摘要
可攜式或植入式醫療電子產品一直都朝著更輕巧的趨勢發展，但所能使用的時間長度卻受到電池容量的限制，因此若能利用人體的能量來自行發電，即可在缺乏電力的緊急情況時給予傷患者一線生機。 此研究的目的是利用呼吸氣流吹動風輪葉片以帶動微型電磁發電機的轉子來發出電力。此研究以覆蓋住口鼻的口罩收集呼吸氣流，設計流道與其進出氣口位置使呼吸時吸吐氣的雙向氣流均能以同一 方向推動葉片，而葉片輪轂經改良後能加速氣流使葉片轉速提升，發電機則改由齒輪帶動來優化線圈纏繞區域，提升輸出電壓。 此呼吸發電機構的葉片在每分鐘15公升流率下的轉速由每分鐘2100轉提升到2400轉；發電機在每分鐘2400轉的轉速下的開路峰值電壓由8伏提升至11伏；此呼吸發電機構在每分鐘15公升流率下搭配6000歐姆的負載電阻可產生5.51伏的輸出電壓、0.92毫安培的輸出電流與5.05毫瓦的輸出功率；利用泵浦模擬呼吸的雙向氣流時，可產生1.13伏的輸出電壓、0.19毫安培的輸出電流與0.21毫瓦的輸出功率。
並列摘要
Electronic medical devices have become smaller, lighter, cheaper and more portable. The working time of these devices are mostly limited by the capacity of batteries. If we were able to harvest electrical energy from human body, their usability can be extended to some emergency situations when public electricity supply and batteries are not available. The purpose of this study is to build a miniature electric generator powered by the air flow of breathing. The breathing air push a turbine blade to rotate a strong permanent radial magnet. This induces a voltage on coils wound around the rotating magnet as described by Faraday’s Law of induction. The turbine blade is enclosed in an airflow chamber with a shape like a tropical storm symbol. Since breathing air flow changes its direction repeatedly with the cycle of inhalation and exhalation, this chamber is specially designed to keep on pushing the blade in the same direction. To elevate the generating voltage, the coil bobbin is designed to have coils wound over the rotating center of magnet which increases the change of magnet flux. The rotation of radial magnet is driven by the turbine shaft using gears. When the turbine blade was pushed by nitrogen at a constant flow rate of 15 L/s, the rotational speed of turbine reached 2400 rpm. This generated an 11V of open circuit output voltage. The output voltage dropped to 5.51V when a 6000W resistance was added as an electrical load. The output current was 0.92mA, and the output power was 5.06mW. When the turbine was driven by a piston pump to simulate the breathing cycle, the output with 6000W of load became 1.13V and 0.19mA. This provided a output power of 0.21mW.