US 11,146,120 B2 · Apparatus and method for performing wireless power transmission on basis of foreign material detection

Abstract

The present specification provides a wireless power reception apparatus comprising: a power pick-up unit configured to receive wireless power from a wireless power transmission apparatus by magnetic coupling with the wireless power transmission apparatus and convert an AC signal generated by the wireless power into a DC signal; a communication/control unit configured to receive the DC signal from the power pick-up unit and control the wireless power; and a load configured to receive the DC signal from the power pick-up unit. When foreign material is detected before power transmission, wireless power transmission is sustained on the basis of a safe basic power profile of 5 W or less, without interrupting power transmission, and thus, a charging delay can be prevented and the accuracy and reliability of detection of foreign material can be increased despite individual characteristics of the wireless power reception apparatus.

Claims15

Dependent claims

An apparatus for receiving wireless power from a wireless power transmitting apparatus based on foreign object detection in a wireless power transmitting system, the apparatus comprising:

a power pick-up unit configured to receive wireless power from the wireless power transmitting apparatus via magnetic coupling with the wireless power transmitting apparatus, and to convert an alternating current (AC) signal generated from the wireless power to a direct current (DC) signal;
and
a communication/control unit configured to:
receive the direct current (DC) signal from the power pick-up unit and to perform control of the wireless power,
transmit a foreign object detection (FOD) status packet including a reported quality factor value to the wireless power transmitting apparatus,
receive ACK/NAK response information as a response to the foreign object detection status packet from the wireless power transmitting apparatus, and
in case the ACK/NAK response information informs NAK, allow the wireless power to be received based on a baseline power profile (BPP).

4 more elements

An apparatus for transmitting wireless power to a wireless power receiving apparatus based on foreign object detection in a wireless power transmitting system, the apparatus comprising:

a power conversion unit configured to transmit wireless power to the wireless power receiving apparatus via magnetic coupling with the wireless power receiving;
and
a communication/control unit configured to:
measure a quality factor value for the wireless power receiving apparatus before transmitting the wireless power to the wireless power receiving apparatus,
receive a foreign object detection (FOD) status packet including a reported quality factor value from the wireless power receiving apparatus,
perform initial foreign object detection based on the measured quality factor value and the reported quality factor value,
transmit ACK/NAK response information for the foreign object detection (FOD) status packet based on a result of performing the initial foreign object detection to the wireless power receiving apparatus, and
in case a foreign object is detected by performing the initial foreign object detection, configure the ACK/NAK response information to NAK and allow the wireless power to be transmitted based on the baseline power profile (BPP).

5 more elements

Dependencies are inferred from the claim text.

Apparatus and method for performing wireless power transmission on basis of foreign material detection

Life of this patent

Apparatus and method for performing wireless power transmission on basis of foreign material detection

Life of this patent

Abstract

Claims15