| Nowadays,motor vehicles have become an indispensable tool in people's lives,and their popularity has indeed brought great convenience to our work and life.However.energy problems and environmental pollution caused by motor vehicles have also brought adverse effects.The development of new energy vehicles,represented by electric vehicles,has attracted more and more public attention.Therefore,the research on electric vehicle on-board charger can effectively promote the development of electric vehicle charging technology and achieve energy saving and emission reduction in the field of transportation.The positioning of on-board charger is slow charging equipment,which needs power supply on the grid side when charging,and it will have a great impact and influence on the power grid when it is used centrally.In consideration of reducing the burden and harmonic pollution to the power network,the on-board charger needs strict requirements in input current ripple,power factor and so on.At the same time,as a power electronic equipment installed on the vehicle,the on-board charger has strict requirements in EMC,efficiency,output voltage ripple and other aspects as well.On the basis of consulting relevant data,a 3.3kW car-mounted charger is designed in this study.In order to meet the requirements of EMC,PF value and input current ripple,the interleaved parallel BOOST converter is used as the main topology of the PFC correction circuit,and the TI interleaved PFC control chip UCC28070 is used as the main control chip.The full-bridge LLC resonant converter is adopted as the main topology,and the LLC FM control chip NCP1395 of ON Company is adopted as the main control chip with the purpose of meeting the requirements of output efficiency.output ripple and heat.In this study,the principle of the front-stage PFC correction circuit is analyzed and the parameter are calculated,the key elements such as power device,inductance and capacitance are selected,and the control circuit,drive circuit and other peripheral circuits are designed.The working principle of the rear stage DC/DC converter is analyzed,and the FHA model of the full-bridge LLC resonant converter is established.The quality factor O and inductance coefficient k are calculated in detail,the high frequency transformer,power device,inductance,capacitance and other parameters calculated and designed detailedly,and the control circuit,drive circuit,protection circuit and other auxiliary circuits are designed.After all the design of the on-board charger is finished,the designed circuit is simulated by PSPICE 16.6,and the prototype is experimented.Simulation and experimental results verify the feasibility of the design scheme.The on-board charger designed in this study can meet the input current ripple,PF value,power,efficiency and other design indicators. |
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