低功耗高精度海洋压力采集系统设计

Low-power High-precision Marine Pressure Acquisition System Design

为解决当前在海洋环境中温度、压力等环境参数采集系统所存在的功耗大、续航差、体积大、安装维修困难、精度不高等问题,提出了一种低功耗、小型化、高精度、集成度高的压力采集系统方案。该系统以FPGA为主控芯片,模数转换模块采用PGA900芯片,结合低功耗设计方案使得系统在采集状态与睡眠状态之间灵活切换,大幅降低了系统功耗。数据回传时,将线性补偿后的压力值和温度值传输至上位机进行显示与分析。结果表明,系统在采集状态时的电流为5.37 mA左右,睡眠状态电流为149μA,温度信号和压力信号采集精度约为0.05%。该采集系统具备低功耗、高精度、便携特性,在一定程度上能满足高精度和海洋环境下长时间周期性工作的要求。

In order to solve the problems of large power consumption,poor endurance,large volume,difficult installation and maintenance,and insufficient accuracy in the current environmental parameter acquisition system such as temperature and pressure in marine environment,a pressure acquisition system scheme with low power consumption,miniaturization,high accuracy,and high integration level was proposed.The system used FPGA as the main control chip,and the analog-to-digital conversion module used PGA900 chip of TI company,combining with the low power consumption design scheme,the system can flexibly switch between the acquisition state and the sleep state,greatly reducing the power consumption of the system.When the data was returned,the pressure and temperature values corrected by the nonlinear compensation method were transmitted to the upper computer for display and analysis.The results show that the current of the system is about 5.37 mA in the acquisition state and 149μA in the sleep state,the acquisition accuracy of temperature and pressure signals is about 0.05%.The acquisition system has the characteristics of low power consumption,high precision and portability,and can meet the requirements of high precision and long-term periodic work in marine environment to a certain extent.