SOLID STATE ELECTRONIC BALLAST

摘要

The electronic ballast for a fluorescent lamp replaces the three main components of a traditional fluorescent lamp ballast, namely the ferro-magnetic ballast, the power factor condenser, the starter and starter holder. The solid state electronic ballast of the invention comprises a power supply conversion circuit, a start-up circuit and a switching resonant circuit. The power supply conversion circuit consists of a common mode line filter connected with a rectifier bridge circuit and a low harmonic filter. Connected in series follows the start-up circuit with a sawtooth oscillator, a diac trigger and a first transistor. A second transistor forms together with an inductor, a transformer, and a lamp-load the resonant-circuit. The electronic ballast of the invention saves costs, energy and weight.