Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1982-05-14
1983-04-12
Weldon, Ulysses
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318 65, 318256, 318280, H02P 122
Patent
active
043799850
ABSTRACT:
A bipolar driver controls the operation of a reversible polarity load such as a motor. The driver links one terminal of the motor with either a positive or a negative potential power supply in response to processor command signals comprising a combination of logic levels appearing at a pair of driver input lines. The input lines are monitored to detect the presence of an illegal code combination which would otherwise function to simultaneously interconnect the load terminal with both positive and negative power supplies. The load terminal is linked to the power supplies by a separate power transistor for each power supply. Each power transistor is biased into conduction through a drive transistor. Upon detection of an illegal code, monitoring logic generates a signal which interrupts the emitter circuit of each of the drive transistors to inhibit both power transistors.
REFERENCES:
patent: 3144598 (1964-08-01), Merritt
patent: 3146390 (1964-08-01), Wolff
patent: 3480849 (1969-11-01), Thornsen et al.
patent: 3525883 (1970-08-01), Iordanidis
patent: 3568024 (1971-03-01), Robbins
patent: 3965402 (1976-06-01), Mogle
patent: 4079298 (1978-03-01), Prager
patent: 4124811 (1978-11-01), Anderson
Pitney Bowes Inc.
Scolnick Melvin J.
Scribner Albert W.
Vrahotes Peter
Weldon Ulysses
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