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Magnetic Field Sensors
Current Sensor KMC 05
Sensors in thin film technology
HL-Planartechnik GmbH
Hauert 13, D - 44 227 Dortmund, Tel.: +49 (0) 231/97400, Fax.: +49 (0) 231/974020
Internet: http://www.hlplanar.com E-Mail: service@hlplanar.de
Function principle
Magnetoresistive materials can change their resistivity in an external magnetic field. The
variation of the resistivity is determined by the rotation of magnetisation with respect to the
direction of the current flow. Permalloy (Ni81Fe19) is commercially used as
magnetoresistive material. The relative change of resistivity is 2-3 % for this material. The
high sensitive and small size sensor consists of a silicon chip coated with thin film
permalloy stripes. These stripes form a Wheatstone bridge, whose output voltage
depends on the magnetic field.
Characteristic
The sensor chip measures the magnetic field generated by an internal current-carrying
conductor. The current sensor has an integrated permanent magnet. No external auxiliary
field Hx is required. A direct or alternating current IM up to 5 A can be detected.
Package: mod. SM-8
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