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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 presents a miniaturized piezoelectric vibration energy harvester that can generate over 1.5μW of average power at the frequency range of 9Hz to 19Hz under sinusoidal input acceleration of 1g. The harvester employs non-contact frequency up-conversion technique to excite two stages of generators, achieving wide-band low-frequency generating capability with a small size. The fabricated harvester...
This paper presents a nonlinear energy harvester that can be operated in a wide frequency range of tens of Hz, as a potential power supply for tire pressure monitoring systems (TPMS). Frequency up-conversion is achieved by a two-stage oscillator structure. The non-contact magnetic repulsive driving mechanism eliminates mechanical collision during operation, thereby improving efficiency and endurance...
This paper reports an electromagnetic shielded cantilever-tip microwave-probe for conductive-property imaging at micro/nano surface-area. Equipped with an ultra-sharp tip apex (<;50 nm), the probe features small conducting path resistance of Rs<;5Ω and conducting path-to ground capacitance of Ctip≈1pF. These optimal-designed parameters facilitate satisfactory spatial resolution and microwave-signal...
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