| CPC H02J 50/80 (2016.02) [H02J 50/12 (2016.02); H04B 5/72 (2024.01); H04B 5/79 (2024.01)] | 9 Claims |
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1. A wireless power transmitter, comprising:
a power transmitter system coupled to a transmitter coil to provide wireless power to a power receiver, the power transmitter system includes a power transmit driver coupled to the transmit coil, an in-band communication coupled to the power transmit driver to send and receive data on the wireless power, a transmitter controller coupled to the power transmit driver and the in-band communication, and a first interface coupled to the transmitter controller; and
a near-field communications (NFC) module having an NFC driver coupled to a nearfield coil to communicate with a receiver NFC module of the power receiver, an NFC controller coupled to the NFC driver, and a second interface coupled to the NFC controller, the second interface configured to communicate through the first interface with the power transmitter system;
wherein the NFC controller operates the NFC module in a NFC OFF state, a NFC ENABLED state, or a NFC ACTIVE state, where transition between the NFC OFF state and the NFC ENABLED state and transition between the NFC ENABLED state and the NFC ACTIVE state are controlled by the NFC controller in response to one or more commands from the transmitter controller of the power transmitter system, the NFC module being configured to transmit data to the receiver NFC module of the power receiver or receive data from the receiver NFC module when in the NFC ACTIVE state,
wherein the transmitter controller of the power transmitter system is configured to direct the power transmitter driver to transfer power through the transmit coil to the power receiver, receive a power receiver ID from the power receiver using the in-band communication, and to transition the NFC module from the NFC Enabled state to the NFC ACTIVE state with the one or more commands,
wherein when the NFC controller operating the NFC module in the NFC ACTIVE state receives a data send command from the power transmitter system, the NFC controller directs the NFC driver to provide data to the power receiver in response to the data send command and receive response data from the power receiver,
wherein the data and the receive response data is related to wireless power transfer between the power transmitter system and the power receiver, the data and the response data including one or more of power transfer power control data, system information data, and authentication data, and
wherein the NFC controller of the NFC module of the wireless power transmitter is configured to detect presence of an NFC card in the absence of the power receiver and to communicate with the power transmitter system through the second interface and first interface to prevent wireless power transfer by the power the transmitter system when the NFC card is detected.
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