Electricity: power supply or regulation systems – Inrush current limiters
Patent
1996-11-05
1998-03-31
Krishnan, Aditya
Electricity: power supply or regulation systems
Inrush current limiters
G05F 508
Patent
active
057342610
ABSTRACT:
An input protection circuit for an instrumentation system which receives an input signal and which is adapted for providing a current and/or voltage limited version of the input signal to a measurement system. The input protection circuit of the present invention utilizes an optocoupler and also includes circuitry which protects the optocoupler from damage if an over-voltage condition is detected. The input protection circuit includes a comparator which is operable to disable or turn off the optocoupler when the current limited version of the input signal exceeds a preset value. The input protection circuit preferably includes a resistor connected in parallel with the optocoupler. which provides an alternative path for the input signal when the optocoupler has been cut off. The present invention thus provides an improved input protection circuit which also protects the optocoupler from damage if an over-voltage condition is detected, but still allows the input signal to be measured during this time.
REFERENCES:
patent: 5268631 (1993-12-01), Gorman
patent: 5479090 (1995-12-01), Schultz
patent: 5541500 (1996-07-01), Krahl
Hood Jeffrey C.
Krishnan Aditya
National Instruments Corporation
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