Analysis and design of self-oscillating electronic ballast for 36 watts fluorescent lamp by using charge-pump together with valley-fill for power factor correction
Abstract:
This dissertation proposes the analysis and design of self-oscillating electronic ballast for 36 watts fluorescent lamp by using charge-pump together with valley-fill for power factor correction. This ballast is developed to reduce a number of ICs controlling power electronic switches that are costly and sizeable. Instead of these ICs, This ballast employs self-oscillation method to control power electronic switches. The combination of a bridge rectifier, current source charge-pump with valley-fill circuit to improve power factor and Series-Resonant Parallel-Load Inverter (SRPLI) are main concept.
The results of the analysis, design and simulation were created as a prototype for 36 W fluorescent lamp, the circuit operated at a frequency of 37 kHz, a frequency is suitable for ballast circuit. These results were 0.995 power factor input, 4.38% total harmonic distortion of current, 1.4 lamp crest factor of high frequency, according to the TIS 1506-2541 and IEC 61000-3-2 Class C standard, and the overall power efficiency was 94% while applied the rated lamp power.