CN203069289U - Temperature monitoring system based on wireless passive RF Technology - Google Patents
Temperature monitoring system based on wireless passive RF Technology Download PDFInfo
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- CN203069289U CN203069289U CN 201320060293 CN201320060293U CN203069289U CN 203069289 U CN203069289 U CN 203069289U CN 201320060293 CN201320060293 CN 201320060293 CN 201320060293 U CN201320060293 U CN 201320060293U CN 203069289 U CN203069289 U CN 203069289U
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Abstract
The utility model relates to a temperature monitoring system based on a wireless passive RF technology. The temperature monitoring system comprises an antenna end, an RF analog front end, a sensor interface, a temperature sensor and a digital module, wherein the sensor interface is respectively connected with the temperature sensor and the digital module; the temperature sensor is a thermistor, the sensor interface comprises a first RC oscillator, a second RC oscillator, a counter and a controller, the thermistor is the oscillation resistor of the first RC oscillator, the controller is respectively connected with the first RC oscillator and the second RC oscillator, oscillation output ends of the first RC oscillator and the second RC oscillator are respectively connected with the counter, and the controller and the counter are respectively connected with the digital module. The temperature monitoring system adopts the thermistor to complete the conversion from temperature measurement changes to resistance value changes, adopts the simple sensor interface to convert the resistance value changes into time changing signals and convert the time changing signals into digital signals, avoids the application of traditional analog-digital converter, and reduces power consumption.
Description
Technical field
The utility model relates to the monitoring temperature technical field based on REID, relates in particular to a kind of temperature monitoring system based on the wireless and passive radio-frequency technique.
Background technology
Along with the increase day by day of social power consumption, carrying electrical loads such as the high voltage electric equipment of big load conveying task such as transformer, mutual inductor, high-tension switch cabinet, outdoor disconnecting link and also increasing sharply.Interface in the electrical network between numerous high voltage electric equipments itself, the equipment is that electric power is carried weakest link, and the substantive issue of this weak link is exactly the interface heating.Along with the increase of load, cause the interface heating and form vicious cycle: temperature rise, expansion, contraction, oxidation, resistance increase, heat up until leading to a disaster once again.Therefore, the temperature rise of monitoring high-tension apparatus interface is to stop the key that this type of accident takes place, and realizes that on-line temperature monitoring is the important means that guarantees the high-tension apparatus safe operation.
For a long time, the interface running temperature of high-tension apparatus is difficult to real time on-line monitoring, because these positions all have exposed high pressure, also some is confined space, and common thermometry can't be used because solving the High-Voltage Insulation problem.The temperature-sensing system of Shi Yonging comprises fibre optic temperature sensor, infrared measurement of temperature and wireless temperature measurement system etc. in the market, fibre optic temperature sensor adopts the fiber optic transmission temperature signal, fibre-optic insulativity height, high pressure in can isolating switch cabinet, but optical fiber surface is vulnerable to pollute, and can cause optical fiber along the discharge of face.Infrared measurement of temperature is contactless temperature-measuring, but very easily be subjected to ambient dust and around electromagnetic field effects, easily hide infrared temperature measuring head as dust etc., cause the inaccurate and situation of wrong report of temperature detection, space in the switch cubicle is very narrow and small in addition, and infrared temperature probe can't be installed.Wireless temperature measurement system is not subjected to the restriction of switch cubicle body structure, and sensor can be directly installed on the high-tension apparatus, and temperature survey is accurate, can thoroughly solve the electric insulation problem, and is not subjected to the influence of environment, can measuring chamber the temperature of inside and outside any high-voltage charged body.Yet at present domestic radio temperature sensor uses lithium battery, and it has a lot of hidden danger, and as battery life, cell degradation causes short circuit, and the resistance to elevated temperatures of battery, can not satisfy the needs of the real-time monitoring of temperature now.
Summary of the invention
Technical problem to be solved in the utility model is the problems referred to above that exist when detecting at existing wireless temperature sensing and monitoring system, and a kind of low-power consumption, the high-level efficiency temperature monitoring system based on the wireless and passive radio-frequency technique is provided.
For addressing the above problem, the technical solution of the utility model is:
A kind of temperature monitoring system based on the wireless and passive radio-frequency technique, comprise for the antenna end that connects transmitting base station, be used for demodulation or modulation signal and the radio frequency energy that antenna end is sensed converted to the rf analog front-end of electric energy, temperature sensor and be used for storage and handle the digital module of numerical information, rf analog front-end respectively with antenna end, digital module links to each other with temperature sensor, in order to power supply and signal sequence to be provided, described temperature monitoring system also comprise for the simulating signal of temperature sensor transmission is carried out analog to digital conversion and will change after digital signal send the sensor interface of digital module to, the sensor interface links to each other with digital module with temperature sensor respectively, and rf analog front-end provides power supply and signal sequence for the sensor interface; Described temperature sensor is thermal resistance, the sensor interface comprises a RC oscillator, the 2nd RC oscillator, counter and controller, thermal resistance is the oscillation resistance of a RC oscillator, controller links to each other with the 2nd RC oscillator with a RC oscillator respectively, the oscillation output end of the one RC oscillator and the 2nd RC oscillator links to each other with counter respectively, the controller sum counter links to each other with digital module respectively, the oscillator signal that counter receives and counting is exported by a RC oscillator and the 2nd RC oscillator, the count value of digital module count pick up device output.
Temperature monitoring system is made up of antenna end, rf analog front-end, digital module, temperature sensor and sensor interface, antenna end is for received RF information from transmitting base station and send rf analog front-end to, and the temperature detection information that digital module is real-time is transmitted on the transmitting base station.The radio frequency energy that rf analog front-end is used for antenna end is sensed converts electric energy to, and is supplied to digital module, temperature sensor and sensor interface, and being used for provides clock signal to digital module and temperature sensor; Be used for the radiofrequency signal that demodulation is transmitted by antenna end simultaneously, and the data-signal that digital module sends is modulated, make things convenient for real time temperature to detect the transmission of information, digital module is used for the work at control temperature sensor and sensor interface.Temperature sensor is directly installed on the high-tension apparatus, and temperature sensor is for detection of temperature, and converts temperature variation to resistance value and send to the sensor interface.The sensor interface is used for converting resistance value to isarithmic time signal by a RC oscillator and the 2nd RC oscillator, and by counter and controller output digital count value in digital module, by digital module storage and processing, and send on the rf analog front-end.
Be compared to prior art, temperature monitoring system based on the wireless and passive radio-frequency technique of the present utility model adopts thermal resistance to finish the transformation that temperature detection changes to resistance change, adopting the simple sensors interface to make the change transitions of resistance value is time-varying signal, and time-varying signal changed into digital signal, avoided using traditional analog to digital converter, the volume of system is reduced greatly, reduced power consumption again simultaneously, have the characteristics of real-time high-efficiency detection, long service life.
Preferably; described thermal resistance comprises substrate layer, metal film layer and protective seam from down to up successively; substrate layer is a kind of in stupalith substrate layer, glass material substrate layer, silicon materials substrate layer and the sapphire material substrate layer; metal film layer is a kind of in copper film layer, nickel thin layer and the platinum film layer, and protective seam is a kind of in epoxy resin protective seam and the glassivation.Said temperature sensor measurement precision height, high temperature resistant, the preparation that is highly suitable in the hot environment detects.
Preferably, the thickness of described metal film layer is the 1-10 nanometer.
Preferably, described sensor interface also comprises multiplier, the oscillation output end of the 2nd RC oscillator links to each other with the input end of multiplier, the oscillation output end of the one RC oscillator links to each other with the input end of multiplier by behind the controller, the output terminal of multiplier links to each other with counter, the resistance of the 2nd RC oscillator and electric capacity are definite value, and the electric capacity of a RC oscillator is definite value, and the oscillation frequency of the 2nd RC oscillator is higher than the oscillation frequency of a RC oscillator.Adopting the simple sensors interface to make the change transitions of resistance value is time-varying signal, and time-varying signal is changed into digital signal, has avoided using traditional analog to digital converter, and the volume of system is reduced greatly, has reduced power consumption simultaneously again.
Preferably, described rf analog front-end comprises modulation demodulation system and the energy collecting system that is attached thereto, modulation demodulation system is provided with ASK detuner and backreflection modulator, the radio-frequency (RF) energy that ASK detuner demodulation antenna end is sensed is in energy collecting system, the temperature monitoring data that the backreflection modulator receives and the modulation digital module is exported, the temperature monitoring data are sent by antenna end; Energy collecting system comprises voltage frequency multiplier, voltage sensor, voltage limitator and power supply reset circuit, the voltage frequency multiplier links to each other with the output terminal of ASK detuner, the output terminal of voltage frequency multiplier links to each other with voltage sensor, voltage limitator successively, voltage sensor links to each other with the power supply reset circuit, and the output terminal of voltage limitator and power supply reset circuit links to each other with digital module.The energy shortage that antenna end receives in the native system makes the DC voltage of induction be amplified to enough driving chip operations under the effect of voltage frequency multiplier with drive system work, can reduce the energy of importing so greatly.
Preferably, described digital module comprises DLC (digital logic circuit) and the EEPROM (Electrically Erasable Programmable Read Only Memo) that is attached thereto, and DLC (digital logic circuit) links to each other with the controller sum counter at sensor interface, and the transmission of DLC (digital logic circuit) is based on EPCGen2 communication protocol.
Description of drawings
Fig. 1 is that the utility model is based on the module principle block diagram of the temperature monitoring system of wireless and passive radio-frequency technique.
Fig. 2 is that the utility model is based on the theory diagram of the temperature monitoring system of wireless and passive radio-frequency technique.
Fig. 3 is that the utility model is based on the theory diagram of rf analog front-end in the temperature monitoring system of wireless and passive radio-frequency technique.
Embodiment
Further describe the utility model below in conjunction with drawings and Examples, but protection domain of the present utility model is not limited to this.
With reference to Fig. 1, temperature monitoring system based on the wireless and passive radio-frequency technique of the present utility model comprises antenna end, rf analog front-end, digital module, temperature sensor and sensor interface, antenna end links to each other with rf analog front-end, rf analog front-end links to each other with digital module with temperature sensor respectively, digital module links to each other with the sensor interface, and temperature sensor links to each other with the sensor interface.
The temperature sensor that the utility model adopts is passive device, and its required energy can provide by various forms such as heat energy, concussion, mechanical motion and sun power, adopts the mode of electromagnetic induction to provide energy to system in the utility model.Temperature sensor is directly installed on the high-tension apparatus, temperature sensor is thermal resistance, the resistance of thermal resistance changes along with the change of temperature, and temperature sensor converts temperature variation to resistance value and sends to the sensor interface, finishes the transformation that temperature detection changes to resistance change.Thermal resistance comprises substrate layer, metal film layer and protective seam from down to up successively; substrate layer is a kind of in stupalith substrate layer, glass material substrate layer, silicon materials substrate layer and the sapphire material substrate layer, and protective seam is a kind of in epoxy resin protective seam and the glassivation.Metal film layer is a kind of in copper film layer, nickel thin layer and the platinum film layer, in other words be the metal material of repeatable resistance and temperature relation, metal film layer forms in the substrate layer deposition, the thickness of metal film layer is the 1-10 nanometer, and the detected temperatures of this temperature sensor can reach 300 degrees centigrade.
Antenna end is for received RF information from transmitting base station and send rf analog front-end to, again temperature detection information real-time on the digital module, temperature sensor address and numbering etc. are transmitted on the transmitting base station by communication protocol, transmitting base station is as realizing that with the radio-frequency (RF) identification code reader radio-frequency (RF) identification code reader provides energy can for a plurality of passive temperature monitoring systems.Transmitting base station links to each other with the control center of intelligent grid by the Internet, realizes on-line real time monitoring.Antenna end receives the radiofrequency signal of transmitting base station emission, radiofrequency signal provides energy by rectification and amplification to system, the DC voltage of antenna end induction generally is not enough to the circuit of actuation temperature monitoring system, is directly used in traditional energy with receiving that to drive chip different.
With reference to Fig. 2-3, rf analog front-end comprises modulation demodulation system and the energy collecting system that is attached thereto, modulation demodulation system is used for the radiofrequency signal that demodulation is transmitted by antenna end, and the data-signal that digital module sends is modulated, and makes things convenient for real time temperature to detect the transmission of information.The radio frequency energy that energy collecting system is used for antenna end is sensed converts electric energy to, and is supplied to digital module, temperature sensor and sensor interface, and being used for provides clock signal to digital module and temperature sensor.Modulation demodulation system is provided with ASK detuner and backreflection modulator, the radio-frequency (RF) energy that ASK detuner demodulation antenna end is sensed is in energy collecting system, the temperature monitoring data that the backreflection modulator receives and the modulation digital module is exported, the temperature monitoring data are sent by antenna end.Energy collecting system comprises voltage frequency multiplier, voltage sensor, voltage limitator and power supply reset circuit, the voltage frequency multiplier links to each other with the output terminal of ASK detuner, the output terminal of voltage frequency multiplier links to each other with voltage sensor, voltage limitator successively, voltage sensor links to each other with the power supply reset circuit, and the output terminal of voltage limitator and power supply reset circuit links to each other with digital module.The energy shortage that antenna end receives in the native system is with drive system work, the prime of voltage frequency multiplier is established the voltage commutation device, voltage commutation device and voltage frequency multiplier are amplified to enough driving chips with the DC voltage that produces, and have so just significantly reduced the input energy that needs.Voltage limitator keeps output voltage less than voltage breakdown, is used for the protection of system, and the voltage frequency multiplier adopts improved DICKSON voltage multiplier, and it comprises that level Four is amplified and presses schottky diode to form by low barrier.
Digital module is used for the work at control temperature sensor and sensor interface, and storage and processing numerical information.Digital module comprises DLC (digital logic circuit) and the EEPROM (Electrically Erasable Programmable Read Only Memo) that is attached thereto, in Fig. 2, be labeled as storer, DLC (digital logic circuit) links to each other with the controller sum counter at sensor interface, and the transmission of DLC (digital logic circuit) is based on EPCGen2 communication protocol.After the coherent signal in the system is stable, DLC (digital logic circuit) is just started working and is instructed from the base station reception, the instruction that deciphering is received also brings into operation, it is sent to temperature sensor and sensor interface with instruction, and in time storage temperature sensor identity information and real time temperature data are in EEPROM (Electrically Erasable Programmable Read Only Memo), and related data is just by modulation and by the antenna end wireless transmission.
With reference to Fig. 2, the sensor interface is used for sending the digital signal that the simulating signal of temperature sensor transmission will be carried out after analog to digital conversion also will be changed to digital module, be specially and convert resistance value to isarithmic time signal by a RC oscillator and the 2nd RC oscillator, and by counter and controller output digital count value in digital module, by digital module storage and processing, and send on the rf analog front-end.
The sensor interface comprises a RC oscillator, the 2nd RC oscillator, multiplier, counter and controller, thermal resistance is the oscillation resistance of a RC oscillator, controller links to each other with the 2nd RC oscillator with a RC oscillator respectively, the oscillation output end of the 2nd RC oscillator links to each other with the input end of multiplier, the oscillation output end of the one RC oscillator links to each other with the input end of multiplier by behind the controller, the output terminal of multiplier links to each other with counter, the resistance of the 2nd RC oscillator and electric capacity are definite value, the electric capacity of the one RC oscillator is definite value, the oscillation frequency of the 2nd RC oscillator is higher than the oscillation frequency of a RC oscillator, namely a RC oscillator is LF oscillator, the 2nd RC oscillator is high frequency oscillator, be definite value the oscillation period of the 2nd RC oscillator, and vary with temperature and change the oscillation period of a RC oscillator.The controller sum counter links to each other with DLC (digital logic circuit) in the digital module respectively, and counter calculates the global oscillation number of times of LF oscillator when a high position, the count value of digital module count pick up device output.Count value according to digital module obtains reaches the relation between resistance value and temperature, resistance value and the oscillation frequency, can obtain the temperature value of current detection.Adopting the simple sensors interface to make the change transitions of resistance value is time-varying signal, and time-varying signal changed into digital signal, avoided using traditional analog to digital converter, the volume of system is reduced greatly, simultaneously reduce power consumption again, had the characteristics of real-time high-efficiency detection, long service life.
The utility model is when work, received the radiofrequency signal of transmitting base station by antenna end, radiofrequency signal at first enters demodulation in the ASK detuner, outputting data signals is in energy collecting system after the demodulation, DLC (digital logic circuit) obtains the instruction of transmitting base station, start working in control temperature sensor and sensor interface, simultaneously, energy collecting system is given system's various piece power supply and clock signal is provided; Temperature sensor is according to current temperature value, the resistance value that output is corresponding, and determined the oscillation frequency of a RC oscillator, reference frequency by the 2nd RC oscillator, the current count value of counter output is incorporated in the DLC (digital logic circuit), DLC (digital logic circuit) is controlled and this value storage is preserved in EEPROM (Electrically Erasable Programmable Read Only Memo), when numerical value that numerical value arrival system need send, by DLC (digital logic circuit) control EEPROM (Electrically Erasable Programmable Read Only Memo) numerical value is transported in the backreflection modulator, makes this signal meet the antenna end transmission.
In the above-mentioned explanation, all special instructions that do not add all adopt routine techniques means of the prior art.
Claims (6)
1. temperature monitoring system based on the wireless and passive radio-frequency technique, comprise for the antenna end that connects transmitting base station, be used for demodulation or modulation signal and the radio frequency energy that antenna end is sensed converted to the rf analog front-end of electric energy, temperature sensor and be used for storage and handle the digital module of numerical information, rf analog front-end respectively with antenna end, digital module links to each other with temperature sensor, in order to power supply and signal sequence to be provided, it is characterized in that, described temperature monitoring system also comprise for the simulating signal of temperature sensor transmission is carried out analog to digital conversion and will change after digital signal send the sensor interface of digital module to, the sensor interface links to each other with digital module with temperature sensor respectively, and rf analog front-end provides power supply and signal sequence for the sensor interface;
Described temperature sensor is thermal resistance, the sensor interface comprises a RC oscillator, the 2nd RC oscillator, counter and controller, thermal resistance is the oscillation resistance of a RC oscillator, controller links to each other with the 2nd RC oscillator with a RC oscillator respectively, the oscillation output end of the one RC oscillator and the 2nd RC oscillator links to each other with counter respectively, the controller sum counter links to each other with digital module respectively, the oscillator signal that counter receives and counting is exported by a RC oscillator and the 2nd RC oscillator, the count value of digital module count pick up device output.
2. the temperature monitoring system based on the wireless and passive radio-frequency technique according to claim 1; it is characterized in that; described thermal resistance comprises substrate layer, metal film layer and protective seam from down to up successively; substrate layer is a kind of in stupalith substrate layer, glass material substrate layer, silicon materials substrate layer and the sapphire material substrate layer; metal film layer is a kind of in copper film layer, nickel thin layer and the platinum film layer, and protective seam is a kind of in epoxy resin protective seam and the glassivation.
3. the temperature monitoring system based on the wireless and passive radio-frequency technique according to claim 2 is characterized in that, the thickness of described metal film layer is the 1-10 nanometer.
4. the temperature monitoring system based on the wireless and passive radio-frequency technique according to claim 1, it is characterized in that, described sensor interface also comprises multiplier, the oscillation output end of the 2nd RC oscillator links to each other with the input end of multiplier, the oscillation output end of the one RC oscillator links to each other with the input end of multiplier by behind the controller, the output terminal of multiplier links to each other with counter, the resistance of the 2nd RC oscillator and electric capacity are definite value, the electric capacity of the one RC oscillator is definite value, and the oscillation frequency of the 2nd RC oscillator is higher than the oscillation frequency of a RC oscillator.
5. the temperature monitoring system based on the wireless and passive radio-frequency technique according to claim 1, it is characterized in that, described rf analog front-end comprises modulation demodulation system and the energy collecting system that is attached thereto, modulation demodulation system is provided with ASK detuner and backreflection modulator, the radio-frequency (RF) energy that ASK detuner demodulation antenna end is sensed is in energy collecting system, the temperature monitoring data that the backreflection modulator receives and the modulation digital module is exported, the temperature monitoring data are sent by antenna end; Energy collecting system comprises voltage frequency multiplier, voltage sensor, voltage limitator and power supply reset circuit, the voltage frequency multiplier links to each other with the output terminal of ASK detuner, the output terminal of voltage frequency multiplier links to each other with voltage sensor, voltage limitator successively, voltage sensor links to each other with the power supply reset circuit, and the output terminal of voltage limitator and power supply reset circuit links to each other with digital module.
6. the temperature monitoring system based on the wireless and passive radio-frequency technique according to claim 1, it is characterized in that, described digital module comprises DLC (digital logic circuit) and the EEPROM (Electrically Erasable Programmable Read Only Memo) that is attached thereto, DLC (digital logic circuit) links to each other with the controller sum counter at sensor interface, and the transmission of DLC (digital logic circuit) is based on EPCGen2 communication protocol.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132738A (en) * | 2014-07-29 | 2014-11-05 | 深圳市锐能微科技有限公司 | Temperature sensor and temperature measurement method |
| CN104515617A (en) * | 2013-09-30 | 2015-04-15 | 江苏省电力公司常州供电公司 | Passive temperature measuring sensor of substation primary equipment |
| CN104515616A (en) * | 2013-09-30 | 2015-04-15 | 江苏省电力公司常州供电公司 | Temperature monitoring and inspecting system of substation primary equipment |
| CN107024508A (en) * | 2017-05-12 | 2017-08-08 | 华东交通大学 | A kind of wireless senser suitable for concrete structure health monitoring |
| CN111654828A (en) * | 2020-04-14 | 2020-09-11 | 深圳精匠云创科技有限公司 | Wireless data acquisition device based on 5G |
| CN112946025A (en) * | 2021-01-11 | 2021-06-11 | 中国石油天然气股份有限公司 | Resistance-capacitance oscillation-based underground casing inner coating detector and detection method thereof |
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2013
- 2013-01-30 CN CN 201320060293 patent/CN203069289U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515617A (en) * | 2013-09-30 | 2015-04-15 | 江苏省电力公司常州供电公司 | Passive temperature measuring sensor of substation primary equipment |
| CN104515616A (en) * | 2013-09-30 | 2015-04-15 | 江苏省电力公司常州供电公司 | Temperature monitoring and inspecting system of substation primary equipment |
| CN104515616B (en) * | 2013-09-30 | 2017-10-17 | 江苏省电力公司常州供电公司 | Transforming plant primary equipment temperature monitoring cruising inspection system |
| CN104132738A (en) * | 2014-07-29 | 2014-11-05 | 深圳市锐能微科技有限公司 | Temperature sensor and temperature measurement method |
| CN104132738B (en) * | 2014-07-29 | 2017-02-15 | 深圳市锐能微科技有限公司 | Temperature sensor and temperature measurement method |
| CN107024508A (en) * | 2017-05-12 | 2017-08-08 | 华东交通大学 | A kind of wireless senser suitable for concrete structure health monitoring |
| CN111654828A (en) * | 2020-04-14 | 2020-09-11 | 深圳精匠云创科技有限公司 | Wireless data acquisition device based on 5G |
| CN112946025A (en) * | 2021-01-11 | 2021-06-11 | 中国石油天然气股份有限公司 | Resistance-capacitance oscillation-based underground casing inner coating detector and detection method thereof |
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Address after: 311121 No. 16 Longtan Road, front street, Yuhang District, Zhejiang, Hangzhou Patentee after: Hangzhou Cheng Cheng Power Polytron Technologies Inc Address before: 311121 No. 16 Longtan Road, front street, Yuhang District, Zhejiang, Hangzhou Patentee before: Hangzhou Decheng Electric Power Technology Co.,Ltd. |
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Granted publication date: 20130717 Termination date: 20200130 |