Surge protection circuit, in particular for inputs of integrated

Details Surge protection circuit, in particular for inputs of integrated Surge protection circuit, in particular for inputs of integrated

1998-07-02

2000-02-29

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transient responsive

361 916, 361119, H02H 322

Patent

active

060317051

ABSTRACT:
A surge protection circuit that can be used, in particular, for monitoring and protecting a diagnostic interface, such as, for example, the SAE J 1708 diagnostic interface. A shared surge detection device, which generates a switch-off threshold voltage, receives the input signals of two input lines with the help of a diode combination. When a surge condition occurs in at least one input voltage, the surge detection device places one of the MOS field-effect transistors connected into the input line in a non-conductive state so that a high-resistance interrupt of the input signal lines, connected on the output side to an integrated interface circuit, is produced. In normal operation, i.e., when no surge condition occurs, the two MOS field-effect transistors produce a low-resistance, i.e., basically no-loss, conduction of the input signals in both directions.

REFERENCES:
patent: 5198957 (1993-03-01), Welty et al.
patent: 5440441 (1995-08-01), Ahuja

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