17-Cell battery monitoring analog front end with high sampling accuracy
A high voltage multiplexer of 17-cell battery monitoring analog front end (AFE) is adopted to acquire each cell voltage for accurate monitoring. Besides, a current compensation
Although some battery pack monitoring schemes have increased the number of measurable channels in a chip for higher voltage battery packs, the issue of accuracy caused by the common mode voltage difference in each unit of series battery pack remains unsolved.
A high voltage multiplexer of 17-cell battery monitoring analog front end (AFE) is adopted to acquire each cell voltage for accurate monitoring. Besides, a current compensation scheme is proposed to tackle the current leakage in each channel to further improve the acquisition accuracy.
Inconsistent extraction currents from different input ports can negatively impact not only the accuracy of battery voltage monitoring for the corresponding channel but also the consistency of discharges for each battery. This can further exacerbate the difference between the state of charge (SOC) of cells.
For instance, in a system application, it is common for the lowest cell to consume more power each time the battery monitoring AFE polls each cell for sensing. This can lead to an imbalance in the state of charge (SOC) of each cell.
PDF version includes complete article with source references. Suitable for printing and offline reading.
Get detailed specifications, case studies, and technical data for our PV container and energy storage solutions.
123 Renewable Energy Street
London EC1A 1BB, United Kingdom
+44 20 7127 4182
Monday - Friday: 8:00 AM - 6:00 PM GMT