Wireless temperature measuring device and method used for overhead conductor and capable of positioning

Abstract

The invention relates to the field of wireless environment measurement, in particular to a wireless temperature measuring device and method for positioning an overhead conductor. The system comprises a power supply module, a temperature measurement module and an NB-IOT module which are integrated. The temperature measurement module is electrically connected with the power supply module and is used for collecting temperature data; the NB-IOT module is electrically connected with the power supply module, the NB-IOT module is in communication connection with the temperature measurement module, and the NB-IOT module is used for uploading temperature data collected by the temperature measurement module and positioning data obtained by the NB-IOT module to a cloud server, or obtaining downlink data from the cloud server and transmitting the downlink data to the temperature measurement module for processing. According to the invention, the power supply module, the temperature measurement module and the NB-IOT module are integrally designed, the structure is compact, and the cost is low.

Description

Technical Field

[0001] The invention relates to the field of wireless environment measurement, and in particular to a wireless temperature measurement device and method for positioning overhead conductors. Background Art

[0002] The current wireless temperature measurement equipment has the following main shortcomings:

[0003] 1. For some methods that use external power supply equipment and network interaction equipment to separate power supply, network interaction and data collection, although it increases the use time of the equipment, it increases the extra cost and increases the size;

[0004] 2. Wireless temperature measurement equipment is often restricted by power supply and cannot maximize the use of resources. Before the service life of the equipment is reached, the power supply has been exhausted. At this time, human participation is generally required for maintenance; for some non-disassembled wireless temperature measurement equipment, after the power supply is exhausted, people may choose to directly discard and replace it with a new one, which greatly wastes resources, consumes manpower, and increases costs. Summary of the invention

[0005] The purpose of the present invention is to address the problems existing in the background technology and to propose a wireless temperature measurement device and method for positioning overhead wires. The power supply module, temperature measurement module and NB-IOT module are integrated in design, with compact structure and low cost.

[0006] On the one hand, the present invention proposes a wireless temperature measuring device for positioning overhead wires, including a power supply module, a temperature measuring module and a NB-IOT module integrated into one; the temperature measuring module is electrically connected to the power supply module, and the temperature measuring module is used to collect temperature data; the NB-IOT module is electrically connected to the power supply module, and the NB-IOT module is communicatively connected to the temperature measuring module, and the NB-IOT module is used to upload the temperature data collected by the temperature measuring module and the positioning data obtained by the NB-IOT module to a cloud server, or to obtain downlink data from the cloud server and transmit it to the temperature measuring module for processing.

[0007] Preferably, the power supply module includes a solar panel, a rechargeable lithium battery, a backup battery, a current collection and power CT, and a DC-DC conversion module. The solar panel is electrically connected to the rechargeable lithium battery through a cable, the current collection and power CT is connected in parallel to the overhead wire access terminal and electrically connected to the DC-DC conversion module, and the DC-DC conversion module is electrically connected to the NB-IOT module.

[0008] Preferably, it also includes a shell, the solar cell panel is installed on the outside of the shell, the rechargeable lithium battery and the backup battery are installed on the inside of the shell, and the temperature measurement module and the NB-IOT module are both installed on the shell.

[0009] Preferably, the temperature measurement module includes a temperature measuring resistor (thermistor) and an MCU (Microcontroller Unit), and the MCU performs AD sampling on the voltage of the temperature measuring resistor and processes and calculates the obtained AD sampling value to obtain temperature data.

[0010] Preferably, the NB-IOT module includes a NB-IOT filter antenna, a GPS and / or Beidou antenna, a SIM card holder, an Internet of Things card and a NB-IOT module. The NB-IOT filter antenna is used for the NB-IOT module to receive NB-IOT signals. The GPS and / or Beidou antenna is used for the NB-IOT module to receive GPS and / or Beidou positioning signals. The Internet of Things card is used for the NB-IOT module to access the network. The NB-IOT module is a module that integrates NB-IOT and GNSS positioning.

[0011] On the other hand, the present invention provides a wireless temperature measurement method for positioning an overhead conductor, which is implemented by the above-mentioned wireless temperature measurement device, and the method comprises the following steps:

[0012] S1, MCU wakes up and samples to obtain temperature data;

[0013] S2, MCU wakes up the NB-IOT module by pulling down the setting parameter value of the NB-IOT module setting pin, and then sends a command to turn off the sleep mode of the NB-IOT module;

[0014] S3, MCU uploads temperature data and positioning data to the cloud server through the NB-IOT module, or receives downlink commands from the cloud server for processing;

[0015] S4. After the data interaction between MCU and cloud server is completed, a command is sent to open the sleep mode of NB-IOT module. Then, NB-IOT module negotiates with core network with the set PSM (Power Saving Mode) parameters. If successful, it enters the set PSM mode. Otherwise, the core network determines the PSM parameters.

[0016] S5. After the MCU sets the wake-up time of the RTC (Real-Time Clock), it enters the low power consumption mode.

[0017] Preferably, in step S1, the steps for MCU to obtain temperature data are as follows:

[0018] S11, MCU connects to AD sampling point to obtain sampling voltage V 测温 , including steps A1-A2:

[0019] A1. By performing AD sampling on the internal reference voltage of the MCU, the AD sampling value of the internal reference voltage AD is obtained.REFINT , and then according to AD REFINT and the supply voltage V cc The relationship between V cc :

[0020]

[0021] A2, according to the AD sampling value AD of the sampling point 测温 , get the sampling voltage V 测温 :

[0022]

[0023] S12, combining step S11 and the resistance-temperature characteristic table of the temperature measuring resistor, obtaining a sampling voltage and temperature measuring temperature relationship curve and relationship expression by a linear fitting method;

[0024] S13. Acquire temperature data according to the relationship obtained in step S12.

[0025] Compared with the prior art, the present invention has the following beneficial technical effects:

[0026] 1. It can upload temperature data and positioning data at the same time, and obtain its location when the temperature exceeds the limit; it integrates power supply, collection, and network data interaction, with a smaller size, simple installation, and more complete;

[0027] 2. Charging the rechargeable lithium battery through the solar panel can provide longer battery life, and there is also a backup battery as a backup power source, which increases the hardware service life of the wireless temperature measurement device, saves resources, and reduces maintenance costs;

[0028] 3. Perform low-power processing on MCU and NB-IOT modules to reduce the power consumption of the entire device and save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural block diagram of a wireless temperature measuring device for positioning an overhead conductor according to a first embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the working mode of the power supply module;

[0031] Figure 3 This is a schematic diagram of the structure of the NB-IOT module;

[0032] Figure 4 This is a flow chart of a wireless temperature measurement method for positioning overhead conductors according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0033] Embodiment 1, as Figure 1-Figure 3As shown, the wireless temperature measuring device for positioning overhead wires proposed in this embodiment includes a power supply module, a temperature measuring module and an NB-IOT module, and a housing for installing the integrated power supply module, temperature measuring module and NB-IOT module, and the three modules are integrated into one. The power supply module is electrically connected to the temperature measuring module and the NB-IOT module to supply power to the temperature measuring module and the NB-IOT module.

[0034] like Figure 2 As shown, the power supply module includes a solar panel, a rechargeable lithium battery, a backup battery, a current acquisition power CT, and a DC-DC conversion module. The solar panel is installed on the outside of the outer shell to generate electricity in a place with light, and the rechargeable lithium battery and the backup battery are installed on the inside of the outer shell. The solar panel is electrically connected to the rechargeable lithium battery through a cable and can charge the rechargeable lithium battery. The backup battery serves as a backup power source when the rechargeable lithium battery is low on power. When the rechargeable lithium battery is low on power for a period of time and cannot drive the device, the device is powered by the backup battery until the rechargeable lithium battery is charged to the required level through the solar panel, and then powered by the rechargeable lithium battery again, or powered by the current acquisition power CT after DC-DC conversion.

[0035] The temperature measurement module is used to collect temperature data. The temperature measurement module includes a temperature measuring resistor and an MCU. The MCU is a low-power series chip, such as the MCUL15 series chip. The MCU performs AD sampling on the temperature measuring resistor voltage and processes and calculates the obtained AD sampling value to obtain temperature data.

[0036] The NB-IOT module is connected to the temperature measurement module for communication. The NB-IOT module is used to upload the temperature data collected by the temperature measurement module and the positioning data obtained by the NB-IOT module to the cloud server, or to obtain downlink data from the cloud server and transmit it to the temperature measurement module for processing.

[0037] like Figure 3 As shown, the NB-IOT module includes a NB-IOT filter antenna, a GPS and / or Beidou antenna, a SIM card holder, an IoT card and a NB-IOT module. The NB-IOT filter antenna is used for the NB-IOT module to receive NB-IOT signals, the GPS and / or Beidou antenna is used for the NB-IOT module to receive GPS and / or Beidou positioning signals, and the IoT card is installed on the SIM card holder. The IoT card is used for the NB-IOT module to access the network. The NB-IOT module uses the Quectel BC20 module, which is connected to the NB-IOT filter antenna, GPS and / or Beidou antenna and the SIM card holder. It is a module that integrates NB-IOT and GNSS positioning.

[0038] In this embodiment, charging the rechargeable lithium battery through the solar panel can provide longer battery life, and there is also a backup battery as a backup power source, which effectively improves the hardware service life of the wireless temperature measuring device, saves resources, and reduces maintenance costs. It can upload temperature data and positioning data at the same time and obtain its location when the temperature exceeds the limit; it integrates power supply, collection, and network data interaction, is smaller in size, simple to install, and more complete.

[0039] Embodiment 2, as Figure 1-Figure 4 As shown, the wireless temperature measurement method for positioning an overhead conductor proposed in this embodiment is implemented by the wireless temperature measurement device for positioning an overhead conductor in Embodiment 1. The method includes the following steps S1-S5:

[0040] S1. After MCU wakes up, it samples and obtains temperature data. The steps for MCU to obtain temperature data are as follows S11-S13:

[0041] S11, MCU connects to AD sampling point to obtain sampling voltage V 测温 , including steps A1-A2:

[0042] A1. By performing AD sampling on the internal reference voltage of the MCU, the AD sampling value of the internal reference voltage AD is obtained. REFINT , and then according to AD REFINT and the supply voltage V cc The relationship between V cc :

[0043]

[0044] A2, according to the AD sampling value AD of the sampling point 测温 , get the sampling voltage V 测温 :

[0045]

[0046] S12, combining step S11 and the resistance-temperature characteristic table of the temperature measuring resistor, obtaining a sampling voltage and temperature measuring temperature relationship curve and relationship expression by a linear fitting method;

[0047] S13, obtaining temperature data according to the relationship obtained in step S12;

[0048] S2. After MCU wakes up the NB-IOT module by pulling down the PSM-INT pin of the NB-IOT module for at least 40ms, it sends AT+QSCLK=0 and AT+CPSMS=0 to turn off the sleep mode of the NB-IOT module.

[0049] S3, MCU uploads temperature data and positioning data to the cloud server through the NB-IOT module, or receives downlink commands from the cloud server for processing;

[0050] S4. After the data exchange between MCU and cloud server is completed, AT+QSCLK=1 and AT+CPSMS=1 are sent to open the sleep mode of NB-IOT module. Then NB-IOT module negotiates with core network with set PSM parameters. If successful, it enters the set PSM mode. Otherwise, the core network determines the PSM parameters.

[0051] S5. After the MCU sets the wake-up time of the RTC, it enters the low power consumption mode.

[0052] In this embodiment, low-power processing is performed on the MCU and NB-IOT module, which greatly reduces the overall power consumption of the entire device, allowing the device to select a lower-capacity rechargeable lithium battery and backup battery, saving costs.

[0053] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A wireless temperature measuring device for positioning overhead conductors, characterized in that: Includes integrated power supply module, temperature measurement module and NB-IOT module; The temperature measurement module is electrically connected to the power supply module and is used to collect temperature data; The NB-IOT module is electrically connected to the power supply module and is communicatively connected to the temperature measurement module. It is used to upload the temperature data collected by the temperature measurement module and the positioning data obtained by the NB-IOT module to the cloud server, or to obtain downlink data from the cloud server and transmit it to the temperature measurement module for processing.

2. The wireless temperature measuring device for positioning overhead conductors according to claim 1, characterized in that: The power supply module includes a solar panel, a rechargeable lithium battery, a backup battery, a current collection and power CT, and a DC-DC conversion module. The solar panel is electrically connected to the rechargeable lithium battery through a cable, the current collection and power CT is connected in parallel to the overhead wire access terminal and electrically connected to the DC-DC conversion module, and the DC-DC conversion module is electrically connected to the NB-IOT module.

3. The wireless temperature measuring device for positioning overhead conductors according to claim 2, characterized in that: It also includes a shell, a solar panel is installed on the outside of the shell, a rechargeable lithium battery and a backup battery are installed on the inside of the shell, and a temperature measurement module and a NB-IOT module are both installed on the shell.

4. The wireless temperature measuring device for positioning overhead conductors according to claim 1, characterized in that: The temperature measurement module includes a temperature measuring resistor and an MCU. The MCU performs AD sampling on the voltage of the temperature measuring resistor and processes and calculates the obtained AD sampling value to obtain temperature data.

5. The wireless temperature measuring device for positioning overhead conductors according to claim 4, characterized in that: The NB-IOT module includes a NB-IOT filter antenna, a GPS and / or Beidou antenna, a SIM card holder, an IoT card and a NB-IOT module. The NB-IOT filter antenna is used for the NB-IOT module to receive NB-IOT signals. The GPS and / or Beidou antenna is used for the NB-IOT module to receive GPS and / or Beidou positioning signals. The IoT card is used for the NB-IOT module to access the network. The NB-IOT module is a module that integrates NB-IOT and GNSS positioning.

6. A wireless temperature measurement method for positioning overhead conductors, characterized in that: The method is implemented by the wireless temperature measuring device for positioning overhead conductors as claimed in claim 5, and comprises the following steps: S1, MCU wakes up and samples to obtain temperature data; S2, MCU wakes up the NB-IOT module by pulling down the setting parameter value of the NB-IOT module setting pin, and then sends a command to turn off the sleep mode of the NB-IOT module; S3, MCU uploads temperature data and positioning data to the cloud server through the NB-IOT module, or receives downlink commands from the cloud server for processing; S4. After the data interaction between MCU and cloud server is completed, a command is sent to open the sleep mode of NB-IOT module. Then NB-IOT module negotiates with core network with set PSM parameters. If successful, it enters the set PSM mode. Otherwise, the core network determines the PSM parameters. S5. After the MCU sets the wake-up time of the RTC, it enters the low power consumption mode.

7. The wireless temperature measurement method for positioning an overhead conductor according to claim 6, characterized in that: In step S1, the steps for MCU to obtain temperature data are as follows: S11, MCU connects to AD sampling point to obtain sampling voltage V 测温 , including steps A1-A2: A1. By performing AD sampling on the internal reference voltage of the MCU, the AD sampling value AD of the internal reference voltage is obtained. REFINT , and then according to AD REFINT and the supply voltage V cc The relationship between V cc : A2, according to the AD sampling value AD of the sampling point 测温 , get the sampling voltage V 测温 : S12, combining step S11 and the resistance-temperature characteristic table of the temperature measuring resistor, obtaining a sampling voltage and temperature measuring temperature relationship curve and relationship expression by a linear fitting method; S13. Acquire temperature data according to the relationship obtained in step S12.

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