SDAA145 October   2025 TPSI31P1-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2System Challenge on DC-Link Capacitor Pre-charge
  6. 3System Approach
    1. 3.1 Isolated Switch Driver
    2. 3.2 Active Pre-charge Controller
    3. 3.3 Discrete High Voltage Buck Design
    4. 3.4 Independent Isolated DCDC Boost Design
    5. 3.5 Integrated Pre-charge Design
      1. 3.5.1 Bidirectional High-Voltage to Low-Voltage (HV-LV) DCDC
      2. 3.5.2 Battery Heater
  7. 4Summary
  8. 5Terminology
  9. 6References

3.5 Integrated Pre-charge Design

Rather than implementing dedicated hardware, automotive manufacturers can leverage existing vehicle ECUs, such as the Battery Management System (BMS), HV-LV DC/DC converter—to orchestrate the pre-charge sequence through sophisticated software algorithms. By embedding pre-charge functionality within the vehicle's existing electronic architecture, manufacturers can achieve more efficient system design while maintaining robust protection for high-voltage powertrain components.