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
- Power supply IC protects automotive antenna amplifiers
- Programmable Hall effect current sensor
- Camera sensor for ADAS applications offers high dynamic range
- MEMS sensor measures acceleration, yaw rate in six axes
- "No car will be an island"
- Riedon targets low cost current sensing applications with low ohmic value resistors
- Automotive applications drive magnetic sensor demand
- Safety IC has pressure sensor inside
- Proximity and gesture recognition sensors spread to automotive dashboards
- Starter Current Module, DC/DC converter stabilize power in Mild Hybrids
- Next generation wheel balancing transducer is fully watertight
- Transmissive optical sensors target encoder applications
- Factory-programmable linear Hall-effect sensor ICs for high-bandwidth applications
- Bosch highlights radar technology for safety-relevant driver assistant systems
- High-precision Hall effect sensors come in ultra-small package
- Jaguar docks on to Intel for next-gen infotainment systems
- Interface integrates e-vehicles into smart grid
- Kvaser proposes backward-compatible, high-bandwidth CAN version
- Women demand different connectivity functions in the car
- Smart cars offer "once in a generation chance" to UK industry, experts say
- Get your digital copy of EETimes Europe
- EV market is much more than passenger cars - and it's booming
- Emergency Steer Assistant can avoid collisions
- MOST 150 Star topology interconnects driver assistant systems
- Faurecia, Magneti Marelli jointly integrate tablets and smartphones into cars
- Field test fathoms out economic potential for electric mobility
- Volvo starts large test with robot cars on public roads
- Researchers significantly improve lithium-air batteries
- Automotive drives new processor architectures
- Haptic feedback touchpad contributes to driving safety