Power processing issues for micro-power electrostatic generators
Bernard H. Stark,Paul D. Mitcheson,P. Miao,Timothy C. Green,Eric M. Yeatman,Andrew S. Holmes +5 more
- 20 Jun 2004
- Vol. 6, pp 4156-4162
TL;DR: In this article, a prototype generator for low frequency (human body) motion has been developed using a micro-machined (MEMS) implementation of an inertial generator based on a moving-plate capacitor.
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Abstract: For various monitoring and sensing applications it is desirable to power the electronics by scavenging energy from any locally available source. A prototype generator for low frequency (human body) motion has been developed using a micro-machined (MEMS) implementation of an inertial generator based on a moving-plate capacitor. The prototype generates pulses of 300 V on a 10 pF capacitor. This paper examines the design of a circuit and MOSFET device to convert this energy to a low voltage. Because of the very small charge involved, the effect of leakage and parasitic stored charge are important. A silicon-on-insulator design is proposed and is examined through physics based finite-element simulation. The overall effectiveness of the generation process is shown to be composed of several terms which are functions of system parameters such as generator flight time, device area and circuit inductance. It is shown that device area is a compromise between leakage current, charge storage and on-state voltage. It can, for a given generator and inductance, be optimised to provide the maximum energy yield.
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Citations
Mems inertial power generators for biomedical applications
P. Miao,Paul D. Mitcheson,Andrew S. Holmes,Eric M. Yeatman,Timothy C. Green,Bernard H. Stark +5 more
- 21 Aug 2006
TL;DR: In this paper, an inertial vibration scavenging micro-generator is described, which is suitable for biomedical applications and can operate over a wide range of excitation frequencies and amplitudes.
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Comparison of SOI power device structures in power converters for high-voltage, low-charge electrostatic microgenerators
TL;DR: In this paper, the authors examined alternative device topologies which may greatly increase the energy yield for a given system size by increasing both the generation efficiency and the conversion efficiency using physics-based finite element simulation.
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Analysis and Optimisation of MEMS Electrostatic On-Chip Power Supply for Self-Powering of Slow-Moving Sensors
Paul D. Mitcheson,Bernard H. Stark,P. Miao,Eric M. Yeatman,Andrew S. Holmes,Timothy C. Green +5 more
- 01 Sep 2003
TL;DR: In this article, the performance of on-chip motion-driven power generators designed to eliminate wire connections and batteries in embedded sensors is analyzed for large-amplitude, low-frequency and irregular motion.