Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1980-01-10
1982-03-09
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307254, 307540, H03K 508
Patent
active
043191452
ABSTRACT:
In a control interface circuit for selectively applying a signal to initiate a function in a control device, such as solid state power controller, there is an optical coupler whose primary side is connected in series with a plurality of impedance elements. The transistor switch elements are associated with the various impedances to selectively modify the amount of impedance in the active circuit between the control input terminals. The transistor switch elements are optically controlled by optical coupler devices receptive of inputs from the control device and are maintained with a means for supplying operating voltage that limits the voltage to a value that can be charged in less than the sampling pulse time.
REFERENCES:
patent: 3842249 (1974-10-01), Geyer et al.
patent: 4086503 (1978-04-01), Fox et al.
patent: 4114054 (1978-09-01), Seo et al.
patent: 4121122 (1978-10-01), Pokandt
patent: 4181863 (1980-01-01), Parker
"Power Controller Breadboard and Development Requirements" (Final Report) No. 2-57110/4R-3195, Mar. 75, by Perkins et al. pp. cover-x, 22, 24 & 28.
Aerospace Technology Development of Solid State Remote Power Controllers for 300 VDC with current ratings of one & two amps, by Billings No. NASA CR-135199, Jun. 1977, pp. cover-XII and 3-19-3-25.
Davis B. P.
Miller, Jr. Stanley D.
Telfer G. H.
Westinghouse Electric Corp.
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