How to Design a 29.4V 4A Charger Circuit for Lithium Ion Battery Packs?

The discussion focuses on designing a 29.4V 4A charger circuit for lithium-ion battery packs, specifically for a 7-cell series configuration (7 cells × 4.2V = 29.4V) commonly used in applications such as e-bicycles and DC motor-driven devices like powered chairs. Key design considerations include the battery capacity (e.g., 2600mAh per cell), input voltage, load conditions during charging, and efficiency factors such as parasitic elements. For practical design, selecting an appropriate battery management IC is critical. A recommended approach is to use integrated PMIC battery charger ICs suitable for 1 to 7 series cells, with Texas Instruments’ BQ24630 highlighted as a viable candidate. The design can be approached at either schematic or block level, with options including DC-DC converter ICs combined with external components and possibly delta-sigma converters for charge monitoring. Off-the-shelf solutions exist, but custom design requires careful component selection and theoretical analysis.
Summary generated by the language model.