开发能量收集功率预算的建议

　　开发能量收集功率预算的建议

　　利用能源收集（EH）的所有操作电源的数据采集系统越来越受欢迎，由功率管理、能量存储、数据处理、传感器接口和无线无线电链路等极低功率组件组合而成。

　　然而，设计一个可行的能量收集系统是困难的，不仅需要大量使用节能组件。它需要仔细规划、分析操作序列和时序以及理解权衡，因为存在两种不同的、异步的、不相关的过程。首先，收集和储存能量随机团块（焦耳或腰臀比），这主要是一个随机过程；然后，支出的能量通过一套时间表，大多在短时间的功率（W）、速度的能源使用。当然，所使用的总能量必须小于你积累的能量，而峰值功率的需求必须在系统交付的能力之内。

　　How much energy， anyway？

　　It is simplistic but misleading to think that using harvested power as a source is obtaining “something for almost nothing.” First， both the amount of energy impinging on the transducer， and the amount it can actually produce is low， even if 100% efficient.

　　Second， the reality is that not only are most such sources sporadic， but also the transducers are very inefficient at converting the impinging energy into electrical energy， and this does not take into account losses within the electronics themselves. Generally， less than 10% of the energy reaching the transducer actually ends up in an energy-harvesting battery or supercapacitor for later use， whether the energy is from wind， solar， vibration， sound， RF， or thermal transducers. Table 1 shows some sample numbers. （Note： These are just order-of-magnitude approximations.）