Wireless power transmitter, wireless power receiver, and control methods thereof

• US 9,722,446 B2
• Filed: 03/24/2014
• Issued: 08/01/2017
• Est. Priority Date: 03/22/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Jung, Soo-Yeon, Kwon, Hyuk-Choon, Kim, Nam-Yun, Jung, Hee-Won
• Primary Examiner(s): Lin, Sun
• Application Number:
  US14/223,147
• Publication Number:
  US 20140285143A1
• Time in Patent Office: 1,226 Days
• Field of Search: 320108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• 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

Abstract

A control method of a wireless power transmitting unit transmitting charging power to a wireless power receiving unit is provided. The control method includes receiving first signals from one or more wireless power receiving units; classifying wireless power receiving units to be communicated with from among the one or more wireless power receiving units based on reception intensities of the received first signals; transmitting wireless transmission power with predetermined level; receiving second signals including voltage information of the classified wireless power receiving units from the classified wireless power receiving units; and communicating with one or more wireless power receiving unit among the classified wireless power receiving units based on the wireless transmission power and the voltage information of the second signals.

Claims

1. A method for controlling a wireless power transmitter configured to transmit power to a wireless power receiver, the method comprising:

applying a detection power for detecting change in a load of the wireless power transmitter caused by a placement of the wireless power receiver;

detecting the change in the load of the wireless power transmitter;

determining whether a first signal from the wireless power receiver is received or not within a predetermined time after detecting the change in the load of the wireless power transmitter; and

transmitting a second signal to the wireless power receiver if the first signal from the wireless power receiver is received within the predetermined time after detecting the change in the load of the wireless power transmitter and a reception intensity of the first signal is greater than a threshold.

2. The method of claim 1, further comprising:

determining whether the reception intensity of the first signal is greater than the threshold or not.

3. The method of claim 2, wherein the determining whether the reception intensity of the first signal is greater than the threshold or not comprises:

identifying a minimum reception intensity;

setting a determination range based on the minimum reception intensity; and

determining whether the reception intensity of the first signal is within the determination range.

4. The method of claim 3, wherein the identifying a minimum reception intensity comprises:

identifying the minimum reception intensity from among first signals received from a plurality of wireless power receivers.

5. The method of claim 1, wherein the second signal is arranged such that the wireless power receiver performs a joining operation to transmit the power.

6. A wireless power transmitter configured to transmit power to a wireless power receiver, the wireless power transmitter comprising:

a resonant signal generator configured to transmit the power to the wireless power receiver;

a controller configured to apply a detection power for detecting change in a load of the wireless power transmitter caused by a placement of the wireless power receiver to the resonant signal generator, and detect the change in the load of the wireless power transmitter; and

a wireless communication unit configured to receive a first signal from the wireless power receiver,

wherein the controller is configured to control transmitting a second signal to the wireless power receiver if the first signal from the wireless power receiver is received within a predetermined time after detecting the change in the load of the wireless power transmitter and a reception intensity of the first signal is greater than a threshold.

7. The wireless power transmitter of claim 6, wherein the controller is further configured to determine whether the reception intensity of the first signal is greater than the threshold or not.

8. The wireless power transmitter of claim 6, wherein, the second signal is arranged such that the wireless power receiver performs a joining operation to transmit the power.

9. The wireless power transmitter of claim 6, wherein the controller is further configured to:

identify a minimum reception intensity;

set a determination range based on the minimum reception intensity; and

determine whether the reception intensity of the first signal is within the determination range.