Wireless battery charging

• US 7,471,062 B2
• Filed: 06/12/2002
• Issued: 12/30/2008
• Est. Priority Date: 06/12/2002
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Bruning, Gert W.
• Primary Examiner(s): TSO, EDWARD H
• Application Number:
  US10/170,034
• Publication Number:
  US 20030231001A1
• Time in Patent Office: 2,393 Days
• Field of Search: 320/108, 320/112, 320/106, 320/110, 320/113, 320/114, 320/101, 320/145, 320/162, 320/103, 320/109, 320/137, 320/140, 307/18, 307/19, 307/20, 307/46, 307/150, 307/43, 307/66, 307/414, 323/906, 136/243, 136/244
• US Class Current: 320/108
• 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 50/10 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 7/342 The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging with circuits for polarity protection H02J7/0034
• CPC Class Codes: H02J 7/35 with light sensitive cells

Abstract

Batteries in portable electrical or electronic devices are charged, through by a wireless battery charger, having an intermediate electrical energy storage device that is charged from a non-power line connected source, and discharged to recharge the battery of a portable device placed into a charge port of the wireless battery charger. The non-power line connected source may be a solar cell for converting light impinging on the solar cell into electrical energy. The non-power line connected source may also be a fuel cell for converting a fuel into electrical energy. The wireless battery charger may also include multiple sources, such as both a solar and a fuel cell. Charging the intermediate electrical energy storage device from the non-power line connected source may take place over an extended period of time having a duration longer than the time required to charge the battery of the portable device. The wireless battery charger and portable device may include transformer elements that allow the battery of the portable device to be re-charged by magnetic induction, without the need for electrical contacts in either the charger port or on the portable device.

Claims

1. An apparatus for charging a battery in a portable device, the apparatus comprising:

a non-power-line-connected source of electrical charge;

an intermediate storage device for storing the electrical charge to serve as a primary source for recharging the battery in the portable device;

a source charger/converter for charging the intermediate storage device with an electrical charge received from the non-power-line-connected source; and

a transfer charger/converter for delivering the stored electrical charge from the intermediate storage device to the battery in the portable device, wherein the source charger/converter transfers the electrical charge to the intermediate storage device over an extended period of time that is longer in duration than a period of time required for delivering the stored electrical charge to the battery of the portable device.

2. The apparatus of claim 1 wherein the intermediate storage device includes a battery.

3. The apparatus of claim 1 wherein the source charger/converter includes a direct current to direct current (DC/DC) converter.

4. The apparatus of claim 1 wherein the non-power-line-connected source includes a solar cell for converting light energy into the electrical charge.

5. The apparatus of claim 1 wherein the non-power-line-connected source includes a fuel cell for generating the electrical charge.

6. The apparatus of claim 1 wherein the transfer charger/converter includes an electrical connector adapted to receive and establish an electrical connection with a mating electrical connector on the portable device, for delivering the stored electrical charge to the battery of the portable device.

7. The apparatus of claim 1 wherein the stored electrical charge is delivered to the battery of the portable device without the use of an electrical connection between the intermediate storage device and the portable device.

8. The apparatus of claim 7 wherein the transfer charger/converter includes elements for generating an alternating current from the stored charge, a transformer, and elements for converting alternating current to direct current, for delivering the stored electrical charge from the intermediate storage device to the battery of the portable device by magnetic induction.

9. The apparatus of claim 1 wherein the source charger/converter includes elements for receiving the electrical charge from the source without the use of an electrical connection between the intermediate storage device and the portable device.

10. The apparatus of claim 1 further including both a solar cell and a fuel cell as non-power-line-connected sources of the electrical charge.

11. A method for charging a battery in a portable device, the method comprising:

charging an intermediate storage device with an electrical charge received from a non-power-line-connected source;

storing the electrical charge in the intermediate storage device as a primary source for recharging the battery in the portable device; and

delivering the stored electrical charge from the intermediate storage device to the battery in the portable device, wherein said charging the intermediate storage device with the electrical charge over an extended period of time that is longer in duration than a period of time required for delivering the stored electrical charge to the battery of the portable device.

12. The method of claim 11 wherein the intermediate storage device includes a battery, and the method further comprises performing a DC/DC conversion of the electrical charge.

13. The method of claim 11 wherein the non-power-line-connected source includes a solar cell and the method further comprises converting light energy impinging on the source into the electrical charge.

14. The method of claim 11 wherein the non-power-line-connected source includes a fuel cell and the method further comprises converting fuel in the fuel cell into the electrical charge.

15. The method of claim 11 further including establishing an electrical connection between the intermediate storage device and the portable device, for delivering the stored electrical charge to the battery of the portable device.

16. The method of claim 11 further comprising delivering stored electrical charge to the battery of the portable device without the use of an electrical connection between the intermediate storage device and the portable device.

17. The method of claim 16 further comprising delivering the stored electrical charge from the intermediate storage device to the battery of the portable device by magnetic induction.

18. The method of claim 11 wherein the apparatus further includes both a solar and a fuel cell as non-power-line connected sources of electrical charge and the method includes charging the intermediate storage device with an electrical charge received from at least one of the solar and fuel cell sources.

19. An apparatus for charging a battery in a portable device, the apparatus comprising:

a non-power-line-connected generator of electrical charge,

an intermediate storage device for storing an electrical charge,

means for charging the intermediate storage device with the electrical charge received from the non-power-line-connected source; and

means for delivering the stored electrical charge from the intermediate storage device to the battery in the portable device as a primary source for recharging the battery in the portable device,

wherein the non-power-line connected generator of electrical charge, the intermediate storage device, the means for charging the intermediate device, and the means for delivering the stored electrical charge are all provided in a common encasing, and wherein the means for charging transfers the electrical charge to the intermediate storage device over an extended period of time that is longer in duration than a period of time required for delivering the stored electrical charge to the battery of the portable device.

20. The apparatus of claim 19 further comprising means for delivering the stored electrical charge from the intermediate storage device to the battery of the portable device by magnetic induction.