Most maximum power point trackers (MPPTs) for electromagnetic energy harvesters (EMEHs) are based on resistive matching technology, where the input resistance of the MPPT is made equal to the magnitude of the output impedance of the harvester. This is valid when the output reactance of the EMEH is much smaller than its output resistance. However, some EMEHs, such as permanent magnet generator, have nonnegligible output reactance. The discrepancy between the power extracted by the resistive matching technology and the maximum extractable power will increase as the output reactance increases. Under high excitation frequency and low operating temperature, the effect of the output reactance will become more dominant. In order to deal with such issue, an MPPT that can counteract the effect of the coil inductance and match with the coil resistance is presented. It does not require knowing coil parameters a priori and the harvester will be operated at its true maximum power point. A 7-W prototype for testing the proposed algorithm has been built and evaluated. Its performance is favorably compared with the amount of power extracted with the resistive matching technology.

中文翻译：

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用于在缓慢变化条件下运行的具有不可忽略输出电抗的电磁能量收集器的 MPPT

大多数用于电磁能量采集器 (EMEH) 的最大功率点跟踪器 (MPPT) 都基于电阻匹配技术，其中 MPPT 的输入电阻等于采集器输出阻抗的大小。当 EMEH 的输出电抗远小于其输出电阻时，这是有效的。然而，一些 EMEH，例如永磁发电机，具有不可忽略的输出电抗。电阻匹配技术提取的功率与最大可提取功率之间的差异会随着输出电抗的增加而增加。在高励磁频率和低工作温度下，输出电抗的影响将更加显着。为了处理这样的问题，提出了可以抵消线圈电感影响并与线圈电阻匹配的 MPPT。它不需要事先知道线圈参数，并且收割机将以其真正的最大功率点运行。已经建立并评估了用于测试所提出算法的 7-W 原型。与使用电阻匹配技术提取的功率量相比，其性能更胜一筹。