China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

Segmented light sensing automatically dimmable electronic ballasts, comprising: a rectifier filter circuit, oscillation circuit, the dimming control circuit and the lamp, an oscillation circuit including a first rectifier inductors and the first rectifier diode, the dimming control circuit comprises: a voltage regulatordiode; with the filter capacitor of the Zener diode in parallel, at least a group dimming control sub-circuit, the second rectifier dimming control sub-circuit includes a first rectifier inductive series inductor, the secondary side of the second rectifier inductor in series with a secondorder after the rectifying diode with the dropping resistor and Zener diode in series, the current limiting resistor and the photosensitive resistor in parallel at both ends of the zener diode, the photosensitive resistor ends are respectively connected to the base and the emitter of a composite transistor electrode, the composite transistorthe collector through a freewheeling diode connected to the terminal connected to the current limiting resistor and zener diode, a relay is connected to both ends of the second rectifier inductive. The use of photosensitive resistance sensing ambient light brightness control relay to achieve a multi-stage dimming fluorescent ballasts.