Automotive mA-to-kA range current shunt sensor reference design

12th July 2018
Posted By : Anna Flockett
Automotive mA-to-kA range current shunt sensor reference design

This reference design shows how to detect current from the mA-to-KA range using a busbar-type shunt resistor. The increasing demand of high-capacity batteries in electric vehicles (EVs) and hybrid electric vehicles (HEVs) drives the requirement for larger current spans and highly-accurate current sensors.

Obtaining a good accuracy over three decades (mA to A, 1-100 A, and 100-1000A) is quite challenging due to large amounts of noise in the system. This design solves this problem by using a high-resolution analogue-to-digital converter (ADC) and high-accuracy current shunt monitors from TI.

Features include:

  • Full-scale accuracy of:
    • 0.02% full-scale range (FSR) for <20A and <0.05% FSR for 20A to 1500A at 25°C
    • 0.1% FSR for <20A and 0.25% FSR for 20A to 1500A at 50°C
  • Suitable for 50mA to 1500A range current measurement; configurable to varied current spans
  • High-side sensing and low-side sensing
  • Supports bi-directional current
  • Bi-directional current measurement: -1500A to +1500A.

To find out more click here.


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