Ballast

In the late 1980s, the United States applied toroidal inductive ballasts to compact energy-saving fluorescent lamps. In 1988, Midwest Toriod began mass production. my country started production in the early 1990s.

A ballast resistor is a device that limits current and generates instantaneous high voltage in fluorescent lamps. It is made by winding enameled wire on an iron core made of silicon steel. Such a coil with an iron core turns on/off in an instant. When the time, it will self-induct high voltage, which is applied to the electrodes (filaments) at both ends of the fluorescent tube. This action is carried out alternately. When the starter (jumping bulb) is closed, the filament of the lamp tube passes through the current limit of the ballast and conducts heat; when the starter is open, the ballast will self-induct and generate high voltage. On the filaments at both ends of the tube, the filament emits electrons to bombard the fluorescent powder on the tube wall to emit light. The starter is repeatedly turned on and off several times, and this action will be repeated several times to open the tube. When the lamp tube emits light normally, the internal resistance becomes smaller, and the starter always keeps an open circuit state, so that the current will steadily pass through the lamp tube and the ballast to work, so that the lamp tube emits light normally. Since the ballast always has current when the fluorescent lamp is working, it is prone to vibration and heat generation. Therefore, the fluorescent lamp with ballast, especially when the quality of the ballast is not good, will produce a lot of sound. After a long time, it is easy to burn. Ballasts are divided into electronic ballasts and inductive ballasts.