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This study presents a performance comparison of two green electrostatic energy harvesters based on force-sensitive mechanically variable capacitors. A startup battery is required in the conventional electrostatic energy harvester to precharge the mechanically variable capacitor. This adds an extra element to the device and increases the harvester's size and weight. The proposed harvester does not...
This paper presents an electrostatic harvester of vibration energy based on multiple variable capacitors. Conventional electrostatic energy harvesters rely on a single variable capacitor working when driven by vibrations of sufficient amplitude and frequency. The proposed harvester is suitable for applications with low vibration amplitude and frequency because it can start in lower vibration conditions...
This paper presents a green electrostatic harvester of vibration energy based on a mechanically-variable capacitor. Conventional electrostatic energy harvesters rely on a startup battery to precharge the variable capacitor. The proposed harvester operates in regenerative mode and provides a similar output power without the need for a startup battery. A battery-less prototype was developed using a...
In this paper, switching modulation schemes for Z-source converters used for renewable energy integration are investigated. Both dc-dc converters and dc-ac converters are discussed. Input/output voltage relationships for the two types of converters (half-bridge dc-dc and three-phase three-bridge dc-ac) are analyzed based on circuit analysis. The two converters are built and simulated in PSCAD. Simulation...
Electrostatic energy harvesters powered by ambient motion and integrated at the microscale are an attractive replacement for batteries in small, low-power electronic devices. This paper contains model and design considerations for electrostatic generators based on mechanically-variable capacitors. The performance of single-stage and multistage microgenerators are compared. The main design trade-offs...
This paper presents a charge pump based on voltage doublers, which can operate at very low input voltages. The proposed design uses dedicated boosting circuits and dynamic body biasing of the pass transistors. Driving capability, voltage gain, and conversion efficiency are demonstrated through simulations.
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