具有PWM調(diào)光功能的無電解電容LED照明驅(qū)動研究
本文關(guān)鍵詞:具有PWM調(diào)光功能的無電解電容LED照明驅(qū)動研究 出處:《西南交通大學(xué)》2017年碩士論文 論文類型:學(xué)位論文
更多相關(guān)文章: LED照明 低頻紋波 無電解電容 PWM調(diào)光 Flyback AC/DC變換器 準(zhǔn)諧振
【摘要】:電解電容是影響LED照明驅(qū)動壽命的主要元件,因此,電解電容消除技術(shù)成為LED照明驅(qū)動研究的熱點。傳統(tǒng)的AC/DC LED照明驅(qū)動一般采用AC/DC變換器級聯(lián)LED電流調(diào)節(jié)器的兩級架構(gòu),雖然能夠消除電解電容,實現(xiàn)恒流輸出,但存在電路復(fù)雜、成本高、效率低等問題。同時,為了實現(xiàn)進(jìn)一步能量節(jié)省和適應(yīng)不同的應(yīng)用需求,PWM調(diào)光功能已成為LED照明驅(qū)動必備功能之一。為此,論文以基于低頻紋波對消技術(shù)的準(zhǔn)單級LED照明驅(qū)動架構(gòu)為研究對象,研究具有PWM調(diào)光功能的無電解電容LED照明驅(qū)動。目前低頻紋波對消技術(shù)僅研究了單串LED負(fù)載的情況,無法直接應(yīng)用于多串LED負(fù)載,且未實現(xiàn)PWM調(diào)光功能。論文以此為切入點,系統(tǒng)討論了前級FlybackAC/DC變換器和后級非隔離DC-DC變換器(重點考慮Buck變換器拓?fù)?的拓?fù)溥B接方式以及PWM調(diào)光下系統(tǒng)參數(shù)的設(shè)計;诘皖l紋波對消技術(shù)的LED照明驅(qū)動中前級AC/DC變換器通常采用CRM FlybackAC/DC變換器,存在在全負(fù)載范圍和線周期內(nèi)開關(guān)管開關(guān)頻率變化范圍較寬,開關(guān)損耗大,變換器效率低的問題。將準(zhǔn)諧振技術(shù)引入具有功率因數(shù)校正功能的FlybackAC/DC變換器,通過加入開關(guān)管最小關(guān)斷時間Toff_min控制,在實現(xiàn)主開關(guān)管谷值開通的同時,減小了開關(guān)頻率的變化范圍,降低了開關(guān)損耗,提高了變換器的效率。詳細(xì)分析了準(zhǔn)諧振Flyback AC/DC變換器的工作原理、功率因數(shù)PF和控制策略。以兩串LED負(fù)載為例,詳細(xì)闡述了低頻紋波對消架構(gòu)中Bus電壓的選取原則,分別給出了前級Flyback AC/DC變換器和后級Floating Buck變換器電路參數(shù)設(shè)計。實驗室研制了兩臺40W的原理樣機,實驗結(jié)果驗證了方案的可行性和設(shè)計的合理性。
[Abstract]:Electrolytic capacitor is the main component, LED lighting driving life so eliminating electrolytic capacitor technology has become a hotspot to drive LED lighting. The traditional AC/DC LED lighting driver two using AC/DC converter cascaded LED current regulator architecture, although can eliminate the electrolytic capacitor, constant current output, but the existence of complex circuit high cost and low efficiency. At the same time, in order to achieve further energy saving and adapt to the needs of different applications, PWM dimming function has become one of the essential functions of LED lighting. This paper based on low frequency ripple cancellation technology of quasi single stage LED lighting driver architecture as the research object, no electrolytic capacitor LED lighting driver is studied PWM dimming function. The low-frequency ripple cancellation of only a single strand of LED load, can not be directly applied to the series LED load, and did not realize the PWM dimming function based on. This is the starting point of the system, discussed the first level FlybackAC/DC converter and a non isolated DC-DC converter (Buck converter topology is focus on the design of system parameters) topology connection and PWM dimming. The low frequency ripple cancellation technology of LED lighting in the first stage AC/DC converter usually adopts CRM FlybackAC/DC transform based on the existing in the full load range and line cycle switching frequency range is relatively wide, large switching loss, low efficiency of the converter. The quasi resonant technology into FlybackAC/DC converter with power factor correction function, by adding minimum switch off time Toff_min control, opened at the same time in the realization of value the main switch Valley, reduces change range of switching frequency, reducing the switching losses and improve the efficiency of the converter. A detailed analysis of the working principle of Flyback quasi resonant AC/DC converter, power Factor PF and control strategy. In the two series LED load as an example, elaborated on the selection principle of eliminating low frequency ripple voltage of Bus in the architecture are given, the former Flyback AC/DC converter and Floating stage Buck converter circuit parameter design. The principle prototype of two 40W was developed. The experimental results verify the rationality the feasibility and design scheme.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM46;TM923.34
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