大功率霍尔推力器应用的滤波单元建模分析

放电电流低频振荡的抑制是霍尔推力器应用的主要问题之一，使用RLC滤波单元是抑制霍尔推力器放电电流低频振荡的最常用方法.对于大功率霍尔推力器而言，传统的RLC滤波器存在直流功耗大、发热严重的问题.提出并设计了一种新型耦合电感结构的滤波器，相比于传统的RLC滤波器，耦合电感结构的滤波器通过合理的参数设置存在明显的陷波特性，具有更好地抑制低频振荡的效果.对建立的电路模型进行仿真分析，得到了不同耦合电感参数的选择对低频振荡频率信号的衰减作用以及陷波频率的影响因素.结果表明：耦合电感结构的滤波器可有效降低电感值，从而降低滤波器的功耗和发热量，在理论上具有陷波特性的耦合电感结构滤波器对低频振荡具有较好的抑制特性，可以有效降低放电电流低频振荡对电源系统的干扰，具有显著的工程应用价值.

Modeling and Analysis of Filtering Unit for High Power Hall Thruster

Low frequency oscillation is one of the most important problems of Hall thrusters. The use of RLC filter unit is one of the most common method to reduce the discharge current low frequency oscillations. For high power Hall thrusters, the problems of high direct current power consumption and serious heat generation exist in RLC filter. This paper proposes and describes a novel filter with coupled inductor. The filter with the coupled inductor structure has obvious notch characteristics through reasonable parameter settings, and has the effect of better suppressing low frequency oscillation. The circuit model is simulated, and the attenuation effects of different parameters on the low frequency oscillation frequency signal and the influencing factors of notch frequency are obtained. The results show that the filter with coupled inductance structure can effectively reduce the inductance value, thereby reduce the power consumption and heat generation of the filter. In theory, the coupled inductance structure filter with notch characteristics has better suppression characteristics for low frequency oscillation. It can effectively reduce the interference of the low frequency oscillation of the discharge current to the power supply system, and has significant engineering application value.