Apparatuses having different modes of operation for inductive wireless power transfer and related method

• US 9,837,203 B2
• Filed: 03/29/2012
• Issued: 12/05/2017
• Est. Priority Date: 03/29/2012
• Status: Active Grant

• Current Assignee: Integrated Device Technology Incorporated (Renesas Electronics Corporation)
• Original Assignee: Integrated Device Technology Incorporated (Renesas Electronics Corporation)
• Inventors: Singh, Manjit
• Primary Examiner(s): Grant, Robert
• Assistant Examiner(s): McDaniel, Tynese
• Application Number:
  US13/434,658
• Publication Number:
  US 20130257360A1
• Time in Patent Office: 2,077 Days
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• 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 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

An inductive wireless power enabled device may comprise a transceiver including a plurality of switches coupled with a resonant tank, and control logic configured to drive the plurality of switches to operate the resonant tank in one of a transmit mode and a receive mode. Another inductive wireless power enabled device may comprises a transceiver including a plurality of switches coupled with a resonant tank. The transceiver may be configured to both transmit a wireless power signal through the resonant tank and generate power from an incoming wireless power signal through the resonant tank depending on a current operational mode. A related method for operating a wireless power enabled device according to either a transmit mode or a receive mode is also disclosed.

Claims

1. A first inductive wireless power enabled device coupled to a first battery, comprising:

a transceiver including a full-bridge circuit operable as a full-bridge inverter and a full-bridge rectifier, the full-bridge circuit including a plurality of first switches coupled in a full-bridge configuration with a resonant tank circuit, wherein the transceiver is coupled to the first battery through a second switch;

a charger coupled between the transceiver and the first battery through a third switch, wherein the charger is arranged in parallel with the second switch; and

control logic configured to;

detect a presence of a second inductive wireless power enabled device coupled to a second battery;

determine which of the first and second batteries has a higher remaining charge;

while the first battery has the higher remaining charge, drive the plurality of first switches to operate the resonant tank circuit in a transmit mode, close the second switch, and open the third switch; and

while the second battery has the higher remaining charge, drive the plurality of first switches to operate the resonant tank circuit in a receive mode, open the second switch, and close the third switch.

2. The first inductive wireless power enabled device of claim 1, wherein the control logic is configured to operate the full-bridge circuit as the full-bridge inverter during the transmit mode and as the full-bridge rectifier during the receive mode.

3. The first inductive wireless power enabled device of claim 1, wherein the resonant tank circuit includes at least one capacitor and at least one inductive coil of an LC network.

4. The first inductive wireless power enabled device of claim 3, wherein the at least one capacitor and the at least one inductive coil are serially coupled.

5. The first inductive wireless power enabled device of claim 1, further comprising a load operably coupled with the transceiver to receive power from the transceiver during the receive mode.

6. The first inductive wireless power enabled device of claim 5, wherein the load includes the first battery.

7. The first inductive wireless power enabled device of claim 5, wherein the load includes system components of the first inductive wireless power enabled device.

8. A first battery-powered inductive wireless power enabled device, comprising:

a transceiver including a full-bridge circuit operable as a full-bridge inverter and a full-bridge rectifier, the full-bridge circuit including a plurality of first switches coupled in a full-bridge configuration with a resonant tank circuit, wherein the transceiver is configured to drive the plurality of first switches to transmit a wireless power signal through the resonant tank circuit when operating in a transmit mode and generate power from an incoming wireless power signal through the resonant tank circuit when operating in a receive mode;

an energy storage device coupled to the transceiver through a second switch; and

a charger coupled between the transceiver and the energy storage device through a third switch, wherein the charger is arranged in parallel with the second switch,

wherein;

the transceiver operates in the transmit mode, the second switch is closed, and the third switch is opened when, in a presence of a second battery-powered inductive wireless power enabled device, it is determined that the first battery-powered inductive wireless power enabled device has more remaining battery charge than the second battery-powered inductive wireless power enabled device; and

the transceiver operates in the receive mode, the second switch is opened, and the third switch is closed when, in the presence of the second battery-powered inductive wireless power enabled device, it is determined that the second battery-powered inductive wireless power enabled device has more remaining battery charge than the first battery-powered inductive wireless power enabled device.

9. The first battery-powered inductive wireless power enabled device of claim 8, wherein the charger is selected from the group consisting of a switching regulator and a linear regulator.

10. The first battery-powered inductive wireless power enabled device of claim 8, further comprising a mobile electronic device that includes the transceiver.

11. The first battery-powered inductive wireless power enabled device of claim 10, wherein the mobile electronic device is selected from the group consisting of a cell phone, a smart phone, a tablet computer, a laptop computer, an electronic reader, a personal digital assistant, a camera, and a media player.

12. The first battery-powered inductive wireless power enabled device of claim 8, wherein the plurality of first switches are configured to be independently driven by control signals to generate an AC current through the resonant tank circuit from a DC input signal during the transmit mode, and to generate a DC output signal from an AC current generated in the resonant tank circuit during the receive mode.

13. The first battery-powered inductive wireless power enabled device of claim 12, wherein the DC output signal, when generated, is received by the energy storage device.

14. The first battery-powered inductive wireless power enabled device of claim 13, wherein the DC output signal, when generated, flows through the charger via the third switch.

15. The first battery-powered inductive wireless power enabled device of claim 14, wherein closing the second switch enables the energy storage device to provide power to the transceiver during the transmit mode.

16. The first battery-powered inductive wireless power enabled device of claim 14, further comprising an adaptor port that is coupled with the transceiver through a fourth switch that enables an adaptor to provide power to the transceiver during the transmit mode.

17. A method for operating a first wireless power enabled device coupled to a first energy storage device through a first switch, the method comprising:

detecting a presence of a second wireless power enabled device coupled to a second energy storage device;

determining which of the first and second energy storage devices has a higher remaining charge;

while the first energy storage device has the higher remaining charge, operating the first wireless power enabled device in a transmit mode and closing the first switch, wherein during the transmit mode, a wireless power signal is transmitted through a resonant tank circuit of the first wireless power enabled device by operating a full-bridge circuit as a full-bridge inverter to transmit power; and

while the second energy storage device has the higher remaining battery charge, operating the first wireless power enabled device in a receive mode, opening the first switch, and closing a second switch to electrically couple the first wireless power enabled device to the first energy storage device through a charger arranged in parallel with the first switch, wherein during the receive mode, an output power signal is generated responsive to receiving an incoming wireless power signal through the resonant tank circuit of the first wireless power enabled device by operating the full-bridge circuit as a full-bridge rectifier to receive power.

18. The method of claim 17, wherein the outpt power signal, when generated, flows through the charger.

19. The method of claim 17, wherein the charger is selected from a group consisting of a switch regulator and a linear regular.

20. The method of claim 17, wherein wherein the resonant tank circuit includes at least one capacitor and at least one inductive coil of an LC network.

21. The method of claim 20, wherein the at least one capacitor and the at least one inductive coil are serially coupled.

22. The method of claim 17, wherein operating the full-bridge circuit as the full-bridge inverter includes driving a plurality of switches coupled with the resonant tank circuit during the transmit mode to generate an AC current through the resonant tank circuit.

23. The method of claim 22, wherein operating the full-bridge circuit as the full-bridge rectifier includes driving the plurality of switches coupled with the resonant tank circuit during the receive mode to receive an AC current generated by the resonant tank circuit and generate a DC current.