Electronic delay circuit for firing ignition element

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

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Details

F42B 3/16 (2006.01) F42B 3/12 (2006.01) F42D 1/055 (2006.01) H03L 3/00 (2006.01)

Patent

CA 2091718

An electronic delay circuit for firing an ignition element. The delay circuit includes a capacitor which stores electric energy supplied from an electric blasting machine, an oscillator generating a clock pulse train, a circuit for over-exciting the oscillator, a counter which counts clock pulses of the clock pulse train, and a circuit for maintaining a reset state of the counter for a predetermined time period after the electric energy is supplied. The counter produces a trigger signal when it counts a predetermined number of the clock pulses, and the electric energy stored in the capacitor is discharged to the ignition element. Since the oscillator enters into the steady state in a very short time by the over-excitation, the delay circuit has large resistance to external noise.

L'invention est un circuit de retardement électronique utilisé pour amorcer un élément d'allumage. Le circuit de retardement comporte un compensateur qui stocke l'énergie électrique fournie par un dispositif d'amorçage électrique, un oscillateur qui produit un train d'impulsions d'horloge, un circuit de surexcitation de l'oscillateur, un compteur qui compte les impulsions d'horloge contenues dans le train d'impulsions d'horloge, et un circuit servant à maintenir le compteur initialisé durant une période de temps prédéterminé après l'alimentation en énergie électrique. Le compteur produit un signal de déclenchement quand il a compté un nombre prédéterminé d'impulsions d'horloge et l'énergie électrique stockée dans le condensateur à décharger dans l'élément d'allumage. Étant donné que l'oscillateur passe très rapidement à un régime permanent sous l'effet de la surexcitation, le circuit de retardement est très bien protégé contre le bruit externe.

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