Wireless power receiving apparatus and power control method thereof related applications

• US 9,479,005 B2
• Filed: 03/23/2012
• Issued: 10/25/2016
• Est. Priority Date: 03/23/2011
• Status: Active Grant

• Current Assignee: GE Hybrid Technologies, LLC
• Original Assignee: Hanrim Postech Co., Ltd.
• Inventors: Jung, Chun-Kil, Kuk, Yoon-Sang
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Baxter, Brian K
• Application Number:
  US13/428,226
• Publication Number:
  US 20120242163A1
• Time in Patent Office: 1,677 Days
• Field of Search: 307/104
• US Class Current: 1/1
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• 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 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00308 Overvoltage protection

Abstract

A wireless power receiving device and a power control method thereof. The wireless power receiving apparatus, includes: a secondary core configured to receive a wireless power signal from a primary core of a wireless power transmission apparatus; a magnetic sensor configured to detect a magnetic field generated from the primary core; and a receiving controller configured to transmit an error code to the wireless power transmission apparatus via the secondary core if a measured magnetic field value from the magnetic sensor is lower than a reference magnetic value and the communication with the wireless power transmission apparatus is available.

Claims

1. A wireless power receiving apparatus, comprising:

a secondary core to receive a wireless power signal from a primary core of a wireless power transmission apparatus;

a magnetic sensor to detect a magnetic field value generated from the primary core for detecting a foreign object; and

a receiving controller to determine the foreign object is detected if the detected magnetic field value from the magnetic sensor is lower than a reference magnetic field value, to determine the foreign object is not detected if the detected magnetic field value is equal to or greater than the reference magnetic field value, and to transmit an error code to the wireless power transmission apparatus via the secondary core if the detected magnetic field value from the magnetic sensor is lower than the reference magnetic field value and communication with the wireless power transmission apparatus is available,

wherein the error code represents the foreign object is detected, and

wherein the wireless power signal is not received when the error code is not transmitted to the wireless power transmission apparatus because of the communication with the wireless power transmission apparatus is not available.

2. The apparatus of claim 1, wherein the magnetic sensor is a Hall IC sensor.

3. The apparatus of claim 1, wherein the magnetic sensor is installed on a main surface of the wireless power receiving apparatus.

4. The apparatus of claim 1, further comprising an alarm module, wherein the receiving controller outputs error data showing that the wireless power signal cannot be fully received through the alarm module if the measured magnetic field value from the magnetic sensor is lower than the reference magnetic field value.

5. The apparatus of claim 1, further comprising a battery, wherein the receiving controller transmits a wireless power change signal to the wireless power transmission apparatus based on a charging state signal measured in the battery.

6. The apparatus of claim 1, wherein the magnetic sensor is positioned at a location corresponding to a central point of the secondary core.

7. The apparatus of claim 1, further comprising a circuit board, wherein the magnetic sensor is installed on the circuit board.

8. The apparatus of claim 7, wherein the circuit board comprises a protective circuit module (PCM).

9. The apparatus of claim 1, wherein the magnetic field value being lower than the reference magnetic field value is indicative of the foreign object on or near a charging position of the wireless power transmission apparatus.

19. The apparatus of claim 1, wherein the magnetic sensor is used for checking charging position.

10. A method for controlling a receiving power in a wireless power receiving apparatus, the method comprising:

obtaining a measured magnetic field value by measuring a magnetic field formed by a primary core of a wireless power transmission apparatus via a magnetic sensor installed on the wireless power receiving apparatus for detecting a foreign object

determining the foreign object is detected if the measured magnetic field value from the magnetic sensor is lower than a reference magnetic field value and the foreign object is not detected if the measured magnetic field value is equal to or greater than the reference magnetic field value; and

transmitting an error code to the wireless power transmission apparatus via a secondary core if the measured magnetic field value from the magnetic sensor is lower than the reference magnetic field value and communication with the wireless power transmission apparatus is available,

wherein the error code represents the foreign object is detected, and

wherein the wireless power signal is not received when the error code is not transmitted to the wireless power transmission apparatus because of the communication with the wireless power transmission apparatus is not available.

11. The method of claim 10, wherein the magnetic sensor is a Hall IC sensor.

12. The method of claim 10, wherein the magnetic sensor is installed on a main surface of the wireless power receiving apparatus.

13. The method of claim 10, further comprising outputting error data showing that the wireless power signal is not received through the alarm module if the measured magnetic field value from the magnetic sensor is lower than the reference magnetic field value.

14. The method of claim 10, further comprising transmitting a wireless power change signal to the wireless power transmission apparatus based on a charging state signal measured in a battery of the wireless power receiving apparatus.

15. The method of claim 10, wherein the magnetic field value being lower than the reference magnetic field value is indicative of the foreign object on or near a charging position of the wireless power transmission apparatus.

16. The method of claim 10, further comprising stopping a wireless power signal from being transmitted from the wireless power transmission apparatus to the wireless power receiving apparatus in response to the wireless power transmission apparatus receiving the error code.

17. A wireless power transmission system, comprising:

a wireless power transmission apparatus comprising;

a primary core to transmit a wireless power signal during wireless charging; and

a transmission controller,

a wireless power receiving apparatus comprising;

a secondary core to receive the wireless power signal from the primary core;

a magnetic sensor to detect a magnetic field generated from the primary core for detecting a foreign object; and

a receiving controller to determine the foreign object is detected if the detected magnetic field value is lower than a reference magnetic field value, to determine the foreign object is not detected if the detected magnetic field value is equal to or greater than the reference magnetic field value, and to transmit an error code to the wireless power transmission apparatus if the detected magnetic field value is lower than the reference magnetic field value,

wherein the transmission controller stops the transmission of the wireless power signal if the error code has been received,

wherein the error code represents the foreign object is detected, and

wherein the transmission controller stops the transmission of the wireless power signal when the error code is not received from the wireless power receiving apparatus because of the communication with the wireless power receiving apparatus is not available.

18. The wireless power transmission system of claim 17, wherein the receiving controller transmits the error code through the secondary core to the primary core, and the transmission controller receives the error code from the primary core.