Electric Car The Car Charger Power Module Design And Implementation

Electric vehicles (EV) use clean electric energy and the motor noise is low, so they have a great advantage and development potential. It is becoming an inevitable trend that EV will replace conventional energy vehicles. Large-scale applications and promotion of electric vehicles seems to be rather slow, charging facilities is still not perfect is an important reason. The endurance of electric vehicles is relatively weak, so vigorously accelerate the construction of charging stations is more urgent. The power module in the charger is the main body to realize the electrical energy converting, whose position is very important in the charger.Firstly, this paper describes the structure of the charger system, which is mainly composed by the management module, power module, the charging terminal. It formulates the design parameters of the power module to meet the required functionality and performance requirements under the overall framework of the charger. Power module uses a full-bridge DC-DC topology and the "inner current loop and outer voltage loop"(CC-CV) control strategy, which transforms the three-phase grid power to charging DC current or a DC voltage the batteries required for.Secondly, the paper puts forward the main circuit and control circuit of the power module with a detailed design process. The design of main circuit focus on the design of magnetic devices:high-frequency transformer and high-frequency filter inductor. The control circuit has the control, drive, testing, and self-protection and other features. It designs the software design process at the same time. In the light of the characteristics of the battery, the power module selects of the constant current to constant voltage charging (CC-CV) strategy. Designs the PI compensation network for the inner current loop and voltage loop of the controller respectively.Finally the paper uses the the simulink simulator to simulate the main circuit and control circuit, which verifies the reasonableness of the design of controller compensation network parameters; then builds a experimental platform for the power module to investigate the dynamic response of the power module, and its ripple factor, voltage accuracy and current accuracy and other parameters meets the design goals of the front. Then it completes the battery charging experiments, achieves the function requirements of the charger power module.