WO2021238543A1 - 一种无线测温系统及其测温方法 - Google Patents

一种无线测温系统及其测温方法 Download PDF

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WO2021238543A1
WO2021238543A1 PCT/CN2021/089689 CN2021089689W WO2021238543A1 WO 2021238543 A1 WO2021238543 A1 WO 2021238543A1 CN 2021089689 W CN2021089689 W CN 2021089689W WO 2021238543 A1 WO2021238543 A1 WO 2021238543A1
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temperature
circuit
mcu
voltage
lithium battery
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PCT/CN2021/089689
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English (en)
French (fr)
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束鹏飞
戴景峰
李龙龙
秦明辉
熊树海
池东亮
魏海波
胡道谱
王瑞
王攀
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科大智能科技股份有限公司
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Publication of WO2021238543A1 publication Critical patent/WO2021238543A1/zh

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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
    • G01K7/22—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 non-linear resistance, e.g. thermistor
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K2215/00—Details concerning sensor power supply
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K2219/00—Thermometers with dedicated analog to digital converters

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  • the present invention relates to the field of electric power technology, in particular to a wireless temperature measurement system and a temperature measurement method thereof.
  • the evolved wired connection host measurement method this method requires a lot of wiring planning, construction, etc.; the wireless temperature measurement sending method, this method requires too high and inflexible master station hardware; inspection robot image recognition dashboard Or the way the infrared camera judges the temperature of the measured object, this method requires too much of the measured object, it needs the hardware support of the temperature sensor and the measured place needs to be able to be observed.
  • the purpose of the present invention is to overcome the defects of the above-mentioned background technology and provide a simple, effective, and universal wireless temperature measurement method for the host system.
  • the present invention adopts a wireless temperature measurement system, including a master temperature collection unit and a plurality of slave temperature sensing units.
  • the slave temperature sensing unit is connected with the measured object to measure the temperature of the measured object.
  • the slave temperature sensing unit It is wirelessly connected with the main temperature collection unit to send the collected temperature of the measured object to the main temperature collection unit, and the main temperature collection unit is connected to the host to send the collected temperature information to the host.
  • the slave temperature sensing unit includes a temperature sensor, a temperature detection circuit, a first MCU, a first power management circuit, a lithium battery, a lithium battery voltage measurement circuit, a first watchdog circuit, a first RF wireless transmission module, and The first RF antenna;
  • the temperature sensor is installed on the measured object, the temperature sensor is connected to the first MCU through the temperature detection circuit, the first watchdog circuit is connected to the output terminal of the first MCU, and the lithium battery is connected to the first MCU through the lithium battery voltage measurement circuit.
  • the input terminal is connected, and the output terminal of the first MCU is connected to the main temperature collection unit via the first RF wireless transmission module and the first RF antenna
  • the lithium battery output terminal is connected to the first power management circuit, and the first power management circuit is respectively connected to the temperature detection circuit, the first watchdog circuit, the lithium battery voltage measurement circuit, the first MCU and the first RF wireless transmission module to supply power to it .
  • the first MCU is a low-power MCU.
  • the temperature detection circuit includes a first voltage divider circuit, a voltage follower circuit, and a MOSFET switch circuit.
  • the output of the first voltage divider circuit is connected to the voltage follower circuit.
  • the voltage follower circuit and the MOSFET switch circuit are both connected to the first voltage follower circuit. MCU connection.
  • the lithium battery voltage measurement circuit adopts a second voltage divider circuit.
  • the second voltage divider circuit includes resistors R10, R11, and R12.
  • a capacitor C16 is connected in parallel at both ends, and one end of the capacitor C16 is connected to the ADC pin of the first MCU.
  • the main temperature collection unit includes a USB interface, a USB to serial port, a second MCU, a second watchdog circuit, a second power management circuit, a second RF wireless transmission module, and a second RF antenna;
  • the second RF wireless transmission module is connected to the first RF antenna via the second RF antenna, the output of the second RF wireless transmission module is connected to the second MCU, and the second MCU output is connected to the host via the USB to serial port and USB interface , The second MCU output is connected to the second watchdog circuit;
  • the USB interface is connected to the input end of the second power management circuit, and the output end of the second power management circuit is respectively connected to the second MCU, the second watchdog circuit, the second RF wireless transmission module, and the USB to serial port for power supply.
  • first watchdog circuit and the second watchdog circuit both adopt watchdog chip circuits.
  • the first power management circuit includes a 3.3V low dropout linear regulator and a 2.5V reference voltage regulator circuit
  • the second power management circuit uses a 3.3V low dropout linear regulator.
  • a method of using a wireless temperature measurement system includes:
  • the first MCU operates the first watchdog circuit to feed the watchdog;
  • the temperature detection circuit saves the temperature value of the measured object collected by the temperature sensor in the first MCU, and the lithium battery voltage measurement circuit measures the voltage of the lithium battery and saves the voltage in the first MCU;
  • the main temperature collection unit stores the measured object temperature value and the lithium battery voltage in the second MCU Modbus table for the host to read through the USB interface using the Modbus protocol.
  • the first MCU operates the first watchdog circuit to feed the watchdog;
  • the temperature detection circuit saves the temperature value of the measured object collected by the temperature sensor in the first MCU, and the lithium battery voltage measurement circuit measures the voltage of the lithium battery and saves the voltage in the first MCU;
  • the first MCU sends the temperature value of the measured object and the voltage of the lithium battery to the main temperature collection unit via wireless transmission, and waits for the response of the main temperature collection unit to enter a low-power sleep state;
  • the main temperature collection unit stores the measured object temperature value and the lithium battery voltage in the second MCU Modbus table for the host to read through the USB interface using the Modbus protocol.
  • the present invention has the following technical effects:
  • the temperature sensing unit is powered by a lithium battery, which is convenient for on-site installation
  • the first MCU is a low-power MCU, which uses ultra-low power consumption to collect the measured object Temperature information and lithium battery power information, long use time and convenient for later maintenance.
  • the main temperature collection unit adopts USB hardware socket and Modbus software interface to connect with the host, making the host type setting more flexible.
  • Figure 1 is a structural diagram of a wireless temperature measurement system
  • Figure 2 is a circuit structure diagram of the temperature detection circuit
  • Figure 3 is a circuit structure diagram of a lithium battery voltage measurement circuit
  • Figure 4 is a circuit structure diagram of the watchdog circuit
  • Figure 5 is a circuit structure diagram of the power management circuit
  • Figure 6 is a flow chart of the air matching mode slave device
  • Figure 7 is a flow chart of the slave device in the air active reporting mode.
  • this embodiment discloses a wireless temperature measurement system, including: a master temperature collection unit 13 and a plurality of slave temperature sensing units 2.
  • the slave temperature sensing unit 2 is connected to the measured object 1 for measuring the measured temperature.
  • the temperature of the object 1 is wirelessly connected from the temperature sensing unit 2 to the main temperature collection unit 13 to send the collected temperature of the measured object 1 to the main temperature collection unit 13, and the main temperature collection unit 13 is connected to the host to collect the The temperature information is sent to the host 12.
  • This embodiment uses the one-master multi-slave method to realize real-time temperature measurement of multiple measured objects 1.
  • the slave temperature sensing unit 2 and the master temperature collection unit 13 use RF wireless connection, ID number identification, and transmission use convenient.
  • the slave temperature sensing unit 2 includes a temperature sensor 21, a temperature detection circuit 3, a first MCU 5, a first power management circuit 8, a lithium battery 9, a lithium battery voltage measurement circuit 10, a first watchdog circuit 11, The first RF wireless transmission module 6 and the first RF antenna 4;
  • the temperature sensor 21 is installed on the measured object 1, the temperature sensor 21 is connected to the first MCU5 through the temperature detection circuit 3, the first watchdog circuit 11 is connected to the output terminal of the first MCU5, and the lithium battery 9 is connected to the voltage of the lithium battery 9.
  • the measurement circuit is connected to the input end of the first MCU5, and the output end of the first MCU5 is connected to the main temperature converging unit 13 via the first RF wireless transmission module 6, the first RF antenna 4
  • the output terminal of the lithium battery 9 is connected to the first power management circuit 8.
  • the first power management circuit 8 is respectively connected to the temperature detection circuit 3, the first watchdog circuit 11, the voltage measurement circuit of the lithium battery 9, the first MCU5 and the first RF wireless
  • the transmission module 6 is connected to supply power.
  • the first MCU5 is a low-power MCU.
  • the temperature sensing unit 2 uses a lithium battery 9 for power supply, which is convenient for on-site installation; the low-power design is used to get rid of the power supply problem, which can be used for more than 5 years, and the battery power information can be uploaded to facilitate maintenance.
  • the temperature detection circuit 3 includes a first voltage divider circuit 31, a voltage follower circuit 32, and a MOSFET switch circuit 33; wherein, TEMP_PWR and TEMPH_PWR are respectively connected to the pins of the first MCU5, and the first MCU5 can
  • the mos tube switch circuit 33 is controlled by controlling the high and low levels, and the first voltage divider circuit is formed by selecting the 10k ohm resistor R15, the 330 ohm resistor R16 and the thermistor R17.
  • the thermistor R17 has different characteristics of its own resistance according to the external temperature, and according to Ohm's theorem, the temperature change will be converted into the voltage change at both ends of the thermistor R17.
  • the voltage follower circuit is formed according to the characteristics of the power amplifier, and the voltage at TEMP_AD reflects the voltage of the thermistor R17.
  • TEMP_AD is connected to the ADC (analog-to-digital converter) pin of the first MCU5, and the voltage value can be calculated, and the temperature value can be calculated according to the algorithm between voltage and temperature.
  • the first MCU5 chip wakes up from sleep mode, changes the TEMP_PWR and TEMPH_PWR levels respectively to turn on the MOS transistor switch circuit 33, according to the voltage divider circuit 32 and the voltage follower circuit 31, reads the voltage across the thermistor R17 through TEMP_AD to calculate the current temperature .
  • TEMP_PWR has a smaller temperature resolution and a larger temperature acquisition range.
  • TEMPH_PWR has a larger temperature resolution and a wider temperature collection range.
  • the voltage measurement circuit of the lithium battery 9 adopts a second voltage divider circuit, which divides the battery voltage through R10 and R12. According to Ohm’s law, the battery voltage can be calculated from the R12 voltage, and the DC-BAT is connected to the MCU ADC Pin, can read R12 voltage. MCU wakes up in sleep mode, after measuring the temperature, read the voltage of R12 to calculate the battery voltage.
  • the main temperature collection unit 13 includes a USB interface 14, a USB to serial port 15, a second MCU 17, a second watchdog circuit 16, a second power management circuit 18, a second RF wireless transmission module 19, and a second RF Antenna 20;
  • the second RF wireless transmission module 19 is connected to the first RF antenna 4 via the second RF antenna 20, the output of the second RF wireless transmission module 19 is connected to the second MCU 17, and the output of the second MCU 17 is via the USB to serial port 15, USB interface 14 is connected to the host 12, and the output of the second MCU 17 is connected to the second watchdog circuit 16;
  • the USB interface 14 is connected to the input end of the second power management circuit 18, and the output end of the second power management circuit 18 is respectively connected to the second MCU 17, the second watchdog circuit 16, the second RF wireless transmission module 19, and the USB to serial port 15 Power it.
  • the main temperature collection unit 13 adopts a USB hardware interface, and a Modbus software interface is connected to the host 12. Makes the host 12 more flexible in type settings and more open to use. It can be connected to the host 12 with a USB interface 14 including computers, mobile phones, tablets, TTU (intelligent distribution terminal), inspection robots, etc., and the main temperature collection unit 13
  • the use of USB power supply is universal and convenient, reducing the difficulty of use.
  • the main temperature collection unit 13 adopts two working modes of active reporting and air matching for interaction, which is flexible in use, reduces power consumption, and improves product stability.
  • the air matching mode is shown in Figure 6.
  • the temperature sensing unit 2 enters the sleep ultra-low power consumption state, the sleep cycle is reached, and the module wakes up and turns into a working state.
  • the first step is to feed the dog with the watchdog, and the second step is to measure the temperature of the temperature sensor 21.
  • the third step is to detect the battery voltage
  • the fourth step is to set the RF wireless module to the receiving mode, and the receiving timeout module enters the sleep state.
  • the main temperature collection unit 13 receives the information to read, and sends the temperature and battery voltage information to the temperature collection unit, and the module enters the sleep state.
  • This mode is suitable for reading temperature data of mobile objects, such as inspection robots inserted into the temperature collection unit, mobile phones inserted into the temperature collection unit, manual inspections, etc.
  • the active reporting mode is shown in Figure 7.
  • the temperature sensing unit 2 enters the sleep ultra-low power consumption state. When the sleep cycle is reached, the module wakes up and transforms into a working state.
  • the first step is to feed the dog by the watchdog, and the second step is to measure the temperature of the temperature sensor 21.
  • the battery voltage is detected.
  • the module sends the collected temperature information of the measured object 1 and the power information of the lithium battery 9.
  • the main temperature collection unit 13 responds, and the module enters the low-power sleep mode. If no response is received, the module continues to send until the number of retransmissions is exceeded, and the module enters a low-power sleep mode.
  • This mode is suitable for fixing the host 12 near the slave module without moving it, such as a TTU with a temperature collection unit, a desktop computer with a temperature collection unit, etc.
  • the first watchdog circuit 11 and the second watchdog circuit 16 both include watchdog chip circuits.
  • the power management circuit supplies power to the watchdog chip, and the watchdog chip starts to work.
  • the WDI pin of the watchdog chip is connected to the MCU IO port (general input and output interface), and RESET is connected to the MCU RESET pin (reset pin).
  • the MCU periodically feeds the WDI with a pulse signal to feed the dog, and the watchdog chip obtains the dog feed signal. No pulse signal is output to the RESET pin, and no MCU is reset. If the MCU fails to feed the dog, the watchdog chip will output a pulse signal to reset the MCU to remove the fault.
  • the first power management circuit 8 and the second power management circuit 18 both include a 3.3V low dropout linear regulator, and the first power management circuit 8 also includes a 2.5V reference voltage regulator circuit.
  • the first power management circuit 83.3V low dropout linear regulator stabilizes the battery voltage to 3.3V for the lithium battery 9 voltage measurement circuit, watchdog circuit, temperature measurement circuit, RF wireless transmission module, and low-power MCU.
  • the 2.5V reference voltage regulator circuit is used as a voltage divider power supply for the temperature measurement circuit and the battery voltage measurement circuit. And input the reference voltage into the MCU reference voltage input port. Provide accurate ADC reference voltage.
  • the second power management circuit 183.3V low dropout linear regulator converts the voltage provided by the USB interface 14 into a stable 3.3V voltage, and supplies it to the USB to serial port 15 circuit, watchdog circuit, RF wireless transmission circuit, and MCU.
  • This embodiment also discloses a method for using the wireless temperature measurement system, which includes the following steps of an air matching mode:
  • the first MCU5 operates the first watchdog circuit 11 to feed the watchdog;
  • the temperature detection circuit 3 saves the temperature value of the measured object 1 collected by the temperature sensor 21 in the first MCU5, and the lithium battery 9 voltage measurement circuit measures the voltage of the lithium battery 9 and saves the voltage in the first MCU5;
  • the main temperature collection unit 13 stores the temperature value of the measured object and the voltage of the lithium battery 9 in the second MCU 17 Modbus table for the host 12 to read through the USB interface 14 using the Modbus protocol.
  • the first MCU5 operates the first watchdog circuit 11 to feed the watchdog;
  • the temperature detection circuit 3 saves the temperature value of the measured object collected by the temperature sensor 21 in the first MCU5, and the lithium battery 9 voltage measurement circuit measures the voltage of the lithium battery 9 and saves the voltage in the first MCU5;
  • the first MCU5 sends the temperature value of the measured object and the voltage of the lithium battery 9 to the main temperature collection unit 13 via wireless transmission, and waits for the response of the main temperature collection unit 13 to enter a low-power sleep state;
  • the main temperature collection unit 13 stores the temperature value of the measured object and the voltage of the lithium battery 9 in the second MCU 17 Modbus table for the host 12 to read through the USB interface 14 using the Modbus protocol.
  • the two working modes of active reporting and air matching are adopted between the temperature sensing unit 2 and the main temperature collection unit 13 to interact, which is flexible in use, reduces power consumption, and improves product stability.
  • the low-power MCU is generally in a low-power sleep mode, and enters the wake-up mode when the wake-up time is reached.
  • the low-power MCU operates the first watchdog circuit 11 , To ensure the normal operation of the slave temperature sensing unit 2.
  • the second MCU 17 operates the second watchdog circuit 16 at intervals to ensure the stable operation of the program.
  • the host 12 can determine the operating temperature of the detected device based on the acquired temperature value of the measured object, and can determine the current operating status of the device based on the current temperature. If the temperature is too high, the device may be abnormal, and the device can be repaired on site.
  • the host 12 can determine the current power status of the slave temperature sensing unit 2 according to the acquired power information of the lithium battery 9, and can perform maintenance based on the power status of the slave temperature sensing unit 2 on site, such as battery replacement or device replacement with low power.

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  • General Physics & Mathematics (AREA)
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Abstract

一种无线测温系统及其测温方法，属于电力技术领域，包括：主温度汇集单元（13）和多个从温度感知单元（2），从温度感知单元（2）与被测物体（1）连接用于测量被测物体（1）的温度，从温度感知单元（2）与主温度汇集单元（13）经无线方式连接以将采集的被测物体（1）的温度发送至主温度汇集单元（13），主温度汇集单元（13）与主机（12）连接以将汇集的温度信息发送至主机（12）。

Description

一种无线测温系统及其测温方法 技术领域
本发明涉及电力技术领域，特别涉及一种无线测温系统及其测温方法。
背景技术
随着我国经济的快速发展和科技水平的不断提高，电力设备越来越丰富，尤其是高精端设备越来越丰富，这些设备对温度要求非常高。不同的温度对设备影响巨大，如变压器触头，实时温度反映了用电负荷情况，如果在高负荷情况下触头温度会升高，温度升高会影响变压器性能从而致使变压器故障，最后导致停电等一些不可估量的经济损失。
随着智能化社会发展，传统的人为抄读温度仪表盘的方式已不能应对当前飞速发展的社会。演变出来的有线式连接主机进行测量方式，此种方式对布线规划，施工等要求大；无线测温发送方式，此种方式对主站硬件要求过高且不灵活；巡检机器人图像识别仪表盘或者红外相机判断被测物体温度的方式，此种方式对被测物要求过高，需要有温度传感器硬件支持且被测地方需要能够被观察。
发明内容
本发明的目的在于克服上述背景技术存在的缺陷，提供一种简便有效且对主机系统通用的无线测温方式。
为实现以上目的，本发明采用一种无线测温系统，包括主温度汇集单元和多个从温度感知单元，从温度感知单元与被测物体连接用于测量被测物体的温度，从温度感知单元与主温度汇集单元经无线方式连接以将采集的被测物体的温度发送至主温度汇集单元，主温度汇集单元与主机连接以将汇集的温度信息发送至主机。
进一步地，所述从温度感知单元包括温度传感器、温度检测电路、第一MCU、第一电源管理电路、锂电池、锂电池电压测量电路、第一看门狗电路、第一RF无线传输模块和第一RF天线；
温度传感器安装在所述被测物体上，温度传感器经温度检测电路与第一MCU连接，第一看门狗电路与第一MCU输出端连接，锂电池经锂电池电压测量电路与第一MCU的输入端连接，第一MCU的输出端经第一RF无线传输模块、第一RF天线与所述主温度汇集单元连接
锂电池输出端与第一电源管理电路连接，第一电源管理电路分别与温度检测电路、第一看门狗电路、锂电池电压测量电路、第一MCU和第一RF无线传输模块连接为其供电。
进一步地，所述第一MCU为低功耗MCU。
进一步地，所述温度检测电路包括第一分压电路、电压跟随电路和mos管开关电路，第一分压电路输出与电压跟随电路连接，电压跟随电路和mos管开关电路均与所述第一MCU连接。
进一步地，所述锂电池电压测量电路采用第二分压电路，第二分压电路包括电阻R10、R11和R12，电阻R11经插接件与电阻R10连接，电阻R12与电阻R10串联，电阻R12两端并联有电容C16，电容C16一端连接所述第一MCU的ADC引脚。
进一步地，所述主温度汇集单元包括USB接口、USB转串口、第二MCU、第二看门狗电路、第二电源管理电路、第二RF无线传输模块和第二RF天线；
第二RF无线传输模块经第二RF天线与所述第一RF天线连接，第二RF无线传输模块输出端与第二MCU连接，第二MCU输出经USB转串口、USB接口与所述主机连接，第二MCU输出与第二看门狗电路连接；
USB接口与第二电源管理电路输入端连接，第二电源管理电路的输出端分别与第二MCU、第二看门狗电路、第二RF无线传输模块以及USB转串口连接为其供电。
进一步地，所述第一看门狗电路和第二看门狗电路均采用看门狗芯片电路。
进一步地，所述第一电源管理电路包括3.3V低压差线性稳压器和2.5V基准稳压电路，第二电源管理电路采用3.3V低压差线性稳压器。
另一方面，采用一种无线测温系统的使用方法，包括：
从温度感知单元中，第一MCU对第一看门狗电路进行操作，进行看门狗喂狗；
温度检测电路将温度传感器所采集的被测物体的温度值保存在第一MCU中，锂电池电压测量电路测量锂电池的电压并将电压保存至第一MCU中；
将第一RF无线传输模块设置为接收模式，并在接收模式过程中接收到主温度汇集单元发送的读取信息指令，并根据读取信息指令将锂电池的电压和被测物体的温度值发送至主温度汇集单元中，发送完毕后进入睡眠状态；
所述主温度汇集单元将被测物体温度值和锂电池电压存储在第二MCU Modbus表中以供主机通过USB接口使用Modbus规约读取。
进一步地，还包括：
从温度感知单元中，第一MCU对第一看门狗电路进行操作，进行看门狗喂狗；
温度检测电路将温度传感器所采集的被测物体的温度值保存在第一MCU中，锂电池电压测量电路测量锂电池的电压并将电压保存至第一MCU中；
第一MCU经无线传输方式将被测物体的温度值和锂电池电压发送至所述主温度汇集单元并等待主温度汇集单元应答后进入低功耗睡眠在状态；
所述主温度汇集单元将被测物体温度值和锂电池电压存储在第二MCU Modbus表中以供主机通过USB接口使用Modbus规约读取。
与现有技术相比，本发明存在以下技术效果：本发明中从温度感知单元采用锂电池供电，方便现场安装，且第一MCU为低功耗MCU，采 用超低功耗方式采集被测物体温度信息和锂电池电量信息，使用时间长且方便后期维护。主温度汇集单元采用USB硬件插口、Modbus软件接口与主机连接，使得主机种类设置更加灵活。
附图说明
下面结合附图，对本发明的具体实施方式进行详细描述：
图1是一种无线测温系统的结构图；
图2是温度检测电路的电路结构图；
图3是锂电池电压测量电路的电路结构图；
图4是看门狗电路的电路结构图；
图5是电源管理电路的电路结构图；
图6是空中匹配模式从设备流程图；
图7是空中主动上报模式从设备流程图。
具体实施方式
为了更进一步说明本发明的特征，请参阅以下有关本发明的详细说明与附图。所附图仅供参考与说明之用，并非用来对本发明的保护范围加以限制。
如图1所示，本实施例公开了一种无线测温系统，包括：主温度汇集单元13和多个从温度感知单元2，从温度感知单元2与被测物体1连接用于测量被测物体1的温度，从温度感知单元2与主温度汇集单元13经无线方式连接以将采集的被测物体1的温度发送至主温度汇集单元13，主温度汇集单元13与主机连接以将汇集的温度信息发送至主机12。
本实施例使用一主多从的方式，可实现对多个被测物体1进行实时温度测量，从温度感知单元2和主温度汇集单元13之间使用RF无线无线连接，ID号辨识，传输使用方便。
进一步地，所述从温度感知单元2包括温度传感器21、温度检测电路3、第一MCU5、第一电源管理电路8、锂电池9、锂电池电压测量电路10、第一看门狗电路11、第一RF无线传输模块6和第一RF天线4；
温度传感器21安装在所述被测物体1上，温度传感器21经温度检测电路3与第一MCU5连接，第一看门狗电路11与第一MCU5输出端连接，锂电池9经锂电池9电压测量电路与第一MCU5的输入端连接，第一MCU5的输出端经第一RF无线传输模块6、第一RF天线4与所述主温度汇集单元13连接
锂电池9输出端与第一电源管理电路8连接，第一电源管理电路8分别与温度检测电路3、第一看门狗电路11、锂电池9电压测量电路、第一MCU5和第一RF无线传输模块6连接为其供电。
其中，所述第一MCU5为低功耗MCU。
需要说明的是，从温度感知单元2采用锂电池9供电，方便现场安装；采用低功耗设计摆脱取电问题，可长达5年以上的带电使用，且可上传电池电量信息利于维护。
进一步地，如图2所示，温度检测电路3包括第一分压电路31、电压跟随电路32和mos管开关电路33；其中，TEMP_PWR和TEMPH_PWR分别接入第一MCU5引脚，第一MCU5可控制高低电平来控制mos管开关电路33，通过选择10千欧姆电阻R15、330欧姆电阻R16与热敏电阻R17组成第一分压电路。热敏电阻R17根据外界温度不同自身阻值不同的特性，根据欧姆定理会将温度的变化转化成热敏电阻R17两端电压变化。根据功率放大器特性组成电压跟随电路，TEMP_AD处电压就反映热敏电阻R17电压。TEMP_AD连接第一MCU5的ADC(模拟数字转换器)引脚，可算出电压值，根据电压和温度之间算法，从而算出温度值。第一MCU5芯片睡眠模式醒来，分别改变TEMP_PWR和TEMPH_PWR电平导通MOS管开关电路33，根据分压电路32和电压跟随电路31，通过TEMP_AD读取热敏电阻R17两端电压，算出当前温度。通过判断导通TEMP_AD和TEMPH_PWR两分压电阻的不同，可得到两温度值根据使用环境不同可选择想要的温度分辨率和范围。TEMP_PWR温度分辨率较小，温度采集范围较大。TEMPH_PWR温度 分辨率较大，温度采集范围较广。
进一步地，如图3所示，锂电池9电压测量电路采用第二分压电路，通过R10和R12对电池电压进行分压，根据欧姆定律可以通过R12电压算出电池电压，DC-BAT连接MCU ADC引脚，可读出R12电压。MCU睡眠模式苏醒，测量完温度后，读取R12电压，算出电池电压。
进一步地，所述主温度汇集单元13包括USB接口14、USB转串口15、第二MCU17、第二看门狗电路16、第二电源管理电路18、第二RF无线传输模块19和第二RF天线20；
第二RF无线传输模块19经第二RF天线20与所述第一RF天线4连接，第二RF无线传输模块19输出端与第二MCU17连接，第二MCU17输出经USB转串口15、USB接口14与所述主机12连接，第二MCU17输出与第二看门狗电路16连接；
USB接口14与第二电源管理电路18输入端连接，第二电源管理电路18的输出端分别与第二MCU17、第二看门狗电路16、第二RF无线传输模块19以及USB转串口15连接为其供电。
需要说明的是，主温度汇集单元13采用USB硬件接口，Modbus软件接口与主机12连接。使得主机12种类设置更加灵活，使用更加开放，可与包括电脑，手机，平板电脑，TTU(智能配变终端)，巡检机器人等拥有USB接口14的主机12进行连接，且主温度汇集单元13使用USB供电，通用便捷，降低使用难度。
其中，主温度汇集单元13采用主动上报和空中匹配两种工作方式进行交互，使用灵活，降低功耗，提高产品稳定性。
空中匹配模式如图6，从温度感知单元2进入睡眠超低功耗状态，睡眠周期到达，模块苏醒转化为工作状态，第一步进行看门狗喂狗，第二步进行温度传感器21温度测量，第三步进行电池电压检测，第四步将RF无线模块设置为接收模式，接收超时模块进入睡眠状态。接收模式过程中收到主温度汇集单元13读取信息，发送温度和电池电压信息 至温度汇集单元，模块进入睡眠状态。此模式适合移动物体抄读温度数据，如插入温度汇集单元的巡检机器人，插入温度汇集单元的手机，人为巡检等。
主动上报模式如图7，从温度感知单元2进入睡眠超低功耗状态，睡眠周期到达，模块苏醒转化为工作状态，第一步进行看门狗喂狗，第二步进行温度传感器21温度测量，第三步进行电池电压检测，第四步模块发送采集的被测物体1温度信息和锂电池9电量信息，发送完毕接收到主温度汇集单元13应答，模块进入低功耗睡眠模式。若未收到应答，模块继续发送直至超过重发次数，模块进入低功耗睡眠模式。此模式适合固定在从模块附近不移动主机12，如插入温度汇集单元的TTU，插入温度汇集单元的台式电脑等。
进一步地，如图4所示，第一看门狗电路11和第二看门狗电路16均包括看门狗芯片电路。电源管理电路给看门狗芯片供电，看门狗芯片开始工作。看门狗芯片WDI引脚连接MCU IO口(通用输入输出接口)，RESET连接MCU RESET引脚(复位引脚)，MCU定时给WDI一个脉冲信号进行喂狗，看门狗芯片获取喂狗信号，不对RESET引脚输出脉冲信号，不对MCU进行复位。如果MCU故障无法进行喂狗操作，看门狗芯片会输出脉冲信号，对MCU进行复位解除故障。
进一步地，如图5所示，第一电源管理电路8和第二电源管理电路18均包括3.3V低压差线性稳压器，第一电源管理电路8还包括2.5V基准稳压电路。第一电源管理电路83.3V低压差线性稳压器将电池电压稳定3.3V供锂电池9电压测量电路、看门狗电路、温度测量电路、RF无线传输模块、低功耗MCU使用。2.5V基准稳压电路供温度测量电路和电池电压测量电路做电压分压电源使用。并将基准电压输入MCU基准电压输入口。提供准确的ADC基准电压。第二电源管理电路183.3V低压差线性稳压器将USB接口14提供的电压转化成稳定的3.3V电压，供给USB转串口15电路，看门狗电路，RF无线传输电路，MCU使用。
本实施例还公开了一种无线测温系统的使用方法，包括空中匹配模式如下步骤：
从温度感知单元2中，第一MCU5对第一看门狗电路11进行操作，进行看门狗喂狗；
温度检测电路3将温度传感器21所采集的被测物体1的温度值保存在第一MCU5中，锂电池9电压测量电路测量锂电池9的电压并将电压保存至第一MCU5中；
将第一RF无线传输模块6设置为接收模式，并在接收模式过程中接收到主温度汇集单元13发送的读取信息指令，并根据读取信息指令将锂电池9的电压和被测物体1的温度值发送至主温度汇集单元13中，发送完毕后进入睡眠状态；
所述主温度汇集单元13将被测物体温度值和锂电池9电压存储在第二MCU17 Modbus表中以供主机12通过USB接口14使用Modbus规约读取。
还包括主动上报模式，如下步骤：
从温度感知单元2中，第一MCU5对第一看门狗电路11进行操作，进行看门狗喂狗；
温度检测电路3将温度传感器21所采集的被测物体的温度值保存在第一MCU5中，锂电池9电压测量电路测量锂电池9的电压并将电压保存至第一MCU5中；
第一MCU5经无线传输方式将被测物体的温度值和锂电池9电压发送至所述主温度汇集单元13并等待主温度汇集单元13应答后进入低功耗睡眠在状态；
所述主温度汇集单元13将被测物体温度值和锂电池9电压存储在第二MCU17 Modbus表中以供主机12通过USB接口14使用Modbus规约读取。
需要说明的是从温度感知单元2与主温度汇集单元13之间采用主 动上报和空中匹配两种工作方式进行交互，使用灵活，降低功耗，提高产品稳定性。
进一步地，在从温度感知单元2中，低功耗MCU一般处于低功耗睡眠模式，在到达苏醒时间进入苏醒模式，在苏醒模式下，低功耗MCU对第一看门狗电路11进行操作，以保证从温度感知单元2正常运行。在主温度汇集单元13中，第二MCU17间隔对第二看门狗电路16进行操作，保证程序的稳定运行。
进一步地，主机12根据获取的被测物体的温度值，可判断被检测设备使用温度，根据当前温度现场可判断设备当前运行状态，如温度过高设备可能异常，现场可对设备进行维修。
进一步地，主机12根据获取的锂电池9的电量信息，可判断当前从温度感知单元2电量情况，现场可根据从温度感知单元2电量情况进行维护，如低电量进行电池更换或者更换设备。
以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种无线测温系统，其特征在于，包括：主温度汇集单元和多个从温度感知单元，从温度感知单元与被测物体连接用于测量被测物体的温度，从温度感知单元与主温度汇集单元经无线方式连接以将采集的被测物体的温度发送至主温度汇集单元，主温度汇集单元与主机连接以将汇集的温度信息发送至主机。
  2. 如权利要求1所述的无线测温系统，其特征在于，所述从温度感知单元包括温度传感器、温度检测电路、第一MCU、第一电源管理电路、锂电池、锂电池电压测量电路、第一看门狗电路、第一RF无线传输模块和第一RF天线；
    温度传感器安装在所述被测物体上，温度传感器经温度检测电路与第一MCU连接，第一看门狗电路与第一MCU输出端连接，锂电池经锂电池电压测量电路与第一MCU的输入端连接，第一MCU的输出端经第一RF无线传输模块、第一RF天线与所述主温度汇集单元连接
    锂电池输出端与第一电源管理电路连接，第一电源管理电路分别与温度检测电路、第一看门狗电路、锂电池电压测量电路、第一MCU和第一RF无线传输模块连接为其供电。
  3. 如权利要求2所述的无线测温系统，其特征在于，所述第一MCU为低功耗MCU。
  4. 如权利要求2所述的无线测温系统，其特征在于，所述温度检测电路包括第一分压电路、电压跟随电路和mos管开关电路，第一分压电路输出与电压跟随电路连接，电压跟随电路和mos管开关电路均与所述第一MCU连接。
  5. 如权利要求2所述的无线测温系统，其特征在于，所述锂电池电压测量电路采用第二分压电路，第二分压电路包括电阻R10、R11和R12，电阻R11经插接件与电阻R10连接，电阻R12与电阻R10串联，电阻R12两端并联有电容C16，电容C16一端连接所述第一MCU的ADC引脚。
  6. 如权利要求2所述的无线测温系统，其特征在于，所述主温度汇集单元包括USB接口、USB转串口、第二MCU、第二看门狗电路、第二电源管理电路、第二RF无线传输模块和第二RF天线；
    第二RF无线传输模块经第二RF天线与所述第一RF天线连接，第二RF无线传输模块输出端与第二MCU连接，第二MCU输出经USB转串口、USB接口与所述主机连接，第二MCU输出与第二看门狗电路连接；
    USB接口与第二电源管理电路输入端连接，第二电源管理电路的输出端分别与第二MCU、第二看门狗电路、第二RF无线传输模块以及USB转串口连接为其供电。
  7. 如权利要求6所述的无线测温系统，其特征在于，所述第一看门狗电路和第二看门狗电路均采用看门狗芯片电路。
  8. 如权利要求6所述的无线测温系统，其特征在于，所述第一电源管理电路包括3.3V低压差线性稳压器和2.5V基准稳压电路，第二电源管理电路采用3.3V低压差线性稳压器。
  9. 一种无线测温系统的使用方法，其特征在于，包括：
    从温度感知单元中，第一MCU对第一看门狗电路进行操作，进行看门狗喂狗；
    温度检测电路将温度传感器所采集的被测物体的温度值保存在第一MCU中，锂电池电压测量电路测量锂电池的电压并将电压保存至第一MCU中；
    将第一RF无线传输模块设置为接收模式，并在接收模式过程中接收到主温度汇集单元发送的读取信息指令，并根据读取信息指令将锂电池的电压和被测物体的温度值发送至主温度汇集单元中，发送完毕后进入睡眠状态；
    所述主温度汇集单元将被测物体温度值和锂电池电压存储在第二MCU Modbus表中以供主机通过USB接口使用Modbus规约读取。
  10. 如权利要求9所述的无线测温系统的使用方法，其特征在于，还包括：
    从温度感知单元中，第一MCU对第一看门狗电路进行操作，进行看门狗喂狗；
    温度检测电路将温度传感器所采集的被测物体的温度值保存在第一MCU中，锂电池电压测量电路测量锂电池的电压并将电压保存至第一MCU中；
    第一MCU经无线传输方式将被测物体的温度值和锂电池电压发送至所述主温度汇集单元并等待主温度汇集单元应答后进入低功耗睡眠在状态；
    所述主温度汇集单元将被测物体温度值和锂电池电压存储在第二MCU Modbus表中以供主机通过USB接口使用Modbus规约读取。
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