点火模块用脉冲变压器的关键寄生参数影响分析及优化设计方法

Key Parasitic Parameters Analysis and its Optimization Method of Pulse Transformer For Ignition Module

点火模块是脉冲等离子体推力器(Pulsed Plasma Thruster,PPT)启动放电的基础,而脉冲变压器作为点火模块的核心元件,其输出特性是影响PPT点火工作可靠性的关键因素。本文分析了脉冲变压器各寄生参数对输出脉冲波形的影响,指出脉冲变压器的漏感是影响输出电压上升速度和点火后电压波形振荡的根源,而寄生电容和激磁电感影响相对较小,基本可以忽略。脉冲变压器漏感越小,输出脉冲电压波形整体性能越优越。基于电磁场原理分析了脉冲变压器的漏感形成机理并建立了漏感的理论计算模型,进而提出了环形脉冲变压器的优化设计流程。经过优化设计的变压器相比于传统的脉冲变压器有效减小漏感的大小。最后通过脉冲变压器的单体测试结果验证了理论分析的正确性和可行性。

The ignition module is the basis of the start-up of the Pulsed-Plasma Thruster(PPT),in which the pulse transformer is the core of the ignition module.The output characteristics of the pulse transformer are the key factors affecting the reliability of PPT ignition.This paper discusses the influence of parasitic parameters of Pulse Transformer on output pulse waveform.It is pointed out that leakage inductance of pulse transformer is the root that affects the rise speed and voltage waveform oscillation after ignition of the output voltage,while parasitic capacitance and excitation inductance have relatively little influence and can be ignored basically.The smaller the leakage inductance of the pulse transformer,the better the overall performance of the output pulse voltage waveform.Based on the electromagnetic field principle,the pulse transformer's leakage inductance mechanism is analyzed,and the theoretical calculation model of leakage inductance is established.Furthermore,the pulse transformer optimization guideline is proposed.Compared with the traditional one,the optimized pulse transformer can effectively reduce leakage inductance value.Finally,the test result of the pulse transformer verifies the theoretical analysis to be correct and feasible.