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Optimizing the normalized dead-time and maximum switching frequency of a wide-adjustable-range LLC resonant converter

Beiranvand, R ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1109/TPEL.2010.2068563
  3. Publisher: 2011
  4. Abstract:
  5. LLC resonant converter has been widely used in dcdc converters. In this paper, optimum dead-time and maximum switching frequency of a wide-adjustable-range LLC resonant converter are investigated for realizing the zero voltage switching (ZVS) operation even under the worst-case conditions. Analyses demonstrate that these parameters depend on the converter inductance ratio and ratio of the converter resonant capacitor and the effective capacitance appeared in parallel with the drainsources of the power MOSFETs. The necessary dead time for realizing the ZVS operation can be minimized by choosing the normalized maximum switching frequency, properly. Using the dead-time optimum value, soft switching is achieved for all power devices even under the worst-case conditions. Developed prototype of the converter has been tested under different loads (0-3 A dc) and input voltage conditions (320-370 V dc) to achieve a wide-adjustable-range output voltage (40-165 V dc). This dc-dc converter is used as an ion implanter arc power supply. The calculated optimum dead-time and maximum switching frequency are approximately equal to 184 ns and 205.7 kHz, for realizing the ZVS operation at the worst-case conditions. These parameters in the prototype are approximately equal to 195 ns and 203.5 kHz, respectively
  6. Keywords:
  7. Deadtime ; LLC resonant converter ; switched mode power supply (SMPS) ; zero voltage switching (ZVS) ; DC power transmission ; DC-DC converters ; Electric power supplies to apparatus ; Shape memory effect ; Soft switching ; Switching frequency ; Switching networks ; Time domain analysis ; Zero voltage switching
  8. Source: IEEE Transactions on Power Electronics ; Volume 26, Issue 2 , August , 2011 , Pages 462-472 ; 08858993 (ISSN)
  9. URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5551217