Study On Characteristics Of Power Semiconductor For Capacitor-based Pulsed Power Supply

This dissertation is based on pulse power supply (PPS) of electromagnetic launch (EML). PPS is an important component of EML system. Its role is to provide high voltage, high current, high power to EML system. As the development of PPS is high power, modularization, miniaturization, power semiconductor devices are used as switch in PPS. Normal parameters of semiconductor devices are not adapt to working in pulsed surge discharge environment. Its surge technical parameters are very important to used in PPS.The systematic research is about the pulsed surge characteristics of power semiconductor. The main works are as follows:(1)Introduce the basic theory and composition of capacitor-based pulsed power supply. Analyse discharge process of single module and multi-module pulse forming network (PFN).Give the role and the basic characteristics of power semiconductor devices in surgre discharge process.(2)Research discharge characteristics of power diode stack for capacitor-based pulsed power supply. Analysis and comparison of power diode stack are installed different lacation, and they have different discharge characteristics. Theoretically analyse discharge characteristics of the diode, and experimentally study on surge discharge characteristics of the power diode stack at high voltage, high current, surge discharge working environment.(3)Research surge discharge characteristics of power SCR for capacitor-based pulsed power supply. Theoretically analyse discharge characteristics of power SCR in modular pulsed power supply, and experimentally study on surge discharge characteristics of the power SCR stack at high voltage, high current, surge discharge working environment.(4)Research temperature characteristics of power SCR for capacitor-based pulsed power supply. Design experiment to measure the junction temperature of power SCR in the pulsed surge discharge environment. Use specific heat capacity theorety to calculate the junction temperature of power SCR, and compare with experimental data. Study on the security, the reliability and the service life of the power SCR stack in the conditions of surge discharge.Through this dissertation, a study has been made on surge discharge characteristics and temperature characteristics of power semiconductor devices in capacitor-based pulsed power supply, which has a good guidance on the reasonable application, the parameters design and the perforrmance improve of power semiconductor devices.