WIRELESS POWER RECEIVER

• US 20160359357A1
• Filed: 08/19/2016
• Published: 12/08/2016
• 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
• Granted Patent: US 9,812,893 B2
• Time in Patent Office: Days
• 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 for wirelessly receiving driving power from a wireless power transmitter and a method for wirelessly receiving charging power at a wireless power receiver from a wireless power transmitter are provided. The wireless power receiver includes 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; a load unit configured to store the rectified charging power from the rectifier; and a controller configured to detect a change of a charging mode for the load unit, and control to adjust an impedance in the power reception unit according to the change of the charging mode.

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;

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

a controller configured to;

detect a change of a charging mode for the load unit, and

control to adjust an impedance in the power reception unit according to the change of the charging mode.

2. The wireless power receiver as claimed in claim 1, wherein the controller detects that the charging mode is changed from a Constant Current (CC) mode to a Constant Voltage (CV) mode.

3. The wireless power receiver as claimed in claim 2, further comprising an impedance adjuster configured to adjust an impedance in the power reception unit, and

wherein, the controller is further configured to connect the impedance adjuster to at least one of a front end and a rear end of the rectifier in response to detecting the change of the charging mode.

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 is further configured to control 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 3, wherein the impedance adjuster is further configured to adjust 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, 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 a change of a charging mode for the load unit; and

adjusting an impedance in the power reception unit according to the change of the charging mode.

13. The method as claimed in claim 12, wherein detecting the change of the charging mode comprises detecting that the charging mode is changed from a Constant Current (CC) mode to a Constant Voltage (CV) mode.