Efficiency non-self tuning wireless power transfer systems
First Claim
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1. A wireless power transfer primary resonant network including:
- a primary winding capable of being energised to provide a magnetic field; and
at least one reactive tuning component selected to constrain a reactive loading on a power supply which energises the primary resonant network, the reactive tuning component being selected dependent on a given variation in inductance or capacitance of the primary resonant network and a given variation in inductance or capacitance of a secondary resonant network to be coupled to the primary resonant network, and wherein an input impedance to the primary resonant network is inductive.
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Abstract
A primary resonant network for a wireless power transfer has a primary winding capable of being energized to provide a magnetic field, and a reactive component selected to constrain the reactive loading on a power supply which energizes the primary resonant network. The reactive component is selected dependent on a given variation in inductance or capacitance of the primary resonant network and a given variation in inductance or capacitance of a secondary resonant network coupled to the primary resonant network.
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Citations
19 Claims
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1. A wireless power transfer primary resonant network including:
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a primary winding capable of being energised to provide a magnetic field; and at least one reactive tuning component selected to constrain a reactive loading on a power supply which energises the primary resonant network, the reactive tuning component being selected dependent on a given variation in inductance or capacitance of the primary resonant network and a given variation in inductance or capacitance of a secondary resonant network to be coupled to the primary resonant network, and wherein an input impedance to the primary resonant network is inductive. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless power transfer secondary resonant network including:
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a pick-up winding capable of receiving energy from a varying magnetic field produced by a primary resonant network; and at least one reactive tuning component selected to constrain a reactive loading on a power supply which energises the primary resonant network, the reactive tuning component being selected dependent on a given variation in inductance or capacitance of the secondary resonant network and a given variation in inductance or capacitance of the primary resonant network to which the secondary resonant network is to be coupled, and wherein an input impedance to the primary resonant network is inductive. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus for wireless power transfer including:
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a primary resonant network, and a secondary resonant network coupled to the primary resonant network, wherein the apparatus has a system operating frequency and one or both of the primary resonant network and the secondary resonant network have a natural resonant frequency that is different from the system operating frequency, and wherein the natural resonant frequency of the primary resonant network is selected dependent on a given variation in inductance or capacitance of the primary resonant network and a given variation in inductance or capacitance of the secondary resonant network, and wherein the input impedance to the primary resonant network is inductive. - View Dependent Claims (16, 17, 18)
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19. A method of designing a wireless power transfer primary resonant network having a primary winding capable of being energised to provide a magnetic field, the method comprising:
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selecting at least one reactive tuning component selected to constrain the reactive loading on a power supply which energises the primary resonant network, the reactive tuning component being selected dependent on a given variation in inductance or capacitance of the primary resonant network and a given variation in inductance or capacitance of a secondary resonant network to be coupled to the primary resonant network, wherein the input impedance to the primary resonant network is inductive.
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Specification