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本文提出了一种自供电的压电能量采集系统，能够在30µW至10mW的宽功率范围内工作，并实现了9.09ms/V的最大功率点跟踪(MPPT)时间。该系统集成了高效的AC-DC和DC-DC转换器，解决了亚毫瓦级能量采集系统中MPPT速度慢和功率范围窄的问题。
Energy harvesting is a key technology in various small-size applications such as wireless sensor nodes, mobile devices, and implantable bio-devices to improve battery lifetime or to substitute for batteries. Piezoelectric (PE) transducers are popular energy harvesters that can be used to supply AC power at the μW to mW scale to electronic devices using ambient vibrational energy. To use PE energy effectively, the harvesting systems need a highly efficient AC-DC converter and a DC-DC converter with maximum power point tracking (MPPT). However, existing sub-mW converters do not include an integrated MPPT algorithm [1, 2] or use the perturb and observe MPPT method which has long tracking time [3, 4]. This long tracking time reduces the power extraction from the transducer because the maximum power point (MPP) of the input power can be changed frequently according to the environment. In this paper, a low-power harvesting
Minseob Shim, Jungmoon Kim, Junwon Jung, Chulwoo Kim
Korea University, Seoul, Korea