无极灯电子镇流器关键技术研究
发布时间：2018-09-18 06:54
【摘要】：无极灯作为新型气体放电光源,具有寿命长、效率高、无频闪等优点,广泛应用于大范围照明领域尤其是工矿、隧道等不方便换灯的场所。由于无极灯具有负阻特性,需要与镇流器配合才能正常工作。因此,无极灯电子镇流器的分析与设计至关重要。本文以无极灯电子镇流器作为研究对象,结合无极灯的负载特性,对无极灯电子镇流器的电路结构、负载匹配、谐振特性和参数设计以及频率跟踪与调光控制策略等关键问题进行了系统深入的研究。主要包括以下内容：本文首先介绍了无极灯的负载特性以及与之配套的电子镇流器的电路结构和工作原理,由此引出了两种不同结构的谐振变换器电路与无极灯负载进行匹配的关键问题。根据无极灯在不同工作阶段的负载特性,对无极灯从启动到稳定工作期间不同结构谐振变换器输出特性进行了详细分析与数学推导,得到了适合于不同无极灯负载特性的电路结构匹配方案。通过分析三阶和四阶无极灯用谐振变换器的电路特性,推导出了谐振变换器固有谐振频率的表达式,该表达式考虑了负载变化对固有谐振频率的影响。结合无极灯特殊的负载特性,提出了优化谐振参数的设计思路。从不同灯功率、灯启动、负载突变、灯稳态工作时最大功率输出以及逆变器工作状态等多方面考虑,针对三阶和四阶谐振变换器分别提出了一种兼顾点灯高压、最大功率输出以及开关管零电压开通(ZVS)限定条件的电子镇流器谐振参数设计方法,并通过研制不同功率的原理样机进行了实验验证。针对无极灯系统存在的固有谐振频率漂移问题,提出一种频率跟踪数字控制方案。通过分析谐振状态下谐振回路各参量之间的相位关系,采用相位差闭环反馈实现对谐振回路固有谐振频率的跟踪。针对调光控制,提出两种调光策略：脉冲密度调制(PDM)与脉冲频率调制(PFM)相结合以及改进型脉冲密度调制与脉冲频率调制相结合的调光策略。两种调光策略均克服了PFM调光范围不宽的缺陷,又解决了PDM呈有级调光的不足,实现了无电极荧光灯平滑宽范围调光和稳定可靠工作。研制了一台100W的原理样机,实验结果验证了所提方案的有效性。针对电子镇流器在大功率无极灯照明场合的应用,提出了一种可用作大功率无极灯电子镇流器的多相并联谐振变换器,分析了该变换器的工作原理以及电路特性。在此基础上提出一种移相与锁相相结合的控制策略,实现了对无极灯的调光控制,并使变换器能在同相驱动和移相调光过程中始终工作在谐振回路固有谐振点附近,避免了因负载等效参数发生变化导致固有谐振点漂移对系统带来不利影响,确保变换器稳定可靠工作。详细分析了移相角度对开关管软开关的影响情况,推导出了移相过程各相电流、功率、环流以及灯输出功率与移相角度之间的关系。最后研制了一台460W的电子镇流器原理样机,实验结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.
【学位授予单位】：福州大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM923.61
[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.
【学位授予单位】：福州大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM923.61
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