Hybrid electronic detonator delay circuit assembly

F - Mech Eng,Light,Heat,Weapons – 42 – B

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F42B 3/10 (2006.01) F42B 3/12 (2006.01) F42C 11/06 (2006.01)

Patent

CA 2272712

An electronic delay circuit (10) for use in a detonator (100) has a switching circuit (20) and a timer circuit (22). Switching circuit (20) controls the flow of a stored charge of electrical energy from a storage capacitor (12) to a bridge initiation element such as a semiconductor bridge (18) or a tungsten bridge. The timing of the release of this energy is controlled by timer circuit (22). Switching circuit (20) is an integrated, dielectrically isolated, bipolar CMOS (DI BiCMOS) circuit, whereas timer circuit (22) is a conventional CMOS circuit. The use of a DI BiCMOS switching circuit allows for greater efficiency of energy transfer from the storage capacitor (12) fo the semiconductor bridge (18) than has previously been attained.

Cette invention se rapporte à un circuit à retard électronique (10) conçu pour un détonateur (100) et pourvu d'un circuit de commutation (20) et d'un circuit de temporisation (22). Le circuit de commutation (20) commande le flux d'une charge stockée d'énergie électrique, d'un condensateur de stockage (12) vers un élément d'amorçage du type pont tel qu'un pont semi-conducteur (18) ou un pont au tungstène. La temporisation de la libération de cette énergie est commandée par le circuit de temporisation (22). Le circuit de commutation est un circuit CMOS (DI BiCMOS) bipolaire, électriquement isolé et intégré, tandis que le circuit de temporisation (22) est un circuit CMOS classique. L'utilisation du circuit de commutation DI BiCMOS permet d'obtenir une meilleure efficacité de transfert d'énergie entre le condensateur de stockage (12) et le pont semi-conducteur (18) que cela n'est le cas avec les dispositifs conformes à l'état antérieur de la technique.

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