航天器高电压、大电流柔性线路传输模型建立及分析

Simulation of High Voltage/Current Loading on Flexible Circuits and Its Analysis

在航天器电源模块中,线路的电压值高达300 V,要求线路之间必须具备良好的绝缘性。受到柔性电路制造过程中各因素的影响,线路之间的耐绝缘性能并不可能是理想状态。尤其是线路之间的种子层会加强柔性线路之间的导通能力,使得线路之间树脂绝缘弱化。该文针对高压导电性阳极丝(Conductive Anodic Filamentation,CAF)大电流传输要求,使用COMSOL软件建立了相应高压击穿模型,比较了不同线路之间距离下柔性电路的耐CAF能力。此外,还通过建立有无聚酰亚胺为介质的模型,比较在10 A大电流时的线路损耗情况。同时改变模型中聚酰亚胺的厚度,研究线路周围的温度变化。仿真结果表明,在大电流下线路之间间距为2 mm时,无论线路之间有无种子层,线路之间都具有较好的耐击穿能力,为柔性线路的设计提供了整体方案。

In the aerospace power module,the voltage value of the line is as high as 300 V,which requires good insulation between the lines.The insulation resistance between lines is not likely to be an ideal state due to various factors influenced in the manufacturing process of flexible circuits.In particular,the seed layer between the lines would strengthen the conduction capacity between the flexible lines,thus the resin insulation between the lines is weakened.In this paper,the high-voltage conductive anode filament(CAF)high-current transmission requirements are established,and the corresponding high-voltage breakdown model is established to compare the CAF resistance of flexible circuits at different distances between lines by COMSOL.In addition,a model with or without polyimide as the medium is established to compare the line loss at a high current of 10 A.At the same time,we varied the thickness of polyimide in the model to study the temperature change around the circuit.The simulation results show that the spacing between the lines is 2 mm under high current,regardless of whether there is a seed layer between the lines,the lines have good breakdown resistance,which provides an overall solution for the design of flexible circuits.