BECOME

The project was there­fore prima­rily concerned with explo­ring the limits of feasible swit­ching frequen­cies in rela­tion to the planar trans­for­mers used. The high swit­ching frequen­cies are required to achieve the desired dyna­mics in the power flow. Compact solu­tions with swit­ching frequen­cies of up to 500 kHz were success­fully demons­trated. 

OBJECTIVES:  

• The project aimed to achieve the follo­wing objec­tives, which were achieved in all key areas: 
• Lite­ra­ture re­search to deter­mine the state of the art in the field of high-frequency reso­nant conver­ters 
• Construc­tion/ prepa­ra­tion of a test envi­ron­ment for high-frequency reso­nant conver­ters 
• Deve­lop­ment of compact planar trans­for­mers for the frequency range of 500kHz and a power of 14kW in the first version and with 22.5kW in the improved industrialized version. 
• Compa­rison of stranded wire windings with multi­layer PCB solu­tions 
• Design of a reso­nant capa­citor board with minimal resis­tance increase due to skin and proxi­mity effects 
• Protec­tion of voltage tolerances when opera­ting in DCX mode (opera­tion with fixed frequency) 

PAPER:  

Exploiting the Depth: Design, Analysis, and Implementation of High-Power-Density High-Frequency Transformers for One Rack Unit CLLC DCX Converters