Maximization of the extracted power in resonant electromagnetic vibration harvesters applications employing bridge rectifiers

摘要: Abstract The capability of a resonant electromagnetic vibration harvester to provide power load, in given conditions, is usually quantified by considering the P OPT that can be transferred optimal impedance. In this paper it explained that, presence bridge rectifier between and DC instead necessary consider SUBOPT , its resistive load.  ≤ P represents more accurate estimate upper bound average tot actually load case placed particular, shown able roughly emulate resistance hence . By means suitable theoretical analysis, also demonstrated why how strongly depends on value voltage V 0 at output rectifier. Moreover, closed form * provided. Experimental results are reported discussed order validate findings. prototype has been used. values main parameters are: resonance frequency 16.2 Hz, max 0.25 mW (at amplitude equal 1 g), 1.2 V, coil resistance = 5720.4 Ω, inductance = 0.56 H.