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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30 kW/7 kV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1 min工作周期的单次运行工况下,样机功率密度达到1.4 MW/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。
In the electromagnetic emission technology, charging power high-power, high power density is its important technical requirements. Charging power supply work in intermittent state, transient thermal design is one of the key technologies affecting power density. Based on the 30 kW / 7 kV charging power supply, the transient thermal design problem of the power supply is studied, and the miniaturization of the power supply is achieved with the guarantee of thermal reliability. The main heating components in the charging power supply are analyzed emphatically, The thermal design of the IGBT was carried out by using the transient thermal impedance. The power prototype was developed to verify the thermal design. The experimental results show that the power density of the prototype reaches 1.4 MW / m3 under the single operation condition of 1 min working cycle. The proposed thermal design method for power engineering in transient conditions provides the basis for thermal design of intermittent power supply.