Wireless power receiver for controlling wireless power by using switch

• US 10,063,099 B2
• Filed: 08/17/2012
• Issued: 08/28/2018
• 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: Yeo, Sung-Ku, Cho, Gyu-Hyeong, Park, Se-Ho, Kim, Se-Ki, Lee, Young-Min, Choi, Jun-Han
• Primary Examiner(s): Ortiz, Elim
• Application Number:
  US13/588,609
• Publication Number:
  US 20130043737A1
• Time in Patent Office: 2,202 Days
• 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 power from a wireless power supplier, the wireless power receiver comprising:

a power reception unit configured to wirelessly receive the power from the wireless power supplier;

a rectifier configured to rectify the received power into DC power;

a power adjustor configured to disconnect the power reception unit from the rectifier for a first period and to connect the power reception unit to the rectifier for transferring the received power to the rectifier for a second period to adjust a size of the received power to be transferred to the rectifier; and

a controller configured to;

determine whether to increase or decrease the size of the received power to be transferred to the rectifier, and

in response to the size of the received power being transferred to the rectifier being determined to be increased, increase a duration of the second period,

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

wherein the size of the received power to be transferred to the rectifier is adjusted according to a ratio of a duration of the first period to the duration of the second period, and

wherein the received power is not transferred from the power reception unit to the rectifier during the first period.

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

a power storage unit configured to store the received power for the first period; and

a switch unit configured to connect the power reception unit and the power storage unit through short-circuiting for the first period and to connect 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 configured to feed back the rectified power and transfer the fed back power to the controller,

wherein the controller is configured to determine the first period and the second period based on the fed back power.

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

a comparator configured to compare a voltage value of the fed back power with a preset comparative voltage value; and

a processor configured to determine the first period and the second period based on a result of the comparison performed by the comparator, and to generate 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 configured to detect a synchronization signal for a synchronization with the power adjusting signal from the power received by the power reception unit,

wherein the controller is configured to generate the power adjusting signal based on the synchronization signal.

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

a communication unit configured to communicate with the wireless power supplier through a preset communication scheme,

wherein the controller is configured to generate a wireless power control signal for controlling the power based on the fed back power, and to control 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 configured to filter ripples from the rectified power and output the filtered 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 power wirelessly from the wireless power supplier;

determining whether to increase or decrease a size of the received power to be transferred to a rectifier of the wireless power receiver;

in response to the size of the received power being transferred to the rectifier being determined to be increased, increasing a duration of the second period;

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

wherein a size of the power to be transferred to the rectifier is adjusted according to a ratio of a duration of the first period to the duration of the second period.

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

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

wherein the first period and the second period are determined based on the fed back 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 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 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 power based on the fed back 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. A wireless power receiver for wirelessly receiving power from a wireless power supplier, the wireless power receiver comprising:

a power reception unit configured to wirelessly receive the power from the wireless power supplier;

a rectifier configured to rectify the received power into DC power;

a power adjustor configured to disconnect the power reception unit from the rectifier for a first period and to connect the power reception unit to the rectifier for transferring the received power to the rectifier for a second period to adjust a size of the received power to be transferred to the rectifier; and

a controller configured to;

determine whether to increase or decrease the size of the received power to be transferred to the rectifier, and

in response to the size of the received power being transferred to the rectifier being determined to be decreased, decrease a duration of the second period,

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

wherein the size of the received power to be transferred to the rectifier is adjusted according to a ratio of a duration of the first period to the duration of the second period, and

wherein the received power is not transferred from the power reception unit to the rectifier during the first period.