With this scheme a low cost distributive control system for lighting applications has been achieved, allowing energy and maintenance saving and reliability increase of the fluorescent lighting systems. The characteristics and design considerations of this ballast are discussed in this paper. Dimming control is achieved by varying the switching frequency. The frequency modulation scheme is used to reduce the low-frequency output current ripple. A prototype of 36WT8 fluorescent lamp ballast has been implemented and tested.
Experimental results verify the analytical derivations.
The parasitic resonance caused by the parasitic inductance and the stray capacitance is prevented greatly. A 34-inch AC PDP equipped with the proposed driving circuit, operated at 100 kHz, is investigated. In addition, some prior arts are shown in this paper for comparison, and their power consumption of driving the same 34-inch panel is measured. The experimental results show that the proposed driver has a low cost structure and better performance than the prior ones. The results on several switching converters suggest the analytical Newton's method to be the most accurate and fastest.