| With the rapid development of new energy,charging modules capable of achieving bidirectional flow of power have been more and more widely applied in new energy and other fields.LLC resonant converter has obvious advantages due to its good soft switching characteristics.Aiming at the charge and discharge part of bidirectional DC/DC,a kind of interlaced parallel bidirectional CLLC resonant converter composed of Type-W and Type-Y asymmetric resonant slots is studied and designed.First,steady state model is established,the effects of resonant parameters on DC gain characteristics and resonant cavity input impedance characteristics are analyzed,and the MOSFET work failure analysis and realizing ZVS soft switch condition is got,analysing the resonant component parameter change on the converter load flow characteristics and the influence of uneven flow for each phase of the problem,putting forward the magnetic integration technology is introduced into the converter,using two phase flow scheme of resonant inductance magnetic integration,giving the method of choosing coupling coefficient and coupling inductance of the design process.A cylindrical coupled inductor structure is designed.Then,a numerical calculation and simulation method is used to design the resonant parameters,and the switching device is designed and selected,which can meet the ZVS and ZCS conditions of the switching tube and improve the converter efficiency.Finally,the experimental system is built and the hardware circuit is designed.Using Saber simulation and experiments verify the correctness and effectiveness of the parameter design and magnetic integration scheme,and the converter can achieve high efficiency in the full load range.There are 67 figures,9 tables and 51 references in this thesis. |
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