Variable capacitors are key elements in electrostatic micro-power generators. In such devices inertial

forces are used to do work against the electric field of the capacitor, thereby converting mechanical

energy to electrical potential energy that can be extracted by a suitable circuit. Applications are

envisaged in portable, wearable or implantable electronic devices where body motion could provide

the mechanical energy source.-Variable　capacitors　are　key　elements　in　electrostatic　micro-power　generators.　In　such　devices　inertial

forces　are　used　to　do　work　against　the　electric　field　of　the　capacitor,　thereby　converting　mechanical

energy　to　electrical　potential　energy　that　can　be　extracted　by　a　suitable　circuit.　Applications　are

envisaged　in　portable,　wearable　or　implantable　electronic　devices　where　body　motion　could　provide

the　mechanical　energy　source.