CN114739528A - Wireless temperature measurement circuit comprising super capacitor and battery and based on temperature difference power supply - Google Patents
Wireless temperature measurement circuit comprising super capacitor and battery and based on temperature difference power supply Download PDFInfo
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- CN114739528A CN114739528A CN202210377150.9A CN202210377150A CN114739528A CN 114739528 A CN114739528 A CN 114739528A CN 202210377150 A CN202210377150 A CN 202210377150A CN 114739528 A CN114739528 A CN 114739528A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 34
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 33
- 238000012545 processing Methods 0.000 claims abstract description 24
- 238000004146 energy storage Methods 0.000 claims abstract description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 24
- 229910052697 platinum Inorganic materials 0.000 claims description 12
- 239000010409 thin film Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000003306 harvesting Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- 238000005381 potential energy Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
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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
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/32—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from a charging set comprising a non-electric prime mover rotating at constant speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
- H02N11/002—Generators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Abstract
The wireless temperature measurement circuit comprises a super capacitor and a battery, and is based on temperature difference power supply, wherein in the wireless temperature measurement circuit based on the temperature difference power supply, a thermoelectric device converts heat energy generated by temperature difference into electric energy; the electric energy management module is electrically connected with the thermoelectric device to regulate electric energy and comprises a boosting unit connected with the thermoelectric device and an energy storage device connected with the boosting unit; the temperature acquisition module acquires temperature data of an object to be detected, and the temperature acquisition module is electrically connected with the electric energy management module; the signal processing module is electrically connected with the electric energy management module and the temperature acquisition module, and receives and processes the temperature data to generate a temperature signal; the wireless transmitting module is electrically connected with the electric energy management module and receives and transmits the temperature signal.
Description
Technical Field
The invention relates to the field of temperature measurement circuits, in particular to a wireless temperature measurement circuit comprising a super capacitor and a battery and based on temperature difference power supply.
Background
In recent years, autonomous devices have expanded our worldwide ways to connect, exchange, communicate, and operate, from smart watches to medical implant devices, from autonomous parking lots to industrial smart machines, all of which are under a revolutionary term, the internet of things (IoT). However, there is a significant aspect that hinders this evolving technology, namely the need for uninterruptible power supplies. To support the demand for continuous power, Energy Harvesting (EH) is a solution that addresses the power requirements and extends the lifetime of Wireless Sensor Nodes (WSNs). In recent years, wireless sensor networks have been increasingly used, however, one problem in wireless sensor network applications is the power supply problem of wireless sensor nodes. Due to the limited battery capacity, it is inconvenient, and sometimes impractical, to replace a large number of batteries for wireless sensor network nodes. The energy collection technology of the environmental energy source provides a solution for solving the problem. Various environmental energy sources have been considered for energy harvesting. The challenges and potential of renewable energy sources such as piezoelectric, solar, thermoelectric, wind, and radio frequency have been evaluated and demonstrated to be able to generate sufficient power for remote sensors. Electromagnetic, kinetic, thermoelectric, and airflow based energy sources are determined as potential energy sources within the building and the available energy is measured. Among these environmental energy sources, thermoelectric energy is an attractive solution.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the wireless temperature measurement circuit based on temperature difference power supply is provided, the problems of complex wiring of the existing sensor and limited battery capacity of the wireless sensor are solved, and the electric energy requirement is met. The circuit is self-powered and shows great application potential in the Internet of things. The purpose of the invention is realized by the following technical scheme.
The wireless temperature measuring circuit based on temperature difference power supply comprises,
a thermoelectric device that converts thermal energy generated by the temperature difference into electric energy;
the electric energy management module is electrically connected with the thermoelectric device to realize the lifting of the output voltage of the thermoelectric device and the storage of electric energy, and comprises a voltage boosting unit connected with the output of the thermoelectric device and an energy storage device connected with the voltage boosting unit;
the temperature acquisition module is used for acquiring temperature data of an object to be measured and is electrically connected with the electric energy management module;
the signal processing module is used for receiving the temperature data and sending a temperature signal through the wireless transmitting module;
wherein the content of the first and second substances,
the energy storage device comprises a super capacitor and a battery.
In the wireless temperature measurement circuit based on temperature difference power supply, the super capacitor is electrically connected with the boosting unit to store boosted electric energy and output the boosted electric energy.
When the thermoelectric device does not output voltage, the battery outputs electric energy.
In the wireless temperature measurement circuit based on temperature difference power supply, the output end of the boosting unit is connected with the super capacitor, and the super capacitor is 0.47F.
In the wireless temperature measurement circuit based on temperature difference power supply, the electric energy management module is disconnected when the super capacitor is charged.
In the wireless temperature measuring circuit based on temperature difference power supply, the electric energy output by the thermoelectric device is at least 20mV, and the boosting unit boosts the electric energy to at least 3.3V.
In the wireless temperature measurement circuit based on temperature difference power supply, the temperature acquisition module comprises a platinum resistor temperature sensor and a processing unit, and the platinum resistor temperature sensor comprises a thin film Pt100 attached to the surface of a measured object.
In the wireless temperature measurement circuit based on temperature difference power supply, the boosting unit comprises a DC/DC converter.
In the wireless temperature measurement circuit based on temperature difference power supply, the wireless transmitting module is a Bluetooth wireless transmitting module.
In the wireless temperature measuring circuit based on temperature difference power supply, the wireless temperature measuring circuit is distributed on two parallel PCB boards.
Advantageous effects
The present invention collects energy from an on-site heat source and then measures the collected temperature signal via, for example, bluetooth wireless transmission. When the thermoelectric device has output voltage, the generated low output voltage is processed and boosted by the boosting unit, so that the super capacitor can be charged, and electric energy is provided for subsequent acquisition and emission. If the thermoelectric module is not outputting voltage, the subsequent modules are powered by the battery. The specific strategies of temperature signal processing and wireless transmission are comprehensively considered so as to ensure higher transmission frequency. The test result shows that the circuit can successfully operate the temperature acquisition module, the signal processing module and the wireless sensor node under the conditions of lower input voltage and power supply. The temperature of the object to be measured is transmitted through Bluetooth and captured through a signal receiving circuit.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly apparent, and to make the implementation of the content of the description possible for those skilled in the art, and to make the above and other objects, features and advantages of the present invention more obvious, the following description is given by way of example of the specific embodiments of the present invention.
Drawings
Various additional advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
FIG. 1 is a schematic structural diagram of an embodiment of a wireless temperature measurement circuit based on temperature difference power supply according to the present invention;
FIG. 2 is a schematic diagram of a power management module of an embodiment of a wireless temperature measurement circuit based on temperature difference power supply according to the present invention;
FIG. 3 is a schematic diagram of a temperature acquisition module of an embodiment of a wireless temperature measurement circuit based on temperature difference power supply according to the present invention;
FIG. 4 is a schematic diagram of a signal processing module of an embodiment of a wireless temperature measurement circuit based on temperature difference power supply according to the present invention;
FIG. 5 is a schematic diagram of a wireless transmitting module of an embodiment of a wireless temperature measuring circuit based on temperature difference power supply of the present invention;
FIG. 6 is a waveform diagram of an operating current of an embodiment of the wireless temperature measurement circuit based on temperature difference power supply of the present invention.
The invention is further explained below with reference to the figures and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 6. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating an understanding of the embodiments of the present invention, the following description will be made in terms of several specific embodiments with reference to the accompanying drawings, and the drawings are not intended to limit the embodiments of the present invention.
As shown in fig. 1 to 5, the wireless temperature measuring circuit based on thermoelectric power supply includes,
a thermoelectric device that converts thermal energy generated by the temperature difference into electric energy;
the electric energy management module is electrically connected with the thermoelectric device to realize the lifting of the output voltage of the thermoelectric device and the storage of electric energy, and comprises a voltage boosting unit connected with the output of the thermoelectric device and an energy storage device connected with the voltage boosting unit, such as a super capacitor or a rechargeable battery;
the temperature acquisition module is used for acquiring temperature data of an object to be measured and is electrically connected with the electric energy management module;
the signal processing module is electrically connected with the electric energy management module, receives the temperature data through a micro processing unit such as a single chip microcomputer and the like, and is connected with the wireless transmitting module through a serial port to send a temperature signal;
and the wireless transmitting module is electrically connected with the electric energy management module and the signal processing module, and receives and transmits the temperature signal.
In a preferred embodiment of the wireless temperature measurement circuit based on temperature difference power supply, the energy storage device comprises a super capacitor and a battery.
In a preferred embodiment of the wireless temperature measuring circuit based on temperature difference power supply, the super capacitor is electrically connected with the boosting unit to store boosted electric energy and output the boosted electric energy, and when the thermoelectric device does not output voltage, the battery outputs electric energy.
In the preferred embodiment of the wireless temperature measurement circuit based on temperature difference power supply, the output end of the boosting unit is connected with a super capacitor, and the super capacitor is 0.47F.
In the preferred embodiment of the wireless temperature measurement circuit based on temperature difference power supply, when the super capacitor is charged, the electric energy management module is disconnected through the pin of the boosting unit and the delay circuit.
In the preferred embodiment of the wireless temperature measuring circuit based on temperature difference power supply, the electric energy output by the thermoelectric device is at least 20mV, and the boosting unit boosts the electric energy to at least 3.3V.
In the preferred embodiment of the wireless temperature measurement circuit based on temperature difference power supply, the temperature acquisition module comprises a platinum resistor temperature sensor and a processing unit, and the platinum resistor temperature sensor comprises a thin film Pt100 attached to the surface of a measured object.
In a preferred embodiment of the wireless temperature measurement circuit based on temperature difference power supply, the voltage boost unit comprises a DC/DC converter. It can be understood that the booster unit is preferably a booster chip.
In the preferred embodiment of the wireless temperature measuring circuit based on temperature difference power supply, the wireless transmitting module is a Bluetooth wireless transmitting module.
In the preferred embodiment of the wireless temperature measuring circuit based on temperature difference power supply, the wireless temperature measuring circuit is distributed on two parallel PCBs, wherein the energy storage device is positioned between the two parallel PCBs, so that the volume and the space occupation of the whole circuit module are reduced to the maximum extent.
In one embodiment, the thermoelectric device is integrated in the power management module.
In one embodiment, the power management module supplies power to the temperature acquisition module, the signal processing module and the Bluetooth wireless transmission module, the temperature acquisition module sends temperature data to the signal processing module, and finally the signal is transmitted through the Bluetooth wireless transmission module.
In one embodiment, the power management module includes a booster cell LTC3108, a super capacitor, and a battery. The boosting unit LTC3108 boosts the electric energy generated by the thermoelectric device TEG to 3.3V, stores energy by using a 0.47F super capacitor and supplies power to other modules. The battery acts as a backup power source and is enabled when there is no input to the thermoelectric device TEG.
In one embodiment, the signal processing module comprises a single chip microcomputer, the DIN and the DOUT are respectively connected to pins PA6 and PA7 of the single chip microcomputer through the spi communication of temperature data acquired by a processing unit of the temperature acquisition module, such as a chip AD7124, through a platinum resistor, and the temperature signals are sent to the single chip microcomputer for data processing. The AD chip and the single chip microcomputer work in a low-power-consumption working mode.
In one embodiment, PA2 and PA3 of the single chip microcomputer are connected to RX and TX pins of a Bluetooth chip E104-bt52 through uart communication, and the processed temperature signals control Bluetooth in an AT instruction mode to transmit information in a broadcasting mode.
In one embodiment, the AD chip operates in a low power mode; bluetooth reduces wireless work numbers by setting a broadcast mode; when the super capacitor is charged, in order to avoid meaningless power consumption, the electric energy management module is controlled to be disconnected with the subsequent modules through the pin of the boosting unit and the Nmos tube Q3 of the delay circuit. The Pmos tube Q1 is used for controlling the connection and disconnection of the battery, and when the battery supplies power, the sleep current of the single chip microcomputer is only about 1 uA.
In one embodiment, the circuit is a circuit module having a volume of 20mm by 12 mm.
In one embodiment, the present circuit harvests energy from an on-site heat source and then measures the collected temperature information via bluetooth wireless transmission. When the hot spot module has output voltage, the low output voltage (more than 20mV) generated by the hot spot module is processed and boosted by the boosting unit, so that the super capacitor can be charged to 3.3V, and electric energy is provided for subsequent acquisition and emission. If the thermoelectric device does not output a voltage, the subsequent modules are powered by the battery. Aiming at the problems that the output voltage and power of the TEG are small and the wireless sensor network node cannot be directly supplied with power, an electric energy management circuit is designed to boost and store the electric energy generated by the TEG. The boosting unit is first type-selected. The LTC3105, LTC3109, BQ25504, BQ25570, etc. chips can provide the thermoelectric devices with an electrical energy storage process at very low output voltages. According to the invention, an LTC3108 chip is selected for designing the booster circuit, and the lowest working input voltage value of the booster circuit is mainly considered as the lowest of all energy collection chips. The output end of the chip is connected with a 0.47F super capacitor to charge the super capacitor, so that energy supply is realized. In consideration of the problem that power cannot be supplied by collected energy due to insufficient heat sources or overhaul of heat source equipment and the like in practical application, a battery is added to serve as a backup power source to ensure the work of the wireless temperature measuring sensor. When the super capacitor is charged, in order to avoid meaningless power consumption, the electric energy management module is controlled to be disconnected with the subsequent modules through the pin of the boosting unit and the Nmos tube Q3 of the delay circuit. The Pmos tube Q1 is used for controlling the connection and disconnection of the battery, and when the battery supplies power, the sleep current of the single chip microcomputer is only about 1 uA. The idea of the temperature measuring circuit is that the output of a platinum resistor temperature sensor is connected to front-end chips such as AD7792, AD7175 and LTC2986, and temperature signals are conditioned. Considering low power consumption design and low noise characteristics, an AD7124-4 chip is selected to process the RTD signal and then send the RTD signal to a processing circuit. The thin film Pt100 is attached to the surface of an object to be measured, the temperature of the object to be measured is converted into voltage, and the voltage is input into the AD7124-4 chip. With the integrated PGA of AD7124-4, the small voltage of the platinum resistor can be easily detected and accurately converted into a digital signal. In a smaller range (0 ℃ to 60 ℃), the platinum resistance response is nearly linear. In order to achieve accurate measurement over a wide temperature range, a linearization process must be applied to the measured value to ensure that an accurate temperature value is obtained. The AD chip converts the voltage value into hexadecimal, pins DIN and DOUT of the AD chip are respectively connected to pins PA6 and PA7 of the single chip microcomputer, and the temperature signal is sent to the single chip microcomputer for data processing. The AD chip and the single chip microcomputer work in a low-power-consumption working mode.
PA2 and PA3 of the single chip microcomputer are connected to RX and TX pins of a Bluetooth chip E104-bt52 through uart communication, and the processed temperature signals control Bluetooth in an AT instruction mode to send information in a broadcast mode. Since the transmission is in the broadcast mode, the receiving end may receive many broadcast signals (other nearby bluetooth sources), which results in an increased workload for processing data. Therefore, frame header data needs to be added to the broadcast data and judged at the receiving end, so as to screen out the desired signal. E104-bt52 was developed based on DA14531 chip, so that it operated in broadcast mode with very low power consumption, and therefore the common Bluetooth chip with nRF52832 and CC2541 as cores was not used.
All electronic devices are reasonably arranged on two pcb boards, and a super capacitor and a standby battery are placed between the two boards, so that a circuit module with the volume of 20mm by 12mm is formed.
In one embodiment, the device comprises a power management module, a temperature acquisition module, a signal processing module and a Bluetooth wireless transmission module. An on-site heat source is collected and converted into electric energy through a thermoelectric device, the electric energy is input into a sensor circuit, and an extremely low voltage is converted into a normal working voltage of other modules of 3.3V through a highly integrated DC/DC converter of a chip LTC 3108. The chip output is programmed to one of four fixed voltages to power the wireless transmitter or sensor. Considering that the power management system is to supply power to the wireless transmission, an output mode of 3.3V is set. Since bluetooth transmissions require relatively high instantaneous power, a small thermoelectric device cannot provide such large power, and therefore requires an energy storage device. And a 0.47F super capacitor is connected to the output pin of the chip to charge the super capacitor. When the voltage level reaches 3.3V, power supply is started for the subsequent modules, so that the voltage of the super capacitor is reduced. When the voltage drops to a certain degree, the working voltage of other modules can not be reached, so that the super capacitor is disconnected from other modules through chip pins and a delay circuit design, the super capacitor is converted from a discharging state to a charging state, and the operation is repeated and circulated. In consideration of the problem that power cannot be supplied by collected energy due to insufficient heat sources or overhaul of heat source equipment and the like in practical application, a battery is added to serve as a backup power source to ensure the work of the wireless temperature measuring sensor. The Pmos tube is controlled to be switched on and off through the chip pin, so that the connection and disconnection of the battery are controlled. If no heat source voltage is input at the moment, the battery supplies power for other modules, the single chip microcomputer enters a timing sleep state at the moment, and the working current of the sleep state is only about 1 uA.
The processing unit used for thermometry is a chip AD7124-4, which is a low-power, low-noise, fully integrated analog front end for high-precision measurement, and comprises a low-noise, 24-bit sigma-delta analog-to-digital converter. The Pt100 platinum resistor is attached to the surface of an object to be measured, the temperature of the object to be measured is converted into voltage, and the voltage is input into the chip. With its integrated PGA, the small voltage of the platinum resistor can be easily detected and accurately converted into a digital signal. In a smaller range (0 ℃ to 60 ℃), the platinum resistance response is nearly linear. In order to achieve accurate measurement over a wide temperature range, a linearization process must be applied to the measured value to ensure that an accurate temperature value is obtained. The AD chip converts the voltage value into hexadecimal, pins DIN and DOUT of the AD chip are respectively connected to pins PA6 and PA7 of the single chip microcomputer, and the temperature signal is sent to the single chip microcomputer for data processing. The AD chip and the single chip microcomputer work in a low-power-consumption working mode. PA2 and PA3 of the single chip microcomputer are connected to RX and TX pins of a Bluetooth chip E104-bt52 through uart communication, and the processed temperature signals control Bluetooth in an AT instruction mode to send information in a broadcast mode. Since the transmission is in the broadcast mode, the receiving end may receive many broadcast signals (other nearby bluetooth sources), which results in an increased workload for processing data. Therefore, the frame header data is added to the broadcast data, and the judgment is performed at the receiving end, so as to screen out the desired signal, such as the working current waveform diagram shown in fig. 6, which can be seen that the invention has the advantages of high stability, low power consumption, and the like.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a wireless temperature measurement circuit based on difference in temperature power supply which characterized in that: which comprises the steps of preparing a mixture of a plurality of raw materials,
a thermoelectric device that converts thermal energy generated by the temperature difference into electric energy;
the electric energy management module is electrically connected with the thermoelectric device to realize the lifting of the output voltage of the thermoelectric device and the storage of electric energy, and comprises a voltage boosting unit connected with the output of the thermoelectric device and an energy storage device connected with the voltage boosting unit;
the temperature acquisition module is used for acquiring temperature data of an object to be measured and is electrically connected with the electric energy management module;
the signal processing module is used for receiving the temperature data and sending a temperature signal through the wireless transmitting module;
wherein, the first and the second end of the pipe are connected with each other,
the energy storage device comprises a super capacitor and a battery.
2. The wireless temperature measurement circuit based on temperature difference power supply of claim 1, wherein: preferably, the super capacitor is electrically connected with the boosting unit to store the boosted electric energy and output the boosted electric energy.
3. The wireless temperature measurement circuit based on temperature difference power supply of claim 1, wherein: when the thermoelectric device does not output voltage, the battery outputs electric energy.
4. The wireless temperature measurement circuit based on temperature difference power supply of claim 1, wherein: the output end of the boosting unit is connected with a super capacitor, and the super capacitor is 0.47F.
5. The wireless temperature measurement circuit based on temperature difference power supply of claim 1, wherein: and when the super capacitor is charged, the electric energy management module is disconnected.
6. The wireless temperature measurement circuit based on temperature difference power supply of claim 1, wherein: the electric energy output by the thermoelectric device is at least 20mV, and the boosting unit boosts the electric energy to at least 3.3V.
7. The wireless temperature measurement circuit based on temperature difference power supply of claim 1, wherein: the temperature acquisition module comprises a platinum resistance temperature sensor and a processing unit, and comprises a thin film Pt100 attached to the surface of a measured object.
8. The wireless temperature measurement circuit based on temperature difference power supply of claim 1, wherein: the boosting unit includes a DC/DC converter.
9. The wireless temperature measurement circuit based on temperature difference power supply of claim 1, wherein: the wireless transmitting module is a Bluetooth wireless transmitting module.
10. The wireless temperature measurement circuit based on temperature difference power supply of claim 1, wherein: the wireless temperature measuring circuit is distributed on the two parallel PCB boards.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928105A (en) * | 2012-10-18 | 2013-02-13 | 西安交通大学 | Device and method for measuring temperature of circuit breaker contact |
| CN103596293A (en) * | 2013-10-28 | 2014-02-19 | 天津大学 | Wireless sensor node stable power supply system based on minitype thermoelectric generator |
| CN103822729A (en) * | 2012-11-18 | 2014-05-28 | 西安思能网络科技有限公司 | Design of thermoelectric generation thermal system wireless temperature measuring apparatus |
| CN109100050A (en) * | 2018-09-25 | 2018-12-28 | 中国大唐集团科学技术研究院有限公司华中分公司 | Using the passive and wireless thermal power plant wall temperature measurement system of temperature difference module for power supply |
-
2022
- 2022-04-11 CN CN202210377150.9A patent/CN114739528A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928105A (en) * | 2012-10-18 | 2013-02-13 | 西安交通大学 | Device and method for measuring temperature of circuit breaker contact |
| CN103822729A (en) * | 2012-11-18 | 2014-05-28 | 西安思能网络科技有限公司 | Design of thermoelectric generation thermal system wireless temperature measuring apparatus |
| CN103596293A (en) * | 2013-10-28 | 2014-02-19 | 天津大学 | Wireless sensor node stable power supply system based on minitype thermoelectric generator |
| CN109100050A (en) * | 2018-09-25 | 2018-12-28 | 中国大唐集团科学技术研究院有限公司华中分公司 | Using the passive and wireless thermal power plant wall temperature measurement system of temperature difference module for power supply |
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