Power management in an electromagnetic transponder
First Claim
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1. A method for managing power in an electromagnetic transponder in a field of a terminal, comprising the steps of:
- evaluating a power consumption of a transponder circuit of the transponder;
determining whether the power consumption is below a threshold;
evaluating a current coupling factor between the transponder and the terminal in response to determining that the power consumption is below the threshold;
causing an increase of the transponder power consumption based on evaluating the current coupling factor; and
causing a detuning of an oscillating circuit of the transponder based on evaluating the current coupling factor.
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Abstract
A method for managing the power in an electromagnetic transponder in the field of a terminal, including the steps of: evaluating the power consumption of the transponder circuits; and if this power consumption is below a threshold, evaluating the current coupling factor between the transponder and the terminal and, according to the current coupling: causing an increase of the transponder power consumption or causing a detuning of an oscillating circuit of the transponder.
63 Citations
28 Claims
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1. A method for managing power in an electromagnetic transponder in a field of a terminal, comprising the steps of:
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evaluating a power consumption of a transponder circuit of the transponder; determining whether the power consumption is below a threshold; evaluating a current coupling factor between the transponder and the terminal in response to determining that the power consumption is below the threshold; causing an increase of the transponder power consumption based on evaluating the current coupling factor; and causing a detuning of an oscillating circuit of the transponder based on evaluating the current coupling factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling power in an electromagnetic transponder, comprising:
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evaluating, by a controller of the transponder, a power consumption of circuits of the transponder; determining whether the power consumption is below a threshold; determining, by the controller whether a current coupling factor between the transponder and a terminal is within a prescribed range, in response to determining that the power consumption is below the threshold; increasing, by the controller, the power consumption in response to determining that the current coupling factor is outside the prescribed range; and detuning, by the controller, an oscillating circuit of the transponder in response to determining that the current coupling factor is within the prescribed range. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. 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 power consumption of circuits of the transponder; determine whether the power consumption is below a threshold; determine, in response to determining that the power consumption is below the threshold, whether a current coupling factor between the transponder and the terminal is within a prescribed range; increase the power consumption in response to determining that the current coupling factor is outside the prescribed range; and detune an oscillating circuit of the transponder in response to determining that the current coupling factor is within the prescribed range. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification