螢光燈電子安定器具無條紋現象之調光設計

Abstract

此論文目的是提出一個「奇對稱責任周期控制」的新型螢光燈電子安定器，此架構可以達成高效率的調光和改善燈管操作在低亮度時所產生的條紋現象。此演算法是透過定頻控制，直接增加或減少基本波振幅來調節燈管亮度，而非傳統透過調頻控制做燈管的調光控制。奇對稱責任周期控制在降低基本波含量用以降低亮度的同時會增加偶數次諧波的含量，尤其是二次諧波的含量，因此可以有效的阻止條紋現象的產生。本文電路採串並聯諧振轉換器設計，可以達到零電壓切換提高操作效率，且不會如傳統並聯諧振電路在調光功率變動時諧振點和負載阻抗會大幅度的偏移。文中將會以數學模式分析，最後以奇對稱責任周期控制的演算法實際製作一個具有高效率並達到調光功能的螢光燈電子安定器。 文中將會探討不同的調光控制方法，並加以數學模式分析和軟體模擬，最後以奇對稱責任周期控制的演算法實際製作一個具有高效率並達到調光功能的螢光燈電子安定器。

The objective of this paper is to propose an novel fluorescent lamp ballast which is controlled by odd symmetrical duty-cycle control method. The proposed ballast can reach a highly efficient dimming and improve the striation of lamp when it operates at low luminance. When decrease the fundamental wave amplitude to decrease the luminance of lamp, odd symmetrical duty-cycle control method will increase the component of even harmonic wave simultaneously, especially for 2nd harmonic wave. Therefore it can effectively interrupt the generation of striation. The proposed ballast will not contain hiding dc current, so it will not produce unbalanced operation of switches. The circuit is designed in resonant inverter and operates at continuous conduction mode, so it can achieve zero voltage switching and reach high efficiency. Different dimming methods will be discussed by using mathematical model and simulation software. At last the practical fluorescent lamp dimming electronic ballast controlled by odd symmetrical duty-cycle control method will be realized.