Control system including a switching circuit for ensuring proper

Details Control system including a switching circuit for ensuring proper Control system including a switching circuit for ensuring proper

1991-05-06

1994-05-31

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 79, H02H 324

Patent

active

053174704

ABSTRACT:
An arrangement for ensuring that a proper control level for a controlled unit is maintained when a supply voltage is removed from a control unit of a control system includes a switching circuit coupled between the control unit and the controlled unit. The controlled unit couples the control signal generated by the control unit to the controlled unit when the supply voltage is present and is responsive to the absence of the supply voltage for decoupling the output of the controlling unit from the input of the controlled unit. In this manner, a current path established by a protection circuit within the control unit when the supply voltage is removed is decoupled from the controlled unit and does not adversely affect the operation of the controlled unit.

REFERENCES:
patent: 4527194 (1985-07-01), Sirazi
patent: 4532457 (1985-07-01), Haferl
patent: 4668932 (1987-05-01), Drori et al.
patent: 5029005 (1991-07-01), Morris, Jr.

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