Inductive battery charger

• US 7,375,493 B2
• Filed: 12/12/2003
• Issued: 05/20/2008
• Est. Priority Date: 12/12/2003
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Mitchell, William, Keely, Leroy B., Calhoon, John Charles
• Primary Examiner(s): Berhane; Adolf
• Assistant Examiner(s): Berhanu; Samuel
• Application Number:
  US10/733,820
• Publication Number:
  US 20050127868A1
• Time in Patent Office: 1,621 Days
• Field of Search: 320/106, 320/108, 320/132, 320/DIG.21, 320/136
• US Class Current: 320/108
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: G06F 21/81 by operating on the power supply, e.g. enabling or disabling power-on, sleep or resume operations
• CPC Class Codes: G06F 2221/2129 Authenticate client device independently of the user
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• 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 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source

Abstract

An inductive charging system transfers energy by inductively coupling a source coil on a power source to a receiver coil for a battery charger. Source current may be received in the battery charger and converted for charging a battery pack. A wireless communication arrangement may also provide for authentication of devices that are allowed by the source to be powered or otherwise charged.

Claims

1. A computer implemented method of providing inductive energy to a battery charger assembly, the method comprising the steps of:

at the battery charger assembly, a coil wirelessly receiving a polling message from an inductive source by listening for the source to alternate between an energized state and a de-energized state at regular intervals, the polling message being received while the battery charger assembly is in a polling listening mode;

transmitting a request for power to the source responsive to receiving the polling message;

receiving inductive power via the coil from the source responsive to the request,

displaying an object on a graphical user interface indicative of the step of receiving for indicating a type of power being received;

outputting a direct current powered by the received inductive power; and

supplying the direct current to a separate battery pack, the battery pack being detachable from the battery charger assembly.

2. The method in accordance with claim 1, in which the step of transmitting includes a step of transmitting a plurality of power parameters to the source.

3. The method in accordance with claim 1, in which the step of transmitting includes a step of transmitting authenticating data to the source.

4. The method in accordance with claim 1, further including a step of converting the inductive power to a direct current responsive to the step of receiving.

5. The method in accordance with claim 1, further including a step of receiving power parameters from a battery pack, and storing the power parameters in a computer readable memory.

6. The method in accordance with claim 5, in which the step of transmitting includes a step of transmitting the power parameters to the source.

7. An energy transfer apparatus, comprising:

a power pickup coil for receiving inductive energy from an inductive power source and for transmitting power to a power supply;

the power supply for receiving power from the power pickup coil and for transmitting power to an electrical load, and operatively connected to a processor unit;

the electrical load for receiving power from the power supply and operatively connected to the processor unit;

the processor unit for processing computer readable data, and operatively connected to the power supply, the electrical load, and a communications unit;

a memory for storing computer readable data relevant to receiving power from an inductive energy source, and operatively connected to the processor unit, and,

the communications unit operatively connected to the processor unit wherein the communications unit includes circuitry for receiving a polling message from the inductive power source, while in a polling listening mode, by listening for the inductive power source to alternate between an energized state and de-energized state at regular intervals, and transmitting a request for power message to the inductive power source.

8. The apparatus in accordance with claim 7, in which the processor unit is configured to provide authentication data for inductive energy reception.

9. The apparatus in accordance with claim 7, in which the processor unit is configured to receive a plurality of power parameters from the battery pack;

store the power parameters in a memory; and

transmit the power requirements to the inductive power source.

10. The apparatus in accordance with claim 8, in which the processor unit is configured to provide a digital certificate to a power source.

11. The apparatus in accordance with claim 7, in which the processor unit is configured to draw electrical power from the battery pack;

and responsive to receiving an indication of inductive energy at the coil;

the processor unit configured to draw electrical power via the coil.

12. The apparatus in accordance with claim 8, further comprising an antenna and a communications device configured to receive the computer readable data and configured to transmit the data to the antenna for wireless data communications to a power source.

13. The apparatus of claim 7, wherein the communication unit transmits a message including a header and a payload to the inductive power source.

14. The apparatus of claim 13 wherein the payload contains specific data relevant to power consumption.

15. The apparatus of claim 13 wherein the payload includes at least one of an operating parameter and authentication information.

16. The apparatus of claim 15 wherein the operating parameter corresponds to a charging voltage or a maximum expected power consumption.

17. The apparatus of claim 7, wherein the electrical load is a battery charger.

18. The apparatus of claim 7, wherein the power pickup coil is operatively connected to the communications unit.

19. The apparatus of claim 7, wherein the electrical load is logically connected to a separate battery pack.

20. An energy receiving apparatus, comprising:

a power pickup coil for receiving inductive energy from an inductive power source and for transmitting power to a power supply;

the power supply operatively connected to a processor unit, said power supply receiving power from the power pickup coil and transmitting power to a battery charging unit;

the battery charging unit receiving power from the power supply to charge a battery unit;

the processor unit operatively connected to the battery charging unit, the power supply, and a communications unit;

said processor unit determining battery charging parameters; and

a memory operatively connected to the processor unit for storing computer readable data including the battery charging parameters;

the communications unit operatively connected to the processor unit and the memory wherein the communications unit includes circuitry for receiving a polling message from the inductive power source, while in a polling listening mode, by listening for the inductive power source to alternate between an energized state and de-energized state at regular intervals, and in response to receiving the polling message, transmitting a request for power message and the battery charging parameters to the inductive power source.

21. The energy receiving apparatus of claim 20, wherein the battery charging parameters are transmitted in response to receiving a request from the inductive power source.