| With the increasing price of the traditional energy and intensified environmental problems, new energy automobile becomes more and more among large motor corporations. Besides, the rapid development of soft-switching technique, parallel balanced current technology, and electronic devices promotes the development of the high performance and power module power supply. The author researched into and designed a half-bridge topology and high frequency battery charger module on the basis of LLC resonant converter.This paper introduces the working principles of LLC resonant converter in details, mathematically models it with FHA, analyzes its properties of frequency, no-load and short-circuit, and finally provides a full set of parameters designing methods of half-bridge topology LLC resonant converter. Based on this theory, the author designed a battery charger module with the maximum power output of100V/100A. Considering the characteristics of the three phase alternating current, the author adopted the three phase current output of33.3A. After researching into the main power supply circuit of switch and considering the fact that car battery requires a minimum charging efficiency of90percent, however, the hard switching technique could hardly achieve, therefore, the author adopted the soft switching technique to realize the ZVS and ZCS of the module. Each phase main circuit adopts preceding stage PFC, backward stage LLC transformation two-stage topological structure, with paralleled current sharing technology to implement machine modularization power output, and make emulation proof for design main circuit by saber software to accomplish whole circuit design and type selections of the main devices.Finally developed a10kW high frequency charger module with power factor correction, for the single-phase module and the whole machine test, the results show that the overall efficiency of the whole machine is no less than90%, which prove the correctness of theory. |
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