Development On A Phase-Shifted ZVS Full-Bridge Charge With15kW

With the great-leap-forward development of Chinese Railway, the designing and manufacturing technology of CRH has made great progress. Meanwhile with the enhancement of China’s comprehensive national strength and the improvement of people’s living standard, people have higher demand for comfort environment. So higher request for the performance, weight, volume, efficiency, environmental protection and reliability of the auxiliary power supply on CRH5are put forward. Moreover, the combination of full bridge converter and soft-switching technology which used in high-power occasions has resolved the problem. Its research is of great significance.This thesis’ background is the15kW Phase-Shifted ZVS batter charge project being researched by our company. The main technology of a Phase-Shifted ZVS DC-DC Full-Bridge Batter Charge is researched in this thesis. This paper does the careful analysing and discussing about key point selecting of inverter’s main circuit, the design of software and hardware about control part and so on. The main works show below:Firstly, the development of the DC-DC converter is presented. And the article’s background and meaning is discussed. It also introduces the domestic and foreign development present situation and the overall requirements of the project research. Secondly, the theory of the soft-switching technology of PWM DC-DC converter is expounded. The zero voltage soft switch technology which is the suitable topology is selected in this paper, by the careful analyzing with its main circuit topology structure and operation mode analysis. The basic function and theory of batter charge is introduced. And the circuit is designed according to the circuit topology. The calculation and selection of the key components is completed, such as the whole bridge transform power tube, input and output rectifier, high frequency transformers, resonant inductance, voltage current protection. Moreover based on the theoretical calculation, the system is simulated and analyzed by MATLAB. At the same time, it is also proved whether the correctness of all the parts design parameter meet a practical circuit. Finally, this paper introduces composition of ZVS DC/DC charging machine system.. The main circuit and control circuit’s hardware design and the realization of ZVS software are analyzed. Test platform is structured to have a functional test and have a comparision to test result and simulation. Test results from functional testing and the simulation results are compared and analyzed.The experimental work shows that achieving good soft-switching and improving efficiency by this method is right. And the output voltage is controlled stably. So, the higher demand of the auxiliary power supply on CRH is satisfied.