本論文提出一群組非對稱脈波寬調變控制技術來消除螢光燈之輝紋及溫度計效應。群組非對稱脈波寬調變可以使螢光燈管在低亮度時的奇次諧波能量有效分佈在每一個諧波上，因此可以有效的來消除輝紋及溫度計效應。群組非對稱脈波寬調變電子安定器不僅可以操作在零電壓切換並且比傳統電磁式螢光燈之亮度多20%。本文內容也有詳盡的數學推導，分別分析螢光燈在群組非對稱脈波寬調變下的頻譜及對稱時的頻譜。本文利用串聯諧振並聯負載式半橋電子安定器之主電路架構，文中除了說明其動作原理，並探討對稱脈波與群組非對稱脈波下的數學推導，並提出一簡易的設計準則及應用實例。最後利用電腦模擬電路軟體IsSpice驗證所提理論之正確性，實驗結果證明本文所提之方案的確可將螢光燈調光範圍大幅擴展為1%~100%。

A signal processor for eliminating striation and thermostat effect in a fluorescent lamp by group-asymmetrical pulse-width-modulation (GAPWM) control strategy is explored. The proposed GAPWM can make the odd harmonic energies of the lamp current sharing on all the harmonics in low-level dimmer so as to eliminate striation and thermostat effect. Dimming by signal processing instead of by hardware, makes the control strategy easy to implement. A prototype of 80W GAPWM fluorescent lamp ballast is examined for assessing the theoretical investigation and practicality. The GAPWM ballast can be operated at ZVS and the lighting efficiency can be increased up to 20% compared with the traditional one. Besides, the fluorescent lamps can be dimmed without striation and thermostat effect during a wide range from 1% to 100% of the full luminance.

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