Output circuit having a fail-safe function

Details Output circuit having a fail-safe function Output circuit having a fail-safe function

1989-03-27

1991-07-02

Scott, J. R.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

318 59, 388812, 388820, H01H 4700

Patent

active

050290401

ABSTRACT:
An output circuit having a fail-safe function with: a control signal generating circuit which generates a control signal to control the current of a load and includes an operational amplifier which amplifies a difference between a control value and a feedback value to produce the control signal; a drive circuit which drives a load according to the control signal from the operational amplifier; an output current detecting circuit for detecting a current in a load solenoid and adding an offset current to the detected current, with the output of the output current detecting circuit being fed back to the control voltage generating circuit as the feedback value.

REFERENCES:
patent: 4023659 (1977-05-01), Arnold
patent: 4214290 (1980-07-01), Sloan
patent: 4417187 (1983-11-01), Bateika
patent: 4532570 (1985-07-01), Thornley et al.

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