H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/60
H02P 7/00 (2006.01) H02H 7/08 (2006.01)
Patent
CA 1143430
BIPOLAR DRIVER WITH ILLEGAL CODE DETECTOR ABSTRACT OF THE DISCLOSURE A bipolar driver controls the operation of a reversible polar- ity 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.
352742
Macrae & Co.
Pitney-Bowes Inc.
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