SLYT803B october   2020  – october 2020 BQ24610 , BQ25713 , BQ25790 , LM66100 , LM74700-Q1

 

  1.   1
  2. 1 Introduction
  3. 2 Understanding Battery Packs
  4. 3 Stackability Requirements for Battery Packs
  5. 4 A Multibattery Management System Design
  6. 5 Battery Charging
  7. 6 Battery Gauging and Protection
  8. 7 DC-to-DC Converter or Controller Stage (Boost or Buck-boost Stage)
  9. 8 ORing Control
  10. 9 Load Sharing
  11. 10Conclusion
  12. 11References
  13. 12Related Web Sites

7 DC-to-DC Converter or Controller Stage (Boost or Buck-boost Stage)

Because each parallel path of a 4S4P pack is a combination of four series cells (14.4 V to 16.8 V), the output voltage going to an ultrasound system (front- and back- end units) can be 12 V, 19 V or 24 V. To achieve one of these system voltages, each parallel path in the pack should have a DC-to-DC converter or controller stage (the latter for higher output currents). The converter or controller can be boost or buck-boost, depending on the requirements. In the 4S4P Li-ion battery pack example, a buck-boost controller will work well.