Single-supply circuit measures -48V high-side current
by Wenshuai Liao, Analog Devices, Beijing, China, Stephen Lee, Analog Devices, Wilmington, MA, and Yanhui Zhao, Beihang University, Beijing, China; Edited by Charles H Small and Fran Granville, EDN, Feb 21 2008
Focus:
Circuit uses difference amplifier and op amp to measure negative currents ranging from -48 V to -60 V, yet operates from a single, positive supply rail.
What you’ll learn:
- How to measure negative high-side currents using a circuit powered by a positive supply rail
- How to avoid the need for dual, positive and negative supplies when measuring -48-V high-side currents
Notes:
An EDN Design Idea
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