Research On DC Transformer Based On V2G Wireless Charging System

New energy electric vehicles have developed rapidly in recent years.The primary decoupling of transformers in the wireless charging technology of electric vehicles has been a major factor limiting the development of wireless charging technology in electric vehicles.However,with the development of technology,the efficiency of wireless charging of electric vehicles has become significant.Improve and have begun to apply to the market.Vehicle-to-grid(V2G)wireless charging technology can use vehicle-mounted power batteries to interact with the grid through isolated bidirectional converters.When the grid power supply cannot meet the load demand,the vehicle-mounted power battery can be distributed.The power supply performs peak shaving on the grid.When the grid energy supply is greater than the load demand,the on-board battery can be used as a load to absorb the remaining energy of the grid.Therefore,the transmission efficiency of the isolated transformer is improved and the control method of its energy transmission is studied for the development of electric vehicles and power grids.Has an important role.In this paper,the transformer compensation structure and transmission power control methods from two aspects of the transformer,solve the transformer low transmission power and transmission power control problems,the specific work is as follows:(1)The working principle of the two-way DC transformer analysis,the establishment of transformer mathematical model,obtained in the transformer LC series,LC parallel,LCL series and parallel in three The relationship between the coupling coefficient and transmission power under the compensation mode;the LCL series-parallel compensation mode has high input impedance and high power factor compared with the LC parallel compensation mode;then analyzes the power control method of the transformer,adopts double-phase-shifted control and monitors the transformer once Mutual inductance between the side and the secondary side of the transformer power transmission direction and size control.(2)The parameters of the transformer compensation circuit,the turn ratio of the transformer,the number of windings of the transformer,the type of the magnetic core and the diameter of the winding are designed.The DSP that generates the control signal of the transformer is selected and the drive circuit and the protection circuit of the switch are designed.Software design includes system program initialization,A/D sampling program,interrupt service routine.Simulation and experimental results show that the voltage oscillation of LCL series-parallel compensation circuit is reduced and the current waveform is sinusoidal.The stress on the components in the circuit is small.The power transmission direction and size of the transformer are controllable,and the transmission efficiency is 88.5%.