Vishay Intertechnology, Inc.

Components and Methods for Current Measurement

Published by Vishay Intertechnology, Inc.

Current sensing is used to perform two essential circuit functions. First, it is used to measure “how much” current is flowing in a circuit, which may be used for power management in a DC/DC power supply to determine essential peripheral loads to conserve power. The second function is to determine when it is “too much,” or a fault condition. If current exceeds safe limits, then a software or hardware interlock condition is met and provides a signal to turn off the application, as in a motor stall or short circuit condition in a battery. It is essential to choose the appropriate technology with a robust design to properly withstand the extreme conditions that can exist during a fault. The appropriate component performing the measurement function would need to sustain an accurate voltage signal as well as prevent damage to the printed circuit board.

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