Multiple resonant cells for wireless power mats
First Claim
1. Method of targeting the magnetic field of an inductive charging pad to a nearby receiver, by providing multiple windings and an AC input (Vac) having a frequency of operation, characterized by constructing a resonant cell (Cell1, Cell2, Cell3) by adding a capacitor to each of said windings, wherein the magnetic field of a particular resonant cell (Cell1, Cell2, Cell3) is passively increased by moving a resonance point of said resonant cell when bringing a secondary winding of a receiver in proximity to said resonant cell (Cell1, Cell2, Cell3), including the step of arranging the capacitor and the winding of each resonant cell (Cell1, Cell2, Cell3) in series.
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Accused Products
Abstract
A method of configuring windings in an inductive charging pad array by using capacitors for impedance control and configuring windings to reduce the stray magnetic fields produced.
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Citations
17 Claims
- 1. Method of targeting the magnetic field of an inductive charging pad to a nearby receiver, by providing multiple windings and an AC input (Vac) having a frequency of operation, characterized by constructing a resonant cell (Cell1, Cell2, Cell3) by adding a capacitor to each of said windings, wherein the magnetic field of a particular resonant cell (Cell1, Cell2, Cell3) is passively increased by moving a resonance point of said resonant cell when bringing a secondary winding of a receiver in proximity to said resonant cell (Cell1, Cell2, Cell3), including the step of arranging the capacitor and the winding of each resonant cell (Cell1, Cell2, Cell3) in series.
- 6. Method of targeting the magnetic field of an inductive charging pad to a nearby receiver, by providing multiple windings and an AC input (Vac) having a frequency of operation, characterized by constructing a resonant cell (Cell1, Cell2, Cell3) by adding a capacitor to each of said windings, wherein the magnetic field of a particular resonant cell (Cell1, Cell2, Cell3) is passively increased by moving a resonance point of said resonant cell when bringing a secondary winding of a receiver in proximity to said resonant cell (Cell1, Cell2, Cell3), including the step of arranging the resonant cells (Cell1, Cell2, Cell3) in series, wherein a voltage across a resonant cell (Cell1, Cell2, Cell3) is increased when bringing the secondary winding of the receiver in proximity to said resonant cell (Cell1, Cell2, Cell3).
- 10. Inductive charging pad for targeting a magnetic field of the charging pad to a receiver, said inductive charging pad comprising multiple resonant cells (Cell1, Cell2, Cell3) and an AC input for connecting an AC voltage (Vac) having a frequency of operation, each resonant cell (Cell1, Cell2, Cell3) including a winding and a capacitor being connected either in parallel or in series, whereby the multiple resonant cells (Cell1, Cell2, Cell3) are arranged in series across the AC input and wherein a particular cell is adapted to passively increase its magnetic field by moving its resonance point when a secondary winding of the receiver is brought in proximity of said specific resonant cell (Cell1, Cell2, Cell3).
Specification