Wireless power receiver

• US 9,425,629 B2
• Filed: 07/13/2012
• Issued: 08/23/2016
• Est. Priority Date: 07/14/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Joon-Il, Park, Sung-Bum, Park, Se-Ho, Lee, Young-Min, Lee, Woo-Ram
• Primary Examiner(s): Tso, Edward
• Assistant Examiner(s): OMAR, AHMED H
• Application Number:
  US13/548,660
• Publication Number:
  US 20130015813A1
• Time in Patent Office: 1,502 Days
• Field of Search: 320/104, 320/106, 320/107, 320/108, 320/109, 320/125, 315/200, 307/104, 324/433, 379/31, 429/61, 455/566, 455/567, 606/32, 606/37, 606/38
• US Class Current: 1/1
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• 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 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage

Abstract

A wireless power receiver is provided for wirelessly receiving driving power from a wireless power transmitter. The wireless power receiver includes a power reception unit for wirelessly receiving the driving power from the wireless power transmitter. The wireless power receiver also includes a rectifier for rectifying the driving power from the power reception unit into a Direct Current (DC) power type. The wireless power receiver additionally includes a load unit for storing the rectified driving power from the rectifier. The wireless power receiver further includes a controller for detecting an amount of the rectified driving power stored in the load unit to control output from the rectifier to the load unit. The wireless power receiver also includes an impedance adjuster for adjusting an impedance in the power reception unit according to the amount of the rectified driving power stored in the load unit.

Claims

1. A wireless power receiver configured to wirelessly receive charging power from a wireless power transmitter, the wireless power receiver comprising:

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

a rectifier configured to rectify the charging power from the power reception unit into a Direct Current (DC) power type;

a load unit configured to store the rectified charging power from the rectifier;

a controller configured to detect an amount of the rectified charging power stored in the load unit; and

an impedance adjuster configured to adjust an impedance in the power reception unit according to the amount of the rectified charging power stored in the load unit.

2. The wireless power receiver as claimed in claim 1, wherein the controller detects that the amount of the rectified charging power stored in the load unit changes a charging mode from a Constant Current (CC) mode to a Constant Voltage (CV) mode.

3. The wireless power receiver as claimed in claim 2, wherein, when the amount of the rectified charging power stored in the load unit is changed from the CC mode to the CV mode, the controller connects the impedance adjuster to at least one of a front end and a rear end of the rectifier.

4. The wireless power receiver as claimed in claim 3, further comprising one or more switch units arranged between the impedance adjuster and the at least one of the front end and the rear end of the rectifier, wherein the controller controls the one or more switch units to be in an off state in the CC mode and to be in an on state in the CV mode.

5. The wireless power receiver as claimed in claim 3, wherein the impedance adjuster is connected to the front end of the rectifier in the CV mode.

6. The wireless power receiver as claimed in claim 5, wherein the impedance adjuster comprises one or more of a capacitor, a coil, and a resistor.

7. The wireless power receiver as claimed in claim 6, wherein the capacitor, the coil, and the resistor are a variable capacitor, a variable coil, and a variable resistor, respectively.

8. The wireless power receiver as claimed in claim 3, wherein the impedance adjuster is connected to the rear end of the rectifier in the CV mode.

9. The wireless power receiver as claimed in claim 7, wherein the impedance adjuster comprises one or more resistors.

10. The wireless power receiver as claimed in claim 9, wherein the one or more resistors are variable resistors.

11. The wireless power receiver as claimed in claim 2, wherein the impedance adjuster adjusts the impedance such that the impedance of the wireless power receiver is substantially equal in the CC mode and the CV mode.

12. A method for wirelessly receiving charging power at a wireless power receiver from a wireless power transmitter, the method comprising the steps of:

wirelessly receiving the charging power from the wireless power transmitter, at a wireless reception unit of the wireless power receiver;

rectifying the charging power from the power reception unit into a Direct Current (DC) power type, at a rectifier of the wireless power receiver;

storing the rectified charging power from the rectifier, at a load unit of the wireless power receiver;

detecting an amount of the charging driving power stored in the load unit, at a controller of the wireless power receiver; and

adjusting an impedance in the power reception unit according to the amount of the rectified driving power stored in the load unit, at an impedance adjuster of the wireless power receiver.