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Wide adjustable range LLC resonant converter's maximum switching frequency for realizing the ZVS operation

Beiranvand, R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/IRANIANCEE.2010.5506974
  3. Abstract:
  4. In this paper, the FHA and a simple TDA approaches have been used to derive the normalized maximum switching frequency of wide adjustable range LLC resonant converter for realizing the ZVS operation even under the worst-case conditions. By accounting the resonant current higher harmonics, more accurate expressions are derived. These analyses demonstrate that the normalized maximum switching frequency depends on the dead-time and the converter inductance ratio. It also depends on the ratio of the converter resonant capacitor and the effective capacitance appeared in parallel with the power MOSFETs drain-sources. The simulated and experimental results are in good agreement with the derived expressions based on these analyses. Soft switching is achieved for all power devices in inductive region, by choosing the dead-time and maximum switching frequency, properly. Developed prototype of the converter has been tested under different loads (0-3 A dc) and input voltages (320-370 V dc) to achieve an output voltage, adjustable in a wide-range (35-165 V dc), for using as an ion implanter Arc power supply
  5. Keywords:
  6. Component ; Dead-time ; Time-domain analysis (TDA) ; Zero voltage switching (ZVS) ; Arc power ; Deadtime ; Effective capacitance ; First harmonic ; First harmonic approximation (FHA) ; Higher harmonics ; Inductance ratio ; Input voltages ; Ion implanters ; LLC resonant converter ; Output voltages ; Power devices ; Power MOSFETs ; Resonant capacitors ; Capacitance ; DC power transmission ; Electric converters ; Electric power supplies to apparatus ; Electric power systems ; Harmonic analysis ; Soft switching ; Switching frequency ; Time domain analysis ; Zero voltage switching
  7. Source: Proceedings - 2010 18th Iranian Conference on Electrical Engineering, ICEE 2010, 11 May 2010 through 13 May 2010 ; 2010 , Pages 745-752 ; 9781424467600 (ISBN)
  8. URL: http://ieeexplore.ieee.org/document/5506974