Voltage detection circuit

Details Voltage detection circuit Voltage detection circuit

1979-07-31

1982-03-23

Anagnos, Larry N.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307450, 307360, 365226, H03K 17687, H03K 5153, H03K 524

Patent

active

043214894

ABSTRACT:
A voltage detection circuit, for detecting two voltages, that is, a high voltage level and a low voltage level, is disclosed. The voltage detection circuit according to the present invention includes a load element group having a first terminal and a second terminal, and a transistor which is connected between the second terminal of the load element group and ground. The sum of threshold voltages of the load element group has a value higher than the low voltage level to be detected and lower than the high voltage level to be detected. The load element group is kept in an off state when the low voltage level is applied thereto and is kept in on state when the high voltage level is applied thereto. The voltage to be detected is applied to the first terminal of the load element group and, when the voltage to be detected has a high voltage level, a low voltage is supplied to a control terminal of the transistor, and; when the voltage to be detected has a low voltage level, a high voltage is supplied to the control terminal of the transistor, so that the voltage to be detected is estimated by a voltage at a connection point between the second terminal of the one space load element group and the transistor.

REFERENCES:
patent: 3789246 (1974-01-01), Preisig
patent: 4013902 (1977-03-01), Payne
patent: 4048524 (1977-09-01), Laugesen et al.
patent: 4140930 (1979-02-01), Tanaka
patent: 4224539 (1980-09-01), Musa et al.

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