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Using LLC resonant converter for designing wide-range voltage source

Beiranvand, R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/TIE.2010.2052537
  3. Abstract:
  4. LLC resonant converter with significant resonant inductance is proposed for designing an adjustable wide-range regulated voltage source. Large resonant inductance increases output voltage adjustment range and conversion efficiency, particularly at light loads. Soft switching is achieved for all power devices under all operating conditions by choosing the dead time and maximum switching frequency properly and operating in the converter's inductive region. Using a power-factor-correction (PFC) converter reduces the resonant converter's output voltage dependence to the variations of the main ac input voltage. Thus, the compensation of the load variations and the wide-range adjustment of the regulated output voltage can be achieved by using small switching frequency variations. The proposed method has been used to implement an adjustable wide-range voltage source (35165 V dc), as an ion implanter arc power supply. An almost flat efficiency curve with maximum value of 94% has been achieved for the converter. Its output current can change from no load to 3 A dc
  5. Keywords:
  6. Dead time ; LLC resonant converter ; wide adjustable range ; Zero-current switching (ZCS) ; Zero-voltage switching (ZVS) ; Conversion efficiency ; DC power transmission ; Electric power supplies to apparatus ; Inductance ; Soft switching ; Switching frequency ; Zero voltage switching
  7. Source: IEEE Transactions on Industrial Electronics ; Volume 58, Issue 5 , 2011 , Pages 1746-1756 ; 02780046 (ISSN)
  8. URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5484488