Efficient and robust wireless energy transfer
First Claim
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1. A method of transferring energy between a source coil and a drain coil, comprising:
- setting an initial resonant frequency of said source coil as a first condition;
setting said source coil and said drain coil in positions relative to each other to define an initial coupling coefficient therebetween, said initial coupling coefficient defining a second condition; and
adiabatically changing at least one member of the group consisting of a value of said first condition and a value of said second condition while pumping energy into said source coil, thereby to transfer said pumped energy to said drain coil; and
varying said resonant frequency of said source coil by an amount of up to ten percent over a period of between one and three milliseconds.
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Abstract
A method or apparatus for wireless transferring energy between a source coil and a drain coil, comprises selling an initial resonant frequency of the source coil as a first condition; setting the source coil and said drain coil in positions relative to each other to define an initial coupling coefficient therebetween, so that the initial coupling coefficient comprises a second condition; and adiabatically changing one or both of the conditions while pumping energy into the source coil. The source coil energy is transferred to the drain coil over the course of the adiabatic change.
4 Citations
24 Claims
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1. A method of transferring energy between a source coil and a drain coil, comprising:
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setting an initial resonant frequency of said source coil as a first condition; setting said source coil and said drain coil in positions relative to each other to define an initial coupling coefficient therebetween, said initial coupling coefficient defining a second condition; and adiabatically changing at least one member of the group consisting of a value of said first condition and a value of said second condition while pumping energy into said source coil, thereby to transfer said pumped energy to said drain coil; and varying said resonant frequency of said source coil by an amount of up to ten percent over a period of between one and three milliseconds. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of transferring energy between a source coil and a drain coil, comprising:
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setting an initial resonant frequency of said source coil as a first condition; setting said source coil and said drain coil in positions relative to each other to define an initial coupling coefficient therebetween, said initial coupling coefficient defining a second condition; and adiabatically changing at least one member of the group consisting of a value of said first condition and a value of said second condition while pumping energy into said source coil, thereby to transfer said pumped energy to said drain coil; wherein both of said first condition and said second condition are adiabatically changed, and wherein at any given time of said adiabatic changing there is a detuning value, said detuning value being the difference between a current value of the resonant frequency of the source coil and the resonant frequency of the drain coil, said adiabatic changing providing a smooth time dependence of the coupling coefficient (κ
(t)) and the detuning value (Δ
(t). - View Dependent Claims (8, 9)
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10. A method of transferring energy between a source coil and a drain coil, comprising:
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setting an initial resonant frequency of said source coil as a first condition; setting said source coil and said drain coil in positions relative to each other to define an initial coupling coefficient therebetween, said initial coupling coefficient defining a second condition; and adiabatically changing at least one member of the group consisting of a value of said first condition and a value of said second condition while pumping energy into said source coil, thereby to transfer said pumped energy to said drain coil;
the method further comprising varying the resonant frequency of the source coil such that a detuning value (Δ
(t)), said detuning value being a difference between the resonant frequency of the source coil and the resonant frequency of the drain coil, sweeps slowly from a negative value, said negative value being larger than the coupling between said source coil and said drain coil, to a positive value being larger than said coupling between said source coil and said drain coil.
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11. A method of transferring energy between a source coil and a drain coil, comprising:
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setting an initial resonant frequency of said source coil as a first condition; setting said source coil and said drain coil in positions relative toe ach other to define an initial coupling coefficient therebetween, said initial coupling coefficient defining a second condition; and adiabatically changing at least one member of the group consisting of a value of said first condition and a value of said second condition while pumping energy into said source coil, thereby to transfer said pumped energy to said drain coil;
the method further comprising modifying said changing to reduce an amount of time that energy is retained in said source coil.
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12. A method of transferring energy between a source coil and a drain coil, comprising:
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setting an initial resonant frequency of said source coil as a first condition; setting said source coil and said drain coil in positions relative toe ach other to define an initial coupling coefficient therebetween, said initial coupling coefficient defining a second condition; and adiabatically changing at least one member of the group consisting of a value of said first condition and a value of said second condition while pumping energy into said source coil, thereby to transfer said pumped energy to said drain coil;
the method further comprising varying said resonant frequency of said source coil by an amount of up to ten percent over a period exceeding two milliseconds. - View Dependent Claims (13)
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14. Apparatus for transferring energy comprising:
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a source coil having resonance variation circuitry for varying a resonant frequency of said source coil; a position unit for varying a position or orientation of said source coil so as to vary a coupling coefficient of said source coil with a respective drain coil to which said source coil is wirelessly coupled; and a controller configured to adiabatically vary at least one of said resonant frequency and said coupling coefficient while pumping energy into said source coil, thereby to transfer said pumped energy to said drain coil wherein said controller is configured to vary the resonant frequency of the source coil such that a detuning value (Δ
(t)), said detuning value being a difference between the resonant frequency of the source coil and the resonant frequency of the drain coil, sweeps slowly from a negative value, said negative value being larger than the coupling between said source coil and said drain coil, to a positive value being larger than said coupling between said source coil and said drain coil. - View Dependent Claims (15, 16, 17, 18, 21, 22, 23, 24)
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19. Apparatus for transferring energy comprising:
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a source coil having resonance variation circuitry for varying a resonant frequency of said source coil; a position unit for varying a position or orientation of said source coil so as to vary a coupling coefficient of said source coil with a respective drain coil to which said source coil is wirelessly coupled; and a controller configured to adiabatically vary at least one of said resonant frequency and said coupling coefficient while pumping energy into said source coil, thereby to transfer said pumped energy to said drain coil, wherein at any given time of said adiabatic changing there is a detuning value, said detuning value being the difference between a current value of the resonant frequency of the source coil and the resonant frequency of the drain coil, said adiabatic changing providing a smooth time dependence of the coupling coefficient (κ
(t)) and the detuning value (Δ
(t). - View Dependent Claims (20)
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Specification