Nonlinear system identification for object detection in a wireless power transfer system
First Claim
1. A method of detecting whether a foreign object is near a transmit coil in a wireless power transfer system (WPTS), said method comprising:
- applying a pseudo-random signal to the transmit coil;
while the pseudo-random signal is being applied to the transmit coil, recording one or more signals produced within the WPTS in response to the applied pseudo-random signal;
by using the one or more recorded signals, generating a system model for some aspect of the WPTS;
using the generated system model in combination with stored training data to determine whether an object having characteristics recognizable from the stored training data as characteristic of the foreign object is near the transmit coil; and
if the object having characteristics recognizable from the stored training data as characteristic of the foreign object is near the transmit coil, preventing a wireless power transfer from taking place.
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Accused Products
Abstract
A method of detecting whether a foreign object is near a transmit coil in a wireless power transfer system (WPTS), the method involving: applying a pseudo-random signal to the transmit coil; while the pseudo-random signal is being applied to the transmit coil, recording one or more signals produced within the WPTS in response to the applied pseudo-random signal; by using the one or more recorded signals, generating a dynamic system model for some aspect of the WPTS; and using the generated dynamic system model in combination with stored training data to determine whether an object having characteristics recognizable from the stored training data as characteristic of the foreign object is near the transmit coil.
33 Citations
30 Claims
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1. A method of detecting whether a foreign object is near a transmit coil in a wireless power transfer system (WPTS), said method comprising:
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applying a pseudo-random signal to the transmit coil; while the pseudo-random signal is being applied to the transmit coil, recording one or more signals produced within the WPTS in response to the applied pseudo-random signal; by using the one or more recorded signals, generating a system model for some aspect of the WPTS; using the generated system model in combination with stored training data to determine whether an object having characteristics recognizable from the stored training data as characteristic of the foreign object is near the transmit coil; and if the object having characteristics recognizable from the stored training data as characteristic of the foreign object is near the transmit coil, preventing a wireless power transfer from taking place. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A wireless power transfer system comprising:
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a transmit coil; a power transmitter circuit connected to the transmit coil; a sensor circuit connected to the transmit coil; and a controller for controlling the power transmitter circuit and the sensor circuit, wherein said controller includes a memory storing training data characterizing a foreign object near the transmit coil and a processor system programmed to; cause the power transmitter circuit to apply a pseudo-random signal to the transmit coil; while the pseudo-random signal is being applied to the transmit coil, cause the sensor circuit to record one or more signals produced within the WPTS in response to the applied pseudo-random signal; by using the one or more recorded signals, generate a system model for some aspect of the WPTS; use the generated system model in combination with stored training data to determine whether an object having characteristics recognizable from the stored training data as characteristic of the foreign object is near the transmit coil; and if the object having characteristics recognizable from the stored training data as characteristic of the foreign object is near the transmit coil, prevent a wireless power transfer from taking place. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification