Title: Fail-safe opto-electronic phase inverting circuits

Abstract: This disclosure relates to a vital type of an optoelectronic phase inverting circuit arrangement employing a plurality of cascaded photon coupled isolators. Each of the photon coupled isolators includes a light emitting diode and an associated light responsive transistor. A source of periodic input signals is coupled to the photon coupled isolators so that electrical energy is converted to light energy by the light emitting diodes to control the conductive conditions of the respective light responsive transistors whereby the periodic input signals are inverted 180.degree. barring the presence of a critical component or circuit failure.

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Inventors: Toth, Charles V. (McKeesport, PA, US)

Application Number: 435679
Filing Date: 1974-01-23
Publication_date: 1976-08-17
Assignee: Westinghouse Air Brake Company (Swissvale, PA)
Primary Class(es): 250/551 250/208.2, 327/109, 327/256, 327/514, 363/148
Other Classes:
US Patent Ref:

3167657	Jan, 1965	Vize	250/208.
3524986	Aug, 1970	Harnde, Jr.	250/551.
3584286	Jun, 1971	Randall	323/119.
3671749	Jun, 1972	Harnde, Jr.	250/208.
3696250	Oct, 1972	Weimer	250/553.
3696389	Oct, 1972	Fenner	250/553.
3717770	Feb, 1973	Dyck et al.	307/117.
3723769	Mar, 1973	Collins	307/311.
3812364	May, 1974	Rougeot	307/117.

Other Refs:
Primary Examiner: Stolwein, Walter
Assistant Examiner:
Attorney: Sotak; J. B., McIntire, Jr.; R. W.