Voltage detection circuit for detecting input voltage larger in

Details Voltage detection circuit for detecting input voltage larger in Voltage detection circuit for detecting input voltage larger in

1984-12-07

1987-04-14

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307356, 307296R, 365230, 324158R, H03K 5153, G11C 800, G01R 3128

Patent

active

046581561

ABSTRACT:
A voltage detection circuit for detecting an input voltage larger in absolute value than a power supply voltage is disclosed. This circuit comprises a first transistor connected between a terminal supplied with the input voltage and a circuit node, and a second and a third complementary transistors connected in series between the circuit node and a reference potential terminal. The first transistor is used as a voltage-dropping means, and the gates of the second and third transistors are commonly supplied with the power supply voltage. When the potential difference between the circuit node and the gate of the second transistor exceeds the threshold value of the same transistor, the second transistor is turned ON and the potential at the connection point of the second and third transistors begins to change. At this time, the input voltage is higher in absolute value than the power supply voltage because the first transistor operates as the voltage-dropping means.

REFERENCES:
patent: 4318013 (1982-03-01), Thomas et al.
patent: 4321489 (1982-03-01), Higuchi et al.
patent: 4348596 (1982-09-01), Atherton et al.
patent: 4521696 (1985-06-01), Raghunathan

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