SLUAAW2 July   2024 UCC25800-Q1 , UCC2803-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Main Architecture of OBC Auxiliary Power Supply
    1. 2.1 Flyback Architecture
    2. 2.2 Boost/Sepic Architecture
  6. 311KW OBC Auxiliary Power Supply Power Requirement
  7. 4Low-Cost, High-Performance Auxiliary Power Solution
  8. 5Summary
  9. 6References

1 Introduction

OBC is the main component of new energy vehicles. According to the power level, OBC mainly has single-phase 3.3KW, 6.6KW, and three-phase 11KW, 22KW. Different types of OBC have different topological structures and different number of switch transistors, resulting in different bias power supply solutions. Commonly used auxiliary power types include Flyback, Push-Pull, LLC and DC-DC module. When selecting an auxiliary power topology, a comprehensive trade-off must be made based on system cost, design complexity, efficiency, system EMI and other aspects.