spectrum communication, WLAN or NFC.

12. The method of claim 9, wherein the coil selection procedure includes transmitting a signal from each of the plurality of coils and receiving a coil preference signal from the chargeable device in response to the transmission of the signal.

13. The method of claim 9, wherein the coil selection procedure includes receiving a signal on each of the plurality of coils from the chargeable device and calculating coupling coefficients for each of the plurality of coils based on signal characteristics of the corresponding received signals.

14. The method of claim 9, wherein the beacon signal identifies wireless power transfer (WPT) communication schemes supported by the power station, and

wherein the response signal identifies WPT communication schemes supported by the chargeable device.

15. A power station capable of wireless power transfer (WPT) within a WPT environment, the power station comprising:

a communication module configured to transmit and receive signals of a first communication protocol to and from the environment, and configured to transmit a beacon signal identifying available communication protocols of the power station that include the first communication protocol of the power station, the beacon signal being transmitted to the WPT environment without a designated recipient;

a coil module that includes a plurality of coils;

a coil driving module configured to drive the plurality of coils with WPT signals using WPT communication that is different from the first communication protocol; and

a load detection module configured to detect signals loaded onto the plurality of coils from the environment,

wherein a response signal is received from the environment in response to the beacon signal in accordance with a communication protocol from among the available communication protocols.