750W High Efficiency and Soft-Switching Off-Line 12 V Converter

750W High Efficiency and Soft-Switching Off-Line 12 V Converter

  • Date of Publication 15 Feb 2009
  • Meeting end date 19 Feb 2009
  • Location Washington, DC, USA
  • Conference/Proceedings Applied Power Electronics Conference and Exposition, February 2009. APEC '09. Conference Proceedings 2009, Twenty-fourth Annual

The paper presents an innovative off-line low profile converter design that delivers 750 W of power at 95%-96% efficiency for nominal input range, 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 design is to maintain a reasonable temperature rise of the multi-layer PCB board while delivering 750 W power in a reduced volume and low cost. The resulting product increases more than twice the power density compared to the standard two stages 400V to 12V power converters and outperforms other one stage solutions in a 125 x 70 mm2 footprint with only a 18 mm profile.