基于WSN的墒情监测节点双电源设计

摘要

保证无线传感器网络中的节点长期稳定工作的关键设计之一是节点的电源模块设计。为了解决这一问题，文中设计完成了一种基于WSN的城市绿地墒情监测节点的太阳能电池板和锂电池结合的节点双电源供电系统。该设计采用TI的BQ25504电源管理芯片，并在节点上对电源管理程序进行了优化，可为节点提供稳定的电源输出，理论上能将锂电池的寿命延长3～5年，使系统具有更长的生命周期。该电源模块设计扩展性强，可扩展应用于各种户外监测的无线传感器网络节点，如环境监测、精细农业等。测试结果表明，此电源模块设计满足为墒情监测节点提供长期稳定的5V和3.3V供电需求，达到了预期设计目标。%One of the keys to ensure that the long-term stability of wireless sensor network nodes is the design of power supply module.To solve this problem, a dual power supply of solar panels and lithium combined for urban green moisture monitoring node based on WSN was designed in this paper This design used TI's BQ25504 power management chip,and the power management pro-gram was optimized for the node to provide a stable power output.It can theoretically extend the life of lithium batteries for 3 to 5 years so that the system can have a longer life cycle.This module can extend to apply in a variety of outdoor wireless sensor network nodes,such as environmental monitoring,precision agriculture,etc.Test results show the module can provide long-term and stable design specifications of 5 V and 3.3 V power supply and satisfy the demands.