Tunable timing circuit and method for operating same and blastin

Details Tunable timing circuit and method for operating same and blastin Tunable timing circuit and method for operating same and blastin

1993-03-31

1994-11-29

Pihulic, Daniel T.

Ammunition and explosives

Igniting devices and systems

Ignition or detonation circuit

361249, F23Q 702

Patent

active

053679571

ABSTRACT:
An externally tunable clock circuit (10) and a method for adjusting the calibration of a clock circuit with an externally defined time period. A voltage controlled oscillator (VCO) (40) provides clock signals of variable frequency, and a counter (42) receives timing and control signals to provide a digital count indicative of clock signals during a predetermined period. The input voltage to the VCO (40) is adjusted based on differences between the oscillator clock count and a predetermined value. Calibration of the clock circuit (10) is done by counting clock signals from the VCO (40) during an externally defined time period, then comparing the clock signal count with a predetermined value that represents a desired frequency. The VCO frequency is then adjusted according to the difference between the clock signal count and the predetermined value. A system (20) can embody a number of such tunable clock circuits (10) and may include a controller (30) connected to provide timing and control signals to define a predetermined time period for performing oscillator adjustments. The system enables accurate timing and individual control of sequential operations. This is particularly advantageous for operations at different locations, for example, to provide a plurality of detonators in blasting or explosive detonation operations.

REFERENCES:
patent: 4419933 (1983-12-01), Kirby et al.
patent: 5229700 (1993-07-01), Stitt et al.

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