IEEE Trans Biomed Circuits Syst. 2010 Dec;4(6):400-9. doi: 10.1109/TBCAS.2010.2077288.
A fundamental problem that miniaturized systems, such as biomedical implants, face is limited space for storing energy, which translates to short operational life. Harvesting energy from the surrounding environment, which is virtually a boundless source at these scales, can overcome this restriction, if losses in the system are sufficiently low. To that end, the 2-μm bi-complementary metal-oxide semiconductor switched-inductor piezoelectric harvester prototype evaluated and presented in this paper eliminates the restrictions associated with a rectifier to produce and channel 30 μW from a periodic 72- μW piezoelectric source into a battery directly. In doing so, the circuit also increases the system's electrical damping force to draw more power and energy from the transducer, effectively increasing its mechanical-electrical efficiency by up to 78%. The system also harnesses up to 659 nJ from nonperiodic mechanical vibrations, which are more prevalent in the environment, with 6.1±1.5% to 8.8±6.9% of end-to-end mechanical-electrical efficiency.
小型化系统（如生物医学植入物）面临的一个基本问题是储能空间有限，这导致其运行寿命较短。如果系统损耗足够低，从周围环境中获取能量可以克服这一限制，因为在这些尺度上，环境能量几乎是无限的。为此，本文评估并展示了 2-μm 双互补金属氧化物半导体开关电感器压电俘能器原型，该原型消除了与整流器相关的限制，可直接从周期性 72-μW 压电源产生并输送 30μW 的功率至电池。通过这种方式，该电路还增加了系统的电阻尼力，从而从换能器中汲取更多的功率和能量，有效地将其机电效率提高了 78%。该系统还可从更常见于环境中的非周期性机械振动中获取高达 659nJ 的能量，其端到端机电效率可达 6.1±1.5%至 8.8±6.9%。
