硅实验室能量收集参考设计的实践回顾

　　硅实验室能量收集参考设计的实践回顾

　　低功耗无线传感器在工业和医疗应用中越来越普遍，远程测量桥梁和建筑物的压力，甚至人类的心脏压力。传感器节点需要超低功耗，因为更换电池可能代价高昂，不切实际，甚至不可能。在这些应用中，环境能源的获取成为一个高度优先事项，甚至是必要的。如果你考虑这样的设计，硅实验室制造一个便宜的能量收集板，它既是概念的证明，也是设计你自己应用程序的跳板。

　　硅实验室的能量收集参考设计（见图1）由一个无线传感器节点和一个USB无线适配器组成。无线传感器节点是由太阳能电池供电，虽然有一个辅助输入，将允许电源来自其他能源采集的替代品，如热，压电或射频。传感器节点采用了Silicon Labs si1012a无线单片机测量温度，光照水平和收费水平，无线传输数据到EZRadioPRO®USB适配器，从而使用一个单独的Silicon Labs C8051F342单片机和4431无线电。这次审查将使董事会通过它的步伐，建议在无线传感器节点的能量收集源有意义。

　　The sensor node is powered entirely by a solar cell， with energy stored in an Infinite Power Solutions’ THINERGY™ thin-film battery with power management handled by Linear Technology’s LTC4071 regulator chip （see Figure 2）。 The system is designed for ultra-low power operation， with the Si1012 consuming only 50 nA when it is not transmitting data. The leakage current of the energy harvesting supply is approximately 3 µA， which can be overcome by as little as 50 lux shining on the solar cell. When the battery is fully charged， the system can operate for approximately seven days in total darkness or indefinitely when exposed to light. The system can operate using either indoor lighting （200 lux） or sunlight （10，000 lux）。 Silicon Labs puts the life expectancy of the sensor board at 15 years， over which time it can deliver 7000 mA-H.