一种新型调光电子镇流器

Novel Control Method for Dimming Electronic Ballast

介绍了一种新型的荧光灯调光控制方式,即通过同时调制占空比和开关频率的方式控制荧光灯的输出功率。首先,基于与功率相关的荧光灯模型,通过基波近似的方法得到了控制方程,得出了荧光灯的调光特性。然后,以一个半桥式串联谐振并联负载电路为例,给出了设计步骤及仿真、实验结果。

A novel control technique has been developed for high frequency dimming ballast of fluorescent lamps. By modulating the duty-cycle and frequency simultaneously the lamp power can be regulated smoothly and a wide dimming range has been achieved. Based on the power-dependent lamp model, the control equations are derived by fundamental approximation, and then the dimming characteristics of the fluorescent lamp are calculated. An electronic ballast with the half bridge series-resonant parallel-load inverter for the fluorescent lamp was used as an example for illustrating the design procedure. A laboratory circuit is built and tested. The experimental results are presented to verify the theoretical discussions.