Today we introduce a national invention patent for the invention - an oscillating temperature sensor that uses RF RF signals as energy. The patent was applied for by the 26th Research Institute of China Electronics Technology Group Corporation and was granted an authorization announcement on November 2, 2016.
　　 Description
　　 The invention belongs to the field of sensors, and in particular to an oscillating temperature sensor.
Background of the invention
　　 Power switch cabinets, transformers and high-voltage transmission lines play an important role in the high-voltage transmission industry. However, after long-term use, these devices may cause aging such as rust, which affects the electrical conductivity of the metal conductor, increases the resistance of the conductor, and generates heat under high pressure conditions. In the summer, the peak of power supply, high temperatures can cause fires and even explosions. In order to solve this problem, the best way is to install a temperature sensor in the position of the metal conductor inside the device, monitor the temperature change in real time, and cut off the power supply in case of abnormal temperature.
　　 However, installing the sensor inside the high-voltage device is limited in several ways: the sensor and the external receiving device cannot have a wire connection, otherwise it will cause creepage and breakdown of the external device and the sensor. Sensor maintenance should be as small as possible. The sensor is small enough to fit on the surface of the metal conductor.
　　 In order to solve the above limitations, there are currently two types of sensors mainly used: fiber grating sensors, SAWR passive surface acoustic wave sensors. The former sensor is very expensive (a set of around 100,000) and is rarely used in the domestic market. The latter sensor is small in size and requires no battery at all for passive and wireless. It is currently the ideal high temperature temperature sensor. The sensor consists of an antenna and a sound table resonator (ie the sensor head). The reader is used to transmit radio frequency signals, the antenna receives the RF signal of the reader, and excites the acoustic resonator, since the acoustic resonator itself can accumulate energy. When the surface resonator is saturated, energy is released in the form of radio waves, and a signal with frequency offset is automatically returned. The amplitude (ft) of the frequency offset of the signal is proportional to the temperature, and the reader receives the signal. The temperature is judged by the magnitude of the frequency offset. However, the sensor still has the following problems to be solved: the working distance of the sensor is close (less than 3 meters), so that the reader must be within a certain distance from the sensor head, which is inconvenient to use.
Summary of the invention
　　 In view of the above deficiencies of the prior art, the technical problem solved by the present invention is how to provide an oscillating temperature sensor with a long working distance and convenient use.
　　 In order to solve the above technical problem, the present invention adopts the following technical solution: an oscillating temperature sensor with an RF RF signal as an energy, including an antenna, an energy collecting module and a sensing head; the energy collecting module includes a matching circuit, the first two a pole tube and a power management circuit; the matching circuit includes a matching inductor and a matching capacitor, the matching capacitor is connected in parallel with the feed end of the antenna, and the matching inductor is connected in series between the feed end of the antenna and the anode of the first diode; the power management circuit includes a DC/DC boosting chip and an energy storage capacitor, the input end of the DC/DC boosting chip is connected to the cathode of the first diode, the load voltage output end of the DC/DC boosting chip is connected to the oscillating temperature sensor a live line connection, the storage voltage output end of the DC/DC boost chip is connected to the ground of the oscillating temperature sensor through an energy storage capacitor; the sensing head includes a surface acoustic resonator and a triode, and the base of the triode The output of the acoustic resonator is connected, the collector of which is connected to the live line of the oscillating temperature sensor, and the emitter of which is connected to the ground of the oscillating temperature sensor.
The figure shows the circuit diagram of the oscillating temperature sensor provided by the invention.
　　 As a further optimization of the above solution, an isolation capacitor is also connected in series between the matching inductor and the anode of the first diode. The energy harvesting module further includes a second diode, a cathode of the second diode being connected to an anode of the first diode, an anode of the second diode and a ground of the oscillating temperature sensor Wire connection. The DC/DC boost chip model is S882Z, the storage capacitor is 3.3uF, the matching inductor is 27nH~33nH, the matching capacitor is 1.5pF, and the first diode and the second diode are both HSMS7630. .
　　 Compared with the prior art, the present invention has the following advantages: the oscillating temperature sensor provided by the present invention, the acoustic table resonator and the triode combine to form a sound table oscillator, which can transmit a return signal with greater power and increase the sensor. Working distance. And using the RF energy harvesting technology to drive the sound table oscillator, the sensitivity of the energy harvesting module is -1 0d Bm, so that when the signal intensity (ER IP) received by the energy harvesting module is 20d Bm (915MHz), the energy harvesting module The working distance (that is, the distance between the reader and the sensor) is greater than 3 meters (greater than or equal to 10 meters), which increases as the power of the transmitted signal increases. Therefore, it works much farther than ordinary passive wireless sound meter sensors. The reader can read the sensor data at a long distance and is convenient to use.
　　 In addition, the oscillating temperature sensor provided by the invention selects the DC/DC boosting chip of the model S882Z, so that the time length of the returning signal of the surface acoustic oscillator is greater than 500 us, which far exceeds the working time of the ordinary passive acoustic meter sensor. . It can help simplify the signal receiving mode of the reader. The reader does not even need to use FFT conversion, and can accurately read the received signal frequency by directly counting the received signal with a low-cost MCU.
　　 Description
　　 The invention belongs to the field of sensors, and in particular to an oscillating temperature sensor.
Background of the invention
　　 Power switch cabinets, transformers and high-voltage transmission lines play an important role in the high-voltage transmission industry. However, after long-term use, these devices may cause aging such as rust, which affects the electrical conductivity of the metal conductor, increases the resistance of the conductor, and generates heat under high pressure conditions. In the summer, the peak of power supply, high temperatures can cause fires and even explosions. In order to solve this problem, the best way is to install a temperature sensor in the position of the metal conductor inside the device, monitor the temperature change in real time, and cut off the power supply in case of abnormal temperature.
　　 However, installing the sensor inside the high-voltage device is limited in several ways: the sensor and the external receiving device cannot have a wire connection, otherwise it will cause creepage and breakdown of the external device and the sensor. Sensor maintenance should be as small as possible. The sensor is small enough to fit on the surface of the metal conductor.
　　 In order to solve the above limitations, there are currently two types of sensors mainly used: fiber grating sensors, SAWR passive surface acoustic wave sensors. The former sensor is very expensive (a set of around 100,000) and is rarely used in the domestic market. The latter sensor is small in size and requires no battery at all for passive and wireless. It is currently the ideal high temperature temperature sensor. The sensor consists of an antenna and a sound table resonator (ie the sensor head). The reader is used to transmit radio frequency signals, the antenna receives the RF signal of the reader, and excites the acoustic resonator, since the acoustic resonator itself can accumulate energy. When the surface resonator is saturated, energy is released in the form of radio waves, and a signal with frequency offset is automatically returned. The amplitude (ft) of the frequency offset of the signal is proportional to the temperature, and the reader receives the signal. The temperature is judged by the magnitude of the frequency offset. However, the sensor still has the following problems to be solved: the working distance of the sensor is close (less than 3 meters), so that the reader must be within a certain distance from the sensor head, which is inconvenient to use.
Summary of the invention
　　 In view of the above deficiencies of the prior art, the technical problem solved by the present invention is how to provide an oscillating temperature sensor with a long working distance and convenient use.
　　 In order to solve the above technical problem, the present invention adopts the following technical solution: an oscillating temperature sensor with an RF RF signal as an energy, including an antenna, an energy collecting module and a sensing head; the energy collecting module includes a matching circuit, the first two a pole tube and a power management circuit; the matching circuit includes a matching inductor and a matching capacitor, the matching capacitor is connected in parallel with the feed end of the antenna, and the matching inductor is connected in series between the feed end of the antenna and the anode of the first diode; the power management circuit includes a DC/DC boosting chip and an energy storage capacitor, the input end of the DC/DC boosting chip is connected to the cathode of the first diode, the load voltage output end of the DC/DC boosting chip is connected to the oscillating temperature sensor a live line connection, the storage voltage output end of the DC/DC boost chip is connected to the ground of the oscillating temperature sensor through an energy storage capacitor; the sensing head includes a surface acoustic resonator and a triode, and the base of the triode The output of the acoustic resonator is connected, the collector of which is connected to the live line of the oscillating temperature sensor, and the emitter of which is connected to the ground of the oscillating temperature sensor.
The figure shows the circuit diagram of the oscillating temperature sensor provided by the invention.
　　 As a further optimization of the above solution, an isolation capacitor is also connected in series between the matching inductor and the anode of the first diode. The energy harvesting module further includes a second diode, a cathode of the second diode being connected to an anode of the first diode, an anode of the second diode and a ground of the oscillating temperature sensor Wire connection. The DC/DC boost chip model is S882Z, the storage capacitor is 3.3uF, the matching inductor is 27nH~33nH, the matching capacitor is 1.5pF, and the first diode and the second diode are both HSMS7630. .
　　 Compared with the prior art, the present invention has the following advantages: the oscillating temperature sensor provided by the present invention, the acoustic table resonator and the triode combine to form a sound table oscillator, which can transmit a return signal with greater power and increase the sensor. Working distance. And using the RF energy harvesting technology to drive the sound table oscillator, the sensitivity of the energy harvesting module is -1 0d Bm, so that when the signal intensity (ER IP) received by the energy harvesting module is 20d Bm (915MHz), the energy harvesting module The working distance (that is, the distance between the reader and the sensor) is greater than 3 meters (greater than or equal to 10 meters), which increases as the power of the transmitted signal increases. Therefore, it works much farther than ordinary passive wireless sound meter sensors. The reader can read the sensor data at a long distance and is convenient to use.
　　 In addition, the oscillating temperature sensor provided by the invention selects the DC/DC boosting chip of the model S882Z, so that the time length of the returning signal of the surface acoustic oscillator is greater than 500 us, which far exceeds the working time of the ordinary passive acoustic meter sensor. . It can help simplify the signal receiving mode of the reader. The reader does not even need to use FFT conversion, and can accurately read the received signal frequency by directly counting the received signal with a low-cost MCU.
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