Shunt-Based ILF Current Sensor for Low Currents Ideal for Frequency Converters and Solar Inverters

Shunt-Based ILF Current Sensor for Low Currents Ideal for Frequency Converters and Solar Inverters

Measurement technology specialist Isabellenhütte has developed a current sensor in the low-amperage range. The new ILF current sensor covers a measurement range of up to 60 amperes and displays the flowing current via the corresponding voltage value on the analogue output. Thanks to its compact IC housing, the ILF current sensor is ideal for SMD mounting. The new ILF is primarily suited for use in frequency converters for industrial applications and solar inverters. The ILF’s current measurement is based on Isabellenhütte’s proven shunt technology. Conventional current sensors from other manufacturers in the same measurement range are largely based on the magnetic principle. Using this method, a current is detected by the magnetic field of a live conductor. Compared to products that use the magnetic principle, shunt-based current measurement results in greater accuracy. “We are comparable to magnetic sensors in terms of price. However, with shunt technology, we measure current accord-ing to Ohm’s law. That means we don’t have to rely on a magnetic field, which is prone to interference. Isabellenhütte sensors are therefore much more precise,” says Jens Hartmann Sales Director ISAscale at Isabellenhütte. ILF’s relative error amounts to deviation from the measurement value of less than one per cent over the entire measurement range. The ILF also ensures high continuous output, outstanding long-term stability and high continuous load and pulse capacity.

Technical details ILF:

  • Supply voltage: 3.3 V or 5 V 
  • Current measurement range: ± 60 A / ± 30 A
  • Power loss: < 3 W
  • Current accuracy: 1.0 %
  • Temperature measurement range: -40 °C to +125 °C
  • Reference voltage Vref: 1.8 V to 2.5 V
  • Solder temperature: 260 °C

Compact plug-and-play solution
The ILF is designed for two different current ranges: ± 60 amperes und ± 30 amperes. It is compatible with supply voltages of 3.3 V or 5 V. The pins of the ILF sensor consist of two load current contacts as well as four signal and supply communication contacts. Isabellenhütte designed the ILF to be a ready-to-use solution consisting of shunt and semiconductor technology in one-chip housing. The ILF is available in a compact IC housing with standard SOP20 dimensions. The current sensor is compatible with any A/D converters, and the circuit board mounting can be carried out automatically.

About Isabellenhütte Heusler
Isabellenhütte Heusler GmbH & Co. KG has been owned by the Heu-sler family since 1827. Today it is one of the world’s leading manufacturers of low-ohmic precision and power resistors. The company also produces precision alloys and measurement technology products. Isabellenhütte’s measurement technologies are leaders in the field of shunt-based power measurement. Its precision measurement systems are marketed under the ISAscale® brand. The company employs some 720 people at its headquarters and production location in Dillenburg (Hesse, Germany). 

More information: Isabellenhütte