ELECTRONIC BALLAST FOR FLUORESCENT LAMPS

摘要

26362-12 Electronic ballast for fluorescent lamps having a rectifying circuit for the A.C. network voltage and a chopper circuit which chops the rectified voltage with a frequency considerably higher in comparison with the network voltage into a series of pulses which are then applied to one set of the ends of the two lamp electrodes via a current-restric-ting device, the other set of ends of which are connected to an ignition circuit, whereby a current-increasing circuit is inserted between the current-restricting circuit and the lamp electrodes which may comprise an LC-resonance circuit.