WIRELESS CHARGING TRANSMITTER USING CAPACITIVE SENSING FOR DEVICE DETECTION
First Claim
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1. A wireless power transmitter comprising:
- an object-sensing circuit configured to;
receive a first signal from an object sensor that is separate from a transmit coil of the wireless power transmitter, wherein applying power to the transmit coil is not required to activate the object sensor;
process the first signal to determine a proximity of an object to the wireless power transmitter; and
provide a control signal to activate the transmit coil in response to determining proximity of the object.
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Abstract
Apparatus and methods for detecting the presence of a wireless power receiving device to be charged by a wireless power transmitter are described. A first low-power sensing apparatus and method may be used to detect the presence of a device placed in a charging area of the wireless power transmitter. A second sensing apparatus and method may be used to confirm the presence of a device placed in a charging area, and initiate charging of the device.
37 Citations
21 Claims
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1. A wireless power transmitter comprising:
an object-sensing circuit configured to; receive a first signal from an object sensor that is separate from a transmit coil of the wireless power transmitter, wherein applying power to the transmit coil is not required to activate the object sensor; process the first signal to determine a proximity of an object to the wireless power transmitter; and provide a control signal to activate the transmit coil in response to determining proximity of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for sensing an object in a proximity of a wireless power transmitter, the method comprising:
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operating the wireless power transmitter in a standby mode; activating an object-sensing circuit, wherein the activating does not require applying power to a transmit coil of the wireless power transmitter; processing a first signal from an object sensor; determining from the first signal a proximity of an object to the wireless power transmitter; and responsive to determining the proximity of the object, providing a second signal to activate the transmit coil of the wireless power transmitter. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification