A Coil Connection Switching Strategy for Maximum Power Delivery in Electromagnetic Vibration Energy Harvesting System

Hongfei Xiao, Han Peng, Jiayong Yuan
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引用次数: 1

Abstract

Maximum Power Point Tracking (MPPT) approaches have been widely applied in energy harvesting systems. However, such control algorithms such as Perturb-and Observe (P&O) method usually require DSP or customized control ICs. This leads to high power consumption and high cost. This paper proposes a novel strategy to realize max. power delivery through coil connection switch approach where the input impedances and voltage/current levels are adjusted according to different output voltages. A single stage AC-DC dual boost converter is employed with fixed duty cycle to charge a super-capacitor load to verify the concept. Three sets of harvester coils are used and are connected in either parallel or series. The switch of coil connections is realized through isolated analog switches. It is demonstrated that the harvester with dual boost converter under proposed strategy achieves an maximum output power of 3.628 mW in 0.2 g acceleration, which is 41.7% higher than same converter without coil connection switching. With proposed method, the output power reaches to 98.7% of the output power with traditional P&O MPPT strategy. It also achieves higher efficiency and more compact system size than traditional P&O MPPT.
电磁振动能量收集系统中最大功率输出的线圈连接切换策略
最大功率点跟踪(MPPT)方法在能量收集系统中得到了广泛应用。然而,这种控制算法,如摄动和观察(P&O)方法通常需要DSP或定制的控制ic。这导致了高功耗和高成本。本文提出了一种实现最大化的新策略。通过线圈连接开关方式供电,根据不同的输出电压调整输入阻抗和电压/电流水平。采用固定占空比的单级交直流双升压变换器对超级电容负载进行充电以验证该概念。使用三组收割机线圈,并以并联或串联方式连接。线圈连接的切换是通过隔离的模拟开关来实现的。结果表明,在0.2 g加速度下,双升压变换器的最大输出功率为3.628 mW,比无线圈连接开关的相同变换器提高41.7%。采用该方法,输出功率达到传统P&O MPPT策略输出功率的98.7%。它还实现了比传统P&O MPPT更高的效率和更紧凑的系统尺寸。
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