Power recovery by an electromagnetic transponder
First Claim
Patent Images
1. A method, comprising:
- recovering power from a field of a terminal using an electromagnetic transponder, the recovering including;
evaluating a ratio of a current coupling factor of the transponder to a position of optimum coupling with a value of a resistive load; and
detuning an oscillating circuit if the ratio is greater than a first threshold greater than or equal to one.
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Abstract
A method of power recovery by an electromagnetic transponder in the field of a terminal, wherein: a ratio of the current coupling factor of the transponder with the terminal to an optimum coupling position with a resistive load value is evaluated; and a detuning of the oscillating circuit is caused if the ratio is greater than a first threshold greater than or equal to one.
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Citations
27 Claims
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1. A method, comprising:
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recovering power from a field of a terminal using an electromagnetic transponder, the recovering including; evaluating a ratio of a current coupling factor of the transponder to a position of optimum coupling with a value of a resistive load; and detuning an oscillating circuit if the ratio is greater than a first threshold greater than or equal to one. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electromagnetic transponder comprising:
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an oscillating circuit; a rectifying circuit downstream of the oscillating circuit and capable of providing a D.C. voltage when the transponder is in a magnetic field of a terminal; and at least one processing unit programmed to implement a method that includes; recovering power from the magnetic field of the terminal, the recovering including; evaluating a ratio of a current coupling factor of the transponder to a position of optimum coupling with a value of a resistive load; and detuning an oscillating circuit if the ratio is greater than a first threshold greater than or equal to one. - View Dependent Claims (10, 11)
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12. A method for recovering power in an electromagnetic transponder, comprising:
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evaluating, by a controller of the transponder, a ratio of a current coupling factor, with respect to a terminal, of the transponder to an optimum coupling factor of the transponder; detuning, by the controller, an oscillating circuit of the transponder if the ratio is greater than a first quantity; and decreasing, by the controller, a power consumption of at least one transponder circuit and/or requesting the terminal to increase transmitted power if the ratio is less than a second quantity. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. An electromagnetic transponder comprising:
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an oscillating circuit; a rectifying circuit configured to provide a DC voltage when the oscillating circuit is in a magnetic field of a terminal; and a processing unit configured to; evaluate a ratio of a current coupling factor, with respect to the terminal, of the transponder to an optimum coupling factor of the transponder; detune the oscillating circuit of the transponder if the ratio is greater than a first quantity; and decrease a power consumption of at least one transponder circuit and/or request the terminal to increase transmitted power if the ratio is less than a second quantity. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification