METHOD, SYSTEM AND APPARATUS TO OPTIMIZE A4WP WIRELESS CHARGING AND NFC CO-EXISTENCE
First Claim
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1. A power transmission unit (PTU), comprising:
- a controller having a processor circuitry and a memory circuitry;
a power amplifier for receiving an input to generate an amplified output;
a resonator coil in communication with the power amplifier, the resonator coil configured to generate an A4WP magnetic charging field and a secondary signal; and
a multiplexer in communication with the power amplifier and the resonator coil.
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Abstract
The disclosure relates generally to method, system and apparatus to optimize wireless charging to identify a proximal Near-Field Communication (NFC) tag and prevent damage by a magnetic wireless charging field. The disclosed embodiment provide different methods for NFC tag detection without impacting A4WP wireless charging. In an exemplary method, dedicated NFC reader is used to interleave the NFC and A4WP signals on the same coil. In one implementation the signals are frequency-multiplexed. In another implementation, the signals are time-multiplexed.
33 Citations
36 Claims
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1. A power transmission unit (PTU), comprising:
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a controller having a processor circuitry and a memory circuitry; a power amplifier for receiving an input to generate an amplified output; a resonator coil in communication with the power amplifier, the resonator coil configured to generate an A4WP magnetic charging field and a secondary signal; and a multiplexer in communication with the power amplifier and the resonator coil. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power transmission unit (PTU), comprising:
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a controller having a processor circuitry and a memory circuitry; a power amplifier for receiving an input to generate an amplified output; a resonator coil in communication with the power amplifier, the resonator coil configured to sequentially generate an A4WP magnetic charging field and an NFC polling signal; and a multiplexer in communication with the power amplifier and the resonator coil. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method to detect a Near-Field Communication (NFC) device proximal to a wireless charging station, comprising:
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generating an NFC signal and an NFC detection zone; generating a first magnetic field, the first magnetic field defining a charging zone to wirelessly charge an external device within the wireless charging zone; detecting presence of an NFC device at or near the NFC detection zone; generating a second magnetic field in response to detecting the NFC device; and confirming presence of the NFC device at or near the NFC detection zone while simultaneously generating the second magnetic field. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method to detect an NFC device proximal to a wireless charging station, comprising:
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generating a short beacon at a wireless charging station; detecting load modulation at the wireless charging station, the load modulation indicating presence of a proximal device; if the proximal device is detected, generating a long beacon; generating a Near-Field Communication (NFC) signal at a period subsequent to generating the short or the long beacon; and detecting a response to the NFC signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A computer-readable non-transitory storage medium that contains instructions, which when executed by one or more processors result in performing operations comprising:
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generating a short beacon at a wireless charging station; detecting load modulation at the wireless charging station, the load modulation indicating presence of a proximal device; if the proximal device is detected, generating a long beacon; generating a Near-Field Communication (NFC) signal at a period subsequent to generating the short or the long beacon; and detecting a response to the NFC signal. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
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Specification