| With the advent of the "Internet Plus" era,the collection and transmission of information will be ubiquitous.In many application scenarios,the information to be collected needs to be transmitted to the relay node in a wireless manner,and then uploaded to the back-end center via the TCP/IP protocol,and then centrally processed by the background.However,in these scenarios,the wireless sensor nodes for information collection are powered by either batteries or passive energy.And in some cases,it is not easy to replace the battery.This imposes higher requirements on the energy consumption of the sensor node.Therefore,it is very important to study the low-power technology of wireless sensor nodes.Based on the need of the low power consumption of sensor nodes and temperature monitoring in distribution cabinets of smart distribution grid,this paper studies the low-power technologies of sensor nodes and temperature monitoring of switchgear.The paper introduces the general situation of wireless sensor network and the temperature monitoring of switchgear cabinet,and proposes a general switchgear temperature monitoring program.Analyze the low-power technology of sensor nodes from a strategic point of view,focusing on three aspects: low-power selection of sensor node core chip,power management,and low-power wireless communication protocol.Analyze the influence of the sleeping time,transmit power,etc.of the sensor node on power consumption.Taking the low power consumption of the sensor node as the goal,The method of transmit power control of sensor nodes,the quasi-synchronous polling strategy and the anti-collision design based on quasi-orthogonality are proposed.The optimization analysis and test verification of the core parameters are carried out.Finally,a case of temperature detection and transmission of the high and low voltage distribution cabinet in the smart distribution grid is designed.The test shows that the designed system completed the required functions very well.The research and test results show that the low power solution of wireless sensor nodes proposed in this paper has strong engineering application value and provides reference for other related applications. |
