Ballast with arc protection circuit

摘要: A ballast (20) for powering one or more gas discharge lamps (70,72,74,76) comprises an inverter (200), output circuit (300), and arc protection (400). Arc (400) monitors electrical signal within the (300). When arcing condition occurs at connections (302,304,306,308,310), includes a high frequency component having fundamental that is much greater than normal operating of (200). In response to exceeding predetermined threshold, disables (200) shutdown period. also provides restart function periodically attempting ignite operate lamps. preferably realized using microcontroller integrated (440) with associated discrete circuitry, especially wellsuited use in ballasts multiple