400W高压钠灯电子镇流器的研究
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摘要
高压钠灯以其光效高、寿命长、光色好等优点而备受瞩目,然而,与之相匹配的电感镇流器由于功率因数低、体积大等诸多缺点,已不能满足人们对绿色能源的要求。设计与之配套的电子镇流器替代电感镇流器是高压钠灯照明系统的发展趋势。本文提出了一种电子镇流器设计方案,并进行了一定的理论分析和实验研究。
     针对高压钠灯的稳态运行特点以及工作在高频状态下的缺陷,本文设计了一种低频的电子镇流器逆变电路。这种电路利用瞬时电流跟踪控制技术对高频信号进行低频调制,使流过灯的电流为低频电流,不仅起到镇流作用,还避免了高压钠灯的“声共振”现象。
     本文简单分析了大功率高压钠灯启动方式并设计了一种逻辑控制的变压器耦合启动电路。该电路的特点是利用镇流电感作为变压器的副边,简化了主电路结构。并结合逆变主电路的控制,设计了启动器的逻辑控制电路,从而不需要任何隔离措施,启动时数千伏的启动电压也不会对电路中其它元器件造成损坏。
     本文简单介绍了无源和有源功率因数校正的工作原理,并利用功率因数校正芯片UC3854A/B制作了电子镇流器的功率因数校正电路。
High Pressure Sodium Lamps (HPS) are notable for their high luminous efficacy, good color rendering and long life. But the traditional ferromagnetic ballast for HPS lamps due to lower power factor, high igniting current, lower efficiency, and large size, cannot satisfy the requirements for green energy. So it is time to design the electronic ballast to replace the core-coil ballast. A new method of planning electronic ballast is put forward to La this paper. Theoretical analysis and experimental results are given for the proposed electronic ballast.
    The operation characteristics and the limitations under high condition of HPS lamps are described. According to these , a new low frequency invert circuit is designed based on current-track in this paper.
    Analyzing the igniting method of LC resonance and considering the control of the inverted main circuit, this paper designs an igniting circuit with transformer coupling controlled by logic. The advantage of the above circuit is that it does not need any separation, moreover the other parts hi the circuit does not damaged by the thousands of volts during the igniting.
    What more, this paper presents the theory of the power factor correction, and design the appropriated circuit with the chip of PFC-UC3854A/B.
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