Key Roles and Development of Transformers in AI Server Power Supplies

Core Functions & Types

Transformers are fundamental in AI server power systems, operating distinctly from molded inductors:

• Molded Inductors: Handle DC power stabilization and filtering in voltage conversion circuits
  
• Transformers: Manage AC/DC conversion, voltage transformation, and critical electrical isolation
  

Primary Applications

1. Power Supply Units (PSUs)
   

• High-frequency transformers serve as the core component in AC/DC conversion
  
• Enable efficient voltage reduction (e.g., 220V AC to 12V DC)
  
• Provide essential safety isolation between high-voltage input and low-voltage output
  
• Support high power density through planar transformer technology
  

2. Communication & Interface Circuits
   

• Network transformers in Ethernet ports ensure signal coupling and electrical isolation
  
• Prevent ground potential differences between connected devices
  
• Enhance signal integrity in high-speed data transmission
  

Industry Transformation

AI servers have elevated magnetic components from standard parts to strategic elements:

1. Design Evolution
   

• Shift from standard products to custom co-designed solutions
  
• Early collaboration between component suppliers, chip designers, and server manufacturers
  

2. Performance Metrics
   

• New focus on high-frequency core losses and thermal management
  
• Emphasis on power density and dynamic response capability
  
• Traditional parameters (inductance, DCR) becoming secondary considerations
  

3. Supply Chain restructuring
   

• Formation of technology alliances between AI chip leaders and magnetic component suppliers
  
• Break from traditional linear supply chain models
  

Future Directions

• Package Integration: Embedding magnetic components directly into chip packaging
  
• Hybrid Integration: Combining magnetic and semiconductor technologies
  
• Material Innovation: Transition from ferrites to advanced metal alloys
  

Conclusion

Transformers and molded inductors play complementary, indispensable roles in AI server power systems. While inductors refine DC power quality, transformers enable essential AC/DC conversion and safety isolation. The ongoing evolution of magnetic components continues to drive improvements in power density, efficiency, and system reliability for AI infrastructure.