Battery tester reference design for high current applications

14th September 2018
Posted By : Enaie Azambuja
Battery tester reference design for high current applications

Li-Ion battery formation and electrical testing require accurate voltage and current control, usually to better than ±0.05% over the specified temperature range. This reference design proposes a solution for high-current (up to 50A) battery tester applications supporting input (bus) voltages from 8V–16V and output load (battery) voltages from 0V–5V.

The design utilises an integrated multi-phase bidirectional controller, LM5170, combined with a high precisiondata converters and instrumentation amplifiers to achieve charge and discharge accuracies of 0.01% full scale.

To maximise battery capacity and minimise battery formation time, the design uses highly-accurate constant current (CC) and constant voltage (CV) calibration loops with a simplified interface. All key design theories are described guiding users through the part selection process and optimisation. Finally, schematic, board layout, hardware testing, and results are also presented.

Features

  • Battery test subsystem with calibration control achieving 0.01% full scale current control accuracy
  • Supports up to 50A applications with an input voltage (bus) from 8V–16V and output load (battery) from 0V–4.5V (5V max)
  • LM5170 bidirectional buck, boost controller
  • Programmable high-precision reference supplied by DAC80004
  • Voltage and current monitoring provided by the ADS131A04 24 bit delta-sigma
  • User friendly control interface

Discover more here.


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