| Summary: | 碩士 === 國立臺北科技大學 === 電能轉換與控制產業碩士專班 === 102 === The main purpose of this study is to design a vibratory energy-harvesting system and integrate it with a ZigBee wireless sensor module. The concept behind the vibratory energy-harvesting system is collecting mechanical vibration energy and transforming it into electrical energy, which can be used as a supplying power for any electronic device. Most of the available vibratory energy harvesters (VEHs) capture only minute amounts of energy, as a result external power supplies or battery are required as auxiliary power sources. This, thereby, reduces the practicality and convenience of VEHs. Besides the additional power consumption by the sensing modules, the energy generated by the piezoelectric material is a minimal of about 5 ~ 9mW making it inadequate for driving any general common electronic device. Therefore the goal of this study is study the application on low-power wireless sensor modules.
In this study, the Arduino LilyPad microcontroller is used in conjunction with a super capacitor to manage and control both the energy converted by the piezoelectric material and the data from the wireless sensor. However, this study uses four pieces of piezoelectric material for the 16.84 mW required by the microcontroller alone . The differences between input current of the piezoelectric material (on the μ level) and the maximum open-circuit voltage (multiples of 10V) makes it necessary to place energy storage, transmission circuit and a DC-DC converter at the front-end of the microcontroller for the control and protection of the input node. the microcontroller, control, energy saving (sleep mode) and data transmission process are achieved. As the system does not require any external power and batteries due to the adequate amount of power provided by the piezoelectric material, the objective of power self-sufficiency is achieved.
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