METHOD FOR DETECTING LOAD IN WIRELESS CHARGING PRIORITY

• US 20150233990A1
• Filed: 02/19/2015
• Published: 08/20/2015
• Est. Priority Date: 02/19/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Kyung-Woo, LEE, Chong-Min, JUNG, Hee-Won, SONG, Keum-Su
• Granted Patent: US 9,853,481 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01R 19/16538 in AC or DC supplies G01R19/16519 and G01R19/16528 take precedence
• CPC Class Codes: G01R 21/133 by using digital technique
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: H02J 7/342 The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging with circuits for polarity protection H02J7/0034

Abstract

A method for detecting a load in wireless charging is provided. The method includes storing predetermined transmission signal waveform information, transmitting a signal according to the predetermined transmission signal waveform information, detecting a waveform change in the transmitted signal, and determining whether a device exists based on the detected waveform change.

Claims

1. A method for detecting a load in wireless charging, the method comprising:

storing predetermined transmission signal waveform information;

transmitting a signal according to the predetermined transmission signal waveform information;

detecting a waveform change in the transmitted signal; and

determining whether a device exists based on the detected waveform change.

2. The method of claim 1, wherein the predetermined transmission signal waveform information is waveform information relating to a current of a transmission signal.

3. The method of claim 1, wherein the predetermined transmission signal waveform information is waveform information relating to a voltage of a transmission signal.

4. The method of claim 1, wherein the predetermined transmission signal waveform information is waveform information relating to an open state without any load.

5. The method of claim 1, wherein detecting the waveform change comprises detecting a ramp-up within a predetermined time interval.

6. The method of claim 5, wherein the ramp-up occurs within a predetermined time interval that corresponds to a transmission time of the signal transmitted according to the predetermined transmission signal waveform information.

7. The method of claim 5, wherein the ramp-up occurs by charging a capacitive element of a wireless power receiver.

8. The method of claim 5, wherein if the ramp-up is detected within the predetermined time interval, it is determined that at least one wireless power receiver is located within a charging area.

9. The method of claim 1, further comprising determining a type of the device based on the detected waveform change.

10. The method of claim 1, further comprising determining whether the device is proximate to a charging area based on the detected waveform change.

11. A method for detecting a load in wireless charging, the method comprising:

storing predetermined transmission signal waveform information;

transmitting a signal according to the predetermined transmission signal waveform information;

detecting a waveform change in the transmitted signal; and

determining whether a device exists based on an occurrence time of the detected waveform change.

12. The method of claim 11, wherein the predetermined transmission signal waveform information is waveform information relating to a current of a transmission signal.

13. The method of claim 11, wherein the predetermined transmission signal waveform information is waveform information relating to a voltage of a transmission signal.

14. The method of claim 11, wherein the predetermined transmission signal waveform information is waveform information relating to an open state without any load.

15. The method of claim 11, wherein the occurrence time of the detected waveform change is determined by a capacitive element of a wireless power receiver.

16. The method of claim 11, further comprising determining a type of the device based on the detected waveform change.

17. The method of claim 16, wherein determining the type of the device further comprises determining the type of the device based on a category of a wireless power receiver.

18. The method of claim 11, further comprising determining whether a device is located proximate to a charging area based on the detected waveform change.

19. The method of claim 18, wherein it is determined whether the device is proximate to the charging area based on whether the detected waveform falls or rises relative to a waveform in an open state.

20. The method of claim 11, wherein the transmitted signal is a short beacon signal.