Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1982-09-07
1984-10-16
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
361 30, G05B 902
Patent
active
044777531
ABSTRACT:
A logic circuit (34) is provided for preventing the application of energizing voltage to a positioning motor in the case of a circuit failure in the drivers stage of a control system. An equality gate provides a signal to each AND gate corresponding to a failure detection criterion whenever signals of the same level are present at the respective transistors controlling operation of the motor into opposite directions. At one AND gate a signal is provided if either of the transistors is conducting, indicating a failure if there is no control signal. At the other AND gate a signal is provided if either terminal of the motor is connected to energizing potential, likewise indicating a failure if no control signal at a transistor input is present. If either AND gate responds the equivalent of a control signal is applied to a pair of diodes to both of the transistor inputs, thereby blocking the motor.
REFERENCES:
patent: 3914675 (1975-10-01), Konrad
patent: 4146801 (1979-03-01), Vali et al.
patent: 4388571 (1983-06-01), Tada et al.
Ratzel Rudiger
Schneider Erich
Dobeck B.
Robert & Bosch GmbH
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