ELECTRONIC BALLAST SYSTEM, INVERTER BALLAST CIRCUIT USED FOR IT, AND POWER FACTOR CORRECTION CIRCUIT

摘要

PPROBLEM TO BE SOLVED: To generate a power factor close to one for improving efficiency of an electronic ballast system. PSOLUTION: This electronic ballast system actuates one or more fluorescent lamps, provides a general-purpose input of 108-305 V and emergency lighting, and has a subsystem including a battery, a battery charger, and a related logic circuit for actuating one or more fluorescent lamps. This electronic ballast system includes a circuit, by which electric power can be fed to the fluorescent lamp without preheating its negative electrode, and a power factor correction circuit using a mean current mode given by a pulse width modulator for obtaining the power factor close to 1 for an electronic power circuit. PCOPYRIGHT: (C)2003,JPO