WIRELESS POWER RECEIVER FOR ADJUSTING MAGNITUDE OF WIRELESS POWER

• US 20130099588A1
• Filed: 10/19/2012
• Published: 04/25/2013
• Est. Priority Date: 10/19/2011
• Status: Active Grant

• Current Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Original Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Inventors: Cho, Gyu-Hyeong, Choi, Jun-Han, YEO, Sung-Ku, Park, Se-Ho, Kim, Yu-Su, Kim, Se-Ki
• Granted Patent: US 10,069,340 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• 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: H02M 7/2176 comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output

Abstract

A wireless power receiver for wirelessly receiving power from a wireless power supplier includes a power receiver for receiving wireless power from the wireless power supplier and storing the wireless power for a first time period, a rectifier connected to the power receiver for rectifying the wireless power, a power adjuster connected to the rectifier and an output end, for adjusting a magnitude of the wireless power by enabling the power receiver to store the wireless power for the first time period and delivering the wireless power to the output end for a second time period, and a controller for determining the first and second time periods.

Claims

1. A wireless power receiver that wirelessly receives power from a wireless power supplier, the wireless power receiver comprising:

a power receiver that receives wireless power from the wireless power supplier and stores the wireless power for a first time period;

a rectifier, connected to the power receiver, that rectifies the wireless power;

a power adjuster, connected to the rectifier and an output end, that adjusts a magnitude of the wireless power by enabling the power receiver to store the wireless power for the first time period and deliver the wireless power to the output end for a second time period; and

a controller that determines the first and second time periods.

2. The wireless power receiver of claim 1, wherein the power adjuster comprises a switch which is open-circuited to disconnect the power rectifier from the output end for the first time period and is short-circuited to connect the power rectifier and the output end.

3. The wireless power receiver of claim 2, wherein the switch comprises an N-type metal-oxide-semiconductor field-effect transistor (MOSFET) device,

wherein the controller determines the first and second time periods by adjusting a voltage applied to a gate of the N-type MOSFET.

4. The wireless power receiver of claim 3, further comprising a bootstrapper that bootstraps the voltage applied to the gate of the N-type MOSFET.

5. The wireless power receiver of claim 4, wherein the bootstrapper comprises a resonance inductor, connected to the gate of the N-type MOSFET device, that reduces a loss of the bootstrapping, and first and second switches that deliver high and low signals to be applied to the N-type MOSFET device, respectively.

6. The wireless power receiver of claim 2, wherein the switch comprises a P-type metal-oxide-semiconductor field-effect transistor (MOSFET) device.

7. The wireless power receiver of claim 1, further comprising a feedback circuit that sends the rectified wireless power to the controller as feedback wireless power,

wherein the controller determines the first and second time periods based on the feedback wireless power.

8. The wireless power receiver of claim 7, wherein the controller compares a voltage of the feedback wireless power to a reference voltage, determines the first and second time periods based on the comparison result, and generates a power adjustment signal to control an operation of the power adjuster.

9. The wireless power receiver of claim 8, further comprising a sync detector that detects, from the wireless power received from the power receiver, a sync signal to be in phase with the power adjustment signal,

wherein the controller generates the power adjustment signal based on the sync signal.

10. The wireless power receiver of claim 7, further comprising a communication unit that communicates with the wireless power supplier in a communication method,

wherein the controller generates a wireless power control signal to control the wireless power based on the feedback wireless power, and controls the communication unit to transmit the wireless power control signal to the wireless power supplier.

11. The wireless power receiver of claim 10, wherein the wireless power control signal includes at least one of identification information of the wireless power receiver, information regarding wireless reception, position information, environment setting information, safety-related information, and control information for the wireless power supplier.

12. The wireless power receiver of claim 11, wherein the control signal for the wireless power supplier includes at least one of control information for an application voltage of the wireless power supplier, control information of frequency and duty cycle of a power supply signal.

13. The wireless power receiver of claim 1, further comprising a regulator that generates output wireless power by filtering out ripples of the rectified wireless power.

14. The wireless power receiver of claim 1, wherein the rectifier comprises full-bridge diodes.

15. A method of controlling a wireless power receiver for wirelessly receiving power from a wireless power supplier, the method comprising:

receiving wireless power from the wireless power supplier;

rectifying the wireless power; and

adjusting a magnitude of the wireless power by preventing the wireless power from being output by disconnecting a path to an output end of the wireless power receiver for a first time period while outputting the wireless power for a second time period.

16. The method of claim 15, further comprising sending the rectified wireless power back as feedback wireless power and analyzing the feedback wireless power,

wherein the first and second time periods are determined based on the feedback wireless power.

17. The method of claim 16, wherein the first and second time periods are determined based on a comparison between a voltage of the feedback wireless power and a reference voltage,

further comprising generating and outputting a power adjustment signal to control the wireless power receiver for each of the first and second time periods.

18. The method of claim 17, further comprising detecting from the wireless power received from the power receiver a sync signal to be in phase with the power adjustment signal,

wherein the generating and outputting of the power adjustment signal comprises generating the power adjustment signal based on the sync signal.

19. The method of claim 16, wherein generating and outputting the power adjustment signal comprises,

generating a wireless power control signal to control the wireless power based on the feedback wireless power;

and

transmitting the wireless power control signal to the wireless power supplier.

20. The method of claim 19, wherein the wireless power control signal includes at least one of identification information of the wireless power receiver, information regarding wireless reception, position information, environment setting information, safety-related information, and control information for the wireless power supplier.

21. The method of claim 20, wherein the control signal for the wireless power supplier includes at least one of control information for an application voltage of the wireless power supplier, control information of frequency and duty cycle of a power supply signal.

22. The method of claim 15, further comprising generating an output wireless power by filtering out ripples of the rectified wireless power.