Circuit for sensing voltages beyond the supply voltage of the se

Details Circuit for sensing voltages beyond the supply voltage of the se Circuit for sensing voltages beyond the supply voltage of the se

1988-06-17

1989-12-26

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, H03K 524

Patent

active

048900133

ABSTRACT:
A voltage sensing circuit wherein voltages that appear at first and second sensing nodes are converted into first and second currents which are proportional to their respective voltages. A comparing circuit compares the first current to the second current and generates a difference current proportional to the difference between the magnitudes of the two currents. A rectifier circuit rectifies the difference current, and the difference current is added to a reference current. The combined current is applied to the first input terminal of a comparator. The second input terminal of the comparator is coupled to a reference voltage, and the comparator indicates when the voltage created from the combined currents exceeds the reference voltage.

REFERENCES:
patent: 4593380 (1986-06-01), Kocher et al.
patent: 4749880 (1988-06-01), Kobatake
patent: 4751405 (1988-06-01), Bufano, Jr. et al.
patent: 4754169 (1988-06-01), Morris

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