本論文提出以數位化來實現群組非對稱脈波寬調變控制器，主要目的消除螢光燈在低亮度時所產生的輝紋現象、降低音頻干擾及簡化電路設計。本文利用單晶片控制器取代早期類比群組非對稱脈波寬調變控制器，所使用的程式介面是組合語言，爲的是能使此單晶片控制器更容易實現，使螢光燈在低亮度時燈管電流iLamp出現偶次諧波成份，藉此可消除低亮度時所產生的輝紋效應。本文利用現有的串聯諧振式半橋電子安定器為主電路架構，文中除了說明控制器的設計外，還有數學推導加以分析，再利用模擬軟體Matlab來驗證所提理論之正確性。最後在設計考量的部份，針對螢光燈在低亮度時，使用不同的非對稱脈波責任週期比，產生不同的偶次諧波比例，來對安定器調光的效能來做評估。實驗結果證明本文所提之方案的確能將螢光燈調光由0%~100%的亮度時，過程中不會產生輝紋現象。

This thesis proposes a technique in the process of digitization to realize a Group-Asymmetrical Pulse-Width-Modulation controller for eliminating the striation, dimishing the acoustic disturbance and simplifying the control circuits during the fluorescent lamp in low luminance. A single chip is used to replace the earlier analog controller which can make the even harmonics amplitudes appearing on the fluorescent lamp in low luminance, therefore the striation phenomenon is eliminated. And the single chip with assembler language will make the controller much easier to implement. A series-resonant inverter is used as the electronic ballast. Besides, the analysis is discussed in detail and the theoretical prediction will be verified by the simulation in this thesis. In the design consideration, it will simulate that the different asymmetrical pulse duty cycle ratio bring different even harmonics, which will make different dimming effects on the fluorescent lamp. The proposed ballast is examined that the fluorescent lamp really can be dimmed without the striation during the total dimming range of 0% to 100% by this control strategy.

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