Sammendrag
This paper explores electrostatic vibration energy
harvesters with power electronic interfaces that configure them
as Bennet’s doubler. We focus on in-plane overlap generators and
consider challenges arising from small capacitance variations due
to parasitic capacitances and the influence of diode parameters,
such as reverse current and p-n junction capacitance, on system
performance. The average charging current and initial bias
voltage can be estimated from simulation results. The dependence
of the minimum initial voltage on the storage capacitance is
determined. When delivering energy into a storage capacitor,
the voltage ultimately saturates due to the electromechanical
coupling and its value depends on input acceleration, drive
frequency, mechanical quality factor, and diode losses. The
minimum required initial bias is about ten mVs and can be
accomplished by choosing the value of the storage capacitor and
utilizing diode-configured transistors in integrated circuits.
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