Wireless power systems with interference mitigation
AssigneeApple Inc.
InventorsSujeet Milind Patole, Cheung-Wei Lam, Vaneet Pathak
Life of this patent
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Abstract
A wireless power system has a wireless power transmitting device and a wireless power receiving device. A clock signal may be provided to inverter circuitry in wireless power transmitting circuitry at a power transmission frequency. The clock signal may cause transistors in the inverter circuitry to turn on and off to create AC current signals through the wireless power transmitting coil. The clock signal may be processed to mitigate electromagnetic interference in the system.
Claims23
A wireless power transmitting device configured to provide wireless power to a wireless power receiving device, comprising:
- wireless power transmitting circuitry having an inverter and a wireless power transmitting coil, wherein the inverter is configured to receive a clock signal and supply corresponding alternating-current drive signals to the wireless power transmitting coil;
- and
- control circuitry configured to frequency dither the clock signal provided to the inverter, wherein frequency dithering the clock signal comprises:
- determining a modulating waveform based at least partly on operating characteristics indicating a type of the wireless power receiving device;
- and
- modulating the clock signal using the modulating waveform.
A non-transitory computer-readable storage medium storing one or more programs configured to be executed by one or more processors of a wireless power transmitting device that is configured to provide wireless power to a wireless power receiving device, wherein the wireless power transmitting device comprises wireless power transmitting circuitry having an inverter and a wireless power transmitting coil and wherein the inverter is configured to receive a clock signal and supply corresponding alternating-current drive signals to the wireless power transmitting coil, the one or more programs including instructions for:
- frequency dithering the clock signal provided to the inverter, wherein frequency dithering the clock signal comprises:
- determining a modulating waveform based at least partly on operating characteristics indicating a type of the wireless power receiving device;
- and
- modulating the clock signal using the modulating waveform.
A method of operating a wireless power transmitting device that is configured to provide wireless power to a wireless power receiving device, wherein the wireless power transmitting device comprises wireless power transmitting circuitry having an inverter and a wireless power transmitting coil and wherein the inverter is configured to receive a clock signal and supply corresponding alternating-current drive signals to the wireless power transmitting coil, the method comprising:
- frequency dithering the clock signal provided to the inverter, wherein frequency dithering the clock signal comprises:
- determining a modulating waveform based at least partly on operating characteristics indicating a type of the wireless power receiving device;
- and
- modulating the clock signal using the modulating waveform.
Dependencies are inferred from the claim text.