面向电辅助制造的大电流脉冲电源建模与设计

Electro-thermal Modeling and Design of High-current Pulse Power Supply for Electrically Assisted Manufacturing

电辅助制造(EAM)是一种前景广阔且发展迅速的金属加工方法。低压大电流脉冲电源是EAM中的关键子系统之一,需要进行合理设计以应对EAM场景下器件瞬态温度变化大的情况。提出了一种基于器件级电热建模的低压大电流脉冲电源的模型设计方法。首先,通过器件级有限元仿真得到了关键部件的热应力,并提出了一种简化的热建模方法,以减轻有限元模拟的计算负担,得到脉冲电流作用下的动态热剖面。其次,基于热模型,研究了电流脉冲持续时间对MOSFET最高温度和温度变化的影响。最后,以10 V/500 A脉冲电源为例进行了理论分析和验证。研究结果有助于EAM应用中脉冲电源的优化设计。

Electrically assisted manufacturing(EAM)is a promising and rapidly developing metal processing method.The power supply is a key sub-system for EAM,which needs to be designed properly.the model-based design of a low-voltage high-current pulse power supply used for EAM was proposed based on converter-level electro-thermal modeling.The thermal stress of key components was obtained by converter-level finite element simulations.A simplified thermal modeling method was proposed to reduce the computation burden of the finite element modeling(FEM)simulation to obtain the dynamic thermal profile under pulse current operation.The impact of the duration of the current pulse on the maximum temperature and temperature variations of MOSFETs was investigated based on the thermal model.A case study of a 10 V/500 A pulse power supply was presented to demonstrate the theoretical analyses and verification.The outcomes contribute to the design optimization and virtual prototyping of pulse power supplies for EAM applications.