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  • Session: High-Power DC-DC Converters
  • D02.4 – A Resonant Tank Design for LLC Resonant Converter Considering Leakage Inductance of Current Doubler Rectifier
  • Thursday, February 29, 2024
  •  11:30 AM – 1:30 PM PST
  •  Location: Grand Ballroom AB
  • Koki Mori, Bachelor (he/him/his)Engineering
    Nagasaki University Presentation  Paper
  • LLC resonant converters are widely used in various applications because of their relatively simple structure and high efficiency. However, the problem is a decrease in efficiency due to an increase in the current on the secondary side of the transformer when the difference between input and output voltage is large. As the solution, there is a technique of adapting a current doubler rectifier with an inverse-coupled inductor. However, the leakage inductance of the inverse-coupled inductor in the current doubler rectifier affects the resonant tank, and although other studies have been designed to eliminate this effect, the leakage inductance is never completely zero, and the effect on the resonant tank cannot be ignored. Therefore, this paper proposes a design in which leakage inductance, which can-not be ignored, is actively utilized. New resonant characteristics are presented based on FHA analysis, and actual measurement on a 60V/10A output prototype shows a 1.36% improvement in efficiency compared to convention-al LLC.

  • Session: Utility-Interface Converters
  • D04.6 – A Simplified Control Technique for High Power Factor Corrected Line-Interactive Ups with Tri-Port Transformer
  • Thursday, February 29, 2024
  •  11:30 AM – 1:30 PM PST
  •  Location: Grand Ballroom AB
  • Kazuhide Domoto, PhDEngineer
    Nishimu Electronics Industries Co.,Ltd. Presentation  Paper
  • This paper proposes a line-interactive UPS that can simultaneously achieve high efficiency and high power factor. A tri-port transformer (TPT) can isolate the commercial power supply, battery, and load with a single component, enabling high reliability, high efficiency, and low noise. This paper proposes a high power effi- ciency and power factor Line-Interactive Tri-port UPS. The experiments confirmed that the proposed method could achieve an input power factor of 0.98 and a power efficiency of 87.5%. In addition, the system was veri- fied to be highly reliable, with a seamless transition to backup operation in the event of an input failure.