Apparatus and method for wireless power reception

Patent metadata

Field	Value
Publication number	US-9437362-B2
Application number	US-201313927181-A
Country	US
Kind code	B2
Filing date	Jun 26, 2013
Priority date	Jul 10, 2012
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

An apparatus and a method for wireless power reception are provided. A wireless power receiver includes a receiving unit configured to wirelessly receive a power. The wireless power receiver further includes a power consuming unit configured to consume the power, until a voltage applied to a load reaches a predetermined value, so that an amount of a power transferred from the receiving unit to the load is less than or equal to an initial accommodation power amount of the load.

First claim

What is claimed is:

1. A wireless power receiver comprising:
a receiving unit configured to wirelessly receive a power;
a rectifier configured to rectify an alternating current (AC) signal of the power to a direct current (DC) signal;
a power consumer configured to consume the power, until a voltage applied to a load reaches a predetermined value, so that an amount of a power transferred from the receiving unit to the load is less than or equal to an initial accommodation power amount of the load; and
a controller configured to control an operation of the power consumer based on a magnitude of the DC signal,
wherein the initial accommodation power amount is determined based on a value of a current that may be accommodated in the load when charging of the load is started.

2. The wireless power receiver of claim 1 , wherein the controller is further configured to:
control the power consumer to be operated when the magnitude of the DC signal is less than a predetermined value; and
control the operation of the power consumer to be suspended when the magnitude of the DC signal is greater than or equal to the predetermined value.

3. The wireless power receiver of claim 1 , wherein the controller comprises:
a current detector configured to detect a current of the DC signal; and
a comparator configured to
compare the current with a predetermined current,
output a high signal when the current is less than the predetermined current to control the power consumer to be operated, and
output a low signal when the current is greater than or equal to the predetermined current to control an operation of the power consumer to be suspended.

4. The wireless power receiver of claim 1 , wherein the power consumer comprises:
a power dump resistor comprising a resistance that is in inverse proportion to the initial accommodation power amount; and
a switch configured to enable the power dump resistor to be operated or suspended.

5. The wireless power receiver of claim 1 , further comprising:
a rectifier configured to rectify an alternating current (AC) signal of the power to a direct current (DC) signal; and
a DC-to-DC (DC/DC) converter configured to convert a magnitude of the DC signal to a magnitude required by the load.

6. The wireless power receiver of claim 5 , wherein the DC/DC converter comprises:
a voltage measuring unit configured to measure a voltage applied to an on-resistor of a transistor connected in series to the rectifier;
an amplifier configured to amplify the measured voltage; and
a comparator configured to
compare the amplified voltage with a predetermined voltage,
output a high signal when the amplified voltage is less than the predetermined voltage to control the power consumer to be operated, and
output a low signal when the amplified voltage is greater than or equal to the predetermined voltage to control an operation of the power consumer to be suspended.

7. The wireless power receiver of claim 5 , wherein the DC/DC converter comprises:
a switch controller configured to control an operation switch of the power consumer based on a magnitude of a voltage applied to a capacitor when the receiving unit receives the power.

8. The wireless power receiver of claim 7 , wherein the switch controller is further configured to:
power on the operation switch to control the power consumer to be operated when the magnitude of the voltage applied to the capacitor is less than or equal to a predetermined value; and
power off the operation switch to control the operation of the power consumer to be suspended when the magnitude of the voltage applied to the capacitor is greater than the predetermined value.

9. The wireless power receiver of claim 7 , wherein the switch controller comprises:
a power supply configured to supply an amount of a current to the capacitor when the receiving unit receives the power; and
a capacitor configured to store the current.

10. The wireless power receiver of claim 1 , further comprising:
a rectifier configured to rectify an alternating current (AC) signal of the power to a direct current (DC) signal;
a controller configured to control an operation of the power consumer based on a magnitude of the DC signal; and
an interrupting unit configured to interrupt an electrical connection between the rectifier and the load based on the magnitude of the DC signal.

11. The wireless power receiver of claim 10 , wherein the interrupting unit is further configured to:
interrupt the electrical connection when the magnitude of the DC signal is greater than a magnitude of a voltage that is allowed in the load.

12. A wireless power reception method comprising:
wirelessly receiving a power;
rectifying an alternating current (AC) signal of the power to a direct current (DC) signal;
consuming the power, until a voltage applied to a load reaches a predetermined value, so that an amount of a power transferred from a receiving unit to the load is less than or equal to an initial accommodation power amount of the load; and
controlling the consuming of the power based on a magnitude of the DC signal,
wherein the initial accommodation power amount is determined based on a value of a current that may be accommodated in the load when charging of the load is started.

13. The wireless power reception method of claim 12 , further comprising:
consuming the power when the magnitude of the DC signal is less than a predetermined value; and
suspending the consuming of the power when the magnitude of the DC signal is greater than or equal to the predetermined value.

14. The wireless power reception method of claim 12 , further comprising:
detecting a current of the DC signal;
comparing the current with a predetermined current;
consuming the power when the current is less than the predetermined current; and
suspending the consuming of the power when the current is greater than or equal to the predetermined current.

15. The wireless power reception method of claim 12 , further comprising:
rectifying, by a rectifier, an alternating current (AC) signal of the power to a direct current (DC) signal; and
converting a magnitude of the DC signal to a magnitude required by the load.

16. The wireless power reception method of claim 15 , further comprising:
measuring a voltage applied to an on-resistor of a transistor connected in series to the rectifier;
amplifying the measured voltage;
comparing the amplified voltage with a predetermined voltage;
consuming the power when the amplified voltage is less than the predetermined voltage; and
suspending the consuming of the power when the amplified voltage is greater than or equal to the predetermined voltage.

17. The wireless power reception method of claim 12 , further comprising:
controlling the consuming of the power based on a magnitude of a voltage applied to a capacitor when the power is received.

18. The wireless power reception method of claim 12 , further comprising:
rectifying, by a rectifier, an alternating current (AC) signal of the power to a direct current (DC) signal;
controlling the consuming of the power based on a magnitude of the DC signal; and
interrupting an electrical connection between the rectifier and the load based on the magnitude of the DC signal.

19. The wireless power receiver of claim 1 , wherein the predetermined value is corresponding to a value of the voltage measured when the charging of the load is started in a constant current (CC) mode.

20. The wireless power reception metho

Assignees

• Samsung Electronics Co Ltd
• Iucf-Hyu (Industry-University Coop Found Hanyang University)

Inventors

• Kim Dong Zo
• Kwon Sang Wook
• Kim Ki Young
• Kim Nam Yun
• Kim Seong Joong
• Roh Yong Seong
• Moon Young Jin
• Park Yun Kwon
• Song Keum Su
• Yoo Chang Sik
• Yoon Chang Wook
• Choi Jin Sung

Classifications

• H02J50/90

  involving detection or optimisation of position, e.g. alignment · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title

• H02J7/42

  with electronic devices having internal batteries, e.g. mobile phones · CPC title

• H04B5/24

  Inductive coupling · CPC title

• H04B5/0037

  Electricity · mapped topic