Patent ID: 9588163
Date: 2017-03-07
CPC Classifications: G01R,H02J

Claim:
1. A wireless power transmitting apparatus detecting a foreign object comprising: a primary core block coupled with a secondary core block equipped in a wireless power receiving apparatus through magnetic induction or magnetic resonance and configured for transmitting wireless power to the wireless power receiving apparatus by the magnetic induction or the magnetic resonance; an electric driver connected to the primary core block and configured for applying an alternating current (AC) signal required for the primary core block to transmit the wireless power; a controller connected to the electric driver and configured for generating a control signal for controlling the AC signal; and a current sensor configured for measuring an alternating current flowing into the primary core block, wherein the controller is configured to discover an object by using a primary coil included in the primary core block in a standby mode, to determine whether the object is the wireless power apparatus or not when the object is detected, to control the electric driver to apply the AC signal in a charging mode when it is determined that the object is the wireless power receiving apparatus, to obtain a current measurement value based on the measured alternating current by the current sensor, to determine that a foreign object is detected when the current measurement value exceeds a reference value, and to determine that no foreign object is detected when the current measurement value is below or equal to the reference value, and wherein the current measurement value is increased or decreased by power control of the wireless power transmitting apparatus according to a control error packet received from the wireless power receiving apparatus.