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 System Approach

Multiple pre-charge designs exist in the market, either using specialized pre-charging circuits or leveraging existing circuits within HEV/EV systems. This application note examines the operational principles of various designs and the primary devices offered by Texas Instruments.