Alisah, Mohamad Izudin (2016) Development Of Low Voltage Management Circuit For Low Frequency Vibration Energy Harvesting. Masters thesis, Universiti Sains Malaysia.
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Abstract
Kajian ini membentangkan pembangunan tenaga penuai getaran berfrekuensi rendah menggunakan penjana electromagnet dan litar pengurusan voltan untuk membekalkan kuasa kepada penderia tanpa wayar. Tujuan kajian ini adalah untuk menyelesaikan masalah apabila penderia kehabisan bekalan tenaga terutamanya pada unit yang dipasang pada struktur yang sukar diakses dan diselenggara. Memandangkan voltan dan kuasa yang dihasilkan bergantung pada frekuensi masuk, maka litar pengurusan voltan yang khusus diperlukan untuk mengawal dan menyimpan tenaga elekrik. Penjana elektromagnet difabrikasi menggunakan empat penggerak gegelung suara yang dibuat daripada magnet neodimium dan gegelung tembaga. Kuasa maksimum sebanyak 0.94, 3.3, 6.4 dan 15.5 mW dijana oleh penjana elektromagnet pada frekuensi 4 Hz, 6 Hz, 8 Hz dan 10 Hz pada tahap pecutan 3.5 m/s2. Nod penderia iaitu penganding suhu NI-WSN 3212 menggunakan sebanyak 9.5 mW ketika mod siap sedia, 42.1 mW ketika mod mengesan suhu dan 105.3 mW ketika mod menghantar data. Sumbangan utama kajian ini ialah pembinaan litar yang berupaya menukar voltan rendah serendah 0.24 V dan menjana kuasa sendiri tanpa memerlukan bekalan kuasa luar. Litar tersebut terdiri daripada pengganda voltan berambang rendah, LTC3105 penukar peningkat dan kapasitor besar sebagai penyimpan tenaga. Tenaga yang disimpan berupaya untuk membekalkan tenaga kepada penderia tanpa wayar ketika mod penghantaran data iaitu sebanyak 3300 dan 2100 kitaran bagi setiap bacaan sampel 5 saat dan 1 saat. Kesimpulannya, integrasi antara penjana elektromagnet dan litar pengurusan voltan yang dibina berjaya membekalkan tenaga untuk menghidupkan NI-WSN 3212. ________________________________________________________________________________________________________________________ This research presents a development of a low frequency vibration energy harvesting based on electromagnetic harvester with voltage management circuit to power up wireless sensor nodes. This is important for cases where the sensors have no consistent energy supply especially at installations where access is difficult. Since the generated voltage and power are strongly dependent on the input frequency, it is necessary to have specific low voltage management circuit to condition and store the electrical energy. The electromagnetic harvester consists of four voice coil actuators made of neodymium magnet and copper coils. Maximum power output of 0.94, 3.3, 6.4 and 15.5 mW were generated by the harvester for frequency of 4 Hz, 6 Hz, 8 Hz and 10 Hz at acceleration level of 3.5 m/s2. The sensor node based on NI-WSN thermocouple input consumed 9.5 mW during standby mode, 42.1 mW when temperature sensing and 105.3 mW during data transmission mode. The main contribution of this research is the circuit which can rectify low voltage as low as 0.24 V and requires no external power supply to operate. It comprises of low threshold diode voltage multiplier, LTC3105 boost converter and supercapacitor as storage energy. The stored energy was enough to power up the sensor node transmission for 3300 and 2100 cycles when connected to sensor node for every 5 s and 1 s reading samples. The integration of the electromagnetic harvester and voltage management circuit constructed has successfully powered the NI-WSN 3212.
| Item Type: | Thesis (Masters) |
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| Additional Information: | Full text is available at http://irplus.eng.usm.my:8080/ir_plus/institutionalPublicationPublicView.action?institutionalItemId=3103 |
| Subjects: | T Technology T Technology > TJ Mechanical engineering and machinery > TJ1-1570 Mechanical engineering and machinery |
| Divisions: | Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Mekanikal (School of Mechanical Engineering) > Thesis |
| Depositing User: | Mr Mohd Jasnizam Mohd Salleh |
| Date Deposited: | 30 Aug 2018 08:47 |
| Last Modified: | 30 Aug 2018 08:47 |
| URI: | http://eprints.usm.my/id/eprint/41611 |
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