Delay circuit for use in electric blasting system

Details Delay circuit for use in electric blasting system Delay circuit for use in electric blasting system

1989-02-13

1991-01-15

Jordan, Charles T.

Ammunition and explosives

Igniting devices and systems

Ignition or detonation circuit

102220, F23Q 2100

Patent

active

049845195

ABSTRACT:
A delay circuit for use in an electric blasting system including a capacitor for storing electric energy supplied from an electric blaster, an actuation circuit for detecting the stop of voltage supply from the blaster to generate an actuation signal, a circuit for generating clock pulses, a circuit for counting a predetermined number of clock pulses in response to the actuation signal to generate an igniting signal, and a switching circuit for responding to the igniting signal to discharge the electric energy stored in the capacitor through an igniting resistor, the actuation circuit having a zener diode with a threshold voltage. When the voltage supply from the blaster is stopped and the voltage across the zener diode becomes lower than the threshold voltage, the zener diode is cut-off to generate the actuation signal.

REFERENCES:
patent: 3862602 (1975-01-01), Manning
patent: 4445435 (1984-05-01), Oswald
patent: 4572288 (1986-02-01), Kinley
patent: 4586437 (1986-05-01), Miki et al.
patent: 4825765 (1989-05-01), Ochi et al.

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