Apparatus for wireless power transmission and reception

• US 9,252,604 B2
• Filed: 07/13/2011
• Issued: 02/02/2016
• Est. Priority Date: 09/15/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Sang Joon
• Primary Examiner(s): CAVALLARI, DANIEL J
• Application Number:
  US13/182,342
• Publication Number:
  US 20120062203A1
• Time in Patent Office: 1,665 Days
• Field of Search: 307/104
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• 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 7/0024 Parallel/serial switching of connection of batteries to charge or load circuit

Abstract

Provided is a wireless power transmission system to increase efficiency in wireless power transmission. A wireless power transmitter may include: one or more capacitors; a power inputting unit configured to receive power from a power supply and to charge the one or more capacitors; a transmitting unit configured to transmit resonance power; and a switching unit configured to control electrical connection of the one or more capacitors to the power inputting unit and to the transmitting unit. A wireless power receiver is also described.

Claims

1. A wireless power transmitter comprising:

a capacitor;

a power inputting unit configured to charge the capacitor;

a transmitting unit configured to transmit resonance power; and

a switching unit configured to connect the capacitor to the power inputting unit and to the transmitting unit.

2. The wireless power transmitter of claim 1, wherein the power inputting unit comprises a DC power supply or an AC power supply configured to charge the capacitor.

3. The wireless power transmitter of claim 1, wherein the switching unit is configured to connect the capacitor to only the power inputting unit or only the transmitting unit.

4. The wireless power transmitter of claim 1, wherein the switching unit comprises a switch configured to connect the capacitor between the power inputting unit and the transmitting unit.

5. The wireless power transmitter of claim 1, further comprising:

a controller configured to

sense power stored in the capacitor, and

control the switching unit to connect the capacitor to the power inputting unit during a charge time, and control the switching unit to connect the capacitor to the transmitting unit during a transmission time, based on the sensed power.

6. The wireless power transmitter of claim 5, wherein the controller is configured to control the switching unit to connect the capacitor to the transmitting unit until the capacitor is discharged to a level less than a predetermined level.

7. The wireless power transmitter of claim 5, wherein the controller is configured to control the switching unit to connect the capacitor to the power inputting unit until the capacitor is charged to a level greater than or equal to a predetermined level.

8. A wireless power receiver comprising:

a capacitor;

a receiving unit configured to receive resonance power, and charge the capacitor;

a power outputting unit configured to transmit power to a target device; and

a switching unit configured to connect the capacitor to the receiving unit and to the power outputting unit.

9. The wireless power receiver of claim 8, wherein the switching unit is configured to connect the capacitor to only the receiving unit or only the power outputting unit.

10. The wireless power receiver of claim 8, wherein the target device comprises a battery.

11. The wireless power receiver of claim 8, further comprising:

a controller configured to

sense power stored in the capacitor, and

control the switching unit to connect the capacitor to the receiving unit during a charge time, and control the switching unit to connect the capacitor to the power outputting unit during a transmission time, based on the sensed power.

12. The wireless power receiver of claim 11, wherein the controller is configured to

control the switching unit to connect the capacitor to the receiving unit during the charge time after a waiting time between the charge time and the transmission time;

and

control the switching unit to connect the capacitor to the power outputting unit during the transmission time after the waiting time.

13. The wireless power receiver of claim 11, wherein the controller is configured to control the switching unit to connect the capacitor to the receiving unit until the capacitor is charged to a level greater than or equal to a predetermined level.

14. The wireless power receiver of claim 11, wherein, the controller is configured to control the switching unit to connect the capacitor to the power outputting unit until the capacitor is discharged to a level less than a predetermined level.

15. A wireless power transmitter comprising:

a capacitor;

a power inputting unit configured to be connected to the capacitor for a first period to charge the capacitor; and

a transmitting unit configured to be connected to the capacitor for a second period to transmit resonance power.

16. The wireless power transmitter of claim 15, wherein the first period does not overlap with the second period.

17. The wireless power transmitter of claim 15, wherein the first and second periods are fixed.

18. The wireless power transmitter of claim 15, wherein the first and second periods are variable.

19. The wireless power transmitter of claim 15, wherein the power inputting unit comprises an AC power supply.

20. The wireless power transmitter of claim 15, further comprising:

another capacitor arranged in parallel to the capacitor,

wherein the power inputting unit is further configured to be connected to the other capacitor for the second period to charge the other capacitor, and

wherein the transmitting unit is further configured to be connected to the other capacitor for the first period to transmit resonance power.

21. A wireless power receiver comprising:

a capacitor;

a receiving unit configured to be connected to the capacitor for a first period to receive resonance power and to charge the capacitor; and

a power outputting unit configured to be connected to the capacitor for a second period to transmit power to a target device.

22. The wireless power receiver of claim 21, wherein the target device comprises a battery.

23. The wireless power receiver of claim 21, further comprising:

another capacitor arranged in parallel to the capacitor,

wherein the receiving unit is further configured to be connected to the other capacitor for the second period to receive resonance power and to charge the other capacitor, and

wherein the power outputting unit is further configured to be connected to the other capacitor for the first period to transmit power to the target device.

24. The wireless power receiver of claim 21, wherein the first and second periods are fixed.

25. The wireless power receiver of claim 21, wherein the first and second periods are variable.

26. The wireless power receiver of claim 21, wherein the first period does not overlap with the second period.