Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1982-09-27
1984-12-25
Truhe, J. V.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318256, 318293, 318291, 318287, 307254, 307262, 307454, H02P 122
Patent
active
044906552
ABSTRACT:
A bi-directional driver system for an electrical load operable in response to two independent logic command signals provides a means for selecting the direction of current flow in the load when driven by the external command. A bridge circuit employs inputs to dual transistor switches operating in the saturated mode in series with the electrical load, cooperating with common emitter transistor linear amplifiers and diodes, and biased by the input logic signal so as to drive the load current in a predetermined direction. The circuit provides protection from undesired power supply current surges when logic command signals are applied to both inputs, and from transients due to failure of a saturated transistor switch at one input to cease conducting before the application of a command signal to the second input. Embodiments for inductive loads and annunciator lamps are described.
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National Semiconductor Corp. Special Functions Data Book, 1979 Ed., pp. 9-14, 9-15, 9-16, DS0025/DS0025C, Two-phase MOS clock driver.
Popular Electronics (May 1964, Ed. pp. 78, 79).
Albin Arnold L.
Ip Paul Shik Luen
Sperry Corporation
Terry Howard P.
Truhe J. V.
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