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For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
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This article describes a circuit arrangement to monitor current and signal other circuitry to shut off the current if its magnitude exceeds predefined limits.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
67% of the total text.
Page 1 of 1
Multi-circuit Over Current Monitor
This article describes a circuit arrangement to monitor current and signal
other circuitry to shut off the current if its magnitude exceeds predefined limits.
In order to diagnose electrical problems in the automobile, it is a requirement
to have a probe card which has the ability to ground probe lines as one of its
functions. The grounding of a line may be used as a signal, or it may be used to
complete an electrical circuit for a load in the car. In some cases excess current
can be generated due to probe lines being connected directly to a battery. The
circuit arrangement disclosed herein monitors current in multiple circuits for the
purpose of limiting it to a safe magnitude.
The figure illustrates an embodiment of the present monitor. The main
elements in the circuitry are the toroid and U2 (a linear Hall-effect element).
Each circuit whose current is monitored has one or more loops of wire wrapped
around the toroid. Four circuits are shown being monitored, but the number of
circuits is limited only by the number of wires that can be looped through the
toroid. The Hall element is positioned in a gap in the toroid where the field is
concentrated due to the current in the wires.
If current is flowing through one of the four current loops (loop 1, for
example), a magnetic field is generated in the toroid whose magnitude is a
function of the current in the current loop. The linear Hall-effect element U2,
being in the air gap of...