Voltage level judging device

Details Voltage level judging device Voltage level judging device

1989-07-12

1990-03-06

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

324433, 324426, 320 48, 340636, 307350, 307362, G01N 2746, G05F 146

Patent

active

049060554

ABSTRACT:
A device for determining whether a source voltage from a power source to be applied to a load such as an electrical apparatus is below a standard level but above a specified level or below this specified level includes a voltage divider circuit for dividing the source voltage, a single voltage level detection circuit for comparing an inputted voltage, a transistor switch with which the source voltage or the output voltage from the voltage divider circuit is selectably inputted to the voltage level detection circuit, and a central processing unit for controlling the operation of the transistor switch according to the result of detection by the voltage level detection circuit.

REFERENCES:
patent: 4020414 (1977-04-01), Paredes
patent: 4080560 (1978-03-01), Abert
patent: 4316185 (1982-02-01), Watrous et al.
patent: 4410766 (1983-10-01), Beirne
patent: 4445090 (1984-04-01), McCocik et al.
patent: 4521735 (1985-06-01), Kageyama et al.
patent: 4684877 (1987-08-01), Shreve et al.
patent: 4698578 (1987-10-01), Mullersman et al.
patent: 4709200 (1987-11-01), Ochiai
patent: 4774450 (1988-09-01), Kitamura

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