Wireless power transmission system
First Claim
1. Wireless power transmission system comprising:
- a base unit including;
multiple magnetic field generator circuits; and
a controller, configured to determine a transmission circuit from said generator circuits to transfer power to a device when a receiving inductor of said device is in proximity to said transmission circuit, whereupon the controller is configured to operate said transmission circuit to generate a first magnetic field, having a first phase, to induce a current in said receiving inductor; and
said controller is further configured to operate at least first and second ones of the remaining generator circuits as a compensation circuit to generate a second magnetic field, having an opposite phase to said first phase, wherein said controller is further configured to compensate a magnetic far-field of said first magnetic field by controlling a sum of magnetic fluxes generated in the second magnetic field to be substantially equal in magnitude and opposite in direction to a magnetic flux generated in the first magnetic field.
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Accused Products
Abstract
A Wireless power transmission system comprises a base unit (1) with multiple magnetic field generator circuits and a device (10), separable from said base unit (1) having a receiving inductor, adapted to receive power inductively when said device (10) is in proximity to one of said generator circuits, wherein said base unit (1) comprises a controller (3), configured to determine a transmission circuit (2′) from said generator circuits when said receiving inductor is in proximity to said transmission circuit (2′), whereupon said transmission circuit (2′) is operated to generate a first magnetic field (8), having a first phase, to induce a current in said receiving inductor and at least one of the remaining generator circuits is operated as a compensation circuit (2″, 52, 82) to generate a second magnetic field (21), having an opposite phase to said first phase.
85 Citations
12 Claims
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1. Wireless power transmission system comprising:
a base unit including; multiple magnetic field generator circuits; and a controller, configured to determine a transmission circuit from said generator circuits to transfer power to a device when a receiving inductor of said device is in proximity to said transmission circuit, whereupon the controller is configured to operate said transmission circuit to generate a first magnetic field, having a first phase, to induce a current in said receiving inductor; and said controller is further configured to operate at least first and second ones of the remaining generator circuits as a compensation circuit to generate a second magnetic field, having an opposite phase to said first phase, wherein said controller is further configured to compensate a magnetic far-field of said first magnetic field by controlling a sum of magnetic fluxes generated in the second magnetic field to be substantially equal in magnitude and opposite in direction to a magnetic flux generated in the first magnetic field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Method for operating a wireless power transmission system, comprising a base unit, having multiple magnetic field generator circuits, and a device, separable from said base unit having a receiving inductor, adapted to receive power inductively when said device is in proximity to one of said generator circuits, wherein the method comprises:
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determining the proximity of the receiving inductor to a transmission circuit of said generator circuits; determining a transmission circuit from said generator circuits to transfer power to a device when a receiving inductor of said device is in proximity to said transmission circuit; operating said transmission circuit to generate a first magnetic field, having a first phase, to induce a current in said receiving inductor; operating at least first and second ones of the remaining generator circuits as a compensation circuit to generate a second magnetic field, having an opposite phase to said first phase of said first magnetic field; and compensating a magnetic far-field of said first magnetic field by controlling a sum of magnetic fluxes generated in the second magnetic field to be substantially equal in magnitude and opposite in direction to a magnetic flux for the first magnetic field.
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12. A non-transitory computer-readable medium having one or more executable instructions stored thereon, which when executed by a processor cause the processor to perform a method for operating a wireless power transmission system, the system comprising a base unit having multiple magnetic field generator circuits, and a device, which is separable from said base unit and includes a receiving inductor that is adapted to receive power inductively when said device is in proximity to one of said generator circuits, the method comprising:
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determining the proximity of the receiving inductor to a transmission circuit of said generator circuits; determining a transmission circuit from said generator circuits to transfer power to a device when a receiving inductor of said device is in proximity to said transmission circuit; operating said transmission circuit to generate a first magnetic field, having a first phase, to induce a current in said receiving inductor; operating at least first and second ones of the remaining generator circuits as a compensation circuit to generate a second magnetic field, having an opposite phase to said first phase of said first magnetic field; and compensating a magnetic far-field of said first magnetic field by controlling a sum of magnetic fluxes generated in the second magnetic field to be substantially equal in magnitude and opposite in direction to a magnetic flux for the first magnetic field.
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Specification