Power processing issues for micro-power electrostatic generators

BH Stark, PD Mitcheson, P Miao, TC Green, EM Yeatman, AS Holmes

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

12 Citations (Scopus)


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.
Translated title of the contributionPower processing issues for micro-power electrostatic generators
Original languageEnglish
Title of host publicationIEEE 35th Annual Power Electronics Specialists Conference, PESC 2004, Aachen, Germany, 20-25 June
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages4156 - 4162
Number of pages7
ISBN (Print)0780383990
Publication statusPublished - Jun 2004

Bibliographical note

Conference Organiser: IEEE
Other identifier: 9780780383999


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