CN116295892A - Passive temperature sensor - Google Patents
Passive temperature sensor Download PDFInfo
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- CN116295892A CN116295892A CN202310232407.6A CN202310232407A CN116295892A CN 116295892 A CN116295892 A CN 116295892A CN 202310232407 A CN202310232407 A CN 202310232407A CN 116295892 A CN116295892 A CN 116295892A
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- temperature sensor
- capacitor
- resistor
- switching regulator
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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
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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
- G01K1/028—Means for indicating or recording specially adapted for thermometers arrangements for numerical indication
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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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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- 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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/001—Energy harvesting or scavenging
Abstract
The invention discloses a passive temperature sensor, which comprises a control circuit board, a wireless communication module, a temperature sensor and a current induction power-taking module, wherein the temperature sensor is used for converting a temperature signal into an electric signal; the wireless communication module is used for communicating with an external terminal or a server; the current induction power taking module is connected with the control circuit board and is used for supplying power to the control circuit board; the control circuit board is provided with a CPU module which is respectively connected with the temperature sensor and the current induction electricity taking module and is used for processing the electric signals converted by the temperature sensor, acquiring temperature information and transmitting the acquired temperature information to an external terminal or a server through the wireless communication module. The invention adopts a current induction power-taking mode to provide power, omits a battery cable and is convenient to install; and checking the area to be monitored by a temperature sensor, and alarming an external terminal or a server through a wireless communication module.
Description
Technical Field
The invention relates to the technical field of monitoring equipment, and particularly discloses a passive temperature sensor.
Background
The internet of things (Internet of Things, ioT for short) is rapidly evolving and sensing is an important part thereof. Often IoT sensing nodes are battery powered and wired, which prevents deployment in some inaccessible or difficult to reach places, frequent battery replacement also increases maintenance costs, and battery and cabling increases area, which is detrimental to energy efficiency and high density distribution.
2498 is now worldwide responsible for power related death accidents. According to the international electric safety foundation report, 30000 workers are seriously injured by accidents related to electric power, and the workers need to be maintained to recover work. Therefore, there is a need for predictive maintenance solutions that reduce accidents and injuries and save manpower, resources, and money.
In industrial applications, intelligent passive temperature sensors can be used for predictive maintenance of data centers, monitoring hot spots, temperature, humidity levels inside servers or power switching devices in real time. The sensor has a compact appearance, can be placed on each piece of equipment in the server rack, and continuously monitors the inlet and outlet airflow temperature; the wireless function enables the device to still correspond to the sensor when moving between racks.
In the aspects of transportation and logistics service, the intelligent passive temperature sensor can be used for on-line monitoring of cold chain (food or medicine) temperature and logistics tracking, and ensuring that goods keep proper temperature and humidity so as to ensure compliance, reduce product loss and ensure safety of perishable goods.
In the prior art, forest fire monitoring is always completed by people or cameras, the energy consumption of the monitoring cameras is too high, a power supply system is needed to be matched with a communication network system when the cameras are installed in a forest, feasibility is not achieved in most forest areas, meanwhile, the cost of installing the cameras in large-scale forest areas is too high, the large-scale use cost is too high, the monitoring cameras can be monitored after the fire occurs, and early warning capability is lacked.
The power equipment is easy to cause the excessively high temperature rise of weak nodes of the equipment under the condition of overload or overlarge current-carrying capacity when working for a long time, thereby causing equipment faults. In order to ensure safe and reliable operation of equipment, detecting the temperature rise condition of weak nodes of power equipment has become a research hotspot in the field, traditional infrared temperature measurement and wax sheet temperature measurement are poor in instantaneity and accuracy, and a large amount of manpower is consumed. In addition, the existing temperature measuring sensor is powered by an external battery, and the service life of the existing temperature measuring sensor is limited by the capacity of the external battery.
Therefore, the existing temperature sensor has poor real-time performance and accuracy, and the service life of the node is limited by the capacity of the external battery, which is a technical problem in urgent need at present.
Disclosure of Invention
The invention provides a source temperature sensor, which aims to solve the technical problems that the existing temperature measuring sensor is poor in instantaneity and accuracy and the service life of a node is limited by the capacity of an external battery.
One aspect of the invention relates to a passive temperature sensor, comprising a control circuit board, a wireless communication module, a temperature sensor and a current sensing electricity taking module, wherein,
the temperature sensor is used for converting the temperature signal into an electric signal;
the wireless communication module is used for communicating with an external terminal or a server;
the current induction power taking module is connected with the control circuit board and is used for supplying power to the control circuit board;
the control circuit board is provided with a CPU module which is respectively connected with the temperature sensor and the current induction electricity taking module and is used for processing the electric signals converted by the temperature sensor, acquiring temperature information and transmitting the acquired temperature information to an external terminal or a server through the wireless communication module.
Further, the current induction power taking module comprises a bridge rectifier circuit, a switch voltage stabilizing circuit and an LC filter circuit which are sequentially connected.
Further, the switching voltage stabilizing circuit comprises a high-frequency buck switching voltage stabilizer, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, wherein a first pin of the high-frequency buck switching voltage stabilizer is connected with the LC filter circuit, a second pin of the high-frequency buck switching voltage stabilizer is connected with an anode output end of the bridge rectifier circuit through the second resistor and the first capacitor and the second capacitor which are connected in parallel, and a third pin of the high-frequency buck switching voltage stabilizer is grounded through the fourth capacitor and the fourth resistor which are connected in series; the fourth pin of the high-frequency step-down switching regulator is divided into two paths, one path is connected with the output end of the LC filter circuit through a fifth resistor, and the other path is grounded through a sixth resistor; the fifth pin of the high-frequency step-down switching regulator is connected with the negative electrode output end of the bridge rectifier circuit, the sixth pin of the high-frequency step-down switching regulator is connected with the negative electrode output end of the bridge rectifier circuit through a third resistor, the seventh pin of the high-frequency step-down switching regulator is connected with the positive electrode output end of the bridge rectifier circuit, and the eighth pin of the high-frequency step-down switching regulator is connected with the input end of the LC filter circuit through a third capacitor; the two ends of the first resistor are respectively connected with the second pin of the high-frequency buck switching regulator and the seventh pin of the high-frequency buck switching regulator.
Further, the LC filter circuit comprises an inductor, a fifth capacitor, a sixth capacitor and a diode, wherein the positive electrode of the diode is grounded, the negative electrode of the diode is connected with the input end of the inductor, and the output end of the inductor is grounded through the fifth capacitor and the sixth capacitor which are connected in parallel.
Further, the high-frequency buck switching regulator is of the type MP1584.
Further, the passive temperature sensor is provided with a shell, and the shell is provided with a hole communicated with the outside.
Further, the current induction electricity taking module is provided with an electricity taking alloy sheet, the shell is provided with a clamping groove with an outside opening and an induction temperature surface for inducing temperature, and the clamping groove is used for installing the electricity taking alloy sheet.
Further, the wireless communication module adopts RiTa spread spectrum communication wireless transmission, and the working frequency band of the wireless communication module comprises the national standard 470-510 MHz frequency band.
Further, the temperature sensor comprises a digital temperature sensing chip, and the model of the digital temperature sensing chip is DS18B20.
Further, the CPU module comprises an MCU chip, and the model of the MCU chip is STM32L0.
The beneficial effects obtained by the invention are as follows:
the invention provides a passive temperature sensor, which adopts a control circuit board, a wireless communication module, a temperature sensor and a current induction power taking module, wherein the current induction power taking module is connected with the control circuit board and is used for supplying power to the control circuit board; the control circuit board is provided with a CPU module, and the CPU module is used for processing the electric signals converted by the temperature sensor, acquiring temperature information and transmitting the acquired temperature information to an external terminal or a server through the wireless communication module. The passive temperature sensor provided by the invention is a wireless temperature measurement node based on current induction power acquisition, and the node adopts DS18B20 to realize temperature measurement; a wireless communication module is adopted to realize the remote and instant transmission of temperature measurement data; the current induction electricity taking module is used as a working power supply of the temperature measuring node, so that the problem that the service life of the node is limited by the capacity of an external battery is solved; the current induction power-taking mode is adopted to provide power, so that a battery cable is omitted, and the installation is convenient; and checking the area to be monitored by a temperature sensor, and alarming an external terminal or a server through a wireless communication module.
Drawings
FIG. 1 is a schematic diagram of internal electrical connections of an embodiment of a passive temperature sensor according to the present invention;
FIG. 2 is an external schematic view of an embodiment of a passive temperature sensor according to the present invention;
FIG. 3 is a schematic circuit diagram of a passive temperature sensor according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an embodiment of the current sensing power module shown in FIG. 3;
fig. 5 is a schematic circuit diagram of an embodiment of the wireless communication module shown in fig. 3;
FIG. 6 is a schematic circuit diagram of an embodiment of the temperature sensor shown in FIG. 3;
fig. 7 is a schematic circuit diagram of an embodiment of the CPU module shown in fig. 3.
Reference numerals illustrate:
10. a control circuit board; 20. a wireless communication module; 30. a temperature sensor; 40. a current induction power taking module; 50. a housing; 11. a CPU module; 41. taking an electric alloy sheet; 51. a clamping groove; 52. sensing a temperature surface.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, a first embodiment of the present invention proposes a passive temperature sensor, which includes a control circuit board 10, a wireless communication module 20, a temperature sensor 30, and a current sensing power taking module 40, wherein the temperature sensor 30 is used for converting a temperature signal into an electrical signal; a wireless communication module 20 for communicating with an external terminal or server; the current induction power taking module 40 is connected with the control circuit board 10 and is used for supplying power to the control circuit board 10; the control circuit board 10 is provided with a CPU module 11, and the CPU module 11 is respectively connected with the temperature sensor 30 and the current induction electricity taking module 40 and is used for processing the electric signals converted by the temperature sensor 30, acquiring temperature information and transmitting the acquired temperature information to an external terminal or a server through the wireless communication module 20. In this embodiment, the wireless communication module 20, the temperature sensor 30, the current sensing power taking module 40 and the CPU module 11 may use existing functional modules. The temperature sensor 30 may be a digital temperature sensor. In general, the temperature sensor 30 senses the temperature, and the CPU module 11 sends out the temperature value from the wireless communication module 20 in a set interval time, so as to perform a real-time monitoring function. When the temperature change is relatively large or the early warning temperature is reached, the CPU module 11 immediately sends out alarm information through the wireless communication module 20, and an alarm function is achieved.
In the above-mentioned structure, please refer to fig. 1 to 7, the passive temperature sensor provided in the present embodiment, the current sensing power taking module 40 includes a bridge rectifier circuit, a switching regulator circuit and an LC filter circuit, which are sequentially connected. The switching voltage stabilizing circuit comprises a high-frequency voltage reducing switching voltage stabilizer U176, a first resistor R101, a second resistor R102, a third resistor R103, a fourth resistor R104, a fifth resistor R105, a fifth resistor R106, a first capacitor C101, a second capacitor C102, a third capacitor C103 and a fourth capacitor C179, wherein a first pin of the high-frequency voltage reducing switching voltage stabilizer U176 is connected with the LC filter circuit, a second pin of the high-frequency voltage reducing switching voltage stabilizer U176 is connected with an anode output end of the bridge rectifier circuit through the second resistor R102 and the first capacitor C101 and the second capacitor C102 which are connected in parallel, and a third pin of the high-frequency voltage reducing switching voltage stabilizer U176 is grounded through the fourth capacitor C179 and the fourth resistor R104 which are connected in series; the fourth pin of the high-frequency step-down switching regulator U176 is divided into two paths, one path is connected with the output end of the LC filter circuit through a fifth resistor R105, and the other path is grounded through a sixth resistor R106; a fifth pin of the high-frequency step-down switching regulator U176 is connected with the negative electrode output end of the bridge rectifier circuit, a sixth pin of the high-frequency step-down switching regulator U176 is connected with the negative electrode output end of the bridge rectifier circuit through a third resistor R103, a seventh pin of the high-frequency step-down switching regulator U176 is connected with the positive electrode output end of the bridge rectifier circuit, and an eighth pin of the high-frequency step-down switching regulator U176 is connected with the input end of the LC filter circuit through a third capacitor C103; the two ends of the first resistor R101 are respectively connected to the second pin and the seventh pin of the high-frequency step-down switching regulator U176. In the passive temperature sensor provided by the embodiment, the LC filter circuit includes an inductor L102, a fifth capacitor C104, a sixth capacitor C105 and a diode D177, where the positive electrode of the diode D177 is grounded, the negative electrode of the diode D177 is connected to the input end of the inductor L102, and the output end of the inductor L102 is grounded through the fifth capacitor C104 and the sixth capacitor C105 connected in parallel. The model of the high-frequency step-down switching regulator U176 is MP1584.
Bridge rectifier circuits are the most used type of rectifier circuit. The circuit has the advantage of a full-wave rectifying circuit as long as two diodes are added to be connected into a bridge structure.
The bridge rectifier circuit works as follows: when the input is positive half cycle, applying forward voltage to the first diode D1 and the fourth diode D4, and conducting the first diode Dl and the fourth diode D4; the second diode D2 and the third diode D3 are applied with reverse voltages, and the second diode D2 and the third diode D3 are turned off. Forming positive half-wave rectification voltage on the output, and when the input is in a negative half cycle, applying positive voltage to the second diode D2 and the third diode D3, wherein the second diode D2 and the third diode D3 are conducted; the first diode D1 and the fourth diode D4 are turned off by applying a reverse voltage to the first diode D1 and the fourth diode D4. A rectified voltage of the other half wave, positive up and negative down, is also formed on the output. This is repeated, and the result is a full-wave rectified voltage at the output.
MP1584 high frequency buck switching regulator U176 is a high frequency buck switching regulator integrated with an internal high side high voltage power MOSFET. MP1584 high frequency buck switching regulator U176 uses a current control mode that provides a 3A current output and provides a fast loop response with a simple compensation design. The wide input range of 4.5V to 28V makes it suitable for various buck applications, and this embodiment uses this chip to stabilize the output current at DC5V.
The LC filter is composed of an inductor and a capacitor, and in order to reduce ripple voltage, a load and the capacitor are generally connected in parallel to a circuit, so that a smooth direct current is obtained at the output load end after the inductor and the capacitor are filtered, and the filter can also have a good filtering effect when current changes and fluctuates.
Preferably, referring to fig. 1 to 7, the passive temperature sensor according to the present embodiment is provided with a housing 50, and a hole communicating with the outside is formed in the housing 50, and the hole is used for fixing the housing 50 on an object to be measured. The outside of the housing has a securing structure for securing the housing 50 to the object to be monitored for temperature. The current induction power taking module 40 is provided with a power taking alloy sheet 41, the shell 50 is provided with a clamping groove 51 which is open to the outside and an induction temperature surface 52 for inducing temperature, and the clamping groove 51 is used for installing the power taking alloy sheet 41. The current induction power taking module 40 is used for providing electric energy by carrying out induction power taking by the power taking alloy sheet 41, and can realize power supply without connecting a cable and a battery. In this embodiment, the object to be monitored may be a power device such as a cable or a transformer, and the cost is too high due to the use of battery power supply, so that the power is supplied by using the current sensing power taking module 40, so that the passive temperature sensor can be put into use at low cost.
Further, please refer to fig. 1 to 7, in the passive temperature sensor according to the present embodiment, the wireless communication module 20 adopts RiTa spread spectrum communication for wireless transmission, and the working frequency band of the wireless communication module includes the national standard 470-510 MHz frequency band. The wireless communication module 20 has an antenna, and the control circuit board is provided with an opening for installing the antenna. The RiTa wireless transmission is an information transmission mode, and the frequency bandwidth occupied by signals is far greater than the minimum bandwidth required by the transmitted information; the widening of the frequency band is realized by a coding and modulating method and is irrelevant to the transmitted information data; at the receiving end, the same spreading code is used to perform relevant demodulation to despread and recover the transmitted information data. The wireless communication module 20 has an antenna located on the control circuit board 10, and the antenna does not need to be perforated on the housing 50, so that the integrity of the housing 50 is improved. Specifically, the antenna is used for transmitting electromagnetic wave signals, and the wireless communication module 20 has an antenna to send signals to a remote place, more specifically, the antenna is located on the control circuit board 10, and no hole is formed on the housing 50, so that the integrity of the housing 50 is improved.
The wireless communication module 20 comprises a wireless transceiver U1 and a radio frequency circuit, wherein the wireless transceiver U1 is of a model SX1268, the SX1268 is a long-distance low-power-consumption sub-GHz wireless transceiver which is proposed by Semtech company, and the supported working frequency range covers 150-
960MHz. SX1268 integrates a low noise Amplifier (LNA, low Noise Amplifie), with a maximum receive sensitivity of-148 dBm under Long Range Radio modulation, and also integrates a Power Amplifier (PA) with a maximum transmit Power of +22dBm. On the premise of adopting a DC-DC power distribution mode, the receiving current can reach 4.2mA at the minimum, and the low power consumption is realized in a true sense. Finally, the SX1268 integrated digital interface performs data interaction with the outside through the SPI. The SX1268 chip uses a 32MHz passive crystal oscillator to provide the clock. The radio frequency circuit part is divided into a transmitting circuit and a receiving circuit, and is separated by a radio frequency switch.
Preferably, please refer to fig. 1 to 7, the passive temperature sensor 30 of the present embodiment includes a digital temperature sensor chip U2, and the model number of the digital temperature sensor chip U2 is DS18B20. The DS18B20 temperature sensor chip U2 is extremely low in power consumption, long-term use can be ensured, and temperature can be effectively monitored. DS18B20 is a commonly used digital temperature sensor, and the output of the sensor is a digital signal, so that the sensor has small volume and low hardware cost; high anti-interference capability and high precision. The DS18B20 digital temperature sensor chip U2 is convenient to wire, and can be applied to various occasions after being packaged.
Further, please refer to fig. 1 to 7, in the passive temperature sensor provided in this embodiment, the CPU module includes an MCU chip, and the model adopted by the MCU chip is STM32L0.STM32L0 series is an entry level 32-bit ultra-low power consumption MCU product combination of an intentional semiconductor, and aims to realize a low power consumption level. The passive temperature sensor provided by the embodiment adopts a low-power consumption WSN (Wireless Sensor Networks, wireless sensor network) technology, combines a high-precision sensing technology with a wireless transmitting technology, adopts a current induction electricity taking technology to replace battery power supply, realizes real-time temperature acquisition, and ensures long-term stable operation of equipment.
As shown in fig. 1 to 7, the passive temperature sensor provided in this embodiment has the following working principle:
the temperature sensor 30 senses the temperature of the object to be monitored, and when the CPU module 11 confirms that the temperature abnormality occurs in the object to be monitored, the wireless communication module 20 sends the alarm information to the external terminal or the server to alarm, and it can be understood that the passive temperature sensor provided in this embodiment is disposed on the object to be monitored, and most of the object to be monitored is in an unmanned area or an area far away from the staff, that is, in-situ use of the acoustic alarm is not significant, and the wireless communication module 20 is required to alarm to the external terminal or the server.
Compared with the prior art, the passive temperature sensor provided by the embodiment adopts the control circuit board, the wireless communication module, the temperature sensor and the current induction power taking module, wherein the current induction power taking module is connected with the control circuit board and is used for supplying power to the control circuit board; the control circuit board is provided with a CPU module, and the CPU module is used for processing the electric signals converted by the temperature sensor, acquiring temperature information and transmitting the acquired temperature information to an external terminal or a server through the wireless communication module. The passive temperature sensor provided by the embodiment is a wireless temperature measurement node based on current induction power taking, and the node adopts DS18B20 to realize temperature measurement; a wireless communication module is adopted to realize the remote and instant transmission of temperature measurement data; the current induction electricity taking module is used as a working power supply of the temperature measuring node, so that the problem that the service life of the node is limited by the capacity of an external battery is solved; the current induction power-taking mode is adopted to provide power, so that a battery cable is omitted, and the installation is convenient; and checking the area to be monitored by a temperature sensor, and alarming an external terminal or a server through a wireless communication module.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A passive temperature sensor is characterized by comprising a control circuit board (10), a wireless communication module (20), a temperature sensor (30) and a current induction electricity taking module (40), wherein,
the temperature sensor (30) is used for converting a temperature signal into an electric signal;
the wireless communication module (20) is used for communicating with an external terminal or a server;
the current induction power taking module (40) is connected with the control circuit board (10) and is used for supplying power to the control circuit board (10);
the control circuit board (10) is provided with a CPU module (11), the CPU module (11) is respectively connected with the temperature sensor (30) and the current induction electricity taking module (40) and is used for processing electric signals converted by the temperature sensor (30), acquiring temperature information and transmitting the acquired temperature information to an external terminal or a server through the wireless communication module (20).
2. The passive temperature sensor of claim 1, wherein the current sensing power take-off module (40) comprises a bridge rectifier circuit, a switching regulator circuit, and an LC filter circuit connected in series.
3. The passive temperature sensor of claim 2, wherein the switching regulator circuit comprises a high frequency buck switching regulator, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, wherein a first pin of the high frequency buck switching regulator is connected with the LC filter circuit, a second pin of the high frequency buck switching regulator is connected with an anode output end of the bridge rectifier circuit through the second resistor, and the first capacitor and the second capacitor which are connected in parallel, and a third pin of the high frequency buck switching regulator is grounded through the fourth capacitor and the fourth resistor which are connected in series; the fourth pin of the high-frequency step-down switching regulator is divided into two paths, one path is connected with the output end of the LC filter circuit through a fifth resistor, and the other path is grounded through the sixth resistor; the fifth pin of the high-frequency buck switching regulator is connected with the negative electrode output end of the bridge rectifying circuit, the sixth pin of the high-frequency buck switching regulator is connected with the negative electrode output end of the bridge rectifying circuit through a third resistor, the seventh pin of the high-frequency buck switching regulator is connected with the positive electrode output end of the bridge rectifying circuit, and the eighth pin of the high-frequency buck switching regulator is connected with the input end of the LC filter circuit through a third capacitor; and two ends of the first resistor are respectively connected with a second pin and a seventh pin of the high-frequency buck switching regulator.
4. A passive temperature sensor according to claim 3, wherein the LC filter circuit comprises an inductor, a fifth capacitor, a sixth capacitor and a diode, the anode of the diode being grounded, the cathode of the diode being connected to the input of the inductor, the output of the inductor being grounded through the fifth capacitor and the sixth capacitor in parallel.
5. A passive temperature sensor as claimed in claim 3 wherein the high frequency buck switching regulator is of the type MP1584.
6. A passive temperature sensor according to claim 3, wherein a housing (50) is provided on the passive temperature sensor, and a hole communicating with the outside is provided on the housing (50).
7. The passive temperature sensor according to claim 6, wherein the current induction power taking module (40) is provided with a power taking alloy sheet (41), the shell (50) is provided with a clamping groove (51) which is open towards the outer side and an induction temperature surface (52) for inducing temperature, and the clamping groove (51) is used for installing the power taking alloy sheet (41).
8. A passive temperature sensor according to claim 3, wherein the wireless communication module (20) uses RiTa spread spectrum communication for wireless transmission, and the operating frequency band of the wireless communication module comprises the national standard 470-510 MHz frequency band.
9. A passive temperature sensor according to claim 3, characterized in that the temperature sensor (30) comprises a digital temperature sensor chip of the type DS18B20.
10. A passive temperature sensor according to claim 3, characterized in that the CPU module (11) comprises an MCU chip of the type STM32L0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310232407.6A CN116295892A (en) | 2023-02-28 | 2023-02-28 | Passive temperature sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310232407.6A CN116295892A (en) | 2023-02-28 | 2023-02-28 | Passive temperature sensor |
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| CN116295892A true CN116295892A (en) | 2023-06-23 |
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| CN202310232407.6A Pending CN116295892A (en) | 2023-02-28 | 2023-02-28 | Passive temperature sensor |
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