CN104281869A - Wireless temperature electronic tag based on radio frequency technology - Google Patents
Wireless temperature electronic tag based on radio frequency technology Download PDFInfo
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- CN104281869A CN104281869A CN201410553350.0A CN201410553350A CN104281869A CN 104281869 A CN104281869 A CN 104281869A CN 201410553350 A CN201410553350 A CN 201410553350A CN 104281869 A CN104281869 A CN 104281869A
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Abstract
The invention provides a wireless temperature electronic tag based on the radio frequency technology. The wireless temperature electronic tag comprises an antenna, a simulation radio frequency front end circuit and a logic control circuit, wherein the antenna, the simulation radio frequency front end circuit and the logic control circuit are sequentially connected. The simulation radio frequency front end circuit comprises a rectifying circuit module, a temperature detection circuit, an oscillator module, a demodulator and a backscattering circuit, wherein the temperature detection circuit, the oscillator module, the demodulator and the backscattering circuit are connected with the logic control circuit. The antenna and a rectifying circuit form an energy extraction circuit, and an FPGA module is adopted in the logic control circuit. The wireless temperature electronic tag has the advantages that power consumption is low, and the induction antenna is small in size, low in cost and far in communication distance.
Description
Technical field
The present invention relates to radio temperature sensor circuit, especially relate to a kind of wireless temperature electronic tag based on radio-frequency technique.
Background technology
Current wireless temperature sensor is primarily of battery, temperature-sensing element, control circuit, transmission circuit composition.This kind of sensor has volume large, the shortcomings such as low temperature condition battery cisco unity malfunction.
RDIF (Radio Frequency Identification) radio RF recognition technology have contactless, memory capacity is large, recognition speed is fast, distance, can block the advantages such as identification more.According to or without powered battery, its radio-frequency (RF) tag can be divided into active label and passive label two kinds, and passive label only need coordinate reader can carry out identifying, Signal transmissions work.Temperature sensor and passive RF label are combined, form the radio-frequency front-end of wireless transmission measured temperature, take up room little, cost increases few, can be used for any other thermally sensitive article collecting temperature information in blood product, vaccine refrigerating, perishable foodstuffs and logistics.
The temperature electronic label of existing employing radio-frequency technique is due to the restriction of antenna structure, and volume is large, cannot be arranged in the small containers such as cillin bottle; The scheme of voltage difference measures of quantization temperature, needs digital to analog converter conversion, and its power consumption is comparatively large, causes wireless transmission distance nearer.
Summary of the invention
The present invention adopts the passive temperature electronic tag based on RDIF technology, and solve the problem that current low-temperature sensor needs battery or cable power, its technical scheme is as described below:
A kind of wireless temperature electronic tag based on radio-frequency technique, comprise the antenna, analog radio frequency front-end circuit, the logic control circuit that connect successively, described analog radio frequency front-end circuit comprises rectification circuit module, and temperature sensing circuit, oscillator module, detuner, the backscatter circuit to be connected with logic control circuit, described antenna and rectification circuit composition Energy extraction circuit, described logic control circuit adopts FPGA module.
Described antenna adopts the microstrip antenna designs of circular polarisation.
Described rectification circuit is used for ac voltage signal to be converted into DC voltage, is connected with voltage reference circuit with mu balanced circuit, and described voltage reference circuit provides stable supply voltage for baseband circuit.
Described rectification circuit is also connected with voltage limiter protection circuit.
Described detuner, backscatter circuit are directly connected with antenna.
Described FPGA module comprises state machine, decoding coding, cryptographic check, anti-collision function module.
The rectifying device of described rectification circuit adopts schottky diode.
Described temperature sensing circuit comprises reference circuit module, the first oscillator, the second oscillator, frequency divider, oscillator breaking circuit, counter, described reference circuit module is connected with the first oscillator, the second oscillator, described oscillator breaking circuit is connected with the first oscillator, the second oscillator, described frequency divider is connected with the first oscillator, and described second oscillator, frequency divider are connected with counter.
Described first oscillator, the second oscillator structure are identical, adopt ring oscillator structure, are made up of the reference current generating circuit connected successively, 1 comparer, 3 phase inverters, charge-discharge circuits.
The present invention be directed to the problem that current passive radio frequency temperature electronic tag circuit power consumption is large, induction antenna size is large, signal transmission distance is near, propose following solution: adopt the mode measuring tempeature to pulsewidth counting, preferably resolve the problem of low-power consumption; Adopt the micro-strip antenna of circular polarisation, and make the impedance of antenna and the input resistant matching of passive RF label, realize the features such as induction antenna volume is little, low cost, communication distance are far away.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the wireless temperature electronic tag based on radio-frequency technique provided by the invention;
Fig. 2 is the structural representation of described circular polarized antenna;
Fig. 3 is the circuit diagram of described rectification circuit;
Fig. 4 is the circuit diagram of described temperature sensing circuit;
Fig. 5 is the circuit diagram of described oscillator.
Embodiment
Passive RF temperature electronic label, mainly comprises antenna, analog radio frequency front-end circuit, logic control circuit three basic function module.
As shown in Figure 1, antenna receives radiofrequency signal, Signal transmissions to voltage doubling rectifing circuit and detuner.The effect of rectifier is that the AC signal received by antenna is converted to DC voltage, produces the power supply needed for label chip.Rectification circuit is that higher DC voltage VDD exports to mu balanced circuit and voltage reference circuit the energy conversion received, and for baseband circuit produces stable supply voltage REFVDD, about 1.65V, along with temperature is different with process corner and change.Described rectification circuit is also connected with voltage limiter protection circuit, is realized by voltage stabilizer, and the effect of described voltage stabilizer is that the DC voltage produced for rectifier provides earial drainage branch road, produces stable supply voltage, thus plays the effect of amplitude limit to supply voltage.Thus prevent input voltage too high, chip internal circuits is punctured damage.Detuner is connected with antenna by matching network with backscatter circuit: detuner demodulates useful data and sends to logic processing module to be for further processing from input signal; Backscatter circuit reaches the object changing chip input impedance by the electric capacity changing self, thus realizes ASK modulation.Oscillator in system provides stable clock signal for baseband circuit.
Described analog radio frequency front-end circuit comprises temperature sensing circuit, rectification circuit module, voltage of voltage regulation circuit, oscillator module, detuner, backscatter circuit and associated data interface module.
Described logic control circuit adopts ripe FPGA (Field Programmable Gate Array field programmable gate array) module to realize this function, described FPGA module inside comprises the functional modules such as state machine, decoding coding, cryptographic check, anti-collision, command decode, data check can be realized, complete the control operation of radio frequency interface, EEPROM, thus the function completed required by agreement, no longer describe in detail herein.
In the present invention, described antenna as shown in Figure 2, adopts the microstrip antenna designs of circular polarisation, and antenna volume reduces a lot than other schemes.Energy extraction circuit is formed by antenna and N level voltage doubling rectifing circuit.Antenna receives the radio-frequency (RF) energy sent from card reader, and is that ac voltage signal is transferred to N level voltage doubling rectifing circuit energy conversion; N level voltage doubling rectifing circuit is used for ac voltage signal to be converted into higher DC voltage, provides galvanic current source for chip normally works.
In radio electronic label, the area of antenna is occupied an leading position, and its area determines the size of label.Due to the reduction of circuit power consumption, the antenna in the design adopts circular polarisation, and enables its impedance and the input resistant matching of label chip, has less radiation mode and the interference of return loss.
As shown in Figure 3, its rectifying device adopts schottky diode to described voltage doubling rectifing circuit structure.In figure, Cm is the boost capacitor of every one-level, and every two diodes form one group of booster circuit, and a total N level, the value of N is according to integrated circuit requirement, and value is 4.The value of output load capacitance Cout is more much larger than Cm, is used for the ripple produced in filtering boost process, thus makes the DC voltage of voltage doubling rectifing circuit stable output, and large load capacitance also serves the effect of storage power simultaneously.
Described temperature sensing circuit as shown in Figure 4, mainly be divided into 6 modules: 1) reference circuit module: this module produces a reference current and is supplied to two discharge and recharges of oscillators realization to its electric capacity, produces simultaneously and is not subject to the reference voltage V REF of influence of temperature change and temperature variant reference voltage V BE to be input to oscillator 2 and oscillator 1 respectively.
2) oscillator 1: this oscillator produces one-period signal, and the cycle of this signal is relevant with reference current, VBE and technique.
3) oscillator 2: this oscillator also produces one-period signal, the cycle of this signal is also relevant with reference current, VREF and technique, but oscillator 1 is identical with oscillator 2 structure, thus counteracts the impact of technique.
4) frequency divider: due to two oscillators cycle relatively, in order to the change in cycle can be detected, need the signal to oscillator 1 exports to carry out frequency division, and using the enable signal of the signal after frequency division as counter, in literary composition, adopt 512 frequency divisions.
5) oscillator breaking circuit: this module produces a signal that oscillator has been turned off after having counted.
6) counter: this module exports count value, for adjudicating measured temperature.
Its circuit working principle is as follows:
After enable signal arrives, counter resets, oscillator 1 and oscillator 2 start vibration.Oscillator 1 outputs signal sends into frequency divider, produces a T_EN signal, as the enable signal of counter after frequency division.The clock signal T_CLK that oscillator 2 produces is as the clock of counter, and the arrival on each T_CLK just edge, counter exports increase by 1.When counting terminates, time namely T_EN signal becomes low, breaking circuit, after a few microsecond of delay, produces a signal that reference current and oscillator are turned off, thus avoids counter repeat count, reduce power consumption simultaneously.Utilize the temperature characterisitic of T_EN signal, can temperature be parsed by the count value of counter.
Described oscillator adopts ring oscillator structure, and as shown in Figure 5, it is by 1 comparer, 3 phase inverters, 1 charge-discharge circuit and reference current generating circuit composition.In circuit, two ring oscillators adopt same current reference to carry out discharge and recharge to electric capacity, and therefore electric current can be offset the impact of oscillator with the change of temperature, technique etc., can not have an impact to the measurement result of temperature.
Because oscillator 1 is identical with oscillator 2 circuit structure, electric capacity C capacitance is identical, and charging and discharging currents size is identical, and therefore, the cycle of oscillator only depends on reference voltage.
The present invention has low-power consumption, realizes the features such as induction antenna volume is little, low cost, communication distance are far away.
Claims (9)
1. the wireless temperature electronic tag based on radio-frequency technique, it is characterized in that: comprise the antenna, analog radio frequency front-end circuit, the logic control circuit that connect successively, described analog radio frequency front-end circuit comprises rectification circuit module, and temperature sensing circuit, oscillator module, detuner, the backscatter circuit to be connected with logic control circuit, described antenna and rectification circuit composition Energy extraction circuit, described logic control circuit adopts FPGA module.
2. the wireless temperature electronic tag based on radio-frequency technique according to claim 1, is characterized in that: described antenna adopts the microstrip antenna designs of circular polarisation.
3. the wireless temperature electronic tag based on radio-frequency technique according to claim 1, it is characterized in that: described rectification circuit is used for ac voltage signal to be converted into DC voltage, be connected with voltage reference circuit with mu balanced circuit, described voltage reference circuit provides stable supply voltage for baseband circuit.
4. the wireless temperature electronic tag based on radio-frequency technique according to claim 3, is characterized in that: described rectification circuit is also connected with voltage limiter protection circuit.
5. the wireless temperature electronic tag based on radio-frequency technique according to claim 1, is characterized in that: described detuner, backscatter circuit are directly connected with antenna.
6. the wireless temperature electronic tag based on radio-frequency technique according to claim 1, is characterized in that: described FPGA module comprises state machine, decoding coding, cryptographic check, anti-collision function module.
7. the wireless temperature electronic tag based on radio-frequency technique according to claim 1, is characterized in that: the rectifying device of described rectification circuit adopts schottky diode.
8. the wireless temperature electronic tag based on radio-frequency technique according to claim 1, it is characterized in that: described temperature sensing circuit comprises reference circuit module, the first oscillator, the second oscillator, frequency divider, oscillator breaking circuit, counter, described reference circuit module is connected with the first oscillator, the second oscillator, described oscillator breaking circuit is connected with the first oscillator, the second oscillator, described frequency divider is connected with the first oscillator, and described second oscillator, frequency divider are connected with counter.
9. the wireless temperature electronic tag based on radio-frequency technique according to claim 8, it is characterized in that: described first oscillator, the second oscillator structure are identical, adopt ring oscillator structure, be made up of the reference current generating circuit connected successively, 1 comparer, 3 phase inverters, charge-discharge circuits.
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| CN201410553350.0A CN104281869A (en) | 2014-10-17 | 2014-10-17 | Wireless temperature electronic tag based on radio frequency technology |
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Cited By (6)
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| CN106840462A (en) * | 2017-01-18 | 2017-06-13 | 无锡艾立德智能科技有限公司 | A kind of Micro Energy Lose temperature sensor |
| CN107014499A (en) * | 2017-05-19 | 2017-08-04 | 华东交通大学 | A kind of ultra-low power consumption wireless passive temperature sensor |
| CN108061611A (en) * | 2017-12-10 | 2018-05-22 | 北京工业大学 | A kind of apparatus and method using FPGA embedded toroidals oscillator measurement Temperature Distribution |
| CN109948388A (en) * | 2019-03-21 | 2019-06-28 | 苏州国网电子科技有限公司 | Fully automated management information collecting device |
| CN111242261A (en) * | 2018-11-28 | 2020-06-05 | 宝钢工程技术集团有限公司 | Special explosion-proof active access control card for coke oven and use method thereof |
| CN111797963A (en) * | 2020-07-10 | 2020-10-20 | 中电科技集团重庆声光电有限公司 | Impedance type wireless passive sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840462A (en) * | 2017-01-18 | 2017-06-13 | 无锡艾立德智能科技有限公司 | A kind of Micro Energy Lose temperature sensor |
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| CN108061611A (en) * | 2017-12-10 | 2018-05-22 | 北京工业大学 | A kind of apparatus and method using FPGA embedded toroidals oscillator measurement Temperature Distribution |
| CN111242261A (en) * | 2018-11-28 | 2020-06-05 | 宝钢工程技术集团有限公司 | Special explosion-proof active access control card for coke oven and use method thereof |
| CN109948388A (en) * | 2019-03-21 | 2019-06-28 | 苏州国网电子科技有限公司 | Fully automated management information collecting device |
| CN111797963A (en) * | 2020-07-10 | 2020-10-20 | 中电科技集团重庆声光电有限公司 | Impedance type wireless passive sensor |
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