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This paper presents an electret based vibration energy harvester, which has excellent performance with both broad bandwidth and high normalized power density (NPD). Wafer-level MEMS fabrication process is proposed with detailed study on the packaging pressure and air damping effect. With an overall volume of about 0.187 cm3, the harvester can generate a maximum power of 4.95 μW with bandwidth of 12...
We have reported a prototype of wireless sensor node with ultra-low power consumption which has promising application on the temperature monitoring in central air conditioning system. Air-flow driven nanogenerators are utilized to harvest electric energy directly from the wind tunnel in a building. Using a microcontroller unit with event-driven strategy, the wireless sensor nodes can send out a temperature...
Presented in this paper is a novel kinetic energy-harvester that can autonomously sense sub-g acceleration-level vibration under non-power-supply situation. Only when the vibration-amplitude reaches the pre-set threshold, the device is switched on to generate electric energy, otherwise the device keeps idle. Asymmetric vertical magnetic-force coupling between two vibration stages is designed between...
This paper reports a novel piezoelectric energy-harvesting device that generates electric-power only when the concerned vibration level reaches a critical threshold. The threshold triggering function (equivalent to that of a sensing switch) is achieved by magnetic repulsive coupling between two vibratory stages (namely sensing-stage and generating-stage) integrated in the device. The threshold can...
This paper reports a fully self-powered wireless node for sensor-network that monitors the kinetic amount of mechanical vibration. The self powered sensing function is enabled by a newly developed energy-harvester that can generate considerable electric power only when the monitored amplitude of the vibratory acceleration reaches or exceeds a pre-set threshold. The generated electric-energy can be...
This study develops a piezoelectric vibratory energy harvester intended for wideband operation at low frequencies. The harvester features a two-stage vibratory structure. The first stage picks up ambient low-frequency vibration and excites the second stage to vibrate at its resonant frequency, thereby realizing frequency upconversion and improving power-generation capability. The first stage is designed...
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