Monitoring circuit for resetting malfunctioning electronic compo

Details Monitoring circuit for resetting malfunctioning electronic compo Monitoring circuit for resetting malfunctioning electronic compo

1982-09-30

1985-04-16

Atkinson, Charles E.

Excavating

36443111, 371 62, G06F 1100, F02D 3500

Patent

active

045120196

ABSTRACT:
A capacitor which is charged by recurring square waves of a normally functioning microprocessor discharges at a steady rate, so that if the square waves do not continue, an operational amplifier will switch over and produce a reset pulse for the microprocessor. Repeated transitions of one polarity of the square wave recharge the capacitor during a short interval terminated by a second operational amplifier when the capacitor reaches a fixed level of charge. This second amplifier, which has feedback coupling, also initiates the timing discharge of the capacitor. A diode network at its output prevents charging the capacitor in the static state. This arrangement makes it unnecessary to provide another capacitor for quickly recharging the capacitor to prevent its discharge from switching over the first-mentioned operational amplifier.

REFERENCES:
patent: 4244050 (1981-01-01), Weber et al.
patent: 4304003 (1981-12-01), Kakizawa et al.
patent: 4317167 (1982-02-01), Hartig et al.
patent: 4355359 (1982-10-01), Kanegae et al.
patent: 4405982 (1983-09-01), Ruhnau et al.
patent: 4408328 (1983-10-01), Wakai
patent: 4410938 (1983-10-01), Higashiyama
Initializing Circuit for Digital Computers, Research Disclosure, (G.B.), No. 184, (Aug. 1979), p. 411.

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