05142432 is referenced by 34 patents and cites 11 patents.

A protection circuit which electrically isolates logic level and high-side circuits and detects high side power device fault conditions at the isolated, logic level side of the circuit. When an overvoltage or overcurrent condition occurs at the power switching device, a protection circuit disables the conduction of current through the current carrying terminals of the switching device, preventing damage from occurring to the device. Activation of the protection circuit effects an increased current flow in the secondary and primary coils of the isolation transformer between the low side and high side elements. Voltage at the primary coil of the isolation transformer is monitored by low level circuitry to detect the rise in current, indicating a fault to the system controller upon detection.

Title
Fault detection apparatus for a transformer isolated transistor drive circuit for a power device
Application Number
7/779766
Publication Number
5142432
Application Date
October 21, 1991
Publication Date
August 25, 1992
Inventor
Eric D Schneider
Carmel
IN, US
Agent
Mark A Navarre
Assignee
General Motors Corporation
MI, US
IPC
H02H 9/04
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