Thanks to its simplicity and low cost, the most commonly used electronic driving circuit for compact fluorescent lamps is a self oscillating voltage fed topology. After the start-up, the DC-AC converter is maintained in oscillation by the feedback to the base of the bipolar transistors via the transformer . The new complementary pair solution, based on relatively high gain power bipolar transistors, allows lamp ballast designers to eliminate the saturable core auxiliary transformer as well as the start up network. It is based on a half bridge voltage fed topology and works using an auxiliary winding on the inductor in series with the lamp, in order to generate the waveform of the resonant driving circuit. Standard self oscillating as well as complementary pair solution have a high tolerance on the switching frequency and are not able to control lamp power. The only way to design a compact and smart driving circuit is to use dedicated ICs with high voltage capability and built-in oscillator. Preheating and dimming function area also available according to application needs.




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