Design And Control On Full-bridge DC/DC Converter In Hybrid Electric Vehicle

With the development of science and society, the people’s life quality is improving constantly. At the same time, the consumption of energy gradually becomes the key point of the whole world. The fossil energy supply contradiction is increasingly outstanding. In recent years, consumption of vehicle fuel is the fastest growing part in oil consumption, and it becomes the principle factor of the oil consumption and the development tendency. Adapted the request of epoch, the development of new energy vehicles becomes an important issue among the world’s developed countries, In the field of new energy vehicles, hybrid electric vehicles have important application value. As one of the key technologies of hybrid electric vehicles, DC/DC converter plays an important role. This thesis is to design and control a full bridge DC/DC converter based on MCU, which divides into five parts as follows.Firstly, the background of hybrid electric vehicles is presented. As one of key technologies on HEV, DC/DC converters are introduced in research direction, classification and characteristics.Secondly, the basic working principle of full bridge DC/DC converter is presented in this thesis. Here made a detailed analysis on loss of duty cycle on secondary side and soft switching technology, especially Zero Voltage Switching(ZVS). Thirdly, the DC/DC converter is designed in accordance with requirements. The model of DC/DC converter has been simulated on the open loop mode using Multisim.Fourthly, DC/DC converter control system is presented, including MCU introduction, PID control algorithm and modifying parameter module based on CAN bus.Finally, testing DC/DC converter is to verify the feasibility on full bridge DC/DC converter.