Adaptive charger system and method

• US 8,183,827 B2
• Filed: 01/28/2003
• Issued: 05/22/2012
• Est. Priority Date: 01/28/2003
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Lyon, Geoff M.
• Primary Examiner(s): Tso, Edward
• Application Number:
  US10/353,540
• Publication Number:
  US 20040145342A1
• Time in Patent Office: 3,402 Days
• Field of Search: 320/108, 320/107, 320/109, 320/139, 320/106, 336/DIG.2
• US Class Current: 320/108
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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 7/00 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

A method and apparatus is used for adaptive inductive charging of a device. Charging includes detecting the presence of a device capable of receiving an inductive charge, determining a set of parameters for inductively charging the device, and transmitting an inductive charge corresponding to the set of parameters for charging the device. Another aspect of charging includes combining at least two inductive fields transmitted at different angles to each other, delivering the combined inductive field at an orientation to the device, measuring the load on the device to determine the effectiveness of the orientation of the inductive field when charging the device, and charging the device at the orientation of the inductive field when the measured load on the device exceeds a threshold load level.

Claims

1. A method of adaptively charging a device, comprising:

detecting the presence of a device capable of receiving an inductive charge;

determining a set of parameters for charging the device through induction,

wherein the determined set of parameters affects an amount of power on a primary coil that provides the inductive charge; and

transmitting the inductive charge from the primary coil to the device for charging the device, wherein determining a set of parameters includes

varying combinations of the parameters for charging the device during a time interval;

measuring a load of the device for each of the various combinations of the parameters; and

selecting one of the various combinations of the parameters based on the measured load of the device.

2. The method of claim 1 further comprising,

terminating the transmission of the inductive charge once the device is adequately charged.

3. The method of claim 2 wherein the terminating further comprises:

receiving a signal from the device identifying a level of charge; and

determining the device has completed charging based on the level of charge identified.

4. The method of claim 3 wherein the signal causes a change in the load over a same channel used to charge the device.

5. The method of claim 3 wherein the signal is transmitted over a signal channel separate from a channel used to charge the device.

6. The method of claim 3 wherein the signal is transmitted from the device using radio frequency identification device (RFID) compatible technology.

7. The method of claim 1 wherein the primary coil includes a set of two or more induction coils positioned at different angles from each other.

8. The method of claim 1 wherein selecting one of the various combinations of the parameters includes selecting a combination of the parameters that provides a largest load in the primary coil.

9. The method of claim 8 wherein at least one of the parameters is selected from a set of parameters including a phase, an amplitude, and a frequency of an inductive field.

10. The method of claim 1 wherein the set of parameters determined to charge the device is set according to a lookup table (LUT) with predetermined parameters for a particular device.

11. The method of claim 1 wherein the device provides the set of parameters to be used for charging the device.

12. The method of claim 1 wherein the device provides the set of parameters over a charging channel using a radio-frequency identification device (RF-ID).

13. The method of claim 1 wherein the device provides the set of parameters using a communication link separate from a channel used to charge the device.

14. A method of charging a device through mutual inductance:

combining at least two inductive fields created by two or more inductive coils positioned at different angles from each other;

delivering the combined inductive field at an orientation to the device;

measuring a load of the device to determine an effectiveness of the orientation of the combined inductive field on the device; and

charging the device at the orientation of the combined inductive field when the measured load of the device exceeds a threshold load level.

15. The method of claim 14 further comprising:

charging additional devices at different orientations of the combined inductive field when the measured load of each of the additional devices exceeds the threshold load level.

16. The method of claim 14 wherein the at least two inductive fields are combined using vector operations.

17. The method of claim 14 wherein the angles between the inductive coils are obtuse.

18. The method of claim 14 wherein the angles between the inductive coils are acute.

19. The method of claim 14 wherein the threshold load level is selected such that the device is fully charged within a predetermined time interval.

20. A computer program product, tangibly stored on a computer-readable medium, for adaptively charging a device, comprising instructions operable to cause a programmable processor to:

detect the presence of a device capable of receiving an inductive charge;

determine a set of parameters for charging the device through induction, wherein the determined set of parameters affects an amount of power on a primary coil that provides the inductive charge; and

transmit the inductive charge from the primary coil to the device for charging the device,

wherein determining a set of parameters includes

varying combinations of the parameters for charging the device during a time interval;

measuring a load of the device for each of the various combinations of the the parameters; and

selecting one of the various combinations of the parameters based on the measured load of the device.

21. A computer program product, tangibly stored on a computer-readable medium, for charging a device through mutual inductance, comprising instructions operable to cause a programmable processor to:

combine at least two inductive fields created by two or more inductive coils positioned at different angles from each other;

deliver the combined inductive field at an orientation to the device;

measure a load of the device to determine an effectiveness of the orientation of the combined inductive field on the device; and

charge the device at the orientation of the combined inductive field when the measured load of the device exceeds a threshold load level.

22. An apparatus that inductively charges one or more devices, comprising:

a sensor that receives signals indicating a charge level of the one or more devices;

a primary coil including a set of two or more induction coils positioned at different angles and capable of charging the one or more devices through mutual inductance;

a power source designed to deliver energy to the set of two or more induction coils and create an inductive field at different orientations to the one or more devices;

a memory having parameters for controlling the inductive field of the two or more induction coils; and

a processor that selectively combines the parameters and delivers the parameters to the power source for control of the two or more induction coils,

wherein the processor selectively combines the parameters by

varying combinations of the parameters for charging the one or more devices during a time interval;

measuring a load of the one or more devices for each of the various combinations of the parameters; and

selecting one of the various combinations of the parameters based on the measured load of the one or more devices.

23. The apparatus of claim 22 further comprising:

a communication port that exchanges charging information and status with the one or more devices over a communication channel separate from a charging channel.

24. The apparatus of claim 22 further comprising:

a load sensor that monitors the load when charging the one or more devices and determines when at least one of the one or more devices has completed charging based on information modulated through a variation in the load characteristic by the one or more devices.

25. An apparatus for adaptively charging a device, comprising:

means for detecting a presence of a device capable of receiving an inductive charge;

means for determining a set of parameters for charging the device through induction wherein the determined set of parameters affects an amount of power on a primary coil that provides the inductive charge; and

means for transmitting the inductive charge from the primary coil to the device for charging the device,

wherein determining a set of parameters includes

measuring a load of the device for each of the various combinations of the parameters; and

selecting one of the various combinations of the parameters based on the measured load of the device.

26. An apparatus for charging a device through mutual inductance, comprising:

means for combining at least two inductive fields created by two or more inductive coils positioned at different angles from each other;

means for delivering the combined inductive field at an orientation to the device;

means for measuring a load of the device to determine an effectiveness of the orientation of the combined inductive field on the device; and

means for charging the device at the orientation of the combined inductive field when the measured load of the device exceeds a threshold load level.