Apparatus and method for performing wireless power transmission on basis of out-band communication in wireless power transmission system

Patent metadata

Field	Value
Publication number	US-12095525-B2
Application number	US-202017436450-A
Country	US
Kind code	B2
Filing date	Jan 14, 2020
Priority date	Mar 3, 2019
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

According to one aspect of the present disclosure, a wireless power receiver for receiving wireless power on the basis of out-band communication is provided. The receiver comprises: a power pick-up circuit configured to receive wireless power from a wireless power transmitter at an operating frequency; and a communication/control circuit configured to perform at least one of in-band communication using the operating frequency and out-band communication using a frequency other than the operating frequency. Here, on the basis of at least one of the received voltage in the power pick-up circuit and a received signal strength indicator (RSSI) of a first signal related to the out-band communication, the communication/control circuit may perform a power interruption procedure for interrupting transmission of the wireless power and a disconnection procedure for releasing the connection of the out-band communication.

First claim

What is claimed is:

1. A wireless power receiver configured to receive wireless power based on out-band communication, the wireless power receiver comprising:
a power pick-up circuit being configured to receive wireless power from a wireless power transmitter via magnetic coupling with the wireless power transmitter in an operating frequency and to convert an alternating current signal being generated by the wireless power to a direct current signal;
a communication/control circuit being configured to be supplied with the direct current signal from the power pick-up circuit and to perform at least one of in-band communication using the operating frequency or out-band communication using frequencies other than the operating frequency; and
a load being configured to be supplied with the direct current signal from the power pick-up circuit,
wherein, based on at least one of a received signal strength indicator (RSSI) of a first signal related to the out-band communication or a received voltage, the communication/control circuit performs an end power procedure stopping wireless power transmission and a link disconnection procedure disconnecting an out-band communication connection,
wherein the received voltage is a voltage of a secondary coil being equipped in the power pick-up circuit,
wherein the end power procedure comprises the steps of:
transmitting, by the communication/control circuit, to the wireless power transmitter, power stop request information requesting the wireless power transmission to be stopped, and
receiving, by the communication/control circuit, from the wireless power transmitter, power stop response information indicating that the wireless power transmission has been stopped,

wherein the communication/control circuit performs the end power procedure and the link disconnection procedure, based on that the RSSI of the first signal becomes lower than a first signal threshold value, and based on that the received voltage becomes lower than a first voltage threshold value, and
wherein the end power procedure is performed based on the out-band communication.

2. The wireless power receiver of claim 1 , wherein the communication/control circuit performs the end power procedure and the link disconnection procedure, based on that the RSSI of the first signal becomes lower than a first signal threshold value, and
wherein the end power procedure is performed based on the out-band communication.

3. The wireless power receiver of claim 1 , wherein the communication/control circuit periodically measures the RSSI of the first signal and estimates a distance between the wireless power transmitter and the wireless power receiver, based on the RSSI of the first signal.

4. The wireless power receiver of claim 3 , wherein the communication/control circuit is configured to adaptively adjust an advertising interval according to out-band communication based on the estimated distance.

5. The wireless power receiver of claim 4 , wherein, based on that the estimated distance is in a range where wireless power transmission and in-band communication are not available, the communication/control circuit configures the advertising interval as a first interval,
wherein, based on that the estimated distance is in a range where wireless power transmission and in-band communication are not available, and based on that out-band communication is available, the communication/control circuit configures the advertising interval as a second interval,
wherein, based on that the estimated distance is in a range where wireless power transmission and in-band communication are available, the communication/control circuit configures the advertising interval as a third interval, and
wherein the first interval is longer than the second interval, and the second interval is longer than the third interval.

6. A method of receiving wireless power by a wireless power receiver based on out-band communication, the method comprising:
receiving, through a power pick-up circuit, wireless power from a wireless power transmitter via magnetic coupling with the wireless power transmitter in an operating frequency and to convert an alternating current signal being generated by the wireless power to a direct current signal;
supplying a communication/control circuit with the direct current signal from the power pick-up circuit and performing, by the communication/control circuit, at least one of in-band communication using the operating frequency or out-band communication using frequencies other than the operating frequency; and
supplying a load with the direct current signal from the power pick-up circuit,
wherein, based on at least one of a received signal strength indicator (RSSI) of a first signal related to the out-band communication or a received voltage, the communication/control circuit performs an end power procedure stopping wireless power transmission and a link disconnection procedure disconnecting an out-band communication connection,
wherein the received voltage is a voltage of a secondary coil being equipped in the power pick-up circuit,
wherein the end power procedure comprises the steps of:
transmitting, by the communication/control circuit, to the wireless power transmitter, power stop request information requesting the wireless power transmission to be stopped, and
receiving, by the communication/control circuit, from the wireless power transmitter, power stop response information indicating that the wireless power transmission has been stopped,

wherein the communication/control circuit performs the end power procedure and the link disconnection procedure, based on that the RSSI of the first signal becomes lower than a first signal threshold value, and based on that the received voltage becomes lower than a first voltage threshold value, and
wherein the end power procedure is performed based on the out-band communication.

7. The method of claim 6 , wherein the communication/control circuit performs the end power procedure and the link disconnection procedure, based on that the RSSI of the first signal becomes lower than a first signal threshold value, and
wherein the end power procedure is performed based on the out-band communication.

8. The method of claim 6 , wherein the communication/control circuit periodically measures the RSSI of the first signal and estimates a distance between the wireless power transmitter and the wireless power receiver, based on the RSSI of the first signal.

9. The method of claim 8 , wherein the communication/control circuit adaptively adjusts an advertising interval according to out-band communication based on the estimated distance.

10. The method of claim 9 , wherein, based on that the estimated distance is in a range where wireless power transmission and in-band communication are not available, the communication/control circuit configures the advertising interval as a first interval,
wherein, based on that the estimated distance is in a range where wireless power transmission and in-band communication are not available, and based on that out-band communication is available, the communication/control circuit configures the advertising interval as a second interval,
wherein, based on that the estimated distance is in a range where wireless power transmission and in-band communication are available, the communication/control circuit configures the advertising interval as a third interval, and
wherein the first interval is longer than the second interval, and the second interval is longer than the third interval.

Assignees

• Lg Electronics Inc

Inventors

• Lee Minsoo
• Kim Jaehyu
• Lim Jinkwon
• Choi Jingu

Classifications

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04W76/30

  Connection release · CPC title

• H02J50/40

  using two or more transmitting or receiving devices (H02J50/50 takes precedence) · CPC title

• H02J50/12

  of the resonant type · CPC title

• H02J7/02

  for charging batteries from AC mains by converters · CPC title