METHOD OF GENERATING LOAD VARIATION FOR DETECTING WIRELESS POWER RECEIVING UNIT IN WIRELESS CHARGING, AND WIRELESS POWER RECEIVING UNIT

• US 20140361738A1
• Filed: 06/05/2014
• Published: 12/11/2014
• Est. Priority Date: 06/05/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Kyung-Woo, BYUN, Kang-Ho, JUNG, Hee-Won, HA, Min-Cheol, LEE, Chong-Min, HAN, Seung-Woo
• Granted Patent: US 9,806,554 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H02J 50/12 of the resonant type
• 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 7/0048 Detection of remaining charge capacity or state of charge [SOC]

Abstract

A method for generating a load variation for detecting a wireless power receiving unit in wireless charging is provided. The method includes maintaining a switch connected to a dummy load in an ON state by the wireless power receiving unit, receiving wireless power from a wireless power transmitting unit, and, upon receiving the wireless power, switching the switch connected to the dummy load to an OFF state.

Claims

1. A method of generating a load variation for detecting a wireless power receiving unit in wireless charging, the method comprising:

maintaining a switch connected to a dummy load in an ON state by the wireless power receiving unit;

receiving wireless power from a wireless power transmitting unit; and

upon receiving the wireless power, switching the switch connected to the dummy load to an OFF state.

2. The method of claim 1, wherein the power received from the wireless power transmitting unit is power that is transmitted by a short beacon signal.

3. The method of claim 2, further comprising receiving a long beacon signal transmitted from the wireless power transmitting unit, after the switch is switched to the OFF state.

4. The method of claim 1, further comprising:

after receiving the wireless power from the wireless power transmitting unit, turning on power to a controller of the wireless power receiving unit; and

switching, by the controller, the switch connected to the dummy load to the OFF state.

5. The method of claim 1, further comprising:

after receiving wireless power from the wireless power transmitting unit, turning on power to a controller of the wireless power receiving unit;

switching, by the controller, the switch connected to the dummy load to the OFF state; and

transmitting an advertisement message to the wireless power transmitting unit.

6. The method of claim 1, further comprising:

after receiving wireless power from the wireless power transmitting unit, turning on power to a controller of the wireless power receiving unit; and

transmitting an advertisement message to the wireless power transmitting unit and

switching, by the controller, the switch connected to the dummy load to the OFF state.

7. A method of generating a load variation for detecting a wireless power receiving unit in wireless charging, the method comprising:

maintaining a switch connected to a dummy load in an OFF state by the wireless power receiving unit;

receiving, from a wireless power transmitting unit, a time set value that is set for checking for a cross connection;

switching the switch connected to the dummy load to an ON state according to the received time set value; and

switching the switch connected to the dummy load to the OFF state, upon a lapse of time equal to the received time set value.

8. A wireless power receiving unit for generating a load variation in wireless charging, the wireless power receiving unit comprising:

a power receiver configured to receive wireless power from a wireless power transmitting unit;

a dummy load connected in parallel between the power receiver and a load of the wireless power receiving unit;

a dummy load switch configured to switch power to the dummy load; and

a controller configured to generate a load variation of the wireless power receiving unit by turning the dummy load switch to an ON state or an OFF state.

9. The wireless power receiving unit of claim 8, further comprising a rectifier configured to rectify Alternating Current (AC) power received from the power receiver into a Direct Current (DC) power;

and

wherein the dummy load is connected to the rectifier in parallel.

10. The wireless power receiving unit of claim 9, wherein the dummy load includes at least one capacitor.

11. The wireless power receiving unit of claim 8, further comprising:

a rectifier configured to rectify AC power received from the power receiver into DC power; and

a converter configured to convert the DC power rectified by the rectifier to a power level to be supplied to the load of the wireless power receiving unit;

wherein the dummy load is connected to the converter in parallel.

12. The wireless power receiving unit of claim 11, wherein the dummy load includes at least one resistor.

13. The wireless power receiving unit of claim 8, wherein the power received from the wireless power transmitting unit is power that is transmitted by a short beacon signal.

14. The wireless power receiving unit of claim 8, wherein power to the controller is turned on by the wireless power received from the wireless power transmitting unit, and the controller is configured to switch the dummy load switch to the OFF state when the power to the controller is turned on.

15. The wireless power receiving unit of claim 14, wherein the controller is configured to transmit a message to the wireless power transmitting unit after switching the dummy load switch to the OFF state.

16. The wireless power receiving unit of claim 8, wherein power to the controller is turned on by the wireless power received from the wireless power transmitting unit, and the controller is configured to, as the power to the controller is turned on, transmit a message to the wireless power transmitting unit and switch the dummy load switch to the OFF state.

17. The wireless power receiving unit of claim 8, wherein the controller is configured to receive, from the wireless power transmitting unit, a time set value that is set for checking for a cross connection, and to switch the dummy load switch to the ON state in accordance with the received time set value.