Coil configurations for inductive power transfer
First Claim
1. A inductive power supply system comprising:
- a primary unit for transmitting wireless power, said primary unit including;
a primary circuit having a primary for producing a first field; and
a receiving unit separable from said primary unit and for receiving said wireless power from said primary unit, said receiving unit including;
two or more secondary resonating circuits configured to receive said wireless power over a range of distances from said primary unit, wherein each of said two or more secondary resonating circuits is configured to receive said wireless power at different distances between said primary unit and said receiving unit;
wherein one of said two or more secondary resonating circuits is configured for efficient energy transfer over a first portion of said range of distances and another of said two or more secondary resonating circuits is configured for efficient energy transfer over a second portion of said range of distances, wherein said first portion of said range of distances is different from said second portion of said range of distances;
a secondary circuit for receiving said wireless power by inductively coupling with at least one of (i) said primary circuit and (ii) one of said two or more secondary resonating circuits; and
wherein said two or more secondary resonating circuits are configured to inductively couple with said secondary circuit to transfer received wireless power to said secondary circuit.
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Accused Products
Abstract
An inductive power supply system in which the receiving unit includes a secondary coil and a plurality of resonating circuits with different characteristics. Each of the resonating circuits may include a resonating coil and a resonating capacitor. The resonating coils may be inductively coupled to the secondary coil so that energy may be transferred from one or more of the resonating coils to said receiving unit. The plurality of resonating circuits are configured to provide improved power transfer efficiency or performance at different distances between the primary coil and secondary coil. The present invention may also provide a method for tuning the wireless power system including the general steps of measuring an operating characteristic in the primary unit, measuring an operating characteristic in the receiver unit and tuning one or more of the components in the primary unit and the secondary unit based on a comparison of the two measurements.
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Citations
16 Claims
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1. A inductive power supply system comprising:
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a primary unit for transmitting wireless power, said primary unit including; a primary circuit having a primary for producing a first field; and a receiving unit separable from said primary unit and for receiving said wireless power from said primary unit, said receiving unit including; two or more secondary resonating circuits configured to receive said wireless power over a range of distances from said primary unit, wherein each of said two or more secondary resonating circuits is configured to receive said wireless power at different distances between said primary unit and said receiving unit; wherein one of said two or more secondary resonating circuits is configured for efficient energy transfer over a first portion of said range of distances and another of said two or more secondary resonating circuits is configured for efficient energy transfer over a second portion of said range of distances, wherein said first portion of said range of distances is different from said second portion of said range of distances; a secondary circuit for receiving said wireless power by inductively coupling with at least one of (i) said primary circuit and (ii) one of said two or more secondary resonating circuits; and wherein said two or more secondary resonating circuits are configured to inductively couple with said secondary circuit to transfer received wireless power to said secondary circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A remote device for receiving power from an inductive power supply, said remote device comprising:
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two or more resonating circuits configured to inductively couple with said inductive power supply, each of said two or more resonating circuits receives power efficiently over a range of different distances between said remote device and said inductive power supply; and a secondary circuit configured for inductively coupling with at least one of said two or more resonating circuits and said inductive power supply for receiving power wirelessly, said secondary circuit receives power efficiently at a distance less than said range of different distances at which each of said two or more resonating circuits receive power efficiently; wherein one of said two or more secondary resonating circuits is configured for efficient energy transfer at a first distance portion of said range and another of said two or more secondary resonating circuits configured for efficient energy transfer at a second distance portion of said range, wherein said first distance portion is different from said second distance portion; and wherein said two or more secondary resonating circuits are configured to inductively coupled with said secondary circuit to transfer received wireless power to said secondary circuit. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification