Electromagnetic transponder with no autonomous power supply
First Claim
Patent Images
1. An electromagnetic transponder, comprising:
- an oscillating circuit that includes an antenna;
a first rectifying bridge having its A.C. input terminals connected across the oscillating circuit and having its rectified output terminals connected at least to a voltage regulator in charge of providing a supply voltage and further connected to a modulator; and
a second rectifying bridge, of dimension smaller than that of the first bridge, having its two A.C. input terminals connected across the oscillating circuit and having at least one output terminal connected to a demodulator of data sensed by the oscillating circuit.
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Abstract
An electromagnetic transponder comprising: an oscillating circuit; a first rectifying bridge having its A.C. input terminals connected across the oscillating circuit and having its rectified output terminals connected at least to a voltage regulator in charge of providing a supply voltage; and a second rectifying bridge, of dimension smaller than that of the first bridge, having its two A.C. input terminals connected across the oscillating circuit and having at least one output terminal connected to a demodulator of data sensed by the oscillating circuit.
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Citations
24 Claims
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1. An electromagnetic transponder, comprising:
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an oscillating circuit that includes an antenna; a first rectifying bridge having its A.C. input terminals connected across the oscillating circuit and having its rectified output terminals connected at least to a voltage regulator in charge of providing a supply voltage and further connected to a modulator; and a second rectifying bridge, of dimension smaller than that of the first bridge, having its two A.C. input terminals connected across the oscillating circuit and having at least one output terminal connected to a demodulator of data sensed by the oscillating circuit. - View Dependent Claims (2, 3, 4, 5)
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6. A method of supplying power to a transponder, comprising:
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receiving a wireless signal at the transponder; rectifying a received signal at a first rectifier to obtain a first rectified signal that is output to a regulator and receiving a modulated output signal from a modulator on an output terminal of the first rectifier; rectifying the received signal to obtain a second rectified signal; regulating the first rectified signal; and demodulating the second rectified signal. - View Dependent Claims (7, 8, 9)
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10. A system for powering a transponder, comprising:
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a means for receiving a wireless signal at the transponder; a first means for rectifying the received signal as a first rectified signal that is input to at least a regulator and to receive a modulator output on an output of the first means for rectifying; a second means for rectifying the received signal as a second rectified signal; a means for demodulating the second rectified signal as a demodulated signal; and a means for processing the demodulated signal. - View Dependent Claims (11, 12, 13, 14)
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15. A system for wireless communication, comprising:
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a terminal that includes an antenna to transmit a wireless signal; and a transponder electro-magnetically coupled to the terminal, the transponder including; a first rectifying bridge having at least one input terminal coupled to an oscillating circuit and having an output terminal coupled to a voltage regulator that is arranged to provide a supply voltage and further coupled to the output of a modulator; and a second rectifying bridge having at least one input terminal coupled to the oscillating circuit and having an output terminal coupled to a demodulator. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A transponder apparatus, comprising:
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an oscillating circuit that includes an antenna coupled to at least one input terminal of a first rectifying unit and at least one input terminal of a second rectifying unit that has a smaller current capacity than the first rectifying unit; a first filter coupled to an output terminal of the first rectifying unit and a input terminal of a voltage regulator arranged to provide a supply voltage; a second filter coupled to an output terminal of the second rectifying unit and coupled to an input terminal of a demodulator that has an output coupled to a processing unit; and a modulator that has at least one input terminal coupled the processing unit and an output terminal coupled to an output terminal of the first rectifying unit. - View Dependent Claims (23, 24)
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Specification