Electronic device and foreign object detection method for electronic device

Patent metadata

Field	Value
Publication number	US-10686338-B2
Application number	US-201716473921-A
Country	US
Kind code	B2
Filing date	Dec 21, 2017
Priority date	Dec 26, 2016
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

According to various embodiments, an electronic device comprises: a near-field communication unit; and a control unit electrically connected to the near-field communication unit, wherein the control unit can be configured to detect whether a foreign object is located between the electronic device and a first electronic device by using the near-field communication unit before performing wireless charging with the first electronic device which provides power wirelessly.

First claim

The invention claimed is:

1. An electronic device comprising:
a short-range communication unit; and
a controller electrically coupled to the short-range communication unit,
wherein the controller is configured to:
identify whether a foreign object is located between the electronic device and a first electronic device supplying wireless power by means of the short-range communication unit, before performing wireless charging with the first electronic device, and
upon detection of the foreign object, display information indicating the detection of the foreign object and transmit a signal requesting discontinuation of the charging to the first electronic device.

2. The electronic device of claim 1 , wherein the controller is configured to:
activate the short-range communication unit, before transmitting communication information of the electronic device corresponding to wireless charging initiation to the first electronic device, and
detect the foreign object through a connection between the activated short-range communication unit and a short-range communication unit included in the foreign object.

3. The electronic device of claim 2 , wherein the controller is configured to:
detect a transmission interval for the communication information based on a type of a wireless charging chip of the electronic device,
detect the foreign object by activating the short-range communication unit during the transmission interval of the communication information,
transmit the communication information to the first electronic device, when the foreign object is not detected until expiration of the transmission interval of the communication information, and
perform wireless charging with the first electronic device, and

wherein the communication information of the electronic device is a communication packet.

4. The electronic device of claim 1 , further comprising a memory configured to store transmission intervals for communication information of the electronic device according to types of wireless charging chips.

5. The electronic device of claim 1 , wherein when the controller identifies that an accessory cover mounted on the electronic device is opened before wireless charging is performed with the first electronic device, the controller is configured to identify whether the foreign object is located between the electronic device and the first electronic device by means of the short-range communication unit.

6. The electronic device of claim 1 , wherein the electronic device includes a first mode for performing low-power wireless charging and a second mode for performing mid-power wireless charging, and
wherein the controller is configured to identify whether the foreign object is located between the electronic device and the first electronic device by means of the short-range communication unit, while awaiting charging in the second mode, before wireless charging is performed with the first electronic device.

7. The electronic device of claim 1 , wherein the controller is configured to, upon detection of the foreign object, transmit a signal requesting charge current drop to the first electronic device.

8. A method of detecting a foreign object in an electronic device, the method comprising:
activating a short-range communication unit before wireless charging is performed with a first electronic device supplying wireless power;
identifying whether a foreign object is located between the electronic device and the first electronic device by means of the short-range communication unit; and
upon detection of the foreign object, displaying information indicating the detection of the foreign object and transmitting a signal requesting discontinuation of the charging or a signal requesting charge current drop to the first electronic device.

9. The method of claim 8 , wherein activating the short-range communication unit comprises:
detecting a transmission interval for communication information corresponding to wireless charging initiation based on a type of a wireless charging chip of the electronic device, before transmitting the communication information of the electronic device is transmitted to the first electronic device; and
detecting the foreign object by activating the short-range communication unit during the transmission interval of the communication information.

10. The method of claim 9 , wherein detecting the foreign object comprises:
detecting the foreign object by a connection between the activated short-range communication unit and a short-range communication unit included in the foreign object;
transmitting the communication information to the first electronic device, when the foreign object is not detected until expiration of the transmission interval of the communication information; and
performing wireless charging with the first electronic device, and
wherein the communication information of the electronic device is a communication packet.

11. The method of claim 9 , wherein detecting the transmission interval for communication information comprises:
detecting the transmission interval of the communication information based on the type of the wireless charging chip of the electronic device from a memory storing transmission intervals for communication information of the electronic device according to types of wireless charging chips.

12. The method of claim 8 , further comprising:
when opening of an accessory cover mounted on the electronic device is identified before wireless charging is performed with the first electronic device,
identifying whether the foreign object is located between the electronic device and the first electronic device by means of the short-range communication unit.

13. The method of claim 8 , further comprising:
when the electronic device includes a first mode for performing low-power wireless charging and a second mode for performing mid-power wireless charging, identifying whether the foreign object is located between the electronic device and the first electronic device by means of the short-range communication unit, while awaiting charging in the second mode, before wireless charging is performed with the first electronic device.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Jong-Won
• Kim Na-Hyang
• Kim Yong-Youn
• Park Soon
• Choi Eun-Hee

Classifications

• H02J7/47

  Arrangements for checking compatibility or authentication between one component, e.g. a battery or a battery charger, and another component, e.g. a power source · CPC title

• H02J50/60 Primary

  responsive to the presence of foreign objects, e.g. detection of living beings · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title

• H04M2201/34

  Microprocessors · CPC title

• H04M1/725

  Cordless telephones (user interfaces specially adapted therefor H04M1/724) · CPC title