Wireless charging system
First Claim
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1. A wireless charging system comprising:
- an inductive power supply for supplying wireless power from a primary; and
a remote device separable from said inductive power supply, wherein said remote device includes a secondary power circuit, a charge storage capacitor, a charging subcircuit, and a battery;
said secondary power circuit is electrically connected to said charge storage capacitor and said secondary power circuit is configured to receive wireless power from said primary of said inductive power supply and rapidly charge said charge storage capacitor;
sense circuitry coupled to said charge storage capacitor, said sense circuitry configured to provide a sensor output indicative of a sensed characteristic of said charge storage capacitor;
said charging subcircuit is electrically connected to said charge storage capacitor and said battery;
wherein, in response to said sensed characteristic of charge storage capacitor reaching a predetermined threshold, said charging subcircuit charges said battery with power stored in said charge storage capacitor, wherein said secondary power circuit controls supply of wirelessly received power to said charge storage capacitor based on said sensor output.
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Abstract
The present invention provides wireless power supply systems that wirelessly supply power to a remote device for rapidly charging a charge storage capacitor, which charges a battery with the power stored in the charge storage capacitor. This allows the remote device to be positioned near the inductive power supply for rapid charging of the charge storage capacitor and allows battery charging to continue even after the remote device is removed from the inductive power supply.
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Citations
24 Claims
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1. A wireless charging system comprising:
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an inductive power supply for supplying wireless power from a primary; and a remote device separable from said inductive power supply, wherein said remote device includes a secondary power circuit, a charge storage capacitor, a charging subcircuit, and a battery; said secondary power circuit is electrically connected to said charge storage capacitor and said secondary power circuit is configured to receive wireless power from said primary of said inductive power supply and rapidly charge said charge storage capacitor; sense circuitry coupled to said charge storage capacitor, said sense circuitry configured to provide a sensor output indicative of a sensed characteristic of said charge storage capacitor; said charging subcircuit is electrically connected to said charge storage capacitor and said battery; wherein, in response to said sensed characteristic of charge storage capacitor reaching a predetermined threshold, said charging subcircuit charges said battery with power stored in said charge storage capacitor, wherein said secondary power circuit controls supply of wirelessly received power to said charge storage capacitor based on said sensor output. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A remote device for receiving wireless power from an inductive power supply, the inductive power supplying having a primary for transmitting wireless power, said remote device comprising:
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a secondary power circuit configured to receive wireless power from the primary of the inductive power supply; a charge storage capacitor electrically connected to said secondary power circuit, wherein said secondary power circuit is configured to rapidly charge said charge storage capacitor; a battery; and sense circuitry coupled to said charge storage capacitor, said sense circuitry configured to provide a sensor output indicative of a sensed characteristic of said charge storage capacitor; a charging subcircuit electrically connected to said charge storage capacitor and said battery, wherein said charging subcircuit is configured to charge said battery with power stored in said charge storage capacitor; wherein said charging subcircuit charges said battery with power stored in said charge storage capacitor in response to said sensed characteristic of said charge storage capacitor reaching a predetermined threshold; and wherein said secondary power circuit controls supply of wirelessly received power to said charge storage capacitor based on said sensor output. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of wirelessly powering device circuitry of a remote device, said method comprising:
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generating an electromagnetic field with a primary of an inductive power supply; positioning a remote device with a secondary power circuit in the electromagnetic field generated by the primary to induce electrical power within the secondary power circuit; rapidly charging a charge storage capacitor in the secondary power circuit with the induced power; sensing a characteristic of the charge storage capacitor; in response to the sensed characteristic of the charge storage capacitor reaching a predetermined threshold, providing power to the device circuitry of the remote device with the power stored in the charge storage capacitor; and controlling supply of power received from the primary to the charge storage capacitor based on the sensed characteristic. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A remote device for receiving wireless power from an inductive power supply, the inductive power supply having a primary for transmitting wireless power, said remote device comprising:
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a secondary power circuit configured to receive wireless power from the primary of the inductive power supply; a charge storage capacitor electrically connected to said secondary power circuit, wherein said secondary power circuit is configured to rapidly charge said charge storage capacitor; sense circuitry coupled to said charge storage capacitor, said sense circuitry configured to provide a sensor output indicative of a sensed characteristic of said charge storage capacitor; device circuitry configured to be selectively coupled to said charge storage capacitor; switching circuitry electrically connected to said charge storage capacitor and said device circuitry, wherein said switching circuitry is configured to selectively couple said charge storage capacitor to said device circuitry such that power stored in said charge storage capacitor is transferred to said device circuitry; wherein said switching circuitry couples said charge storage capacitor to said device circuitry in response to said sensed characteristic of said charge storage capacitor reaching a predetermined threshold; and wherein said secondary power circuit controls supply of wirelessly received power to said charge storage capacitor based on said sensor output. - View Dependent Claims (22, 23, 24)
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Specification