An electronic ballast is a converter that uses electronic technology to convert a power frequency AC power source into a high-frequency AC power source, used to drive an electric light source to complete lighting functions. It converts a power frequency AC power supply into a DC power supply by passing it through a radio frequency interference (RFI) filter, full wave rectification, and a passive (or active) power factor corrector (PPFC or APFC), and then outputs a high-frequency AC power supply of 20K-100KHZ through a DC/AC converter, which is added to an LC series resonant circuit connected to the lamp to heat the filament and generate a resonant high voltage on the capacitor, causing the lamp to discharge and become conductive, entering a luminous state. High frequency inductance plays a role in limiting the increase of current, ensuring that the lamp tube obtains the required lamp voltage and current for normal operation. In order to improve reliability, various protection circuits are often added, such as abnormal protection, surge voltage and current protection, temperature protection, etc.