Inductive charging of a rechargeable battery

• US 9,024,576 B2
• Filed: 11/17/2011
• Issued: 05/05/2015
• Est. Priority Date: 11/17/2011
• Status: Active Grant

• Current Assignee: RPX Corporation
• Original Assignee: Nokia Technologies Oy (Nokia Corporation)
• Inventors: Maenpaa, Ossi E.
• Primary Examiner(s): WILLIAMS, ARUN C
• Application Number:
  US13/298,709
• Publication Number:
  US 20130127404A1
• Time in Patent Office: 1,265 Days
• Field of Search: 320/108
• US Class Current: 320/108
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

An apparatus including an inductive charging system and at least one wireless communication system. The inductive charging system is configured to charge a rechargeable battery. The inductive charging system has an induction coil. The at least one wireless communication system is configured to communicate with a device. The wireless communication system includes at least a portion of the induction coil for transmitting and/or receiving a wireless signal at the induction coil, or for generating a communication electromagnetic field at the induction coil. Thus, both the inductive charging system and the wireless communication system include at least a portion of the induction coil as a common component for both of the systems.

Claims

1. An apparatus comprising:

an inductive charging system configured to charge a rechargeable battery, where the inductive charging system comprises an induction coil; and

at least first and second wireless communication systems configured to communicate with respective devices,

the first wireless communication system comprising at least a first portion of the induction coil for transmitting and/or receiving a wireless signal at the induction coil,

the second wireless communication system comprising at least a second portion of the induction coil for generating a communication electromagnetic field at the induction coil,

each of the first and second wireless communication systems shares at least a respective part of the induction coil as a common component with the inductive charging system,

where the first wireless communication system comprises a near field communication (NFC) system configured to use the first portion of the induction coil as a near field communication antenna, and

where the second wireless communication system comprises a hearing aid compatibility (HAC) system configured to generate an electromagnetic field from the induction coil.

2. An apparatus as in claim 1 where the apparatus is configured to use the induction coil at a same time for the induction charging system and the near field communication system.

3. An apparatus as in claim 1 where the first wireless communication system comprises a FM radio receiver configured to use the portion as an FM radio antenna.

4. An apparatus as in claim 1 where the induction coil comprises multiple separate coil loops and circuitry configured to selectively use the separate coil loops.

5. An apparatus as in claim 4 where the circuitry comprises a multiplexer.

6. An apparatus as in claim 4 where the circuitry comprises multiple switchers.

7. An apparatus as in claim 1 further comprising means for selectively using separate coil loops of the induction coil.

8. The apparatus of claim 1, wherein said induction coil is configured to selectively provide different outputs based on whether the electromagnetic field is being generated from the induction coil by the RAC system or the induction coil is being used as a near field communication antenna by the NFC system.

9. A method comprising:

providing an apparatus comprising an inductive charging system configured to charge a rechargeable battery, where the inductive charging system comprises an induction coil; and

providing the apparatus with at least first and second wireless communication systems,

where the first and second wireless communication systems comprise at least first and second portions of the induction coil, respectively,

where the first and second wireless communication systems are configured to use the induction coil to communicate with respective devices,

where the first wireless communication system comprises a near field communication (NFC) system configured to use the first portion of the induction coil as a near field communication antenna, and

where the second wireless communication system comprises a hearing aid compatibility (HAC) system configured to generate an electromagnetic field from the induction coil.

10. A method as in claim 9 where the induction coil is provided as multiple separate coil loops, and the apparatus comprises circuitry configured to selectively use the separate coil loops.

11. The method of claim 9, including configuring the induction coil to selectively provide different outputs based on whether the electromagnetic field is being generated from the induction coil by the HAC system or the induction coil is being used as a near field communication antenna by the NFC system.

12. A method comprising:

using an inductive charging system to charge a rechargeable battery of an apparatus, where the inductive charging system comprises an induction coil; and

using the induction coil as part of a wireless communication system to generate a communication electromagnetic field from the induction coil, and to transmit and/or receive a wireless signal at the induction coil

where the induction coil is used as a coil of a hearing aid compatibility (HAC) system configured to generate the communication electromagnetic field from the induction coil, and

the induction coil is used as a near field communication antenna of a near field communication (NFC) system.

13. A method as in claim 12 where the induction coil is used as the near field communication antenna and the induction coil for the inductive charging system at a same time.

14. The method of claim 12, including selectively providing different outputs from the induction coil based on whether the electromagnetic field is being generated from the induction coil by the HAC system or the induction coil is being used as a near field communication antenna by the NFC system.

15. A non-transitory program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine for performing operations, the operations comprising:

charging a rechargeable battery of an apparatus by an inductive charging system comprises an induction coil;

communicating with a first device by use of the induction coil, where the induction coil generates a communication electromagnetic field from the induction coil; and

communicating with a second device by use of the induction coil, where the induction coil transmits and/or receives a wireless signal at the induction coil.

16. The non-transitory program storage device of claim 15, the operations including selectively providing different outputs based on whether the induction coil generates a communication electromagnetic field from the induction coil or transmits and/or receives a wireless signal at the induction coil.