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| Using Allegro Current Sensors in Current Divider Configurations for Extended Measurement Range | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| a 0 to ±300 A measurement range. A simulation of this is shown in figure 16. The resulting signal-to-noise ratio is almost 1.5 times that realized when using a single ACS754 with an uninterrupted current shunt path. If a larger output signal range is desired, the gain may be adjusted by varying the resistor value ratio R8 / R7. Although the ACS754-150 was used in this case study, by using dual ACS754-200 devices, up to 400 A may be measured with this same configuration and interface circuit. In all configurations, careful attention must be paid to safely matching the bus bar size and heat sinking capacity with the operating current levels. CONCLUSION Through careful board design of split current paths, and by programming device sensitivity | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| ITot (A) Figure 16. Simulation of Output. Results using ACS754-150 sensors in suggested circuit for combining outputs (figure 8). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| after assembly if needed, the Allegro ACS7xx family of devices can be used to measure extended current ranges. For further assistance with a split current path design, please contact your local Allegro sales office and consult with a field applications engineer. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Visit the Allegro Web site for more information on the current sensor product lines: http://www.allegromicro.com/sf/0704/ http://www.allegromicro.com/sf/0754/ http://www.allegromicro.com/sf/0752/ http://www.allegromicro.com/sf/0750/ The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro products are not authorized for use as critical components in life-support devices or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibilityfor its use; norfor any infringement of patents or other rights ofthirdpar-ties which may result from its use. Copyright © 2005 Allegro MicroSystems, Inc. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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