Real-life timer interval adjustment

Details Real-life timer interval adjustment Real-life timer interval adjustment

1993-10-13

1995-05-02

Miska, Vit W.

Horology: time measuring systems or devices

Electrical time base

Solid state oscillating circuit type

368200, 331 25, 364569, G04B 500, G04B 1712, H03L 700, G06F 1520

Patent

active

054126240

ABSTRACT:
A system and method for controlling time-critical functions by dynamically adjusting the interrupt frequency of a microprocessor. Interrupts are generated at a predetermined frequency. Time-critical functions are then performed in response to the interrupts. The interval is adjusted based on timing data from a substantially accurate source. Where the interval is measured in terms of clock pulses, a non-integer number of pulses per interval is attained by varying the number of pulses per interval so that the average over a number of intervals is equal to the non-integer number of pulses per interval. The interval is further adjusted using a selected damping coefficient to eliminate an underdamped condition.

REFERENCES:
patent: 4097801 (1978-06-01), Freeman et al.
patent: 4407589 (1983-10-01), Davidson et al.
patent: 4448543 (1984-05-01), Vail
patent: 4456386 (1984-06-01), Dellea
patent: 4903251 (1990-02-01), Chapman
patent: 4947382 (1990-08-01), Lesea
patent: 5027297 (1991-06-01), Garrity et al.
"Existing Relay Network Interfce (ERNI)", Jun. 1991, ABB Power T&D Company Inc.

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