中文摘要：

在电磁发射技术中，充电电源大功率、高功率密度是其重要的技术要求。充电电源工作在间歇工作状态，暂态热设计是影响电源功率密度的关键技术之一。基于30kW／7kV充电电源，对电源的暂态热设计问题进行了初步研究，力求在保证热可靠性前提下实现电源的小型化；重点分析了充电电源中的主要发热器件，并对其进行了损耗计算，利用瞬态热阻抗对IGBT进行了热设计；研制电源样机对热设计进行了验证，实验表明在1min工作周期的单次运行工况下，样机功率密度达到1．4Mw／m3；提出的暂态工况电源工程化热设计方法，为间歇工况电源的热设计提供了依据。

英文摘要：

The power and volume of capacitor charging power supply is the major requirements of applications of elec- tromagnetic launch. A power supply generally works in intermittent status, so the transient thermal design is a key factor that influences the power density of the power supply. We study transient thermal design based on a 30 kW/7 kV capacitor charging power supply. From the premise of ensuring a power supply＇s thermal reliability, the design targets at minimiz- ing the power supply. Moreover, major heating devices and their loss calculation in the power supply are analyzed specifically and a thermal design of IGBT is carried out based on transient thermal impedance. A prototype of 30 kW/7 kV capacitor charging power supply based on the proposed design is developed, and it has power density of 1.4 MW/m3. The proposed method of transient thermal design provides a basis for designing power supplies working in intermittent operating mode.