50KVA Dual Buck Half Bridge Inverter

This paper focused on the research of new pattern ground power supply unit for aeroplanes, and majored in the design of inverter. Based on sufficient acquaintance of the development and current situation of inverter, this paper adopted three phase inverter combined with the dual buck half bridge inverters to get the large power output. This circuit is simple and reliable, and strong capable to afford imbalance loads.At first, this paper analyzed two work modes of the dual buck half bridge inverter in detail, and prepared the academic basement of circuit for the control method and application research. In order to improve the efficiency, the inverter must work at the non-bias current mode. Then this paper analyzed the hysteresis control method of non-bias current mode, analyzed the stable state and external behavior of this control system and the dissipation of mail circuit.The following words gave the components'design process and the main parameters'selected method for the main circuit, which included the certainty of the input direct voltage, the selection of the input and output filter capacitor, the selection and design method of the output filter inductance, and the selection of IGBT and continuous diode. Moreover, it introduced the design of the control circuit, which included the digital actualization of fiducially three phase sine wave, the design of hysteresis control circuit, the design of drive circuit and overcurrent protection, and the design process of assistant power supply.In the end, the simulation of this system with software Saber has proceed, then it gave the solution of issue during the experiment.