A Simple Resonant Frequency Tracking Technique for LLC Resonant Converters

Poonahela I., Bayhan S., Abu-Rub H.

6th IEEE INTERNATIONAL CONFERENCE on RENEWABLE ENERGY RESEARCH and APPLICATIONS (ICRERA 2017), California, Amerika Birleşik Devletleri, 5 - 08 Kasım 2017, ss.296-299 identifier identifier

  • Cilt numarası:
  • Doi Numarası: 10.1109/distra.2017.8191282
  • Basıldığı Şehir: California
  • Basıldığı Ülke: Amerika Birleşik Devletleri
  • Sayfa Sayıları: ss.296-299


A LLC resonant converter (LLC-RC) has been widely used in DC/DC converters for the benefits of high efficiency and high power density. The efficiency of a LLC resonant converter is greatly dependent on the switching frequency. In order to achieve higher efficiency, the switching frequency should be equal to the resonant frequency. This paper presents a novel resonant frequency tracking technique for LLC resonant converters (LLC-RC) based on the detection of zero current duration on the secondary side of the converter. The LLC-RC is controlled by the proposed technique to achieve resonant frequency tracking automatically under the various operating condition. To verify the control technique, a 5 kW LLC-RC was designed and tested through a Matlab/Simulink environment.