电流馈电式半桥荧光灯镇流器的建模及设计

Modeling and parameter optimization of current fed half bridge topology in fluorescent lamp electronic ballast

针对电流馈电式半桥荧光灯电子镇流器的产品设计过程无理论可循、仅仅依靠工程经验试凑参数的问题,探讨了镇流器稳态运行时影响灯管寿命的关键因素,基于等效分析法和相量法建立了拓扑的等效模型并推导了相关公式,提出了电路中关键元件参数的理论计算方法。在不改变电路拓扑的情况下,通过优化设计电路参数,可在保证系统原有性能的基础上进一步减小灯电流的波峰系数(crest factor,CF),通过仿真及实验验证了所建模型及理论计算的准确性,最后通过对比说明经建模后得出的新参数使得灯电流的CF低于原设计,从而有效缓解灯电流对灯管寿命的影响,提高了系统的可靠性。

To solve the issue that there is no theoretical guidance during product design for electric ballasts using current fed half bridge topologies, the key factor to lamp life at stable state was discussed first. To-pology modeling was introduced and relevant formulas were provided based on equivalent analysis and pha-sor method. And then an equivalent circuit model was set up and method for parameter selection of key components was given. Without any change of the topology, the crest fact （ CF） of lamp current was re-duced by parameter optimization of the key components. The accuracy of the model and the method was validated by simulative and experimental waveforms. Finally, a comparison was done to verify that lamp life can be raised effectively through parameter modification of the main circuit based on topology modeling.