SELECTIVELY ACTUABLE ELECTRICAL CIRCUIT FOR ELECTRICALLY IGNITABLE LOAD

摘要

27 SELECTIVELY ACTUABLE CONTROL CIRCUIT FOR AN ELECTRICAL LOAD A control circuit for firing an electrically actuable igniter in response to a firing signal having predetermined characteristics. For protection from inadvertent or accidental actuation, the control circuit includes at least one inductor in series with the fuse wire of the igniter and at least one inductor in parallel with the source of the firing signal. The series and parallel inductors are electromagnetically coupled to one another through a ferrite bead and are electrically connected so as to generate opposed magnetic effects when current flows through them. Electric detonators incorporating the control circuit are also detailed.