Driver circuit with feedback for limiting undershoot/overshoot a

Details Driver circuit with feedback for limiting undershoot/overshoot a Driver circuit with feedback for limiting undershoot/overshoot a

1990-08-27

1992-06-09

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

379331, 379412, H01H 4700

Patent

active

051212846

ABSTRACT:
A drive circuit suitable for driving an inductive load such as an isolation transformer is disclosed having a driver stage and associated feedback circuitry. The driver stage has at least one output for connecting to the load and is switchable between a drive mode and an idle mode of operation. In the drive mode of operation, the driver stage produces a data output signal at the output which corresponds to a data input signal received by the driver stage. In the idle mode, the driver stage produces an idle signal, in response to a control signal, which functions to discharge the conductive load. The feedback circuit produces the control signal in response to the idle signal and adjusts the control signal so that the idle output signal will approach a predetermined neutral level. The inductor will proceed to discharge and, once discharged, will shift the idle voltage. The shift in voltage will cause the feedback action to terminte, thereby preventing the feedback action from introducing charging current into the inductor which would adversely effect the transmission of further data.

REFERENCES:
patent: 4680667 (1987-07-01), Petrie
patent: 4737882 (1988-04-01), D'Onofrio
patent: 4764840 (1988-08-01), Petrie et al.
patent: 4845420 (1989-07-01), Oshizawa et al.

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