A Family of High Efficiency Variable Frequency Soft-Switching Off-line DC-DC Converters

A Family of High Efficiency Variable Frequency Soft-Switching Off-line DC-DC Converters

  • Date of Publication 12 May 2009
  • Meeting end date 14 May 2009
  • Location Nuremberg, Germany
  • Conference/Proceedings International Conference for Power Conversion, Intelligent Motion & Power Quality, May 2009. PCIM Europe ‘09. Conference Proceedings 2009

The paper presents a family of off-line DC-DC converters for medium to high power delivering more than 95% efficiency for output levels of 12 to 48 V. The multi-layer PCB solution allows for low profile converters with multiple applications, from AC-DC adapters to TELECOM and computing. The main gain of this new design approach consist in using variable frequency topology with high frequency zero voltage switching (ZVS) and zero current switching (ZCS) for primary switchers. Theoretical considerations and practical results are presented for high frequency and high voltage soft-switching. The goal of the designs is to maintain a reasonable temperature rise of the multi-layer PCB board while delivering up to 90 W and respective 750 W power in a reduced volume and low cost.