基于射频能量采集的电子标签设计方法

根据能量采集应用于标签的特点，在能量采集模块与标签模块之间添加监测电路，并在高低2个阈值设置的基础上，提出能量采集与标签协同工作策略，低阈值选取原则是保证储能模块的储能能够保证标签一次广播，最大限度地防止标签进入掉电状态. 从标签设计目标要求的广播间隔与功率出发，根据环境中能够采集到的能量大小与标签不同状态下所需能耗的变化，推导出储能电容最优值、环境中应具备的射频(RF)输入功率最小值与最优值. 利用P2110B与CC2640R2F芯片设计了一个基于射频采集的标签进行验证，测试结果表明：采取该方法设计的能量采集标签可以实现能量采集模块和标签模块协同工作，当射频输入功率大于最优值时，标签能够进行持续的“休眠 ? 广播”循环工作，有效地防止标签陷入“能量死锁”，并可自适应地在不同工作状态下转换.

Design method of electronic tag based on radio frequency energy acquisition

According to the characteristics of energy acquisition applied to tags, a monitoring circuit was added between the energy acquisition module and the tag module, and the cooperative working strategy of energy acquisition and tags was put forward based on the setting of high and low thresholds. The low threshold selection principle is to ensure that the energy storage of the energy storage module can ensure the one-time broadcasting of the tag and prevent the tag from entering the power down state to the maximum extent. The optimal value of energy storage capacitance, minimum and optimal radio frequency (RF) input power in the environment were deduced by starting from the broadcast interval and power required in the tag design goal according to the amount of energy that can be collected in the environment and the change of energy consumption required by the tag in different states. A tag based on RF acquisition was designed by using P2110B and CC2640R2F chip for verification. Test results show that the energy acquisition tag designed by this method can realize the cooperative work of energy acquisition module and tag module. The tag can carry out continuous “sleep and broadcast” cycle when the RF input power is greater than the optimal value. It can effectively prevent the label from falling into “energy deadlock”, and can adaptively switch in different working states.