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Isolated Open Loop Current Sensing Using Hall Effect Technology in an Optimized Magnetic Circuit Richard Dickinson & Shaun Milano Allegro MicroSystems, Inc. 162 Pembroke Rd. Concord NH, 03301 USA Tel: 001 (603) 228-5533 Fax: 001 (603) 224-2466 Abstract: With the expected arrival of a 42V parallel bus power supply aboard automobiles and new energy efficiency standards being imposed on most household appliances, there is a growing need for current sensing as a means of monitoring and controlling power consumption. There are three rival technologies that are typically used for measuring current: sense resistors, Hall effect sensors and current transformers.
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