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公开(公告)号：EP0637401B1
公开(公告)日：1996-11-20
申请号：EP94907986.7
申请日：1994-02-07
摘要： In a fluorescent lighting controller, a switching circuit operates to selectively couple a bank of electronic ballasts (36) to an AC power source (34). The switching circuit comprises a pair of relays (RL3, RL4), preferably connected in parallel, with one of such relays having a controllably conductive device (Q1), such as an electronic switch, and preferably a triac, connected in series therewith. With the relays open, an air gap isolates the power source and ballasts. In closing the relays in sequence, one relay (RL3) provides a conductive path from the power source to the triac. After a suitable delay to allow the relay contacts to stabilize in the closed position, the triac is triggered to provide a conductive path from the power source to the ballasts, and a large current surge (as much as 300 amps) flows to the ballasts. After the current surge has subsided, the other relay (RL4) is closed to provide a direct conductive path between the power source and ballasts. As a result of this arrangement, the switching circuit is low cost, compact and reliable over an extended period of time.
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2.发明公开TWO RELAY SWITCHING CIRCUIT FOR FLUORESCENT LIGHTING CONTROLLER 失效与两个继电器SHALTGERÄT开关，用于VORSCHALGERÄT的放电灯。
公开(公告)号：EP0637401A1
公开(公告)日：1995-02-08
申请号：EP94907986.0
申请日：1994-02-07
摘要： In a fluorescent lighting controller, a switching circuit operates to selectively couple a bank of electronic ballasts (36) to an AC power source (34). The switching circuit comprises a pair of relays (RL3, RL4), preferably connected in parallel, with one of such relays having a controllably conductive device (Q1), such as an electronic switch, and preferably a triac, connected in series therewith. With the relays open, an air gap isolates the power source and ballasts. In closing the relays in sequence, one relay (RL3) provides a conductive path from the power source to the triac. After a suitable delay to allow the relay contacts to stabilize in the closed position, the triac is triggered to provide a conductive path from the power source to the ballasts, and a large current surge (as much as 300 amps) flows to the ballasts. After the current surge has subsided, the other relay (RL4) is closed to provide a direct conductive path between the power source and ballasts. As a result of this arrangement, the switching circuit is low cost, compact and reliable over an extended period of time.
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