LAMP START-UP SEQUENCE WITH INTERRUPTION PERIOD

摘要

A ballast for feeding a high-pressure discharge lamp, comprising: - means for supplying the lamp with an AC voltage at an ignition frequency (fi) during an ignition period (ti), - means for supplying the lamp with an AC voltage at a glow frequency (fg) during a glow period (tg) following the ignition period (ti), - means for repeating the start-up sequence of ignition period and glow period (ti, tg), means for supplying the lamp with an AC voltage at an operating frequency (fb) during an operating period (tb) following the last start-up sequence, and - means for interrupting the power supply to the lamp in a start-up sequence, not being the last start-up sequence, during an interruption period (td) following the glow period (tg).