Apparatus and method for detecting foreign object in wireless power transmitting system

摘要

An apparatus and method for detecting a foreign object in a wireless power transmitting system are provided. In a case in which a foreign object is not detected prior to charging, an attempt to detect a foreign object detection during charging is performed, and when a foreign object is not detected while a power signal is being received, power is limited based on a temperature sensor.

主权项

1. A method of detecting a foreign object using at least one processor included in a wireless power receiving apparatus, the method comprising:
performing a first operation of foreign object detection prior to an initial charging; performing a second operation of foreign object detection during charging if the foreign object is not detected by the first operation of foreign object detection prior to the initial charging; and performing a third operation of foreign object detection by temperature sensor if the foreign object is not detected by the second operation of foreign object detection during charging, wherein the first operation of foreign object detection prior to the initial charging comprises: receiving a power signal at an operating point from a wireless power transmitting apparatus which performs digital ping in a ping phase; generating a signal strength packet indicating strength of the power signal at the operating point and transmitting the signal strength packet to the wireless power transmitting apparatus; generating an identification packet indicating a unique ID of the wireless power receiving apparatus and configuration information of the wireless power receiving apparatus, and transmitting the identification packet and the configuration information to the wireless power transmitting apparatus; measuring a received power and setting an initial voltage; checking whether the wireless power receiving apparatus is charging; comparing a required power value with the received power, generating a power control packet based on the comparison result, and transmitting the generated power control packet to the wireless power transmitting apparatus, if the wireless power receiving apparatus is charging; checking whether the initial voltage is in a hold state and a steady state value of the initial voltage is within a predetermined reference voltage range, if the wireless power receiving apparatus is not charging; and generating a foreign object state packet, and transmitting the foreign object state packet to the wireless power transmitting apparatus, if the initial voltage is in a hold state and the steady state value of the initial voltage is within the predetermined reference voltage range.