Detection of coil coupling in an inductive charging system
First Claim
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1. A receiver device for use in an inductive charging system, comprising:
- a receiver coil operatively connected to an input of an AC-to-DC converter;
a rechargeable battery operatively connected to an output of the AC-to-DC converter;
a first resonant circuit operatively connected in series between the receiver coil and the input of the AC-to-DC converter, the first resonant circuit associated with a first resonant frequency;
a second resonant circuit operatively connected in series across leads of the first resonant circuit, the second resonant circuit associated with a second resonant frequency that is different from the first resonant frequency; and
a switch configured to;
connect the second resonant circuit across the leads of the first resonant circuit when rechargeable battery is fully charged; and
disconnect the second resonant circuit from the first resonant circuit when the receiver device is receiving power.
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Abstract
An inductive charging system can include a transmitter device and a receiver device. The transmitter device may be adapted to detect when a receiver coil in the receiver device is coupled to a transmitter coil in the transmitter device. For example, the current input into a DC-to-AC converter in the transmitter device can be measured and coil coupling detected when the current equals or exceeds a threshold value.
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Citations
20 Claims
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1. A receiver device for use in an inductive charging system, comprising:
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a receiver coil operatively connected to an input of an AC-to-DC converter; a rechargeable battery operatively connected to an output of the AC-to-DC converter; a first resonant circuit operatively connected in series between the receiver coil and the input of the AC-to-DC converter, the first resonant circuit associated with a first resonant frequency; a second resonant circuit operatively connected in series across leads of the first resonant circuit, the second resonant circuit associated with a second resonant frequency that is different from the first resonant frequency; and a switch configured to; connect the second resonant circuit across the leads of the first resonant circuit when rechargeable battery is fully charged; and disconnect the second resonant circuit from the first resonant circuit when the receiver device is receiving power. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A receiver device for use in an inductive charging system, comprising:
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a receiver coil operative to receive inductive power; a first resonant circuit operatively connected in series with the receiver coil and associated with a first resonant frequency; and a second resonant circuit coupling an output of the first resonant circuit to a lead of the receiver coil, the second resonant circuit associated with a second resonant frequency that is higher than the first resonant frequency; wherein; the second resonant circuit is associated with a high-power mode of a transmitter device coupled to the receiver device. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A receiver device for use in a wireless charging system, the receiver device comprising:
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a processor; a rechargeable battery in communication with the processor; an inductive coil in communication with the processor and the rechargeable battery; a first capacitor connected in series with a first lead of the inductive coil; a second capacitor coupling an output lead of the first capacitor to a second lead of the inductive coil; and a switch connected in series with the second capacitor and in communication with the processor; wherein the processor is configured to send a signal to the switch to connect the second capacitor to the inductive coil when the rechargeable battery is charged beyond a threshold. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification