- 學位論文
單級高功因電子安定器之電磁干擾雜訊防制
Electromagnetic Interference Noise Suppression for Single-Stage High Power-Factor Electronic Ballast
摘要
電子安定器採用高頻換流器來驅動螢光燈管，以改善照明品質及延長燈管壽命，而單級式電子安定器則能夠同時兼顧高效率與高功因特性。然而，此類單級式電子安定器由於操作在不連續電流模式，將導致嚴重的電磁干擾雜訊問題。由於電子產品設計過程中，必須能夠通過符合傳導性電磁干擾雜訊規範的相關測試。EMI濾波器因此廣泛地被使用於電子安定器之電源端來抑制傳導性電磁干擾雜訊。本論文建置一套以個人電腦為基礎之自動化電磁干擾雜訊量測與濾波器設計系統，能夠將火線與中性線的共模和差模雜訊，分別加以量測與儲存。並自動化設計出合適的濾波器元件，以降低傳導性電磁干擾雜訊強度，避免採用試誤法而導致人力、物力的浪費。此外，本論文更應用頻率調變技術，有效地降低EMI濾波器所無法濾除之高頻電磁干擾雜訊。最後，一部能夠驅動18W PL燈管之電子安定器被當做待測物，以驗證所提出方法的可行性，結果令人滿意。
並列摘要
Using high frequency inverters as the electronic ballast for driving fluorescent lamps can improve the light quality and prolong the lifetime of these lamps. High efficiency and unity power factor can be achieved simultaneously by a single-stage electronic ballast. However, the discontinuous current mode (DCM) operation for the single-stage electronic ballast generates serious electromagnetic interference (EMI) emission. Tests for complying with conducted emission limits are usually carried out during the electrical products design process. EMI filters are widely used for filtering excessive conducted emissions on the power cord for electronic ballasts. In this thesis, a PC-based automatic EMI measurement and filter design system is presented. The common-mode (CM) and differential-mode (DM) emissions in the live or neutral line can be measured and recorded separately. The trial-and-error guess work in selecting the filter components can be minimized by the presented automatic filter design system. In addition, a frequency modulation technique is also adopted for reducing high frequency electromagnetic interference emission that EMI filter cannot eliminate effectively. A laboratory electronic ballast for driving 18W PL lamp is used the equipment under test (EUT) to verify the feasibility of the proposed scheme. The results are satisfactory.