Font Size: a A A

Research On Pure Electric Vehicles On-board Lithium Battery Charger

Posted on:2016-12-04Degree:MasterType:Thesis
Country:ChinaCandidate:X LiuFull Text:PDF
GTID:2272330482987177Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
In order to reduce the exhaust pollution produced by fuel automobile, electric vehicle which uses electrity as the power source is becoming more and more popular. Electric vehicle is gradually replacing the fuel automobile, which is the trend of the future. As an important component of the electric vehicle, the research and development of charging machine have also attracted a lot of attention. A 7.6 kW on-board charger is designed in this paper to charge lithium batteries.Firstly, this paper introduces the overall scheme of the on-board charger, and the structure of preceding stage Boost circuit and backing stage isolated full bridge is chosen as the main circuit.Secondly, this paper introduces the control strategy. For the prceding stage Boost circuit, small signal model of voltage and current loop is set up respectively after analysis of the digital controller based on average current mode PFC, and the controller parameters are calculated. At last, current tracking voltage and pre-stabilize of the output voltage are realized in MATLAB simulation. For backing stage the phase shifting full bridge ZVS-PWM DC/DC converter, this paper introduces the working process of soft switching and the control algorithm of phase shifting.The value range of resonant ductor is obtained by calculation at the same time.Thirdly, the parameters of main circuit are calculated and the devices of the main circuit are selected. The control circuit based on DSP chip TMS320F2812 is designed, incluing voltage, current, temperature sampling circuit, protective circuit, CAN communication circuit and IGBT drive circuit. Control program is developed with CCS3.3 software platform. Considering the heat dissipation problem, this paper calculates the loss and designs the colling system. The experiment shows that the system can work stably for a long time.Finally, a DC/DC prototype is produced and the charge experiments is done.The rationality of the design is verified through the analysis of the experiment waveform. At the same time, the works that have done are summarized and the direction of the farther research is pointed out.
Keywords/Search Tags:electric vehicle, on-board charger, PFC, phase-shift full bridge
PDF Full Text Request
Related items