Architectures for vibration-driven micropower generators

摘要: Several forms of vibration-driven MEMS microgenerator are possible and reported in the literature, with potential application areas including distributed sensing ubiquitous computing. This paper sets out an analytical basis for their design comparison, verified against full time-domain simulations. Most microgenerators classified as either velocity-damped resonant generators (VDRGs) or Coulomb-damped (CDRGs) a unified structure is provided these generator types. Reported shown to have operated at well below achievable power densities guides given optimising future devices. The also describes new class-the Coulomb-force parametric (CFPG)-which does not operate manner. For all three generators, expressions graphs showing dependence output on key operating parameters. optimization considers physical constraints such voltage limitation maximum minimum damping ratios. sensitivity each architecture source vibration frequency analyzed this shows that CFPG can be better suited than applications where likely vary. It demonstrated mechanical resonance particularly useful when amplitude small compared allowable mass-to-frame displacement. CDRG VDRG generate same but give performance above respectively. Both types unable mass frame displacement amplitude, case some applications. is, therefore, required