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Designing an adjustable wide range regulated current source

Beiranvand, R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/TPEL.2009.2027237
  3. Abstract:
  4. LLC resonant converter has been used widely as dc-dc converter for achieving constant dc voltage. In this paper, an LLC resonant converter, by adding an inductance to its conventional topology and considering the rectifying stage stray inductances, is proposed for an adjustable wide range regulated current source (20-200 A dc) for using as ion implanter's filament power supply. The additional inductor increases output current adjustment range and efficiency, especially at light loads. Transformer's leakage inductances and rectifying stage stray inductances have been considered. Because of these inductances, the rectifier stage always works in continuous conduction mode, and its conduction angle is forced to be larger than π, and peak current of the rectifier stage and the output capacitor have been reduced effectively. Switching losses and electromagnetic interference noises have been reduced as well due to zero-voltage switching at the primary and secondary sides of the converter, and zero-current switching at its secondary side. Soft switching is achieved for all power devices under all operating conditions. A developed prototype of the converter has been tested under different load (2.5-12.5 mΩ) and input voltage conditions (320-370 V dc) with maximum efficiency of 87%. Experimental results confirm high performance of the designed adjustable and regulated current source even under the worst-case conditions
  5. Keywords:
  6. Current source ; LLC resonant converter ; Zero-voltage switching (ZVS) ; Zerocurrent switching (ZCV) ; Conduction angle ; Continuous conduction mode ; Conventional topologies ; Current sources ; DC voltage ; Filament power ; Input voltages ; Ion implanters ; Leakage inductance ; Light loads ; Maximum efficiency ; Operating condition ; Output capacitor ; Output current ; Peak currents ; Power devices ; Rectifier stage ; Secondary-side ; Stray inductances ; Switching loss ; Zero-current switching ; DC power transmission ; DC-DC converters ; Electromagnetic pulse ; Inductance ; Soft switching ; Zero voltage switching ; Electric rectifiers
  7. Source: IEEE Transactions on Power Electronics ; Volume 25, Issue 1 , 2010 , Pages 197-208 ; 08858993 (ISSN)
  8. URL: http://ieeexplore.ieee.org/document/5200524