Switch circuit

Electrical transmission or interconnection systems – Switching systems – Plural switches

Patent

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Details

355 3SH, 355 14SH, H01H 1964, H01H 4700

Patent

active

044712340

ABSTRACT:
A circuit for indicating the current or existing composite operating states of a plurality of switches switchable between open and closed states, and all normally disposed in a first of those states, includes a resistance of predetermined value for and connected to each switch, and connections between all of the switch-resistance combinations to form a switch assembly which outputs a total resistance uniquely defined in accordance with the particular existing open and closed states of the plural switches. A constant current source supplies a constant current to the switch assembly so that the assembly outputs a voltage in accordance with the unique resistance, and a voltage discriminator receives the voltage output and generates a corresponding output indicative of the existing operating states of the switches.

REFERENCES:
patent: 3371254 (1965-10-01), Hagfors
patent: 3375435 (1966-03-01), Baugher
patent: 4190246 (1980-02-01), Sasuga

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