Design Of Electric Vehicle Charging Pile Based On One-cycle Control Bridgeless Converter

Traditional vehicles rely mainly on primary energy as the driving force of the vehicle,which produces serious pollution of the urban environment,air quality is getting worse and worse.At the same time,the consumption of oil resources is increasing due to the rapid growth of the number of traditional vehicles,resulting in pollution will be even worse.only from the source of governance,changing the energy structure,can the environmental problems and the shortage of oil resources be effectively improved.In recent years,as advocated by the low-carbon economy,the new energy electric vehicles have been growing,and gradually become the mainstream direction of the development of the vehicles industry in twenty-first Century.The electric vehicle charging pile is the most important part of the new energy automotive industry chain,so the development of charging pile has become particularly important.The charging pile of electric vehicle is a kind of control device which transforms AC power into stabilized direct current and charges power battery for electric vehicles.In this paper,a two stage electric vehicle charging pile topology based on AC/DC converter and DC/DC converter is designed.Its working principle is to carry on the commutation,the filtration,the active power factor correction to obtain the high quality,the smooth stable DC power,Then the DC/DC converter is used to convert the stable DC power to the high frequency pulsating DC,after high frequency transformer step-down and then rectified and filtered to form a stable DC power to meet the requirements.In order to maximize the utilization of electrical energy,the former stage AC/DC converter is designed using a bridgeless Boost converter instead of a conventional AC/DC converter with a rectifier bridge to eliminate the rectifier bridge losses,at the same time,a new nonlinear control method,namely one-cycle-control,is adopted to improve the power factor of the equipment.The phase shifted full bridge resonant converter based on ZVS-PWM is used to reduce the switching loss and noise interference and improve the efficiency of the device in the step-down link.Through the two stage transformation,the charging performance of the charging pile is improved.In this paper,the Matlab/Simulink simulation tool is used to simulate the bridgeless Boost converter based on one-cycle-control and the phase shifted full bridge resonant converter based on ZVS-PWM.The simulation waveform of APFC proves that the one-cycle-control strategy can effectively improve the power factor correction of the bridge less Boost converter and improve the efficiency of the equipment;The simulation waveforms of the step-down circuit show that the phase shifted full bridge resonant converter based on ZVS-PWM can output the stable DC power that meets the requirements.Thus,the topology of the charging pile based on the one-cycle-control bridgeless converter is verified,which can effectively charge the electric vehicle.