Ballast

In the late 1980s, the United States applied a toroidal magnetic ballast to compact fluorescent lamps, and in 1988 Midwest Toriod began mass production. China began production in the early 90s.

The ballast resistor is a device for limiting the flow of fluorescent lamps and generating high-voltage transients. It is made by winding an enameled wire around a core made of silicon steel. Such a coil with iron core turns on/off instantaneously. At this time, a high voltage is generated by self-induction and applied to the electrodes (filaments) at both ends of the fluorescent tube. This action is alternated. When the starter (bubble) is closed, the filament of the lamp passes through the ballast to limit the flow of heat; when the starter is opened, the ballast will self-induct high voltage. At both ends of the tube, the filament emits electrons that bombard the fluorescent powder on the tube wall. The starter is repeatedly turned on and off several times, and several such actions are repeated to open the lamp. When the lamp is normally illuminated, the internal resistance becomes smaller, and the starter always maintains an open circuit state, so that the current can be stably operated through the lamp tube and the ballast, so that the lamp can emit light normally. Since the ballast is always operated with fluorescent lamps when it is working in a fluorescent lamp, it is prone to vibrations and will generate heat. Therefore, there are fluorescent lamps for ballasts. Especially when the ballast is of poor quality, it will generate a lot of sound. A long time, it is easy to burn. Ballasts are divided into electronic ballasts and magnetic ballasts.