| 摘要 |
PURPOSE:To relax a heat radiating means regardless of rush currents in case that overcurrent conditions continue even after the time of a timer, which is connected to a protective circuit of vertical down properties, is up, by lowering the protective current set value. CONSTITUTION:A vertical down property protective circuit 1 lets currents flow from a protective circuit input end 2 to a protective circuit output end 6 through a current control part 3 and a current detection part 4. The current detection part 4 starts a timer circuit part 7 when it detects the currents above the specified value. Even if the timer circuit 7 measures a specified time, it lowers the set value of a protective currents setting part 5 so as to make it control 3 load currents when the current control part 3 does not take breaking actions. Hereby, a protective circuit is formed wherein a heat radiating means is relaxed regardless of rush currents. |
