Adjusting filter in a coupled coil system
First Claim
1. A coupled coil system for wireless power transfer between a transmitter and a receiver, comprising:
- a receiver coil in the receiver;
a load in the receiver operatively connected to the receiver coil; and
an adjusting filter in the receiver operatively connected between the receiver coil and the load, wherein the adjusting filter changes a signal received from the receiver coil to adjust an effective resistance or impedance of the load, the adjusting filter comprising;
a first variable capacitor in series with the receiver coil; and
a second variable capacitor connected parallel to the receiver coil.
1 Assignment
0 Petitions
Accused Products
Abstract
A receiver device in a coupled coil system for wireless energy transfer includes a receiver coil and a load device operatively connected to the receiver coil and configured to receive a signal from the receiver coil. As one example, the load device is a rechargeable battery. An adjusting filter is included in the receiver device and is operatively connected between the receiver coil and the load device. The adjusting filter can be used to transform the effective resistance or impedance of the load as presented to the transformer during energy transfer so that the effective resistant or impedance of the load is maintained at a substantially constant level, and the signal received by the load device is maintained at a substantially constant level.
113 Citations
19 Claims
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1. A coupled coil system for wireless power transfer between a transmitter and a receiver, comprising:
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a receiver coil in the receiver; a load in the receiver operatively connected to the receiver coil; and an adjusting filter in the receiver operatively connected between the receiver coil and the load, wherein the adjusting filter changes a signal received from the receiver coil to adjust an effective resistance or impedance of the load, the adjusting filter comprising; a first variable capacitor in series with the receiver coil; and a second variable capacitor connected parallel to the receiver coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for wirelessly transferring power from a transmitter coil in a transmitter to a receiver coil in a receiver, the method comprising:
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determining one or more operating parameters of a load included in the receiver; determining a frequency of a signal applied to the transmitter coil in the transmitter; and setting a capacitance value for at least one variable capacitor in a programmable adjusting filter parallel to the receiver coil based on the one or more operating parameters of the load and the frequency of the signal. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for wirelessly transferring power from a transmitter coil in a transmitter to a receiver coil in a receiver, the method comprising:
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transferring power to the receiver coil by applying a signal to the transmitter coil when a load operatively connected to the receiver coil is in an operating mode; adjusting a signal received from the receiver coil by modifying a capacitance parallel to the receiver coil; inputting the adjusted signal into the load; and shifting a frequency of the signal applied to the transmitter coil based on a change in the operating mode of the load. - View Dependent Claims (16, 17, 18, 19)
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Specification