| 摘要 |
PROBLEM TO BE SOLVED: To provide a lamplight blownout filament-detecting device capable of reliably detecting blownout filament of lamplight without using disposables such as an arrestor. SOLUTION: The lamplight blownout filament-detecting device includes a master station 18 which sends a signal via a power supply wire 15 from the constant-current power supply 14 to a plurality of lamplights 12 in which a power supply circuit is constituted by respective detection on a secondary side of a plurality of transformers 16 where a primary side is connected in series to a constant-current power supply 14, and a slave station 23 which is respectively installed on the secondary side of the respective transformers 16 and carries out sending and receiving of the signal between the master station 18. At the slave station 23, a switch 24 which, on the secondary side of the transformers 16, always in an Off state, bypasses a power supply current supplied to the lamplight 12 by carrying out On operation, and a calculation treatment part 30 to monitor the power supply current to the lamplight 12 and to decide that there is blownout filament by determining a phenomenon of a current-stopped state by the lamplight 12 blownout filament, and to turn on the switch 24 are installed. COPYRIGHT: (C)2011,JPO&INPIT |
