System and method for frequency prediction
First Claim
1. An apparatus for wirelessly receiving power from a transmitter circuit configured to generate a magnetic field in response to a driving current at an operating frequency, the apparatus comprising:
- a receiver circuit configured to receive power via the magnetic field, wherein the transmitter circuit and the receiver circuit are separated by an offset distance; and
a controller circuit operationally coupled to the receiver circuit and configured to;
measure a current or voltage value associated with the receiver circuit in response to a sense current driving the transmitter circuit at the operating frequency,determine the offset distance between the transmitter circuit and the receiver circuit based at least in part on (a) the measured current value or the measured voltage value and (b) a maximum current value available for driving the transmitter circuit,determine a level of coupling between the transmitter circuit and the receiver circuit based on a comparison of the sense current to the maximum current value, anddetermine an updated operating frequency of the current driving the transmitter circuit based on the determined offset distance and at least one known inductance variation parameter of the receiver circuit.
2 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods for setting an operating frequency for wireless charging systems. The wireless charging system comprises a transmitter circuit configured to generate a magnetic field in response to a current having an operating frequency and driving the transmitter circuit, and a receiver circuit configured to receive power via the magnetic field. The transmitter circuit and the receiver circuit are separated by an offset distance that contributes to a level of detuning between the transmitter and receiver circuits. To reduce a level of detuning, a level of coupling between the transmitter and receiver circuits is determined based upon a measured current or voltage value associated with the receiver circuit. From the determined level of coupling, the offset distance can be estimated. The offset distance may be used to determine a desired operating frequency for reducing the level of detuning between the transmitter circuit and the receiver circuit.
7 Citations
28 Claims
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1. An apparatus for wirelessly receiving power from a transmitter circuit configured to generate a magnetic field in response to a driving current at an operating frequency, the apparatus comprising:
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a receiver circuit configured to receive power via the magnetic field, wherein the transmitter circuit and the receiver circuit are separated by an offset distance; and a controller circuit operationally coupled to the receiver circuit and configured to; measure a current or voltage value associated with the receiver circuit in response to a sense current driving the transmitter circuit at the operating frequency, determine the offset distance between the transmitter circuit and the receiver circuit based at least in part on (a) the measured current value or the measured voltage value and (b) a maximum current value available for driving the transmitter circuit, determine a level of coupling between the transmitter circuit and the receiver circuit based on a comparison of the sense current to the maximum current value, and determine an updated operating frequency of the current driving the transmitter circuit based on the determined offset distance and at least one known inductance variation parameter of the receiver circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for setting an operating frequency in a wireless charging system, the wireless charging system comprising a transmitter circuit configured to generate a magnetic field in response to a driving current at an operating frequency, and a receiver circuit configured to receive power via the magnetic field, wherein the transmitter circuit and the receiver circuit are separated by an offset distance that contributes to a level of detuning between the transmitter and receiver circuits, the method comprising:
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measuring a current or voltage value associated with the receiver circuit in response to a sense current driving the transmitter circuit at the operating frequency; determining the offset distance between the transmitter circuit and the receiver circuit based at least in part on (a) the measured current value or the measured voltage value and (b) a maximum current available for driving the transmit circuit; determining a level of coupling between the transmitter circuit and the receiver circuit based on a comparison of the sense current to the maximum current value; and determining an updated operating frequency of the current driving the transmitter circuit based on the determined offset distance and at least one known inductance variation parameter of the receiver circuit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus for wirelessly receiving power from a transmitter means configured to generate a magnetic field in response to a driving current at an operating frequency, the apparatus comprising:
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means for receiving wireless power via the magnetic field, wherein the transmitter means and the receiving means are separated by an offset distance that contributes to a level of detuning between the transmitter and receiving means; means for measuring a current or voltage value associated with the receiving means in response to a sense current driving the transmitter circuit at the operating frequency; means for determining the offset distance between the transmitter circuit and the receiving means based at least in part on (a) the measured current value or the measured voltage value and (b) a maximum current value available for driving the transmit circuit; means for determining a level of coupling between the transmitter means and the receiving means based on a comparison of the sense current to the maximum current value; and means for determining an updated operating frequency of the current driving the transmitter circuit based on the determined offset distance and at least one known inductance variation parameter of the receiving means. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification