Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1989-04-20
1991-11-26
Miller, Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307270, 307261, 328 28, 372 38, H03K 342, H03K 500, H03K 508, H01S 300
Patent
active
050685457
ABSTRACT:
An input circuit for conditioning a control signal having a variety of waveforms and voltage levels, comprises a pair of input terminals having a metal oxide varistor connected thereacross. One terminal is connected to the base of a transistor thru a resistor, the emitter of the transistor driving an opto-coupler for isolating the control signal from a micro-processor which receives the control signal over an inverter having a schmitt trigger input.
REFERENCES:
patent: 4321487 (1982-03-01), Huykman
patent: 4484331 (1984-11-01), Miller
patent: 4645948 (1987-02-01), Morris et al.
Edwards Robert J.
Elsag International B.V.
Marich Eric
Matas Vytas R.
Miller Stanley D.
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