Design And Modifying Of Low-Power Scheme Of Smart Terminal Used In Coal Mine Based On Wi-Fi

Recent years, wireless smart terminals with all kinds of functions havemore and more pervasive application in coal mine. But these terminals with highenergy consumption cannot meet the demand of coal mine. Power consumptionbecomes one of the critical factors that restrict the development of terminals,because of worse and worse contradiction between more functions, whichrequiring higher communication that increases the CPU and communicationburden, and the limited power supplied by battery, which cannot provide longrunning time.Wireless communication system based on Wi-Fi and the consumptionmanagement mechanism of Wi-Fi protocol is studied. After analyzing theterminal’s low-power scheme, the additional energy consumption on the terminalis pointed out and a low-power smart terminal which can be used in Wi-Finetwork is designed. Two modified power-saving schemes are proposed in thisthesis respectively from communication and hardware side. On thecommunication side, Round-trip time (RTT) taken by beacon frame between APand server is estimated by modeling. Power consumption on the terminal can bereduced because the terminal can dynamically adjust the interval of monitoringbeacon frame to reduce its unnecessary waking. Simulation result shows that themodified energy efficiency is obviously higher than Wi-Fi energy managementmechanism in the same conditions. On the hardware side, a new form for powersupply, named as pulse power, is used on the catalytic sensor. Based on theprinciple of pulse power supply, a series of experimental is conducted to studythe effect of pulse frequency and duty cycle on the sensitivity of sensor.Feasibility and the best work frequency of pulse-power are worked out from theexperiment, which provides a reference for the further study of the pulse-powerapplication.