Patent ID: 7975612
Filing Date: 2011-07-12
Classification: F42D,H04L

Abstract:
1. A pyrotechnic device comprising: a) a pyrotechnic electronic detonator for use in an electronic blasting system, said detonator comprising an igniter; b) a firing energy storage module connected to said igniter; c) a constant current charging module within said pyrotechnic device and connected to said firing energy storage module, said constant current charging module being configured and/or programmed to charge said firing energy storage module with a single pulse of uninterrupted substantially constant current until a predetermined rail voltage corresponding to the desired firing energy of said firing energy storage module is reached, such that the voltage of said firing energy storage module increases substantially linearly with respect to time during said charging; and d) means for storing, for subsequent use in a countdown/fire sequence, a firing delay time that can be selected by a user from a plurality of values wherein zero is not an acceptable value.