一种基于数字控制的连续冲击软启动控制策略

An Iterative Ignition Soft Start-up Control Strategy based on Digital Processor

串并联负载谐振(SeriesParallelLoadedResonant,简称SPLR)——LCC电路,以其拓扑结构简单,无需外加启动电路等优点,广泛用于电子镇流器,但其缺点是在并联负载谐振(ParallelLoadedResonant,简称PLR)产生高压的同时,谐振电流过大,在小功率应用中容易造成电感饱和,使得回路电流激增,进而损坏开关器件。本文提出了一种基于数字控制的连续冲击软启动控制策略,在不添加额外器件的基础上有效限制了谐振电压的幅值,避免了电感饱和,减小了灯极溅射,并可以保证可靠启动。

Series-Parallel-Loaded Resonant （SPLR） inverter is widely applied to electronic ballast thanks to the topology advantage.SPLR topology is simple in structure and dispense with the external ignitor.The main defect is that the resonant current is too large while the high igniting voltage is achieved.Excessive resonant current can cause the inductor to saturate especially in low wattage application and destroy switch device.An iterative ignition soft start-up control strategy based on digital processor is proposed in this paper.Tile method can restrict the resonant voltage low enough to prevent inductor saturation and reduce the sputter of the lamp electrode.The proposed control strategy can ensure lamp start-up without additional device.