CN104771140A - RFID-based self-powered intelligent sensor - Google Patents
RFID-based self-powered intelligent sensor Download PDFInfo
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- CN104771140A CN104771140A CN201510111634.9A CN201510111634A CN104771140A CN 104771140 A CN104771140 A CN 104771140A CN 201510111634 A CN201510111634 A CN 201510111634A CN 104771140 A CN104771140 A CN 104771140A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6867—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive specially adapted to be attached or implanted in a specific body part
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
Abstract
The invention provides an RFID-based self-powered intelligent sensor. The RFID-based self-powered intelligent sensor comprises an antenna, an impedance matching circuit connected with the antenna, a demodulation circuit connected with the impedance matching circuit, a modulation circuit connected with the antenna, a power supply circuit connected with the impedance matching circuit and used for acquiring electric energy from an RFID radio frequency signal received by the antenna, a microcontroller, an electrode strip, a low-noise amplifier connected with the electrode strip, a gain amplifying circuit connected with the low-noise amplifier and a peak detection circuit connected with the gain amplifying circuit, wherein the microcontroller is connected with the output terminal of the demodulation circuit, the input terminal of the modulation circuit and the output terminal and the sensitivity adjustment terminal of the peak detection circuit respectively; the output terminal of the gain amplifying circuit is connected with the sensing signal input terminal of the microcontroller; and the peak detection circuit is used for detecting a human body sensing signal and sending a wake-up signal to the microcontroller when the human body sensing signal exceeds the threshold. The RFID-based self-powered intelligent sensor is used for internal induction testing of a human body, and adopts a passive circuit structure without batteries, thereby being low in power consumption.
Description
Technical field
The present invention relates to a kind of self-powered intelligence sensor based on RFID technique, especially and if only if detect the low power-consumption intelligent sensor that just can work when data reach requirement without the need to Power supply.
Background technology
Along with the development of electron trade, electronic technology is applied to increasing industry, and medical electronics became one of development industry of attracting attention in the world in the last few years.CT scan, X-ray check, cochlear implant transplanting etc. is all embody rule, brings great convenience to global patient.Medically under a lot of situation, need to carry out tracing detection to some body data of patient, especially carry out real-time tracking to body interior position, this is difficult point medically.The development of electronic industry also makes brain neuroblastoma systematic research and the neural artificial limb that controls make significant headway.But due to electronic equipment implant time, if there is the connecting line through skin, great infection risk can be caused, thus modern medicine be badly in need of one can without the need to power supply, carry out the equipment of data transmission with outside.The solution of maturation in the market adopts near field induction chain to fetch to obtain energy and transmission data, but this method requires that outside sensing apparatus and internal unit are in extremely short scope and so on, and this brings great restriction to therapeutic treatment and testing.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of self-powered intelligence sensor based on RFID technique is provided, adopts passive type circuit structure, institute's energy requirement can be obtained from RFID radiofrequency signal, employing wakes formula working method up, can reduce power consumption by high degree.The technical solution used in the present invention is:
Based on a self-powered intelligence sensor for RFID technique, comprising: antenna, connect antenna impedance matching circuit, connect impedance matching circuit demodulator circuit, connect antenna modulation circuit, connect impedance matching circuit and for the power circuit that obtains electric energy in the RFID radiofrequency signal that receives from antenna and microcontroller, electrode strip, the low-noise amplifier of connection electrode bar, the gain amplifying circuit of connection low-noise amplifier and the peak detection circuit being connected gain amplifying circuit;
Power circuit obtains electrical energy for storage, powers for giving microcontroller, low-noise amplifier, gain amplifying circuit and peak detection circuit;
Microcontroller connects outfan and the sensitivity adjusting end of the outfan of demodulator circuit, the input of modulation circuit and peak detection circuit respectively; The transducing signal input of the output termination microcontroller of gain amplifying circuit;
Peak detection circuit be used for electrode strip detection and through low-noise amplifier, gain amplifying circuit amplify after human sensing signal detect, when exceed human sensing signal intensity setting threshold value time, send wake-up signal to microcontroller.
Further, impedance matching circuit comprises inductance L 1 and tunable capacitor CV, and one end of inductance L 1 is connected with one end of tunable capacitor CV and connects antenna, the other end ground connection of tunable capacitor CV, and the other end of inductance L 1 is as the outfan of impedance matching circuit;
Demodulator circuit comprises diode D11, electric capacity C5, comparator U1, level translator U2, switching tube Q3; The anode of diode D11 connects the other end of inductance L 1 and the outfan of impedance matching circuit, and negative electrode connects one end of electric capacity C5, the in-phase input end of comparator U1 and positive power source terminal, and first power end of level translator U2; The other end ground connection of electric capacity C5; The anode of the anti-phase input termination diode D11 of comparator U1, export first voltage end of termination level translator U2, the drain electrode of the negative supply termination switching tube Q3 of comparator U1, the source ground of switching tube Q3, grid connects the enable signal that microcontroller exports, the input port of the second voltage termination microcontroller of the output voltage Vout of the second source termination power circuit of level translator U2, level translator U2;
The colelctor electrode of drain electrode and audion Q2 that modulation circuit comprises resistance R1, NMOS tube Q1 and NPN audion Q2, NMOS tube Q1 connects antenna 1, the source electrode of NMOS tube Q1 and the grounded emitter of audion Q2; One end of the base stage connecting resistance R1 of audion Q2, the other end of resistance R1 and the grid of NMOS tube Q1 connect the modulation signal output port of microcontroller;
Power circuit comprises the voltage doubling rectifing circuit connecting impedance matching circuit, the outfan of voltage doubling rectifing circuit connects one end of electric capacity C10 and the negative electrode of transient voltage killer tube D10 by forward diode D9, the other end of electric capacity C10 and the plus earth of transient voltage killer tube D10, the output voltage Vout of the negative electrode output power supply circuit of diode D9.
Further, gain amplifying circuit comprises operational amplifier U302 and U303, electric capacity C301 and C302, resistance R302, R303, R304, R306, R307;
Peak detection circuit comprises digital regulation resistance U305, resistance R301, R305, electric capacity C303 and comparator U304;
Electrode strip connects low-noise amplifier input, low-noise amplifier exports termination capacitor C301 one end, one end of electric capacity C301 other end connecting resistance R302 and the in-phase input end of operational amplifier U302, the in-phase input end of another termination operational amplifier U303 of resistance R302 and outfan; One end of anti-phase input terminating resistor R303 and R304 of operational amplifier U303 and one end of electric capacity C302, the other end of resistance R304 and the other end ground connection of electric capacity C302, the output voltage Vout of another termination power circuit of resistance R303; The outfan of operational amplifier U303 is by one end of resistance R307 connecting resistance R306 and the inverting input of operational amplifier U302; The power end of operational amplifier U302 and U303 all meets the output voltage Vout of power circuit; The stiff end of the other end of outfan connecting resistance R306 of operational amplifier U302, one end of resistance R305 and digital regulation resistance U305; The regulation output port of the adjustment termination microcontroller of digital regulation resistance U305, one end of sliding end connecting resistance R301 of digital regulation resistance U305 and the in-phase input end of comparator U304, the other end ground connection of resistance R301, the other end of the anti-phase input terminating resistor R305 of comparator U304 is also by electric capacity C303 ground connection; The output voltage Vout of the power supply termination power circuit of comparator U304; The interrupt signal input of the output termination microcontroller of comparator U304; The outfan of operational amplifier U302 connects the transducing signal input of microcontroller.
Further, the voltage doubling rectifing circuit in power circuit comprises the multiple and voltage multiplying rectifier electronic circuit connect.
The invention has the advantages that: sensor, without the need to external power source, obtains institute's energy requirement completely from radiofrequency signal; Power consumption is extremely low, and peak detection circuit can make microcontroller only in running order when human sensing signal peak; Amplifier noise is extremely low, can not cause signal disturbing; Sensor adopts general purpose microcontroller, is convenient to control; Sensor can communicate with general external read device.
Accompanying drawing explanation
Fig. 1 is electric theory diagram of the present invention.
Fig. 2 is impedance matching circuit of the present invention, demodulator circuit, modulation circuit, power circuit schematic diagram.
Fig. 3 is low-noise amplifier of the present invention, gain amplifying circuit and peak detection circuit schematic diagram.
Detailed description of the invention
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Figure 1, the self-powered intelligence sensor based on RFID technique that this utility model proposes, can be placed in inside of human body and detect; Comprise antenna 1, connect the impedance matching circuit 2 of antenna 1, connect the demodulator circuit 3 of impedance matching circuit 2, connect the modulation circuit 4 of antenna 1, connect impedance matching circuit 2 and for the power circuit 5 that obtains electric energy in the RFID radiofrequency signal that receives from antenna 1 and microcontroller 6, electrode strip 7, the low-noise amplifier (i.e. LNA) 8 of connection electrode bar 7, the gain amplifying circuit 9 of connection low-noise amplifier 8 and the peak detection circuit 10 being connected gain amplifying circuit 9;
Power circuit 5 stores after obtaining electric energy, powers for giving microcontroller 6, low-noise amplifier 8, gain amplifying circuit 9 and peak detection circuit 10;
Microcontroller 6 connects outfan and the sensitivity adjusting end of the outfan of demodulator circuit 3, the input of modulation circuit 4 and peak detection circuit 10 respectively; The transducing signal input of the output termination microcontroller 6 of gain amplifying circuit 9;
Peak detection circuit 10 for electrode strip 5 is detected and through low-noise amplifier 8, gain amplifying circuit 9 amplify after human sensing signal detect, when human sensing signal intensity exceedes setting threshold value, wake-up signal is sent to microcontroller 6, make sensor change duty into from resting state, communicate with the RFID reader of outside.
Below each part mentioned above circuit is elaborated.
The microcontroller 6 of core of the present invention adopts MSP430.
Antenna 1, impedance matching circuit 2, demodulator circuit 3, modulation circuit 4, power circuit 5, these circuit are see Fig. 2.
Antenna 1 meets input terminal IN1 in impedance matching circuit 2(Fig. 2 for connecting antenna), impedance matching circuit 2 comprises inductance L 1 and tunable capacitor CV, one end of inductance L 1 is connected with one end of tunable capacitor CV and connects antenna 1, the other end ground connection of tunable capacitor CV, the other end of inductance L 1 is as the outfan of impedance matching circuit 2; Inductance L 1 is 6.8nH inductance, and tunable capacitor CV range of accommodation is 5 ~ 20pF;
Demodulator circuit 3 comprises diode D11, electric capacity C5, comparator U1, level translator U2, switching tube Q3; Wherein switching tube Q3 is NMOS tube; Comparator U1 can adopt NCS2200SQ2T2G; Level translator U2 can adopt NLSV1T244; The anode of diode D11 connects the other end of inductance L 1 and the outfan of impedance matching circuit 2, and negative electrode connects one end of electric capacity C5, the in-phase input end of comparator U1 and positive power source terminal, and first power end of level translator U2 (i.e. VCCA foot); The other end ground connection of electric capacity C5; The anode of the anti-phase input termination diode D11 of comparator U1, export first voltage end (the A foot namely on U2) of termination level translator U2, the drain electrode of the negative supply termination switching tube Q3 of comparator U1, the source ground of switching tube Q3, grid connects the enable signal that microcontroller 6 exports, in Fig. 2, input terminal IN3 is for connecting the P1.3/TA2(pin sequence number 15 of MSP430); The output voltage Vout of the second source termination power circuit 5 of level translator U2, second voltage end (the B foot namely on U2) of level translator U2 connects the input port of microcontroller 6, that is to say that in Fig. 2, lead-out terminal Out1 specifically connects the P1.2/TA1(pin sequence number 14 of MSP430).
The colelctor electrode of drain electrode and audion Q2 that modulation circuit 4 comprises resistance R1, NMOS tube Q1 and NPN audion Q2, NMOS tube Q1 connects antenna 1, the source electrode of NMOS tube Q1 and the grounded emitter of audion Q2; One end of the base stage connecting resistance R1 of audion Q2, the other end of resistance R1 and the grid of NMOS tube Q1 connect the modulation signal output port of microcontroller 6, specifically connect the P1.1/TA0(pin sequence number 13 of MSP430).Namely in Fig. 2, input terminal IN2 connects the P1.1/TA0(pin sequence number 13 of MSP430).
Power circuit 5 comprises the voltage doubling rectifing circuit connecting impedance matching circuit 2, and described voltage doubling rectifing circuit is used for carrying out boosting rectification to RFID radiofrequency signal, can improve the DC voltage of the electric energy of acquisition, and by the electric capacity store electrical energy in voltage doubling rectifing circuit; This programme devises and the multiple voltage multiplying rectifier electronic circuits connect, can more than enough storage a little electric energy, to power needs to meet other each circuit.In Fig. 2, voltage doubling rectifing circuit comprises electric capacity C1 ~ C4, electric capacity C6 ~ C9, diode D1 ~ D8; Wherein, electric capacity C1 and C6, diode D1 and D2 form a voltage multiplying rectifier electronic circuit; Electric capacity C2 and C7, diode D3 and D4 form another voltage multiplying rectifier electronic circuit, by that analogy.The outfan of voltage doubling rectifing circuit connects one end of electric capacity C10 and the negative electrode of transient voltage killer tube D10 by forward diode D9, the other end of electric capacity C10 and the plus earth of transient voltage killer tube D10, the output voltage Vout of the negative electrode output power supply circuit 5 of diode D9; Electric capacity C10 is power filtering capacitor, and transient voltage killer tube D10 can prevent output voltage too high.Output voltage Vout powers to the position of other mark Vout in microcontroller 6 and Fig. 2 and Fig. 3.
When outside RFID reader carries out digital independent to this sensor, the energy in the RFID radiofrequency signal that RFID reader sends is stored in power circuit 5, in order to economize on electricity, is in resting state when microcontroller 6 is flat.Only have after microcontroller 6 is waken up, just in running order, and the U1 in demodulator circuit is opened by enable signal, communicated with RFID reader with modulation circuit 4 by demodulator circuit 3.
The low-noise amplifier (i.e. LNA) 8 of connection electrode bar 7, connect low-noise amplifier 8 gain amplifying circuit 9 be connected the peak detection circuit 10 of gain amplifying circuit 9 as shown in Figure 3.
U301 in low-noise amplifier (LNA) 8 i.e. Fig. 3, electrode strip 7 gathers human sensing signal, and the input terminal IN4 in Fig. 3 is used for connection electrode bar 7;
Gain amplifying circuit 9 comprises operational amplifier U302 and U303, electric capacity C301 and C302, resistance R302, R303, R304, R306, R307;
Peak detection circuit 10 comprises digital regulation resistance U305, resistance R301, R305, electric capacity C303 and comparator U304;
In Fig. 3, R301=300K Ω, R302=1M Ω, R303=4M Ω, R304=2M Ω, R305=1M Ω, R306=900K Ω, R307=100K Ω; C301=0.1uF, C302=100pF, C303=0.1uF; U301 is 40dB gain amplifier, U302 and U303 is OPA349, U304 be TLV3491, U305 is MCP4012;
Concrete annexation is:
Electrode strip 7 connects low-noise amplifier 8 input, low-noise amplifier 8 exports termination capacitor C301 one end, one end of electric capacity C301 other end connecting resistance R302 and the in-phase input end of operational amplifier U302, the in-phase input end of another termination operational amplifier U303 of resistance R302 and outfan; One end of anti-phase input terminating resistor R303 and R304 of operational amplifier U303 and one end of electric capacity C302, the other end of resistance R304 and the other end ground connection of electric capacity C302, the output voltage Vout of another termination power circuit 5 of resistance R303; The outfan of operational amplifier U303 is by one end of resistance R307 connecting resistance R306 and the inverting input of operational amplifier U302; The power end of operational amplifier U302 and U303 all meets the output voltage Vout of power circuit 5; The stiff end of the other end of outfan connecting resistance R306 of operational amplifier U302, one end of resistance R305 and digital regulation resistance U305; The regulation output port of the adjustment termination microcontroller 6 of digital regulation resistance U305, in Fig. 3, the adjustable side of digital regulation resistance U305 is as the sensitivity adjusting end of peak detection circuit 10, input terminal IN5 for connecting MSP430 pin P1.5/TA0 (pin sequence number 17), the namely regulation output port of microcontroller 6.One end of sliding end connecting resistance R301 of digital regulation resistance U305 and the in-phase input end of comparator U304, the other end ground connection of resistance R301, the other end of the anti-phase input terminating resistor R305 of comparator U304 is also by electric capacity C303 ground connection; The output voltage Vout of the power supply termination power circuit 5 of comparator U304; The interrupt signal input of the output termination microcontroller 6 of comparator U304, the lead-out terminal Out2 in Fig. 3 is for connecting the MSP430 pin P3.7 (pin sequence number 35) as interrupt signal input; The outfan of operational amplifier U302 connects the transducing signal input of microcontroller 6, and namely MSP430 pin P6.7/A7 (pin sequence number 6), the lead-out terminal Out3 in figure are for connecting MSP430 pin P6.7/A7 (pin sequence number 6).
In foregoing circuit, digital regulation resistance U305 is configured to rheostat, and resistance magnitude range is 0 ~ 50k; Concrete resistance is controlled by microcontroller 6, and interface is the IN5 terminal in Fig. 3; The size of resistance directly affects threshold value (be just above great value, can send interrupt signal, make system works to the microcontroller) size of peak detection section.When the human sensing signal intensity that electrode strip 7 collects is enough large, the outfan of comparator U304 exports a level skip signal, sends to microcontroller 6 to make it enter duty as wake-up signal.After peakvalue's checking completes, microcontroller 6 is communicated with RFID reader with modulation circuit 4 by demodulator circuit 3, and transmission data and reception instruction, send to RFID reader by human sensing signal data.
Containing electromagnetic energy in the RFID radiofrequency signal that RFID reader sends, through collection and the storage of electrical energy of power circuit 5, can be used for and use to other circuit.
After peakvalue's checking and transducing signal digital independent complete, in other situation, whole system is in the lower resting state of power consumption.After a working cycle terminates, microcontroller can stop the several seconds impelling artificial circuit part to recover from radiofrequency signal interference, gets back to peak value computing mode, starts the new working cycle.
Claims (4)
1. the self-powered intelligence sensor based on RFID technique, it is characterized in that, comprise: antenna (1), connect the impedance matching circuit (2) of antenna (1), connect the demodulator circuit (3) of impedance matching circuit (2), connect the modulation circuit (4) of antenna (1), connect impedance matching circuit (2) and power circuit (5) for obtaining electric energy in the RFID radiofrequency signal that receives from antenna (1), and microcontroller (6), electrode strip (7), the low-noise amplifier (8) of connection electrode bar (7), connect the gain amplifying circuit (9) of low-noise amplifier (8) and the peak detection circuit (10) being connected gain amplifying circuit (9),
Power circuit (5) obtains electrical energy for storage, for giving the power supply of microcontroller (6), low-noise amplifier (8), gain amplifying circuit (9) and peak detection circuit (10);
Microcontroller (6) connects outfan and the sensitivity adjusting end of the outfan of demodulator circuit (3), the input of modulation circuit (4) and peak detection circuit (10) respectively; The transducing signal input of the output termination microcontroller (6) of gain amplifying circuit (9);
Peak detection circuit (10) for electrode strip (5) detection and through low-noise amplifier (8), gain amplifying circuit (9) amplify after human sensing signal detect, when exceeding human sensing signal intensity setting threshold value, send wake-up signal to microcontroller (6).
2., as claimed in claim 1 based on the self-powered intelligence sensor of RFID technique, it is characterized in that:
Impedance matching circuit (2) comprises inductance L 1 and tunable capacitor CV, one end of inductance L 1 is connected with one end of tunable capacitor CV and connects antenna (1), the other end ground connection of tunable capacitor CV, the other end of inductance L 1 is as the outfan of impedance matching circuit (2);
Demodulator circuit (3) comprises diode D11, electric capacity C5, comparator U1, level translator U2, switching tube Q3; The anode of diode D11 connects the other end of inductance L 1 and the outfan of impedance matching circuit 2, and negative electrode connects one end of electric capacity C5, the in-phase input end of comparator U1 and positive power source terminal, and first power end of level translator U2; The other end ground connection of electric capacity C5; The anode of the anti-phase input termination diode D11 of comparator U1, export first voltage end of termination level translator U2, the drain electrode of the negative supply termination switching tube Q3 of comparator U1, the source ground of switching tube Q3, grid connects the enable signal that microcontroller (6) exports, the input port of the second voltage termination microcontroller (6) of the output voltage Vout of the second source termination power circuit (5) of level translator U2, level translator U2;
The colelctor electrode of drain electrode and audion Q2 that modulation circuit (4) comprises resistance R1, NMOS tube Q1 and NPN audion Q2, NMOS tube Q1 connects antenna 1, the source electrode of NMOS tube Q1 and the grounded emitter of audion Q2; One end of the base stage connecting resistance R1 of audion Q2, the other end of resistance R1 and the grid of NMOS tube Q1 connect the modulation signal output port of microcontroller (6);
Power circuit (5) comprises the voltage doubling rectifing circuit connecting impedance matching circuit (2), the outfan of voltage doubling rectifing circuit connects one end of electric capacity C10 and the negative electrode of transient voltage killer tube D10 by forward diode D9, the other end of electric capacity C10 and the plus earth of transient voltage killer tube D10, the output voltage Vout of the negative electrode output power supply circuit (5) of diode D9.
3., as claimed in claim 2 based on the self-powered intelligence sensor of RFID technique, it is characterized in that:
Gain amplifying circuit (9) comprises operational amplifier U302 and U303, electric capacity C301 and C302, resistance R302, R303, R304, R306, R307;
Peak detection circuit (10) comprises digital regulation resistance U305, resistance R301, R305, electric capacity C303 and comparator U304;
Electrode strip (7) connects low-noise amplifier (8) input, low-noise amplifier (8) exports termination capacitor C301 one end, one end of electric capacity C301 other end connecting resistance R302 and the in-phase input end of operational amplifier U302, the in-phase input end of another termination operational amplifier U303 of resistance R302 and outfan; One end of anti-phase input terminating resistor R303 and R304 of operational amplifier U303 and one end of electric capacity C302, the other end of resistance R304 and the other end ground connection of electric capacity C302, the output voltage Vout of another termination power circuit (5) of resistance R303; The outfan of operational amplifier U303 is by one end of resistance R307 connecting resistance R306 and the inverting input of operational amplifier U302; The power end of operational amplifier U302 and U303 all meets the output voltage Vout of power circuit (5); The stiff end of the other end of outfan connecting resistance R306 of operational amplifier U302, one end of resistance R305 and digital regulation resistance U305; The regulation output port of the adjustment termination microcontroller (6) of digital regulation resistance U305, one end of sliding end connecting resistance R301 of digital regulation resistance U305 and the in-phase input end of comparator U304, the other end ground connection of resistance R301, the other end of the anti-phase input terminating resistor R305 of comparator U304 is also by electric capacity C303 ground connection; The output voltage Vout of the power supply termination power circuit (5) of comparator U304; The interrupt signal input of the output termination microcontroller (6) of comparator U304; The outfan of operational amplifier U302 connects the transducing signal input of microcontroller (6).
4., as claimed in claim 2 based on the self-powered intelligence sensor of RFID technique, it is characterized in that:
Voltage doubling rectifing circuit in power circuit (5) comprises the multiple and voltage multiplying rectifier electronic circuit connect.
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| CN201510111634.9A CN104771140A (en) | 2015-03-13 | 2015-03-13 | RFID-based self-powered intelligent sensor |
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| CN201510111634.9A CN104771140A (en) | 2015-03-13 | 2015-03-13 | RFID-based self-powered intelligent sensor |
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| CN107634723A (en) * | 2017-08-15 | 2018-01-26 | 东南大学 | The clamped beam mixing system of the clutter collection of energy of internet of things oriented |
| CN107645284A (en) * | 2017-08-15 | 2018-01-30 | 东南大学 | The clamped beam perseverance width device that the excess energy of the Autonomous test of internet of things oriented is collected |
| CN107920787A (en) * | 2015-08-26 | 2018-04-17 | ams有限公司 | Circuit device for light detection system and the method for light detection |
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