The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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LLC Resonant Converter with Auxiliary Switches Operating Over A Wide Output Voltage Range

넓은 입·출력전압 범위에서 제어 가능한 보조스위치 적용 LLC 공진컨버터

  • Lee, Ji-Cheol (Electrical & Electronics Engineering, Jeonju University) ;
  • Kim, Min-Ji (Electrical & Electronics Engineering, Jeonju University) ;
  • Oh, Jae-Sung (Electrical & Electronics Engineering, Jeonju University) ;
  • Kim, Eun-Soo (Electrical & Electronics Engineering, Jeonju University) ;
  • Kook, Yoon-Sang (PACTECH CO.,LTD)
  • Received : 2018.03.08
  • Accepted : 2018.05.08
  • Published : 2018.08.20
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Abstract

This paper proposes a three-bridge LLC resonant converter with auxiliary switches for a wide output voltage control range. This converter can be controlled in two ways to achieve a wide controllable output voltage control range of $V_o$ to $3V_o$. The first control mechanism is achieved through the pulse width modulation (PM) of the auxiliary switches and primary switching devices, while the second control mechanism is achieved through the frequency modulation (FM) of the primary switching devices that are configured to operate in the full-bridge switching mode when the auxiliary switches are turned off. The feasibility of using the proposed converter is verified by the results of an experiment with a 2kW prototype.

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References

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