Wireless charging apparatus and method

• US 9,000,723 B2
• Filed: 05/17/2012
• Issued: 04/07/2015
• Est. Priority Date: 05/17/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Sung-Bum, Park, Se-Ho, Lee, Young-Min
• Primary Examiner(s): DOAN, NGHIA M
• Application Number:
  US13/474,300
• Publication Number:
  US 20120293119A1
• Time in Patent Office: 1,055 Days
• Field of Search: 320/109
• US Class Current: 320/109
• CPC Class Codes: H02J 2310/22 The load being a portable electronic device
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/0049 Detection of fully charged condition
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Methods and apparatus for wireless charging are provided. Transmission power transmitted from a wireless power transmitter is received at a power receiver of a wireless power receiver. A battery of the wireless power receiver is charged with the received transmission power. It is determined whether the battery is fully charged. A packet from a communication unit of the wireless power receiver is transmitted to the wireless power transmitter when the battery is fully charged. An auxiliary charge of the battery is performed by receiving strength-reduced transmission power from the wireless power transmitter.

Claims

1. A wireless power receiver comprising:

a power receiver for receiving transmission power from a wireless power transmitter;

a communication unit for transmitting a Charge Status (CS) packet to the wireless power transmitter when a battery of the wireless power receiver is fully charged from the received transmission power, wherein the CS packet comprises a full charge status indicator;

a Power Management Integrated Circuit (PMIC) for charging the battery with the received transmission power, and, when the battery is fully charged, providing a full charge message and performing an auxiliary charge of the battery with strength-reduced transmission power; and

a controller for controlling the communication unit to transmit the CS packet upon receiving the full charge message from the PMIC.

2. The wireless power receiver of claim 1, wherein the CS packet is based on a Wireless Power Consortium (WPC) standard.

3. The wireless power receiver of claim 2, wherein the CS packet comprises information indicating a charge level and has a value of 1 to 100, and wherein the CS packet has a value of 0×

63 indicating a value of 100 when the battery is fully charged.

4. The wireless power receiver of claim 1, further comprising a display for displaying a fully charged status of the battery when the battery is fully charged.

5. A wireless charging method of a wireless power receiver comprising the steps of:

receiving transmission power transmitted from a wireless power transmitter at a power receiver of the wireless power receiver;

charging a battery of the wireless power receiver with the received transmission power;

determining whether the battery is fully charged;

transmitting a Charge Status (CS) packet from a communication unit of the wireless power receiver to the wireless power transmitter when the battery is fully charged; and

performing an auxiliary charge of the battery by receiving strength-reduced transmission power from the wireless power transmitter.

6. The wireless charging method of claim 5, wherein the packet is based on a Wireless Power Consortium (WPC) standard.

7. The wireless charging method of claim 6, wherein the CS packet comprises information indicating a charge level and has a value of 1 to 100, and wherein the CS packet has a value of 0×

63 indicating a value of 100 when the battery is fully charged.

8. The wireless charging method of claim 5, further comprising displaying a fully charged status of the battery on a display of the wireless receiving apparatus when the battery is fully charged.

9. A wireless power transmitter comprising:

a power converter for converting supplied power into wireless power and transmitting the wireless power;

a communication unit for receiving a Charge Status (CS) packet from a wireless power receiver, wherein the CS packet comprises a full charge status indicator for a battery of the wireless power receiver;

a controller for reducing a strength of the wireless power transmitted from the power converter to a predetermined strength when the CS packet is received from the wireless power receiver; and

a display for displaying a fully charged status of the wireless power receiver.

10. The wireless power transmitter of claim 9, wherein the CS packet is based on a Wireless Power Consortium (WPC) standard.

11. The wireless power transmitter of claim 10, wherein the CS packet comprises information indicating a charge level and has a value of 1 to 100, and wherein the CS packet has a value of 0×

63 indicating a value of 100 when the battery is fully charged.

12. A wireless charging method of a wireless power transmitter, comprising the steps of:

converting supplied power into wireless power at a power converter of the wireless power transmitter;

transmitting the wireless power from the power converter to a wireless power receiver;

receiving a Charge Status (CS) packet from the wireless power receiver at a communication unit of the wireless power transmitter, wherein the CS packet comprises a full charge status indicator for a batter of the wireless power receiver;

reducing a strength of the wireless power transmitted from the power converter to a predetermined strength when the CS packet is received from the wireless power receiver; and

displaying a fully charged status of the wireless power receiver on a display of the wireless power transmitter.

13. The wireless power transmitter of claim 12, wherein the CS packet is based on a Wireless Power Consortium (WPC) standard.

14. The wireless power transmitter of claim 13, wherein the CS packet comprises information indicating a charge level and has a value of 1 to 100, and wherein the CS packet has a value of 0×

63 indicating a value of 100 when the battery is fully charged.