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| Short-Circuit Current Control Strategy for Full-Bridge LLC Converter (I)—Theoretical Analysis |
| Liu Shuo, Zhang Fanghua, Ren Ren |
| Jiangsu Key Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics and Astronautics Nanjing 210016 China |
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Abstract The short circuit problem is a difficult issue in research on LLC converter. This paper derives the trajectory of the full-bridge LLC converter based on state-plane analysis and the characte- ristics of the trajectory performance is provided in short circuit mode. Two types of control strategy for power switches, respectively based on phase-shift frequency-boost or frequency-drop scheme, are deduced for full-bridge LLC converter under short circuit mode. By designing the trajectory of the state variables, two schemes achieve controllable short current output while maintain the advantage of ZVS. Comparing with traditional solution directly increasing switching frequency, the concept presented in this paper brings better short current limitation performance.
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Received: 22 July 2013
Published: 29 June 2015
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2015, Vol. 30 
