Electromagnetic transponder with no autonomous power supply
AssigneeSTMicroelectronics S.r.l.
InventorJerome Conraux
Life of this patent
Estimating the term…
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.
Claims25
An electromagnetic transponder comprising an oscillating circuit, and comprising:
- 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.
A method of supplying power to a transponder, comprising:
- receiving a wireless signal at the transponder;
- rectifying a received signal to obtain a first rectified signal;
- rectifying the received signal to obtain a second rectified signal;
- regulating the first rectified signal;
- and
- demodulating the second rectified signal.
A system for powering a transponder, comprising:
- a means for receiving a wireless signal at the transponder;
- a first means for rectifying the received signal as a first rectified signal;
- a second means for rectifying the received signal as a second rectified signal;
- a means for regulating the first rectified signal;
- a means for demodulating the second rectified signal as a demodulated signal;
- and
- a means for processing the demodulated signal.
A system for wireless communication, comprising:
- 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
- a second rectifying bridge having at least one input terminal coupled to the oscillating circuit and having an output terminal coupled to a demodulator.
A transponder apparatus, comprising:
- an oscillating circuit 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 the first rectifying unit.
Dependencies are inferred from the claim text.