Detection of current leakage through opto-switches

Details Detection of current leakage through opto-switches Detection of current leakage through opto-switches

2011-03-22

2011-03-22

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

C361S093700

Reexamination Certificate

active

07911754

ABSTRACT:
Apparatus for testing an opto-switch includes a first sense resistor coupled between a power source and an input of the opto-switch, and a second sense resistor coupled to an output of the opto-switch. A test circuit is coupled to sense a first current flowing through the first sense resistor and a second current flowing through the second sense resistor and to generate a test signal responsively to a relation between the first and second currents. A controller is coupled to receive the test signal and to perform a protective action when the test signal exceeds a predetermined limit.

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