Method for managing contactless power transfer from a transmitter to a receiver, and corresponding transmitter
First Claim
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1. A method for managing contactless power transfer from a transmitter to a receiver that are coupled to one another, comprising:
- generating a magnetic field by the transmitter from a command at a control frequency for a switching resonant circuit,controlling the switching resonant circuit with a control signal that is internal to an oscillating loop that maintains itself at said control frequency and incorporates said switching resonant circuit,generating the control signal as a delayed signal resulting from detection of the changes of slope of a signal that is internal to the switching resonant circuit,communicating information by the receiver involving modulation of said magnetic field,detecting said modulation by the transmitter so as to extract said information by detecting variations in the control frequency; and
adjusting said control frequency according to said received information.
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Abstract
Contactless power transfer from a transmitter to a receiver is managed. A magnetic field is generated by the transmitter from a command at a control frequency for a switching resonant circuit. The receiver communicates information to the transmitter through modulation of the magnetic field. The modulation is detected by the transmitter so as to extract the information. An adjustment of the control frequency is then made according to the received information. The modulation detection involves detecting variations in the control frequency.
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Citations
30 Claims
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1. A method for managing contactless power transfer from a transmitter to a receiver that are coupled to one another, comprising:
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generating a magnetic field by the transmitter from a command at a control frequency for a switching resonant circuit, controlling the switching resonant circuit with a control signal that is internal to an oscillating loop that maintains itself at said control frequency and incorporates said switching resonant circuit, generating the control signal as a delayed signal resulting from detection of the changes of slope of a signal that is internal to the switching resonant circuit, communicating information by the receiver involving modulation of said magnetic field, detecting said modulation by the transmitter so as to extract said information by detecting variations in the control frequency; and adjusting said control frequency according to said received information. - View Dependent Claims (2, 3, 4)
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5. A transmitter, comprising:
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a switching resonant circuit configured to be coupled to an antenna of a receiver for contactless power transfer to the receiver, a circuit configured to manage said contactless power transfer comprising; a generator circuit configured to generate a magnetic field from a command at a control frequency for the switching resonant circuit, wherein the generator circuit comprises; an oscillating loop that maintains itself at said control frequency and incorporates said switching resonant circuit, a slope detection module configured to detect changes of slope of a signal that is internal to the resonant circuit and to deliver an intermediate signal, and an adjustable delay circuit connected to the output of the slope detection module in order to delay the intermediate signal and to deliver a control signal for the switching resonant circuit, a detector circuit configured to detect modulation of the magnetic field that is representative of information communicated by the receiver for the purpose of extracting said information, and a processing circuit configured to adjust said control frequency according to said received information, wherein the detector circuit is further configured to detect variations in the control frequency. - View Dependent Claims (6, 7, 8)
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9. A transmitter, comprising:
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a switching resonant circuit generating an oscillating signal in response to a control signal to produce a magnetic field; a slope detection module configured to detect changes of slope of the oscillating signal, a delay circuit receiving an output of the slope detection module and implementing a variable delay to control power transmission to a receiver; wherein a change a frequency of the control signal is indicative of modulation of said magnetic field by the receiver; and a circuit configured to determine a period of the control signal, compare the determined period to a target period, and adjust the variable delay implemented by the delay circuit in response to a difference between the determined period and the target period. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method, comprising:
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generating an oscillating signal in response to a control signal to produce a magnetic field from a switching resonant circuit; detecting changes of slope of the oscillating signal; generating the control signal from the detected changes of slope with a variable delay to control power transmission to a receiver; wherein a change a frequency of the control signal is indicative of modulation of said magnetic field by the receiver; determining a period of the control signal; comparing the determined period to a target period; and adjusting the variable delay in response to a difference between the determined period and the target period. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method for managing contactless power transfer from a transmitter to a receiver that are coupled to one another, comprising:
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generating a magnetic field by the transmitter from a command at a control frequency for a switching resonant circuit, controlling the switching resonant circuit with a control signal that is internal to an oscillating loop that maintains itself at said control frequency and incorporates said switching resonant circuit, and generating the control signal as a delayed signal resulting from detection of the changes of slope of a signal that is internal to the switching resonant circuit. - View Dependent Claims (22, 23, 24)
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25. A transmitter, comprising:
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a switching resonant circuit configured to be coupled to an antenna of a receiver for contactless power transfer to the receiver, and a circuit configured to manage said contactless power transfer comprising; a generator circuit configured to generate a magnetic field from a command at a control frequency for the switching resonant circuit, wherein the generator circuit comprises; an oscillating loop that maintains itself at said control frequency and incorporates said switching resonant circuit, a slope detection module configured to detect changes of slope of a signal that is internal to the resonant circuit and to deliver an intermediate signal, and an adjustable delay circuit connected to the output of the slope detection module in order to delay the intermediate signal and to deliver a control signal for the switching resonant circuit. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification