In the late 1980s, the United States applied circular inductance ballasts to compact energy-saving fluorescent lamps. In 1988, Midwest Toriod began mass production. China began production in the early 1990s. A ballast is a device used in fluorescent lamps to limit current and generate instantaneous high voltage. It is made by wrapping enameled wire around an iron core made of silicon steel. This coil with an iron core, when turned on/off in an instant, will self induce high voltage and apply it to the electrodes (filaments) at both ends of the fluorescent lamp tube. This action is carried out alternately. When the starter (jump bubble) is closed, the filament of the lamp tube heats up by limiting the current through the ballast; When the starter opens, the ballast will self induce high voltage to be applied to the filaments at both ends of the lamp tube. The filaments emit electrons to bombard the fluorescent powder on the tube wall, emitting light. The starter will be turned on and off several times, and this action will be repeated several times to open the lamp tube. When the lamp tube emits light normally, the internal resistance decreases, and the starter remains in an open circuit state. This way, the current flows stably through the lamp tube and ballast, causing the lamp tube to emit light normally. Due to the constant current passing through the ballast during the operation of the fluorescent lamp, it is prone to vibration and heat generation. Therefore, fluorescent lamps with a ballast, especially when the quality of the ballast is poor, will produce a loud noise, which can be easily burned out over time. Ballasts are divided into electronic ballasts and inductive ballasts. In the 1970s, there was a global energy crisis, and the urgency of energy conservation led many companies to focus on the research of energy-saving light sources and fluorescent lamp electronic ballasts. With the rapid development of semiconductor technology, various high back voltage power switching devices continued to emerge, providing conditions for the development of electronic ballasts. In the late 1970s, foreign manufacturers took the lead in launching the first generation of electronic ballasts, which was a major innovation in the history of lighting development. Due to its many advantages such as energy conservation, it has attracted great attention and interest worldwide, and is considered an ideal product to replace inductance ballasts. Subsequently, some famous enterprises have invested considerable manpower and material resources to carry out higher-level research and development. Due to the rapid advancement of microelectronics technology, electronic ballasts have developed towards high-performance and high reliability. Many semiconductor companies have launched a series of specialized power switch devices and control integrated circuits. In 1984, Siemens developed active power factor correction electrical ICs such as TPA4812, with a power factor of 0.99. Subsequently, some companies successively launched integrated electronic ballasts, and in 1989, Finnish company Helwali successfully launched dimmable single-chip integrated circuit electronic ballasts. Electronic ballasts have been promoted and applied worldwide, especially in developed countries