Wireless charger and method of charging an electronic device
AssigneeNoa the Brand Pty Ltd
InventorArvin Bayat
Life of this patent
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Abstract
A method for charging an electronic device and a wireless charger having a set of transmitter coils and a plurality of magnetic field sensors are disclosed. The method may comprise measuring magnetic fields in a predetermined charging region, detecting a change in the magnetic fields, and selecting the subset of the transmitter coils associated with the one of the magnetic field sensors. The method may further comprise energising each transmitter coil in the subset of the transmitter coils to transmit a predetermined maximum power output, selecting one transmitter coil from the subset of the transmitter coils, determining a first power output of said one transmitter coil, and energising said one transmitter coil to transmit at the first power output.
Claims17
A method for charging an electronic device having a receiver coil by a wireless charger having a set of transmitter coils and a plurality of magnetic field sensors, each of the magnetic field sensors associated with a subset of the transmitter coils, the method comprising:
- measuring, with the magnetic field sensors, magnetic fields in a predetermined charging region;
- detecting a change in the magnetic fields based on measurements by one of the magnetic field sensors indicative of the electronic device in the predetermined charging region;
- selecting the subset of the transmitter coils associated with said one of the magnetic field sensors;
- energising each transmitter coil in the subset of the transmitter coils to transmit a predetermined maximum power output for the receiver coil;
- calculating misalignment correction values between each transmitter coil in the subset of the transmitter coils and the receiver coil based on measurements by said one of the magnetic field sensors;
- calculating mutual inductances between each transmitter coil in the subset of the transmitter coils and the receiver coil based on respective misalignment correction values and measurements by said one of the magnetic field sensors;
- comparing the mutual inductances with a predetermined inductance range to select one transmitter coil from the subset of the transmitter coils;
- determining a first power output of said one transmitter coil based on the mutual inductance between said one transmitter coil and the receiver coil;
- and
- energising said one transmitter coil to transmit at the first power output for the receiver coil.
A wireless charger for charging an electronic device having a receiver coil, the wireless charger comprising:
- a housing having a charging surface and defining a predetermined charging region above the charging surface;
- a set of transmitter coils;
- a plurality of magnetic field sensors associated with a subset of the transmitter coils;
- a memory or a storage device configured to store processor-executable instructions;
- and
- a processor operatively connected to the memory or the storage device, the transmitter coils and the magnetic field sensors, the processor configured to execute the stored processor-executable instructions, wherein execution of the stored processor-executable instructions causes the processor to:
- measure magnetic fields in the predetermined charging region with the magnetic field sensors;
- detect a change in the magnetic fields based on measurements by one of the magnetic field sensors indicative of the electronic device in the predetermined charging region;
- select the subset of the transmitter coils associated with said one of the magnetic field sensors;
- energise each transmitter coil in the subset of the transmitter coils to transmit a predetermined maximum power output for the receiver coil;
- calculate misalignment correction values between each transmitter coil in the subset of the transmitter coils and the receiver coil based on measurements by said one of the magnetic field sensors;
- calculate mutual inductances between each transmitter coil in the subset of the transmitter coils and the receiver coil based on respective misalignment correction values and measurements by said one of the magnetic field sensors;
- compare the mutual inductances with a predetermined inductance range to select said one transmitter coil from the subset of the transmitter coils;
- determine a first power output of said one transmitter coil based on the mutual inductance between said one transmitter coil and the receiver coil;
- and
- energise said one transmitter coil to transmit at the first power output for the receiver coil.
Dependencies are inferred from the claim text.