Voltage detecting circuit

Details Voltage detecting circuit Voltage detecting circuit

1988-07-29

1990-05-01

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, 307360, 307361, H03K 5153

Patent

active

049221337

ABSTRACT:
A voltage detecting circuit comprising a voltage-input terminal for receiving a first voltage or a second voltage higher than the first voltage, switch means connected between the voltage-input terminal and a first node, and an inverter circuit having an input terminal coupled to the first node and an output terminal coupled to a second node. The switch circuit is turned on when the voltage at the voltage-input terminal is higher than a predetermined value which is between the higher than the first voltage and lower than the second voltage, and is turned off when the voltage at the voltage-input terminal is lower than the predetermined value. The inverter circuit includes a first transistor having a source-drain path coupled between a first power-source potential terminal and the second node, a current control section for maintaining a current flowing through the source-drain path of the first transistor at a predetermined value, and a second transistor having a source-drain path connected between the second node and a second power-source potential terminal and a gate coupled to the first node.

REFERENCES:
patent: 4709165 (1987-11-01), Higuchi et al.
patent: 4806788 (1989-02-01), Tobita
patent: 4812680 (1989-03-01), Kawashima et al.
patent: 4825018 (1989-04-01), Okada et al.
Japanese Patent Disclosure (Kokai) No. 62-98823; T. Shibata et al., Dated May 8, 1987.

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