一种基于T型滤波器的调光型超高频电子镇流器

Dimmable UHF Electronic Ballast Based on T Type Filter

电子镇流器工作在超高频率情况下,可以有效的克服HID灯所固有的声谐振问题。基于T型滤波器的调频调光方法,能够在很窄的工作频率范围内实现深度调光,而且具有灯电流波峰因数低,灯电流波形正弦度好的优点。本文提出了一种基于T型滤波器的调光型超高频电子镇流器。理论分析与实验结果论证了该电路的有效性。

An electronic ballast with ultrahigh frequency （UHF） can avoid the intrinsic acoustic resonance problem of HID lamps. The ballast consists of a PFC converter circuit and an inverter circuit. The inverter circuit includes a half bridge inverter and a T type filter running at very high frequency. Based on the T type filter, wide dimming ability can be achieved within a narrow frequency range. At the same time the lamp current keeps a perfect sine wave, which means that low current crest factor of the lamp is achieved. Frequency modulation with power control is implemented to dim the lamp. Its validity is proved by both theoretical analysis and experimental results.