This document is AN3400 application note, which introduces the role of BJT complementary pair in self-oscillating resonant driving system in CFL lighting application
The document presents an analysis and simulation of a novel zero-voltages switching (ZVS) clamped-voltage (CV) self-oscillating resonant driving system designed for compact fluorescent lamps (CFL). The system utilizes a complementary pair of bipolar transistors in a half bridge converter section to drive the lamp. An LC network filters the voltage generated by the secondary winding of the load transformer, producing a periodic switching signal that accurately controls the bases of the transistors without requiring a saturable core auxiliary transformer.
The oscillation frequency is typically around 35 to 48 kHz and can be increased by shortening the storage time of the bipolars.
The analytical results were validated by mathematical simulation using the Matlab tool.