Sensor tag, sensor tag device, power receiving circuit, and sensor tag device power supply method
First Claim
1. A sensor tag, comprising:
- a transmission/reception antenna, a power receiving circuit, and a microprocessor,wherein the power receiving circuit enabling bi-directional communication is combined with a stab resonance boost circuit and a ladder boost rectification circuit,the ladder boost rectification circuit comprises an input connected to an antenna power feed point for receiving a single phase input signal,the ladder boost rectification circuit boosting and rectifying the single phase input signal,the ladder boost rectification circuit further comprising a Cockcroft-Walton circuit formed of a plurality of diodes, a plurality of ground-side capacitors, and a plurality of power-receiving-side capacitors, where a first diode on an input side being removed and a capacitance value of each power-receiving-side capacitor being smaller than a capacitance value of each ground-side capacitor, with the stab resonance boost circuit being used for the removed first diode on the input side at the input connected to the antenna power feed point.
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Abstract
There is provided a sensor tag device capable of detecting event data by a sensor tag all the time even when no radio wave is received, saving power supply for a microprocessor, and enlarging the radio communication distance. The sensor tag device includes generation means 6 and 7 using one or more environmental changes, power supply voltage rise control means 8, and power supply synthesis means 9, and power is supplied to a microprocessor 12 and event data is stored in the microprocessor 12 when an event, i.e., an environmental change has occurred. A power receiving circuit having a transmission/reception antenna, a built-in power receiving circuit, and the microprocessor and capable of bi-directional communication by radio waves is combined with a stab resonance RF boost circuit and a ladder boost rectification circuit.
25 Citations
20 Claims
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1. A sensor tag, comprising:
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a transmission/reception antenna, a power receiving circuit, and a microprocessor, wherein the power receiving circuit enabling bi-directional communication is combined with a stab resonance boost circuit and a ladder boost rectification circuit, the ladder boost rectification circuit comprises an input connected to an antenna power feed point for receiving a single phase input signal, the ladder boost rectification circuit boosting and rectifying the single phase input signal, the ladder boost rectification circuit further comprising a Cockcroft-Walton circuit formed of a plurality of diodes, a plurality of ground-side capacitors, and a plurality of power-receiving-side capacitors, where a first diode on an input side being removed and a capacitance value of each power-receiving-side capacitor being smaller than a capacitance value of each ground-side capacitor, with the stab resonance boost circuit being used for the removed first diode on the input side at the input connected to the antenna power feed point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11, 12, 13, 14, 15, 19, 20)
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9. A sensor tag device comprising:
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a power generation means utilizing one or more changes in an environment to generate power as a power supply; power supply voltage rise control means connected to control said power generation means, said power supply voltage rise control means controlling a power supply voltage by a Schmidt trigger threshold value; a microprocessor connected to receive generated power from the power generation means, wherein a single or synthesized supply power is supplied to the microprocessor through the power supply voltage rise control means; and power supply synthesis means which synthesizes the power supply voltage obtained from the generation means, wherein a change in the environment is determined as an event, and event data is stored in the microprocessor at the same time not receiving the power supply except from the generation means when this event occurs. - View Dependent Claims (10)
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16. A power receiving circuit comprising:
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an antenna power feed point; a capacitive power feed impedance; a circuit which includes a stab resonator and a ladder boost rectification circuit connected with the antenna power feed point through the capacitive power feed impedance whose capacitance is adequately small to around 1 pF to 0.1 pF being divided by the using frequency per GHz unit, wherein said ladder boost rectification circuit operates only by single phase input signal, wherein said circuit boosts an RF input signal by a bottom board conductor, and also boosts and rectifies an input signal supplied from the antenna power feed to feed a power to an external load, wherein the power receiving circuit resonates the short stab resonator and the capacitive power feed impedance whose capacitance is adequately small in series, and the power receiving circuit resonates the short stab resonator and a capacitive load impedance formed of the ladder boost rectification circuit in parallel so that a high Q value is realized and the power conversion efficiency is improved. - View Dependent Claims (17)
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18. A sensor tag device power supply method, the sensor tag device comprising a stab resonator and a ladder boost rectification circuit, the method comprising:
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achieving connection of a single-phase input signal through an antenna power feed point and a capacitive power feed impedance; resonating the stab resonator and the capacitive power feed impedance in series to boost the input signal; and resonating the stab resonator and a capacitive load impedance formed of the ladder boost rectification circuit in parallel for maintaining an inductive impedance while boosting and rectifying the input signal supplied from the antenna power feed point to feed a power to an external load, wherein the ladder boost rectification circuit comprises an input connected to an antenna power feed point for receiving the single phase input signal, the ladder boost rectification circuit further comprising a Cockcroft-Walton circuit formed of a plurality of diodes, a plurality of ground-side capacitors, and a plurality of power-receiving-side capacitors, where a first diode on an input side being removed and a capacitance value of each power-receiving-side capacitor being smaller than a capacitance value of each ground-side capacitor, with the stab resonance boost circuit being used for the removed first diode on the input side at the input connected to the antenna power feed point.
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Specification