CN209689769U - A kind of passive wireless temperature sensor - Google Patents
A kind of passive wireless temperature sensor Download PDFInfo
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- CN209689769U CN209689769U CN201822020509.9U CN201822020509U CN209689769U CN 209689769 U CN209689769 U CN 209689769U CN 201822020509 U CN201822020509 U CN 201822020509U CN 209689769 U CN209689769 U CN 209689769U
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/01—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using semiconducting elements having PN junctions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model discloses a kind of passive wireless temperature sensors, belong to wireless sensing field.A kind of passive wireless temperature sensor, including receiving antenna, RF energy collection module, protective module, power management module, modulation /demodulation module, data management module, temperature measurement module, external sensor module, wireless transmitter module, transmitting antenna, accessory power supply, wireless energy transmission module, receiving module sheet.Utility model generates electric current by electromagnetic induction principle using RF energy collection module and wireless energy transmission module, is the circuit power supply in environment to be measured, solves the powerup issue of circuit under particular surroundings；Use Schottky diode as temperature element, the Schottky diode of the special material of use has the characteristics that high temperature resistant, high pressure, high frequency, solve the problems, such as that ordinary sensors fail in particular circumstances as warm element is adopted；Without direct power supply unit in the circuit of environment to be measured, there is no data transmission flat cable, structure is simple, and layout is convenient.
Description
Technical field
The utility model relates to a kind of passive wireless temperature sensors, belong to wireless sensing field.
Background technique
Temperature sensor is widely used in agricultural production, microelectronic technique is researched and developed and the fields such as production, aerospace.So
And in the presence of a harsh environment, such as the environment such as high temperature, closed, high speed rotation, accurate temperature measurement are still a great challenge
The problem of.There are power supply replacement, maintenance cost, security risk, thermometrics to limit to for active wired temperature sensor technology, size is bigger than normal,
The problems such as layout is inconvenient.
Studies have shown that Schottky diode forward current is constant, and in certain temperature range, the forward voltage drop at device both ends
There are linear relationships between temperature change, and using this characteristic, Schottky diode can be used for manufacturing temperature sensor.Compared to
PN junction diode, Schottky diode have significant temperature sensitivity, special material and structure within the scope of certain temperature
The Schottky diode of manufacture have high temperature resistant, high pressure, the characteristic of high frequency, be more suitable particular surroundings high-precision temperature survey
Amount.
Though having in the prior art using Schottky diode, varied with temperature according to Schottky diode voltage-current characteristic
The characteristics of carry out temperature collection, but used scheme is mostly that directly to turn direct current using alternating current be that circuit is powered, use
Winding displacement transmits data, and the powerup issue of such scheme circuit under complicated particular surroundings will consider the tolerance of power supply
It spends and the setting of whole system and wiring is all extremely difficult；Such as high-temperature boiler, mechanical pump, in High-voltage Electric tank confined space,
Wired power supply mode and complicated data transmission link do not adapt to actual test environment.
Utility model content
In order to solve above-mentioned the deficiencies in the prior art, the utility model provides a kind of passive nothing that can be used in particular surroundings
Line temperature sensor can be applied to the temperature measurement under adverse circumstances, it not only can satisfy some strict requirements, but also
It solves the problems, such as power supply, power supply is not needed in environment to be measured, data transmission is using wireless transmission, so that the cloth of whole device
Line, structure are all very simple.
A kind of passive wireless temperature sensor of the utility model: including receiving antenna, RF energy collection module, protection
Module, power management module, modulation /demodulation module, data management module, temperature measurement module, external sensor module, wireless transmission
Module, transmitting antenna, accessory power supply, wireless energy transmission module, external receiving module.
In one embodiment, the transmitting antenna includes the signal transmitting antenna and wireless energy of wireless transmitter module
Measure the microwave transmitting antenna of transmitting module；The receiving antenna includes the signal receiving antenna and radio frequency energy of external receiving module
Measure the microwave antenna of collection module.
In one embodiment, the RF energy collection module, protective module, power management module, modulatedemodulate
Mode transfer block, data management module, temperature measurement module, external sensor module, wireless transmitter module, accessory power supply are arranged in ring to be measured
In border；The wireless energy transmission module, external receiving module are arranged far from environment to be measured.
In one embodiment, the wireless energy transmission module include microwave generator, it is capacitor, triode, micro-
Wave transmitting antenna；Microwave generator passes through capacitor and microwave by the collector of the connection of the base stage of capacitor and triode, triode
The emitter of the series connection of transmitting antenna one end, the other end of microwave transmitting antenna and triode, the cathode of microwave generator are grounded.
In one embodiment, the input of the output termination RF energy collection module of the microwave antenna
End；The input terminal of output the termination protective module and power management module of RF energy collection module；The output end of protective module
Connect the input terminal of modulation /demodulation module；The input terminal of the output termination temperature measurement module of power management module and enabled one switched
End；The input terminal of the output termination data management module of modulation /demodulation module；The output of data management module terminates power management
The input terminal of module；The output of temperature measurement module terminates wireless transmitter module；The output of external sensor module terminates data management
The enable end of module and enabled switch；The enabled switch of input termination of wireless transmitter module is connected with power management module output end
The one end connect；Signal transmitting antenna connects the output end of wireless transmitter module；Accessory power supply connects power management module.
In one embodiment, the RF energy collection module, including it is microwave antenna, electromagnetic coil, automatic
Impedance matching circuit, self-adapted commutation circuit；Microwave antenna is converted the electromagnetic wave in space by electromagnetic induction principle
For alternating current, alternating current is provided directly by exporting direct current after self-adapted commutation circuit rectification variation for the circuit in environment to be measured
Galvanic electricity pressure；Self-adapted commutation circuit can also adjust rectification circuit series according to the power level of external radio-frequency signal, automatic to hinder
Anti- match circuit carries out impedance matching according to the variation of series；RF energy collection module for capture electromagnetism in space break and incite somebody to action
It is converted to electric energy and provides energy for the circuit in environment to be measured；Particularly microwave antenna receives the microwave in space
Transformation, the transformation of microwave can cause the magnetic field around electromagnetic coil to convert, and can generate on electromagnetic coil after the transformation of magnetic field
Electric current, by that can export a stable electric current after rectifier circuit rectifies, size of current is 500 μ A, passes through current-limiting circuit
Generate a voltage rating output voltage Vout, voltage swing 2V；It can power for other circuits, to assist power source charges.
In one embodiment, the protective module, for the improper high output of limitation of radio frequency energy collection module
Power protects the internal components of circuit behind RF energy collection module.
In one embodiment, the power management module, including pre-detector, primary detector, electric power selection apparatus, deposit
Storage is held；Pre-detector can track the size of RF radiofrequency signal input power；The output of primary detector decides whether using auxiliary
Help power supply；Electric power selection apparatus selects accessory power supply mode or Passive Mode；Storage capacitance is used to store excess energy；Power management
The signal behavior operating mode that module can be exported according to the input power size and pre-detector of external RF RF energy；It is described
Operating mode be auxiliary electric source modes and Passive Mode, accessory power supply mode is that accessory power supply is that circuit in environment to be measured supplies
Electricity, Passive Mode are that RF energy collection module is powered for the circuit in environment to be measured.The pre-detector is penetrated by comparing
Frequency energy collection module output voltage and cell voltage export a signal.Electric power selection apparatus is believed according to the output of pre-detector
Number selection powering mode, i.e., accessory power supply power supply or RF energy collection module power supply.Storage capacitance is for storing collection of energy
The extra output voltage of circuit.
In one embodiment, the modulation /demodulation module, including modem, clock generator；Modulation /demodulation
Device is used for the processing of data, passes to data management module or receives data from data management module；Clock generator is for producing
Generating clock signal.
In one embodiment, the data management module, processing and storage for data.
In one embodiment, the temperature measurement module, including Schottky diode adopt circuit temperature, A/D converter circuit；Xiao
Special based diode, which adopts circuit temperature, can acquire temperature in environment to be measured；A/D converter circuit can be converted to analog voltage signal
Digital signal simultaneously passes to wireless sending module.
In one embodiment, it includes the first Schottky diode D that the Schottky diode, which adopts circuit temperature,1With
Two Schottky diode D2, the first operational amplifier A1, second operational amplifier A2With the metal-oxide-semiconductor and inductance for constituting circuit, with the
The concatenated resistance R of two Schottky diodes1, the first Schottky diode is connected with one end of the first operational amplifier, and first
The other end of operational amplifier is connected with the input of the anode of the second Schottky diode, second operational amplifier respectively；The
The output voltage of one operational amplifier is V2, the output voltage of second operational amplifier is V1, the metal-oxide-semiconductor M of temperature measurement module2Leakage
The electric current of pole is the electric current I of a variationptat, metal-oxide-semiconductor M1Drain electrode electric current be a reference current I1, Schottky diode
Adopting circuit temperature uses various sizes of Schottky diode as temperature element, the first Schottky diode and the second Schottky two
Voltage difference between pole pipe generates the voltage analog of a PTAT, the electric current I of outputptatThe calculation formula of size is formula
(1):
Wherein k is Boltzmann constant, and T is temperature, and N is the knot of the first Schottky diode and the second Schottky diode
Area ratio, q are electronic charge, and R is resistance R1Resistance value；First Schottky diode and the second Schottky diode exist respectively
Given bias current IDUnder, the first Schottky diode and the second Schottky diode both ends generate a voltage drop V respectivelyD,
The calculation formula of its size is formula (2):
Wherein, RsFor the first Schottky diode equivalent resistance corresponding with the second Schottky diode, IsFor the first Xiao Te
Based diode and the corresponding saturation current of the second Schottky diode.
In one embodiment, the input voltage of the A/D converter circuit is the output voltage of temperature collecting module
V2, export as a square-wave signal corresponding with temperature.
In one embodiment, the wireless transmitter module includes capacitor, inductance, triode, the letter for constituting circuit
Number transmitting antenna；The input of wireless transmitter module is to adopt the temperature square wave data of the A/D converter circuit output of warm module, signal hair
External receiving module can be transferred to for the transmitting of the temperature square wave data of acquisition by penetrating antenna.
In one embodiment, the receiving module includes that signal receives electric wire, inductance, diode, capacitor, operation
Amplifier；Signal receiving antenna is connect by inductance with operational amplifier.
In one embodiment, the anode metal material of first Schottky diode and the second Schottky diode
Material is any one in aluminium, gold, molybdenum, nickel and titanium, semiconductor material Si, GaN, diamond, any one in SiC.
In one embodiment, the external sensor module, including it is chopper amplifier, multiplexer, programmable
Gain amplifier, successive approximation register converter；Chopper amplifier inhibits 1/f noise for promoting external signal
And offset voltage；Multiplexer is for receiving multiple external sensor signals；Programmable gain amplifier is to adjustment signal
It is supplied to the signal amplitude of the suitable input range of converter；Successive approximation register converter is used to realize medium turn
Change rate and low-power consumption；Entire external sensor module makes system enter the shapes such as suspend mode, wake-up, holding for receiving external command
State.
In one embodiment, the wireless transmitter module, for giving total data in defined working frequency range
It sends in real time.
The advantages of the utility model:
Compared with the prior art, the advantages of the utility model are:
(1) passive wireless temperature sensor of the utility model is arranged far from ring to be measured using wireless energy transmission module
At border, RF energy receiving module is provided in environment to be measured, the microwave antenna of RF energy receiving module can capture
The electromagnetic wave that wireless energy transmission module emits in space, and will be exchanged by the self-adapted commutation circuit of RF energy receiving module
Signal is converted to direct current signal, be environment to be measured in circuit power supply, for assist power supply power supply, such set-up mode make to
The test module surveyed in environment does not need direct power supply unit, solves the powerup issue of test device under particular surroundings；
(2) in the passive wireless temperature sensor of the utility model, the Schottky diode of temperature measurement module adopts circuit temperature energy
The temperature data in environment to be measured is enough collected, is passed through after A/D converter circuit converts analog signals into square wave digital signal
It crosses transmitting module to send with specific working frequency range, receiving module at the far end, which is arranged, can receive the temperature of environment to be measured
Degree evidence；Solves the problems, such as data transmission wiring under particular surroundings；
(3) in the passive wireless temperature sensor of the utility model, the Schottky diode of temperature collecting module adopts warm electricity
Road uses Schottky diode as temperature element, is reacted according to Schottky diode voltage with the characteristic that temperature linearity changes
The variation of temperature；The Schottky diode for the special material that the utility model uses has high temperature resistant, height as warm element is adopted
The characteristics of pressure, high frequency, solve the problems, such as that ordinary sensors fail in particular circumstances；
(4) passive wireless temperature sensor of the utility model does not have direct power supply unit, does not have data transmission flat cable, knot
Structure is simple, and layout is convenient.
Detailed description of the invention
Fig. 1 is the partial structural diagram of the passive wireless temperature sensor of the utility model；
Fig. 2 is the overall structure diagram of the passive wireless temperature sensor of the utility model；
Fig. 3 is the wireless energy transmission module circuit diagram of the passive wireless temperature sensor of the utility model；
Fig. 4 is the RF energy collection module circuit diagram of the passive wireless temperature sensor of the utility model；
Fig. 5 is that the temperature measurement module Schottky diode of the passive wireless temperature sensor of the utility model adopts circuit temperature figure；
Fig. 6 is the AD converter circuit figure of the temperature measurement module of the passive wireless temperature sensor of the utility model；
Fig. 7 is that current impulse turns in the A/D converter circuit of the temperature measurement module of the passive wireless temperature sensor of the utility model
Change figure；
Fig. 8 is the radio emitting modular circuit figure of the passive wireless temperature sensor of the utility model；
Fig. 9 is the external receiving module circuit diagram of the passive wireless temperature sensor of the utility model；
Figure 10 is that a kind of passive wireless sensor of the utility model measures temperature data curve graph under closed environment；
Figure 11 is actual temperature data curve graph under closed environment in the utility model embodiment.
Specific embodiment
Embodiment 1
As shown in Fig. 2, a kind of structural schematic diagram of passive wireless temperature sensor for the utility model；
A kind of passive wireless temperature sensor of the present embodiment includes microwave antenna, signal receiving antenna, RF energy
Collection module, protective module, power management module, modulation /demodulation module, data management module, temperature measurement module, external sensor
Module, wireless transmitter module, wireless energy transmission module, receiving module, signal transmitting antenna, microwave transmitting antenna, auxiliary electricity
Source.The input terminal of the output termination RF energy collection module of microwave antenna；The output of RF energy collection module terminates
The input terminal of protective module and power management module；The input terminal of the output termination modulation /demodulation module of protective module；Power supply pipe
Manage the input terminal of the output termination temperature measurement module of module and one end of enabled switch；The output terminating data pipe of modulation /demodulation module
Manage the input terminal of module；The input terminal of the output termination power management module of data management module；The output of temperature measurement module terminates
Wireless transmitter module；The output termination data management module of external sensor module and the enable end of enabled switch；Wireless transmission
One end that the enabled switch of input termination of module is connected with power management module output end；Signal transmitting antenna connects wireless transmission
The output end of module；Accessory power supply connects power management module.
As shown in figure 3, the wireless energy transmission module includes the microwave signal generator of Agilent, capacitor C1, C2
With C3, triode, microwave transmitting antenna；Microwave generator passes through the connection of the base stage of capacitor C1 and triode, the current collection of triode
Pole is connected with antenna one end by capacitor, and the emitter of the other end of microwave transmitting antenna and triode, microwave generator are born
Pole ground connection.
As shown in figure 4, the RF energy collection module, including microwave antenna, electromagnetic coil, automatic impedance matching
Circuit, self-adapted commutation circuit；Electromagnetic wave in space is converted to alternating current by electromagnetic induction principle by microwave antenna,
Alternating current provides DC voltage by exporting direct current after self-adapted commutation circuit rectification variation for the circuit in environment to be measured；From
Rectification circuit series, automatic impedance matching circuit can also be adjusted according to the power level of external radio-frequency signal by adapting to rectification circuit
Impedance matching is carried out according to the variation of series；RF energy collection module breaks for capturing electromagnetism in space and is converted into electricity
Energy can be provided for the circuit in environment to be measured；Particularly microwave antenna receives the wavelet transform in space, microwave
Transformation the magnetic field around electromagnetic coil can be caused to convert, magnetic field transformation after electric current can be generated on electromagnetic coil, pass through
A stable electric current can be exported after rectifier circuit rectifies, size of current is 500 μ A, generates a volume by current-limiting circuit
Constant voltage output voltage Vout, voltage swing 2V；It can power for other circuits, to assist power source charges.
As shown in figure 5, it includes the first Schottky diode D that the Schottky diode of the temperature measurement module, which adopts circuit temperature,1
With the second Schottky diode D2, the first operational amplifier A1, second operational amplifier A2With constitute circuit metal-oxide-semiconductor and inductance,
And with the second Schottky diode D2Concatenated resistance R1, the first Schottky diode D1With the first operational amplifier A1One
End connection, the first operational amplifier A1The other end respectively with the second Schottky diode D2Anode, second operational amplifier A2
Input be connected；First operational amplifier A1Output voltage be V2, second operational amplifier A2Output voltage be V1, survey
The metal-oxide-semiconductor M of warm module2Drain electrode electric current be one variation electric current Iptat, metal-oxide-semiconductor M1Drain electrode electric current be one reference
Electric current, Schottky diode adopt circuit temperature and use various sizes of Schottky diode as adopting warm element, the first Schottky two
Pole pipe D1With the second Schottky diode D2Between voltage difference generate a PTAT voltage analog, the electric current I of outputptat
The calculation formula of size is formula (1):
Wherein k is Boltzmann constant, and T is temperature, and N is the first Schottky diode D1With the second Schottky diode D2
Junction area ratio, q is electronic charge, and R is resistance R1Resistance value；First Schottky diode D1With the second Schottky diode
D2Respectively in given bias current IDUnder, the first Schottky diode D1With the second Schottky diode D2Both ends generate respectively
One voltage drop VD, the calculation formula of size is formula (2):
Wherein, RsFor the first Schottky diode D1With the second Schottky diode D2Corresponding equivalent resistance, IsIt is first
Schottky diode D1With the second Schottky diode D2Corresponding saturation current.
The A/D converter circuit of the temperature collecting module is as shown in fig. 6, as shown in fig. 7, the AD conversion circuit
Input voltage is the output voltage V of temperature collecting module2, export as a square-wave signal corresponding with temperature.
As shown in figure 8, the receiving module includes that signal receives electric wire, inductance, diode, capacitor, operational amplifier；
Signal receiving antenna is connect by inductance with operational amplifier.
The microwave antenna of RF energy collection module can receive the microwave of wireless energy transmission module transmitting, microwave
The reception frequency range of receiving antenna is 13.56MHz, after the coil of RF energy collection module experiences the variation of microwave, can generate
One electric current exports a voltage V from the output end of energy collection moduleout, which is the fast Schottky two of thermometric mould for it
Pole pipe adopts circuit temperature, A/D converter circuit, transmitting module power supply, and temperature measurement module Schottky diode adopts the V of circuit temperatureDDWith radio frequency energy
Measure the V of collection moduleoutIt is connected；The V of A/D converter circuitDDWith the V of RF energy collection moduleoutIt is connected；Transmitting module
VccWith the V of energy collection moduleoutIt is connected.
The input terminal of transmitting module is connected with the output end for the A/D converter circuit for adopting warm module, the output of A/D converter circuit
The square-wave signal that end generates passes through transmitting module, is sent the corresponding square-wave signal of collected temperature by signal transmitting antenna
It goes out；The signal that transmitting module is emitted, signal receiving antenna can be received far from the receiving module at environment to be measured
Reception frequency be 935.6MHz。
In the utility model, system is powered using RF energy, and extraneous microwave signal is faint for a long time in order to prevent causes
System can not work normally, and be connect using accessory power supply with system.When microwave signal input power is larger, system uses microwave
Signal energy supply, extra electricity provide battery charging, on the contrary it is then using battery functi on.
In the utility model, when microwave antenna receives microwave signal, RF energy collecting circuit can will be connect
The microwave signal received is converted to direct current signal, and has boosting.Since microwave signal intensity is indefinite, in order to improve effect
Rate uses self-adapted commutation circuit in RF energy collecting circuit, selects rectification circuit series according to microwave signal input power,
Impedance auto-match circuit carries out impedance matching, maximizes efficiency.According to the power of microwave signal, electric power selection apparatus selection electricity
Pool mode or Passive Mode.
In order to preferably reduce power consumption, the external sensor module includes chopper amplifier, multiplexer, may be programmed
Gain amplifier, successive approximation register converter.Chopper amplifier inhibits 1/f noise for promoting external signal
And offset voltage；Multiplexer is for receiving multiple external sensor signals；Programmable gain amplifier is to adjustment signal
It is supplied to the signal amplitude of the suitable input range of converter；Successive approximation register converter is used to realize medium turn
Change rate and low-power consumption；Entire external sensor module makes system enter the shapes such as suspend mode, wake-up, holding for receiving external command
State.
The protective module uses RF limiter, for limiting improper high input power, protects internal components.
The temperature measurement module uses SiC Schottky diode, compared with common pn-junction diode, SiC Schottky diode
Have the characteristics that high temperature resistant, high pressure, high frequency；In the section 300K-400K, there is significant temperature sensitivity.
Embodiment two
The present embodiment simulates a kind of confined space environment using climatic chamber, using passive and wireless described in embodiment one
Temperature sensor carries out temperature acquisition, and collection process and result are as follows:
By the RF energy collection module of the utility model, protective module, power management module, modulation /demodulation module, number
It is arranged in climatic chamber according to management module, temperature measurement module, external sensor module, wireless transmitter module, accessory power supply, it is permanent
It is a closed environment inside constant temperature and humidity case, the temperature change section that climatic chamber is arranged is 45-100 DEG C, transformation period
For 15min, it is 45% that humidity, which is arranged, and wireless energy transmission module is arranged far from climatic chamber 60CM, and outside receives mould
Block is arranged far from climatic chamber 10M, and the temperature in climatic chamber is raised to 100 degrees Celsius from 40 degrees Celsius, when test
Between 15 minutes, the temperature data measured is as shown in table 1, and it is as shown in Fig. 10 to measure temperature changing trend；
Table 1: passive wireless temperature sensor acquires tables of data in climatic chamber
| Time/min | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| Temperature/DEG C | 45 | 50 | 55 | 59 | 64 | 68 | 70 | 76 | 81 | 84 | 88 | 91 | 94 | 97 |
The actual temperature and the delta data of time such as table 2 in climatic chamber that temp.-sensing wire in climatic chamber returns
Shown, temperature changing trend is as shown in figure 11；
Table 2: actual temperature data table in climatic chamber
| Time/min | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| Temperature/DEG C | 45 | 50 | 55 | 61 | 66 | 70 | 75 | 79 | 85 | 90 | 92 | 95 | 97 | 99 |
By Tables 1 and 2 it is found that in the present embodiment, measured using passive wireless temperature sensor provided by the utility model
Temperature measurement result be consistent with actual temperature change trend, solve the difficulty being routed in closed environment, embody nothing
The application value of source wireless sensor.
Although the utility model has been described by way of example and in terms of the preferred embodiments, it is not intended to limit the utility model, any
Person skilled in the art can do various change and modification, therefore this without departing from the spirit and scope of the utility model
The protection scope of utility model should subject to the definition of the claims.
Claims (9)
1. a kind of passive wireless temperature sensor, which is characterized in that including receiving antenna, RF energy collection module, protection mould
Block, power management module, modulation /demodulation module, data management module, temperature measurement module, external sensor module, wireless transmission mould
Block, transmitting antenna, accessory power supply, wireless energy transmission module, external receiving module；
The transmitting antenna includes the signal transmitting antenna of wireless transmitter module and the Microwave emission of wireless energy transmission module
Antenna；The receiving antenna includes the signal receiving antenna of external receiving module and the microwave receiving of RF energy collection module
Antenna.
2. a kind of passive wireless temperature sensor according to claim 1, which is characterized in that the RF energy is collected
Module, protective module, power management module, modulation /demodulation module, data management module, temperature measurement module, external sensor module,
Wireless transmitter module, accessory power supply are arranged in environment to be measured；The wireless energy transmission module, external receiving module setting
Far from environment to be measured.
3. a kind of passive wireless temperature sensor according to claim 1, which is characterized in that the temperature measurement module, including
Schottky diode adopts circuit temperature, A/D converter circuit；Schottky diode, which adopts circuit temperature, can acquire temperature in environment to be measured；
Analog voltage signal can be converted to digital signal and pass to wireless sending module by A/D converter circuit.
4. a kind of passive wireless temperature sensor according to claim 3, which is characterized in that the Schottky diode
Adopting circuit temperature includes the first Schottky diode and the second Schottky diode, the first operational amplifier, second operational amplifier
With the metal-oxide-semiconductor and inductance and the concatenated resistance R of the second Schottky diode for constituting circuit1, the first Schottky diode and first
One end of operational amplifier connects, the other end of the first operational amplifier respectively with the anode of the second Schottky diode, second
The input of operational amplifier is connected；The output voltage of first operational amplifier is V2, the output voltage of second operational amplifier
For V1, the metal-oxide-semiconductor M of temperature measurement module2Drain electrode electric current be one variation electric current Iptat, metal-oxide-semiconductor M1Drain electrode electric current be one
A reference current I1, the voltage difference between the first Schottky diode and the second Schottky diode can generate a PTAT's
Voltage analog, the electric current I of outputptatThe calculation formula of size is formula (1):
Wherein k is Boltzmann constant, and T is temperature, and N is the junction area of the second Schottky diode and the first Schottky diode
Than q is electronic charge, and R is resistance R1Resistance value；First Schottky diode and the second Schottky diode are respectively given
Bias current IDUnder, the first Schottky diode and the second Schottky diode both ends generate a voltage drop V respectivelyD, big
Small calculation formula is formula (2):
Wherein, RsFor the first Schottky diode equivalent resistance corresponding with the second Schottky diode, IsFor the first Schottky two
Pole pipe and the corresponding saturation current of the second Schottky diode；η is Diode Ideality Factor.
5. a kind of passive wireless temperature sensor according to claim 1, which is characterized in that the wireless energy transmission
Module includes microwave generator, capacitor, triode, microwave transmitting antenna；Microwave generator passes through the base stage of capacitor and triode
It connects, the collector of triode is connected by capacitor with microwave transmitting antenna one end, the other end of microwave transmitting antenna and three poles
The emitter of pipe, the cathode of microwave generator are grounded.
6. a kind of passive wireless temperature sensor according to claim 1, which is characterized in that the microwave antenna
Output termination RF energy collection module input terminal；The output termination protective module and power supply pipe of RF energy collection module
Manage the input terminal of module；The input terminal of the output termination modulation /demodulation module of protective module；The output of power management module terminates
One end of the input terminal of temperature measurement module and enabled switch；The input terminal of the output termination data management module of modulation /demodulation module；
The input terminal of the output termination power management module of data management module；The output of temperature measurement module terminates wireless transmitter module；Outside
The output termination data management module of portion's sensor module and the enable end of enabled switch；The input termination of wireless transmitter module makes
The one end being connected with power management module output end can be switched；Signal transmitting antenna connects the output end of wireless transmitter module；It is auxiliary
Power supply is helped to connect power management module.
7. a kind of passive wireless temperature sensor according to claim 1, which is characterized in that the RF energy collects mould
Block, including microwave antenna, electromagnetic coil, automatic impedance matching circuit, self-adapted commutation circuit；Microwave antenna passes through
Electromagnetic wave in space is converted to alternating current by electromagnetic induction principle, and alternating current passes through defeated after self-adapted commutation circuit rectification variation
Direct current provides DC voltage for the circuit in environment to be measured out；Self-adapted commutation circuit can be according to the function of external radio-frequency signal
Rate intensity adjustment rectification circuit series, automatic impedance matching circuit carry out impedance matching according to the variation of series；RF energy is received
Collection module, which is used to capture electromagnetism in space to break and be converted into electric energy, provides energy for the circuit in environment to be measured.
8. a kind of passive wireless temperature sensor according to claim 1, which is characterized in that the wireless transmitter module
Input be adopt warm module A/D converter circuit output temperature square wave data, the signal transmitting antenna of wireless transmitter module can
The temperature square wave data transmitting of acquisition is transferred to external receiving module.
9. a kind of passive wireless temperature sensor according to claim 4, which is characterized in that first Schottky two
Pole pipe and the anode metal material of the second Schottky diode are any one in aluminium, gold, molybdenum, nickel and titanium, semiconductor material
For any one in Si, GaN, diamond, SiC.
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| CN2017112898387 | 2017-12-08 | ||
| CN201711289838.7A CN107817055A (en) | 2017-12-08 | 2017-12-08 | A kind of passive wireless temperature sensor |
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| CN209689769U true CN209689769U (en) | 2019-11-26 |
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| CN201711289838.7A Pending CN107817055A (en) | 2017-12-08 | 2017-12-08 | A kind of passive wireless temperature sensor |
| CN201811465904.6A Pending CN109443576A (en) | 2017-12-08 | 2018-12-03 | A kind of passive wireless temperature sensor |
| CN201822020509.9U Expired - Fee Related CN209689769U (en) | 2017-12-08 | 2018-12-03 | A kind of passive wireless temperature sensor |
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| CN201711289838.7A Pending CN107817055A (en) | 2017-12-08 | 2017-12-08 | A kind of passive wireless temperature sensor |
| CN201811465904.6A Pending CN109443576A (en) | 2017-12-08 | 2018-12-03 | A kind of passive wireless temperature sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443576A (en) * | 2017-12-08 | 2019-03-08 | 江南大学 | A kind of passive wireless temperature sensor |
| CN111105608A (en) * | 2019-12-30 | 2020-05-05 | 广东工业大学 | Wireless control system and wireless control method for realizing power supply on-off operation of equipment |
| CN113155306A (en) * | 2021-01-18 | 2021-07-23 | 国网吉林省电力有限公司长春供电公司 | Built-in passive wireless temperature sensor for high-voltage power cable connector |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111103068A (en) * | 2018-10-26 | 2020-05-05 | 泰科电子(上海)有限公司 | Temperature detector and temperature detection system |
| CN111103069A (en) * | 2018-10-26 | 2020-05-05 | 泰科电子(上海)有限公司 | Temperature detector and temperature detection system |
| CN111649833A (en) * | 2020-05-15 | 2020-09-11 | 国网福建省电力有限公司三明供电公司 | Passive wireless temperature sensor |
| CN112271832A (en) * | 2020-09-27 | 2021-01-26 | 北京智芯微电子科技有限公司 | Power supply device, power equipment sensor and power system |
| CN115733522B (en) * | 2022-11-18 | 2024-08-06 | 大连理工大学 | Zero-power-consumption high-gain long-distance sensing tag based on energy collection |
| CN115655515B (en) * | 2022-12-07 | 2023-03-14 | 四川赛康智能科技股份有限公司 | High-voltage switch cabinet online temperature measurement system based on energy information integrated transmission technology |
| CN118326354B (en) * | 2024-04-23 | 2024-09-17 | 华南理工大学 | Wireless self-powered device, wireless temperature measurement system and wireless temperature measurement method |
| CN118433575A (en) * | 2024-07-01 | 2024-08-02 | 广东电网有限责任公司广州供电局 | Multi-cavity radio frequency energizing and temperature signal converter and temperature measuring system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122786A (en) * | 2007-08-29 | 2008-02-13 | 东南大学 | Wireless multiple parameter on-line environment monitor |
| CN204103869U (en) * | 2014-10-17 | 2015-01-14 | 李永钦 | The high-frequency amplifier that a kind of power consumption is low |
| CN107817055A (en) * | 2017-12-08 | 2018-03-20 | 江南大学 | A kind of passive wireless temperature sensor |
-
2017
- 2017-12-08 CN CN201711289838.7A patent/CN107817055A/en active Pending
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2018
- 2018-12-03 CN CN201811465904.6A patent/CN109443576A/en active Pending
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443576A (en) * | 2017-12-08 | 2019-03-08 | 江南大学 | A kind of passive wireless temperature sensor |
| CN111105608A (en) * | 2019-12-30 | 2020-05-05 | 广东工业大学 | Wireless control system and wireless control method for realizing power supply on-off operation of equipment |
| CN113155306A (en) * | 2021-01-18 | 2021-07-23 | 国网吉林省电力有限公司长春供电公司 | Built-in passive wireless temperature sensor for high-voltage power cable connector |
| CN113155306B (en) * | 2021-01-18 | 2023-11-10 | 国网吉林省电力有限公司长春供电公司 | Built-in passive wireless temperature-sensing sensor of high-voltage power cable joint |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109443576A (en) | 2019-03-08 |
| CN107817055A (en) | 2018-03-20 |
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