Combining power from multiple resonance magnetic receivers in resonance magnetic power system
AssigneeApple Inc.
InventorsLi-Quan Tan, David T. Amm
Life of this patent
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Abstract
Various embodiments of a wirelessly powered local computing environment are described. A system and method for utilizing wireless near field magnetic resonance (NFMR) power transmission in a computing environment. A small form factor wireless power unit can be used to replace conventional batteries.
Claims25
A wireless power unit arranged to provide at least a minimum amount of power to a device wirelessly received from a magnetic field provided by a near field magnetic resonance (NFMR) transmitter unit having a resonance frequency ωT, the minimum amount of power delivered to the device being independent of a spatial orientation of the portable power unit with respect to the magnetic field, comprising:
- a first resonator structure, the first resonator structure having a resonant frequency ω1, and a characteristic size L1;
- a second resonator structure, the second resonator structure having a resonant frequency ω2, and a characteristic size L2, wherein the first and second resonator structures are magnetically decoupled such that an effective magnetic coupling coefficient κeff between the first and second resonator structures is about zero;
- and
- a power combining circuit coupled to the magnetically decoupled first and second resonator structures arranged to:
- load match the first and second resonator structures and the device,
- load balance power from the first and second resonator structures, and
- maintain an effective magnetic coupling coefficient between the first and second resonator structures at about zero regardless of a spatial orientation of the wireless power unit with regards to the NFMR magnetic field such that the device wirelessly receives the at least the minimum amount of power from the wireless power unit regardless of an orientation of the at least two NFMR power receivers with respect to the NFMR magnetic field.
A peripheral device arranged to wirelessly receive power from a NFMR power transmitter independent of the orientation of the peripheral device with respect to the NFMR power transmitter, comprising:
- a wireless power receiving unit comprising:
- at least two magnetically de-coupled near field magnetic resonance (NFMR) power receivers each arranged to receive power from a NFMR magnetic field;
- a power combining circuit coupled to the at least two magnetically decoupled NFMR power receivers arranged to:
- load match the at least two NFMR power receivers and the device,
- load balance power from the at least two NFMR power receivers, and
- maintain an effective magnetic coupling coefficient between the at least two magnetically de-coupled NFMR power receivers at about zero regardless of a spatial orientation of the wireless power unit with regards to the NFMR magnetic field such that the device wirelessly receives the substantial constant power from the wireless power unit regardless of an orientation of the at least two NFMR power receivers with respect to the NFMR magnetic field.
Dependencies are inferred from the claim text.