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US 2018/0123399 A1Published application
Inductive power transfer
AssigneeApple Inc.
InventorRobert Walton
Life of this patent
Estimating the term…
Abstract
An IPT receiver is controlled to vary its frequency of operation to hop between a first frequency below the transmitter frequency and a second frequency above the transmitter frequency while measuring the power transfer at both first and second frequencies. Embodiments may track variations in transmitter frequency.
Claims17
An inductive power receiver comprising:
- a controller for varying a frequency of operation of the receiver, the controller configured to set the frequency of operation to a first higher frequency and to a second lower frequency, and to vary the first and second frequencies until powers transferred to the receiver at the first and second frequencies are within a threshold difference.
A method of operating a receiver for an IPT system comprising
- operating a receiver at a first lower frequency and at a second higher frequency,
- sensing the power transferred at each frequency, and
- varying the first and second frequencies until the powers transferred are within a threshold difference.
Dependencies are inferred from the claim text.