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  • Scalable Multi-Pack Smart Battery ChargerReference Design

    • TIDUEB2A July   2022  – July 2022

       

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  • Scalable Multi-Pack Smart Battery ChargerReference Design
  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1  Power Multiplexing Circuit Design Parameters
      2. 2.2.2  Input Connections and Filter
      3. 2.2.3  Reverse Polarity Protection
      4. 2.2.4  Battery Charger Input
      5. 2.2.5  Battery Ideal Diode-OR
      6. 2.2.6  Input and Battery Switchover Mechanics
      7. 2.2.7  LM74800 (U1) HGATE
      8. 2.2.8  Battery LM74800 HGATE
      9. 2.2.9  BQ25731 Design Considerations
      10. 2.2.10 BQ25731 Component Selection
      11. 2.2.11 ILIM Circuit
      12. 2.2.12 MCU and I2C Bus Design Considerations
      13. 2.2.13 MSP430FR2475
      14. 2.2.14 I2C Bus Overview
      15. 2.2.15 MSP430 Connectors
      16. 2.2.16 MSP430 Power Supply
      17. 2.2.17 Sensing Circuits
      18. 2.2.18 Current Sensing
      19. 2.2.19 Voltage Sensing
      20. 2.2.20 Input Comparators
      21. 2.2.21 Software Flow Chart
    3. 2.3 Highlighted Products
      1. 2.3.1 BQ25731
      2. 2.3.2 LM7480-Q1
      3. 2.3.3 LM74700-Q1
      4. 2.3.4 MSP430FR2475
      5. 2.3.5 PCA9546A
  8. 3Hardware, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1 Adaptive Charge Current Limiting
      2. 3.3.2 Battery ORing System
      3. 3.3.3 Circuit Switchover From Adapter to Battery
  9. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  10. 5Revision History
  11. IMPORTANT NOTICE
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DESIGN GUIDE

Scalable Multi-Pack Smart Battery ChargerReference Design

Description

This reference design is a smart high-efficiency charger design for dual smart battery packs of up to 100 Watt hours (Wh) implemented as 1S–5S Lithium-ion (Li-ion) batteries in a parallel configuration. To achieve this an onboard MCU manages the communication and safety features needed for the charging system to interface with a battery pack designed to the Smart Battery Data Specification Revision 1.1 (SBD 1.1). This communication allows the MCU to initialize two independent battery charger ICs to the correct charging parameters, as well as inhibit charging when the batteries are outside of safe specifications. This design also demonstrates a high-efficiency system power MUX for selecting between the input adapter and efficient discharge of the two smart batteries simultaneously. These features make this reference design highly applicable for portable medical devices, such as oxygen concentrators.

Resources

TIDA-010240 Design Folder
BQ25731 Product Folder
LM7480-Q1, LM74700-Q1 Product Folder
MSP430FR2475, PCA9546A Product Folder
Ask our TI E2E™ support experts

Features

  • Provides a complete drop-in battery charging system for charging and communication with two smart Lithium-Ion batteries
  • Supports 1S–5S packs with charge currents of up to 16-A per battery
  • Onboard MCU for charge control and upstream communication with system host
  • Onboard MCU communicates with smart battery gauges to read charging information and monitor alerts

Applications

  • Oxygen concentrator
  • CPAP machine
  • Multiparameter patient monitor
  • Dialysis machine

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