【摘要】：無極燈作為新一代電光源,具有壽命長、效率高、無頻閃等優(yōu)點(diǎn),是一種具有良好發(fā)展前途的新型氣體放電光源。由于無極燈具有負(fù)阻特性,需要鎮(zhèn)流器配合才能工作,因此在無極燈照明系統(tǒng)中,電子鎮(zhèn)流器的分析與設(shè)計(jì)至關(guān)重要。本文首先分析了無極燈的發(fā)光機(jī)理,比較了無極燈與其他電光源的優(yōu)缺點(diǎn),總結(jié)了無極燈電子鎮(zhèn)流器的發(fā)展趨勢。接著詳細(xì)介紹了無極燈電子鎮(zhèn)流器的電路結(jié)構(gòu)及分類,并結(jié)合無極燈的簡化電路模型,詳細(xì)分析了無極燈用諧振變換器工作原理以及軟開關(guān)工作情況,推導(dǎo)出諧振變換器在諧振工作狀態(tài)下各主要參量之間的相互關(guān)系。針對(duì)無極燈系統(tǒng)由于諧振參數(shù)發(fā)生變化導(dǎo)致固有諧振頻率偏移的問題,研究一種新型數(shù)字鎖相方法,通過鎖定半橋逆變器中點(diǎn)電壓與諧振電容電壓的相位差,使無極燈電子鎮(zhèn)流器工作頻率能夠準(zhǔn)確地跟蹤諧振回路的固有諧振頻率,解決了因電路固有諧振頻率偏移而導(dǎo)致無極燈無法正常工作的問題。以半橋中點(diǎn)電壓與諧振電容電壓的相位角作為鎖相控制變量,建立了DPLL的數(shù)學(xué)模型,詳細(xì)介紹了數(shù)字鎖相的工作原理以及硬件和軟件設(shè)計(jì)過程,并進(jìn)行了實(shí)驗(yàn)驗(yàn)證。分析了傳統(tǒng)無極燈調(diào)光方法存在的問題,在此基礎(chǔ)上提出一種改進(jìn)型PDM調(diào)光方法并將之與調(diào)頻調(diào)光方法相結(jié)合構(gòu)成新型的復(fù)合調(diào)光方案。詳細(xì)分析了該調(diào)光方案的調(diào)光原理及實(shí)現(xiàn)方法,并對(duì)所提出的調(diào)光方案進(jìn)行了仿真分析與實(shí)驗(yàn)驗(yàn)證,結(jié)果表明該調(diào)光方案具有調(diào)光精度高、調(diào)光范圍變大等優(yōu)點(diǎn)。采用單片機(jī)dsPIC33FJ16GS502作為主控制器,設(shè)計(jì)和制作了一臺(tái)可調(diào)光數(shù)字式無極燈電子鎮(zhèn)流器的原理樣機(jī),并進(jìn)行了實(shí)驗(yàn)測試,實(shí)驗(yàn)結(jié)果驗(yàn)證了所提的方案是可行的。
[Abstract]:As a new generation of electric light source, electrodeless lamp has the advantages of long life, high efficiency and no stroboscopic, so it is a new type of gas discharge light source with good development prospect. The analysis and design of electronic ballast is very important in the system of electrodeless lamp because of its negative resistance characteristic and the coordination of ballast. In this paper, the luminescence mechanism of the electrodeless lamp is analyzed, the advantages and disadvantages of the electrodeless lamp and other electric light sources are compared, and the development trend of the electronic ballast of the electrodeless lamp is summarized. Then, the circuit structure and classification of the electronic ballast of the non-electrode lamp are introduced in detail, and the working principle of resonant converter and the working condition of the soft switch are analyzed in detail, combined with the simplified circuit model of the non-electrode lamp. The relationship between the main parameters of the resonant converter in the resonant state is deduced. In order to solve the problem of inherent resonance frequency offset caused by the variation of resonant parameters, a new digital phase-locked method is studied. By locking the phase difference between mid-point voltage and resonant capacitor voltage of half-bridge inverter, a novel digital phase-locking method is proposed. The working frequency of the electronic ballast of the electrodeless lamp can accurately track the inherent resonant frequency of the resonant circuit, which solves the problem that the non-electrode lamp can not work properly due to the deviation of the inherent resonance frequency of the circuit. Taking the phase angle of half-bridge midpoint voltage and resonant capacitor voltage as the phase locked control variable, the mathematical model of DPLL is established. The working principle of digital phase-locking and the design process of hardware and software are introduced in detail. Based on the analysis of the problems in the traditional dimming method of electrodeless lamp, an improved PDM dimming method is proposed and combined with the FM dimming method to form a new compound dimming scheme. The dimming principle and realization method of the dimming scheme are analyzed in detail, and the simulation analysis and experimental verification of the dimming scheme are carried out. The results show that the dimming scheme has the advantages of high dimming precision and wide dimming range. Using dsPIC33FJ16GS502 as the main controller, the principle prototype of an adjustable light digital electronic ballast for electrodeless lamp is designed and manufactured. The experimental results show that the proposed scheme is feasible.
【學(xué)位授予單位】：福州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM923.61

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