Patent ID: 6141202
Filing Date: 2000-10-31
Classification: H01H

Abstract:
A method for blowing, in an electrical conductor, a melting fuse having a fuse blow out threshold, comprising the following steps:(a) sensing an electrical parameter with a sensor (3) to provide a measured value (m) representing a current passing through said melting fuse,(b) first generating a constant first threshold value (I.sub.1) below said fuse blow out threshold,(c) first comparing said measured value (m) with said constant first threshold value (I.sub.1) for providing a first difference value,(d) generating, in response to said first difference value, a dynamic time variable second threshold value (I.sub.2) higher than said first threshold value (I.sub.1) and corresponding at the most to said fuse blow out threshold,(e) decaying said second higher threshold value (I.sub.2) within a fixed decay time period (t.sub.2 -t.sub.1) and in accordance with a decay function down to said first threshold value (I.sub.1),(f) second comparing said decaying second higher threshold value (I.sub.2) with said measured value (m) for ascertaining whether during said fixed decay time period said measured value (m) exceeds said second threshold value (I.sub.2) to provide a second difference value,(g) generating a fuse destruct signal (FDS) in response to said second difference value, and(h) blowing said melting fuse in response to said fuse destruct signal (FDS).