Current sensor achieves high accuracy by utilizing the AMR effect
Installation tolerances in the application can be compensated for by means of zero and sensitivity calibration which transforms into a high system accuracy. The sensor system embraces the sensor cell, the signal processing unit and two permanent magnets which generate a magnetic auxiliary field for the sensor element.
The E524.5 utilizes the Anisotropic Magneto-Resistive (AMR) effect. It measures the magnetic field generated by the primary conductor with the sensitive axis being located at the level of the sensing element. The size of the AMR effect makes the use of a flux concentrator redundant. The fast amplifier circuits in the closed loop circuit enable a high bandwidth of more than 500kHz. This in turn enables detection of the real value of pulse edges. The typical deviation is 1.5% FS across the entire temperature range from -40°C through +125°C. This is significantly better than the accuracy of Hall effect sensors (typ. about 5% FS).
A product-specific lead frame along with a sophisticated packaging technology makes it possible to implement the sensor as a system-in-package solution. All system components for primary current value acquisition are integrated in a JEDEC compatible SOIC16 package by means of an industry standard molding process. Additional pick-and-place processes as well as soldering steps are not necessary.
The difference in the magnetic field is generated by placing the primary conductor beneath the sensor package forming the shape of a U. By varying the primary conductor geometry the required differential field at the sensor can be adjusted according to the specific requirements of the application. Thus, only one current sensor is required for a wide range of primary currents.
For more information visit www.elmos.com
- Smart power switch replaces discretes in powertrain and automotive body electronics
- TTI now supports Molex' Imperium connector system
- Allegro rolls automotive-grade current sensors, receives ISO 26262 certification
- MEMS acceleration sensor widens application spectrum in vehicles
- Radar-based sensor network helps drivers finding a parking spot
- Infineon: CAN FD success goes at the expense of FlexRay
- Surface mount rotary position sensors maximise precision at 1% linearity
- Rugged Hall-sensor throttle position sensor, in distribution
- Speed/direction Hall sensor IC detects hysteresis
- Slim-fit diet for Hall-effect sensors
- Infineon, Hella make radar sensor more affordable
- Test stand puts level sensors through their paces
- Thermopile infrared array sensor tracks multiple objects
- Position data via CAN bus
- Triple LED controller for rear lamps
- Auto chip market: upheaval ahead
- Delphi selected to build Audi’s autopilot computer
- MOST – a gigabit data backbone for future car generations?
- Is head-up display future ADAS screen?
- Automotive lighting design software models perception by human eye
- Automotive chip reliability: A matter of design methods
- How will deep learning change SoCs?
- Magneti Marelli revs up F1, motorcycle racing
- Study: Automotive industry leads digital revolution
- Multi-function integrated FET switch replaces automotive relays
- The car's the star...
- Fraunhofer launches test centre for high-voltage batteries
- MINI giving drivers a peek at 'augmented reality'
- MOSTCO demos integration of MOST bus with Autosar
- Rare earth magnets still optimum choice, says motor design expert
- Intel helps to Turbocharge Infotainment Systems Designs
- Making cars safer through technology innovation
- Supplying DC input power for HEV testing
- NSR Noise Suppressors: Wirewound Resistors
- Virtual Hardware “In-the-Loop”: Earlier Testing for Automotive Applications
- Open Standards and Product Differentiation