【摘要】：無(wú)極燈作為新型氣體放電光源,具有壽命長(zhǎng)、效率高、無(wú)頻閃等優(yōu)點(diǎn),廣泛應(yīng)用于大范圍照明領(lǐng)域尤其是工礦、隧道等不方便換燈的場(chǎng)所。由于無(wú)極燈具有負(fù)阻特性,需要與鎮(zhèn)流器配合才能正常工作。因此,無(wú)極燈電子鎮(zhèn)流器的分析與設(shè)計(jì)至關(guān)重要。本文以無(wú)極燈電子鎮(zhèn)流器作為研究對(duì)象,結(jié)合無(wú)極燈的負(fù)載特性,對(duì)無(wú)極燈電子鎮(zhèn)流器的電路結(jié)構(gòu)、負(fù)載匹配、諧振特性和參數(shù)設(shè)計(jì)以及頻率跟蹤與調(diào)光控制策略等關(guān)鍵問(wèn)題進(jìn)行了系統(tǒng)深入的研究。主要包括以下內(nèi)容：本文首先介紹了無(wú)極燈的負(fù)載特性以及與之配套的電子鎮(zhèn)流器的電路結(jié)構(gòu)和工作原理,由此引出了兩種不同結(jié)構(gòu)的諧振變換器電路與無(wú)極燈負(fù)載進(jìn)行匹配的關(guān)鍵問(wèn)題。根據(jù)無(wú)極燈在不同工作階段的負(fù)載特性,對(duì)無(wú)極燈從啟動(dòng)到穩(wěn)定工作期間不同結(jié)構(gòu)諧振變換器輸出特性進(jìn)行了詳細(xì)分析與數(shù)學(xué)推導(dǎo),得到了適合于不同無(wú)極燈負(fù)載特性的電路結(jié)構(gòu)匹配方案。通過(guò)分析三階和四階無(wú)極燈用諧振變換器的電路特性,推導(dǎo)出了諧振變換器固有諧振頻率的表達(dá)式,該表達(dá)式考慮了負(fù)載變化對(duì)固有諧振頻率的影響。結(jié)合無(wú)極燈特殊的負(fù)載特性,提出了優(yōu)化諧振參數(shù)的設(shè)計(jì)思路。從不同燈功率、燈啟動(dòng)、負(fù)載突變、燈穩(wěn)態(tài)工作時(shí)最大功率輸出以及逆變器工作狀態(tài)等多方面考慮,針對(duì)三階和四階諧振變換器分別提出了一種兼顧點(diǎn)燈高壓、最大功率輸出以及開(kāi)關(guān)管零電壓開(kāi)通(ZVS)限定條件的電子鎮(zhèn)流器諧振參數(shù)設(shè)計(jì)方法,并通過(guò)研制不同功率的原理樣機(jī)進(jìn)行了實(shí)驗(yàn)驗(yàn)證。針對(duì)無(wú)極燈系統(tǒng)存在的固有諧振頻率漂移問(wèn)題,提出一種頻率跟蹤數(shù)字控制方案。通過(guò)分析諧振狀態(tài)下諧振回路各參量之間的相位關(guān)系,采用相位差閉環(huán)反饋實(shí)現(xiàn)對(duì)諧振回路固有諧振頻率的跟蹤。針對(duì)調(diào)光控制,提出兩種調(diào)光策略：脈沖密度調(diào)制(PDM)與脈沖頻率調(diào)制(PFM)相結(jié)合以及改進(jìn)型脈沖密度調(diào)制與脈沖頻率調(diào)制相結(jié)合的調(diào)光策略。兩種調(diào)光策略均克服了PFM調(diào)光范圍不寬的缺陷,又解決了PDM呈有級(jí)調(diào)光的不足,實(shí)現(xiàn)了無(wú)電極熒光燈平滑寬范圍調(diào)光和穩(wěn)定可靠工作。研制了一臺(tái)100W的原理樣機(jī),實(shí)驗(yàn)結(jié)果驗(yàn)證了所提方案的有效性。針對(duì)電子鎮(zhèn)流器在大功率無(wú)極燈照明場(chǎng)合的應(yīng)用,提出了一種可用作大功率無(wú)極燈電子鎮(zhèn)流器的多相并聯(lián)諧振變換器,分析了該變換器的工作原理以及電路特性。在此基礎(chǔ)上提出一種移相與鎖相相結(jié)合的控制策略,實(shí)現(xiàn)了對(duì)無(wú)極燈的調(diào)光控制,并使變換器能在同相驅(qū)動(dòng)和移相調(diào)光過(guò)程中始終工作在諧振回路固有諧振點(diǎn)附近,避免了因負(fù)載等效參數(shù)發(fā)生變化導(dǎo)致固有諧振點(diǎn)漂移對(duì)系統(tǒng)帶來(lái)不利影響,確保變換器穩(wěn)定可靠工作。詳細(xì)分析了移相角度對(duì)開(kāi)關(guān)管軟開(kāi)關(guān)的影響情況,推導(dǎo)出了移相過(guò)程各相電流、功率、環(huán)流以及燈輸出功率與移相角度之間的關(guān)系。最后研制了一臺(tái)460W的電子鎮(zhèn)流器原理樣機(jī),實(shí)驗(yàn)結(jié)果表明所提方案是可行的。
[Abstract]:As a new type of gas discharge light source, the electrodeless lamp has the advantages of long life, high efficiency and no stroboscopic. It is widely used in a wide range of lighting fields, especially in industrial and mining areas, tunnels and other places where it is not convenient to change lights. This paper takes the electrodeless lamp electronic ballast as the research object, and combines the load characteristics of the electrodeless lamp. The circuit structure, load matching, resonant characteristics and parameter design of the electrodeless lamp electronic ballast, as well as the frequency tracking and dimming control strategy are systematically studied. Firstly, the load characteristic of the electrodeless lamp and the circuit structure and working principle of the electronic ballast matched with the electrodeless lamp are introduced. Then the key problem of matching the electrodeless lamp load with the resonant converter circuit of two different structures is pointed out. The output characteristics of resonant converters with different structures are analyzed and deduced in detail, and the matching schemes of circuit structures suitable for different load characteristics of electrodeless lamp are obtained. By analyzing the circuit characteristics of resonant converters for third-order and fourth-order electrodeless lamp, the expression of resonant frequency of resonant converters is deduced, and the expression is tested. Considering the influence of load variation on the resonant frequency, the design idea of optimizing the resonant parameters is put forward according to the special load characteristics of the electrodeless lamp. A design method of resonant parameters of electronic ballast is presented, which takes into account high voltage, maximum power output and ZVS restriction conditions. The experimental results are validated by developing a prototype with different power. A frequency tracking digital control is proposed to solve the problem of inherent resonant frequency drift in the electrodeless lamp system. By analyzing the phase relationship among the parameters of the resonant loop in the resonant state, the closed loop feedback of phase difference is used to track the resonant frequency of the resonant loop. The two dimming strategies both overcome the shortcomings of PFM dimming range and PDM dimming, and realize smooth wide range dimming and stable and reliable operation of electrodeless fluorescent lamp. The application of electronic ballast in high-power electrodeless lamp illumination is introduced. A multi-phase shunt resonant converter which can be used as high-power electrodeless lamp electronic ballast is proposed. The working principle and circuit characteristics of the converter are analyzed. Based on this, a control strategy combining phase-shifting and phase-locking is proposed to realize the dimming of electrodeless lamp. By controlling, the converter can always work near the inherent resonant point of the resonant circuit in the process of in-phase driving and phase-shifting dimming, which avoids the adverse effect of the drift of the inherent resonant point caused by the change of load equivalent parameters on the system and ensures the converter to work stably and reliably. The relationship between phase current, power, circulating current, lamp output power and phase shift angle is deduced. Finally, a 460W electronic ballast prototype is developed. 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】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM923.61

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