APPARATUS AND METHOD FOR REDUCING NOISE OF A WIRELESS CHARGING DEVICE

• US 20170117741A1
• Filed: 07/27/2016
• Published: 04/27/2017
• Est. Priority Date: 10/21/2015
• Status: Abandoned Application

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Inventors: LEE, Jeong Kee, CHO, Kil Sang, CHUNG, Wung Chul
• Application Number:
  US15/220,576
• Publication Number:
  US 20170117741A1
• Time in Patent Office: Days
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

The present disclosure relates to an apparatus and a method for reducing noise generated in a wireless charging device. A method for reducing noise in a wireless charging device may include: outputting a pulse of a first voltage to a first coil in a first period and monitoring a variation in a response current according to feedback of the output pulse to check whether an object is located on the wireless charging device; checking whether communication with the object is possible when the object is located on the wireless charging device; and, when communication with the object is not possible, outputting a pulse of a second voltage lower than the first voltage to the first coil in the first period to check whether the object is located on the wireless charging device. Accordingly, noise generated in the wireless charging device can be reduced.

Claims

1. A method for reducing noise in a wireless charging device, comprising:

outputting a pulse of a first voltage to a first coil in a first period and monitoring a variation in a response current according to feedback of the output pulse to check whether an object is located on the wireless charging device;

checking whether communication with the object is possible when the object is located on the wireless charging device; and

when communication with the object is not possible, outputting a pulse of a second voltage lower than the first voltage to the first coil in the first period to check whether the object is located on the wireless charging device.

2. The method according to claim 1, further comprising transferring power to the object in a second period when communication with the object is possible.

3. The method according to claim 1, wherein the response current corresponds to an output current of a feedback reception circuit of the wireless charging device.

4. The method according to claim 1, wherein the communication is performed based on one of Wireless Power Consortium (WPC) or Power Matters Alliance (PMA) standards.

5. The method according to claim 4, wherein the checking of whether communication with the object is possible comprises checking whether a response signal to an identification signal transmitted to identify whether the object is a terminal applicable to one of the WPC or PMA standards is received from the object within a predetermined time.

6. The method according to claim 5, wherein the checking of whether communication with the object is possible comprises checking whether the response signal is received in a third period.

13. A computer readable recording medium storing a program for executing the method according to one of claim 1.

7. A wireless charging device, comprising:

a controller configured to control a period and voltage of a pulse output to a first coil;

an object recognition unit configured to check whether an object is located on the wireless charging device by monitoring a variation in a response current according to feedback of the output pulse; and

a communication unit configured to perform communication with the object,

wherein the controller is configured to control a second voltage lower than a first voltage of the pulse output to the first coil to be output when communication with the object is impossible.

8. The wireless charging device of claim 7, wherein the controller is configured to check whether communication with the object is possible by checking whether a response signal is received within a predetermined time.

9. The wireless charging device of claim 7, further comprising an inductive power transmitter configured to transfer power to the object in a second period.

10. The wireless charging device of claim 7, wherein the response current corresponds to an output current of a feedback reception circuit of the wireless charging device.

11. The wireless charging device of claim 7, wherein the communication is performed based on one of Wireless Power Consortium (WPC) or Power Matters Alliance (PMA) standards.

12. The wireless charging device according to claim 7, wherein the controller configured to check whether communication with the object is possible by receiving a response signal to an identification signal transmitted by the communication unit to identify whether the object is a terminal applicable to one of the WPC and PMA standards from the object within a predetermined time.