An energy harvester using a piezoelectric unimorph based heterostructure is presented to convert stray power-frequency (50 Hz or 60 Hz) magnetic field energy into electrical energy. The harvester consists a piezoelectric unimorph and a U-shaped mass structure. The U-shaped mass structure with two parallel bar magnets leads to a large rotary inertia for the given proof mass. An enhanced exciting torque is induced on the unimorph and the response of the harvester to the external magnetic field is strengthened. Under the resonant frequency of 50 Hz, the harvester produces a power of 154.6 mu W with a matching load resistance of 199 k Omega at a magnetic field of 0.5 Oe. Through an up-conversion management circuit, the energy harvester can successfully drive a wireless sensor node with high power consumption (90 mW at transmitting and 18 mW at receiving) at a duration of 205 ms.
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机译：提出了一种使用基于压电单压电晶片的异质结构的能量采集器，以将杂散功率频率（50 Hz或60 Hz）磁场能量转换为电能。收割机由压电单压电晶片和U形质量结构组成。对于给定的检验质量，带有两个平行条形磁体的U形质量结构导致较大的旋转惯性。在单压电晶片上感应出增强的激励扭矩，并且增强了收割机对外部磁场的响应。在50 Hz的共振频率下，采集器在0.5 Oe的磁场下产生154.6μW的功率，匹配的负载电阻为199 k Omega。通过上转换管理电路，能量采集器可以在205毫秒的时间内成功驱动高功耗（发射时90 mW，接收时18 mW）的无线传感器节点。
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