Switching device for the protective starting of hot-cathode fluorescent lamps supplied from a DC source via a transistor invertor having a high-reactance transformer

摘要

A transistorised ballast for fluorescent lamps has a high-reactance transformer which produces the lamp operating and starting auxiliary voltages. In order that the ballast of the fluorescent lamp guarantees a non-damaging start, the capacitive starting aid has been implemented with the aid of a discharge path, which switches in a delayed manner, via a small separate transformer.