Advanced Control Strategy Of Electric Vehicle Charging And Discharging

With the continuous depletion of fossil resources and environmental problems become increasingly serious,electric cars gradually replace fuel vehicles has become an inevitable trend of future car development.The decisive factors that restrict rapid development of electric vehicles are mainly,mileage short,lack of charging facilities,charging slow.The electric vehicle charging equipment will have characters of high frequency,intelligent control,quick charge in the future.The charging system should be able to simultaneously have a high quality output and fast charging power quality.Advanced control strategies necessary to make the charging system includes a power output of high-quality hardware capabilities,but also a fast charging method.The function of electric vehicle charging system is to transforms alternating current into direct current.Alternating current into direct current mainly includes the process of rectifying,filtering,DC/DC conversion,filtering,DC output.Full bridge circuit in the rectifying process provides a theoretical method to achieve a more efficient frequency conversion and energy utilization.Based on full bridge circuit,the phase shifted soft switching control method provides the control strategy for the high quality power supply of charging system.Improved work with zero-voltage switching and zero-current soft clamp circuit for achieving phase-shifted full-bridge control provides a hardware guarantee.Based on the theory of the Mass law,the intermittent variable current pulse charging method not only takes into account the change rule of the battery charge,but also reduces the gas and polarization phenomenon in the process of charging,and can transfer the most power to the battery in the shortest time.