Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1994-06-28
1997-07-08
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324118, 327 93, G01R 1900, G11C 2702
Patent
active
056465203
ABSTRACT:
An apparatus for sensing current in a switching device having resistive voltage-current characteristics includes a first and second power terminal (typically common or ground) for the application therebetween of an operating potential (or alternatively, power), an impedance connected between the first power terminal and a node, a switching device having its main conduction path connected between the node and the second power terminal for controlling the flow of current through the impedance, at least one sense device coupled to the node, operative to sense or divide the potential at the node to thereby provide a sensing potential, where at least one of the sense devices is switched only during at least a portion of the period when the switching device is turned on, and a voltage reference generating circuit operative to generate a reference voltage for comparison with the sensed potential. A method for sensing current in a switching device having resistive voltage-current characteristics, samples the potential at a node connecting the switching device to the impedance only during at least a portion of the period when the switching device is turned on, to generate a sensed potential, generates a reference potential for comparison with the sensed potential.
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Frank Richard
Inn Bruce Lee
Szepesi Tamas
Karlsen Ernest F.
National Semiconductor Corporation
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