Apparatus for generating pulses upon decreases in supply voltage

Details Apparatus for generating pulses upon decreases in supply voltage Apparatus for generating pulses upon decreases in supply voltage

1981-07-30

1984-01-31

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307234, 307608, 340663, H03K 5153, G01R 19165

Patent

active

044292368

ABSTRACT:
A pulse for resetting computing equipment is generated upon a drop in the supply voltage. In a first embodiment of a circuit furnishing such a reset pulse, a comparator is used whose inverting input is connected to the supply line through a capacitor and to ground potential through a parallel diode-resistor combination. The direct input is connected to the tap of a voltage divider and is connected through a feedback resistor to the output. This circuit can detect drops in supply voltage in the order of the forward drop across the diode. Alternatively, a RC oscillator can be used to generate a reset pulse. If the capacitor in the circuit is not recharged in time by a pulse furnished by the computing equipment being controlled, it is assumed that failure to receive the pulse is indicative of a drop in supply voltage.

REFERENCES:
patent: 4245150 (1981-01-01), Driscoll et al.
patent: 4296338 (1981-10-01), Thomas
patent: 4367423 (1983-01-01), Hornung

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