Wireless power system with device specific power configuration and method therefor

• US 10,361,590 B2
• Filed: 03/13/2017
• Issued: 07/23/2019
• Est. Priority Date: 03/13/2017
• Status: Active Grant

• Current Assignee: Dell Products LP (Dell Technologies Inc.)
• Original Assignee: Dell Products LP (Dell Technologies Inc.)
• Inventors: Files, Jace W., Bui, Vinh Xuan
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Pham, Duc M
• Application Number:
  US15/457,867
• Publication Number:
  US 20180262048A1
• Time in Patent Office: 862 Days
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A method includes establishing mutual communication between a wireless power transmitting unit (PTU) and a wireless power receiving unit (PRU), receiving at the wireless PTU an identifier corresponding to a device that includes the wireless PRU, and selecting a wireless PTU power transmission level based on the identifier.

Claims

1. A method comprising:

associating an identifier with an information handling system that includes a wireless power receiving unit (PRU);

positioning the information handling system for wireless charging at a wireless charging device, the wireless charging device including a wireless power transmitting unit (PTU);

characterizing a maximum PTU power level that complies with Specific Absorption Rate (SAR) regulations, the maximum PTU power transmission level corresponding to a degree of electromagnetic shielding of the PTU provided by the information handling system;

associating the maximum PTU power transmission level with the identifier;

storing the identifier at a memory device included at the information handling system; and

storing the identifier and the associated maximum PTU power transmission level at a memory device included at the wireless charging device,

wherein during operation the PTU is configured to receive the stored identifier from the information handling system and to provide the associated maximum PTU power transmission level based on the identifier.

2. The method of claim 1, further comprising:

determining that the received stored identifier is not associated with a corresponding power transmission level; and

configuring the wireless PTU to provide a predetermined default power transmission level.

3. The method of claim 1, further comprising:

in response to failing to receive the stored identifier at the wireless PTU, configuring the wireless PTU to provide a predetermined default power transmission level.

4. The method of claim 1, wherein the stored identifier received from the wireless PRU is encrypted, and receiving the stored identifier at the wireless PTU further comprises decrypting the stored identifier.

5. A wireless power transmission device (PTU) comprising:

a power transmission resonator;

a wireless data communication transceiver coupled to the power transmission resonator, the transceiver to;

establish mutual communication between the wireless PTU and a wireless power receiving unit (PRU); and

receive at the wireless PTU an identifier corresponding to a device that includes the wireless PRU; and

a controller coupled to the power transmission resonator, the controller to;

determine that the identifier is stored at a memory device accessible to the controller;

retrieve a maximum PTU power transmission level from the memory device, the maximum PTU power transmission level associated with the stored identifier and determined during a Specific Absorption Rate (SAR) characterization process during which a degree of electromagnetic shielding by the device is determined; and

configure the wireless PTU to operate at the maximum PTU power transmission level based on the identifier.

6. The wireless power transmission device of claim 5, wherein the

a maximum wireless PTU power transmission level is a maximum power level that is compliant with Specific Absorption Rate (SAR) regulations.

7. The wireless power transmission device of claim 6, wherein the maximum power transmission level at the wireless PTU depends on electromagnetic shielding provided by the device while the device receives power from the wireless PTU.

8. The wireless power transmission device of claim 5, wherein the controller is further to:

determine that the received identifier is not associated with a corresponding power transmission level; and

configure the wireless PTU to provide a predetermined default power transmission level.

9. The wireless power transmission device of claim 5, wherein the controller is further to:

in response to failing to receive the identifier at the wireless PTU, configure the wireless PTU to provide a predetermined default power transmission level.

10. The wireless power transmission device of claim 5, wherein the identifier received from the wireless PRU is encrypted, and the controller is further to decrypt the identifier.

11. A wireless power system comprising:

an information handling s stern including a wireless power receiving unit (PRU);

a wireless charging device including a wireless power transmitting unit (PTU); and

a Specific Absorption Rate (SAR.) characterization device, the SAR characterization device to;

characterize a maximum PTU power level that complies with Specific Absorption Rate (SAR) regulations, the maximum PTU power transmission level corresponding to a degree of electromagnetic shielding of the PTU provided by the information handling system;

associate the maximum PTU power transmission level with the identifier;

store the identifier at a memory device included at the information handling system; and

store the identifier and the associated maximum PTU power transmission level at a memory device included at the wireless charging device,

wherein during operation the PTU is configured to receive the identifier from the information handling system, retrieve the associated maximum PTU power transmission level from the memo device included at the wireless charging device, and configure the to operate at the associated maximum power transmission level.

12. The wireless power system of claim 11, wherein the wireless PTU is further to:

determine that the received stored identifier is not associated with a corresponding power transmission level; and

configure the wireless PTU to provide a predetermined default power transmission level.

13. The wireless power system of claim 11, wherein the wireless PTU is further to:

in response to failing to receive the stored identifier at the wireless PTU, configure the wireless PTU to provide a predetermined default power transmission level.

14. The wireless power system of claim 11, wherein the stored identifier received from the wireless PRU is encrypted, and the controller is further to decrypt the identifier.