WIRELESS POWER RECEIVER FOR CONTROLLING WIRELESS POWER BY USING SWITCH

• US 20130043737A1
• Filed: 08/17/2012
• Published: 02/21/2013
• Est. Priority Date: 08/19/2011
• 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: Park, Se-Ho, Lee, Young-Min, Yeo, Sung-Ku, Cho, Gyu-Hyeong, Kim, Se-Ki, Choi, Jun-Han
• Granted Patent: US 10,063,099 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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 1/0085 Partially controlled bridges

Abstract

A wireless power receiver for wirelessly receiving a supply of power from a wireless power supplier is disclosed. The wireless power receiver includes a power reception unit for wirelessly receiving wireless power from the wireless power supplier; a rectifier for rectifying the wireless power into power including a DC waveform; a power adjustor for configuring a closed loop with the power reception unit for a first period and transferring the wireless power to the rectifier for a second period to adjust a size of the wireless power; and a controller for determining the first period and the second period, wherein the power adjustor is electrically connected to the power reception unit and the rectifier.

Claims

1. A wireless power receiver for wirelessly receiving a supply of power from a wireless power supplier, the wireless power receiver comprising:

a power reception unit for wirelessly receiving wireless power from the wireless power supplier;

a rectifier for rectifying the wireless power into power including a DC waveform;

a power adjustor for configuring a closed loop with the power reception unit for a first period and transferring the wireless power to the rectifier for a second period to adjust a size of the wireless power,; and

a controller for determining the first period and the second period,

wherein the power adjustor is electrically connected to the power reception unit and the rectifier.

2. The wireless power receiver of claim 1, wherein the power adjustor comprises:

a power storage unit for storing the wireless power for the first period,; and

a switch unit for connecting the power reception unit and the power storage unit through short-circuiting for the first period and connecting the power reception unit and the rectifier through disconnection for the second period,

wherein the power storage unit is connected to the power reception unit in series.

3. The wireless power receiver of claim 2, wherein the power storage unit comprises an inductor and a capacitor connected in series.

4. The wireless power receiver of claim 2, wherein the switch unit is an N type MOSFET device, and the controller adjusts a voltage applied to a gate of the N type MOSFET device to determine the first period and the second period.

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

a feedback circuit unit for feeding back the rectified wireless power and transferring the fed back wireless power to the controller,

wherein the controller determines the first period and the second period based on the fed back wireless power.

6. The wireless power receiver of claim 5, wherein the controller comprises:

a comparator for comparing a voltage value of the fed back wireless power with a preset comparative voltage value; and

a processor for determining the first period and the second period based on a result of the comparison performed by the comparator, and generating a power adjusting signal for controlling an operation of the power adjustor.

7. The wireless power receiver of claim 6, further comprising:

a synchronization signal detector for detecting a synchronization signal for a synchronization with the power adjusting signal from the wireless power received by the power reception unit,

wherein the controller generates the power adjusting signal based on the synchronization signal.

8. The wireless power receiver of claim 5, further comprising:

a communication unit for communicating with the wireless power supplier through a preset communication scheme,

wherein the controller generates a wireless power control signal for controlling the wireless power based on the fed back wireless power, and controls such that the communication unit transmits the wireless power control signal to the wireless power supplier.

9. The wireless power receiver of claim 8, wherein the wireless power control signal includes one or more of IDentifier (ID) information of the wireless power receiver, information related to power reception, position information, environment setting information, information related to safety, and control information of the wireless power supplier.

10. The wireless power receiver of claim 9, wherein the control information of the wireless power supplier contains one or more of an applied voltage of the wireless power supplier, a frequency of a power supply signal, and duty cycle control information.

11. The wireless power receiver of claim 1, further comprising a regulator for filtering ripples from the rectified wireless power and outputting the filtered wireless power.

12. The wireless power receiver of claim 1, wherein the rectifier is a full-bridge diode.

13. The wireless power receiver of claim 12, wherein two low sides of the full-bridge diode comprise FET switches synchronized with one another, respectively.

14. The wireless power receiver of claim 1, wherein the power adjustor comprises:

a first capacitor, one end of which is connected to the power reception unit;

a first switch connected to an other end of the first capacitor, short-circuited for the first period, and disconnected for the second period;

a ground connected to the first switch;

a second switch connected to the ground, short-circuited for the first period, and disconnected for the second period; and

a second capacitor, one end of which is connected to the second switch.

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

receiving wireless power from the wireless power supplier; and

controlling such that the wireless power is not output for a first period by configuring a closed loop within the wireless power receiver, and the wireless power is output and then rectified for a second period.

16. The control method of claim 15, further comprising:

feeding back the rectified wireless power and analyzing the fed back wireless power,

wherein the first period and the second period are determined based on the fed back wireless power.

17. The control method of claim 16, further comprising:

generating and outputting a power adjusting signal for controlling the wireless power receiver for the first period and the second period,

wherein the first period and the second period are determined by a result of a comparison between a voltage value of the fed back wireless power and a preset comparative voltage value.

18. The control method of claim 17, further comprising:

detecting a synchronization signal for a synchronization with the power adjusting signal from the wireless power received by the power reception unit,

wherein generating and outputting the power adjusting signal comprises generating the power adjusting signal based on the synchronization signal.

19. The control method of claim 17, wherein generating and outputting the power adjusting signal comprises generating a wireless power control signal for a control of the wireless power based on the fed back wireless power, and transmitting the wireless power control signal to the wireless power supplier.

20. The control method of claim 19, wherein the wireless power control signal contains one or more of IDentifier (ID) information of the wireless power receiver, information related to power reception, position information, environment setting information, information related to safety, and control information on the wireless power supplier.

21. The control method of claim 20, wherein the control information of the wireless power supplier contains one or more of an applied voltage of the wireless power supplier, a frequency of a power supply signal, and duty cycle control information.

22. The control method of claim 15, further comprising filtering ripples from the rectified wireless power and outputting the filtered wireless power.