Apparatus and method for detecting foreign object in wireless power transmitting system
First 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, andwherein 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.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention is related to an apparatus and method for detecting a foreign object in a wireless power transmitting system. Specifically, a wireless power transmitting apparatus includes a primary core block which transmits wireless power to a wireless power receiving apparatus through magnetic induction or magnetic resonance; an electric driving unit applying an AC (Alternating Current) signal required for the primary core block to transmit the wireless power; a control unit being connected to the electric driving unit and generating a control signal for controlling the AC signal; and a current measurement unit measuring a current flowing into the primary core block and obtaining a current measurement value converted to a numeric value relevant for the control unit to analyze the current.
9 Citations
19 Claims
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1. A wireless power transmitting apparatus detecting a foreign object comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for detecting a foreign object using a wireless power transmitting apparatus equipped with a primary core block, the method comprising:
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discovering an object by using a primary coil included in the primary core block in a standby mode; determining whether the object is a wireless power receiving apparatus or not if-when the object is detected; applying an alternating current (AC) signal required for transmitting wireless power to the primary core block in a charging mode when it is determined that the object is the wireless power receiving apparatus; transmitting the wireless power to the wireless power receiving apparatus by coupling a secondary core block equipped in the wireless power receiving apparatus with the primary core block through magnetic induction or magnetic resonance in the charging mode; measuring an alternating current flowing into the primary core block by using a current sensor included in the wireless power transmitting apparatus in the charging mode; obtaining a current measurement value based on a measured alternating current by the current sensor; and determining that a foreign object is detected when the current measurement value exceeds a reference value and determining no foreign object is detected when the current measurement value is below or equal to the reference value, 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification