Current sensor suppresses interference fields

6th February 2020
Mick Elliott

A coreless open loop current sensor for accurate and stable measurements in industrial applications is now being sampled by distributor Rutronik UK.

Infineon’s XENSIV TLI4971 current sensor covers measurement ranges from ± 25A to ± 120A and offers great design flexibility thanks to individually programmable parameters such as current range, overcurrent threshold and output mode. It will be launched in October.

With its differential measuring principle, the current sensor suppresses interference fields from its immediate environment.

In addition, a market-proven Infineon technology compensates temperature fluctuations and mechanical stress.

This means that the sensitivity error of the measurement is reduced to only 2% at room temperature, with single point in-system calibration to even lower values. The results of the measurement are provided as an analogue output voltage.

For fast overcurrent detection with a low latency, the sensor contains two digital outputs (OCD1, OCD2).

When the individually programmable over-current threshold is exceeded, the signal can be used for pre-warning or for system shutdown. In addition, the sensor reliably identifies and reports over- or under-voltage condition for the supply voltage.

The TLI4971 offers excellent thermal performance for currents up to 120A thanks to its special current rail layout and incorporates galvanic isolation for voltages up to 1.1kV.

With its performance data and the 120kHz bandwidth, the compact sensor in a 8x8x1mm leadless TISON-8 package is ideal for a wide range of applications, including 50kW electric drives, inverters, robots, chargers, battery management systems, smart metering, power tools and white goods.

The TIL4971 joins Infineon’s TIL4970 current sensor on the company’s exhibit at the embedded world exhibition in Nuremberg (February 25-27).

The TIL4970 is extremely robust against external magnetic fields thanks to implemented stray field suppression and is also suitable for fast overcurrent detection at a pre-configurable level.

This allows the control unit to switch off independently of the main measurement path and protect power consumers from damage.

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