离子电推进系统电源处理单元的数字化设计

Digital design of power processing unit for ion electric propulsion system

为了降低航天器的质量,提高使用寿命,满足商业航天小卫星电推进系统需求,概述了电源处理单元(power processing unit,PPU)数字化设计的需求及屏栅电源设计方案,针对电源处理单元的高精度、高稳定性、快速响应的要求,采用BUCK方案和全桥电路设计屏栅电源。以STM32微控制器为核心设计数字化加热电源和屏栅电源,实现卫星平台/地检设备的数据采集遥测,电源输出电压参数的改变。实验结果表明:三个数字化电源的控制精度均小于3%,数字化控制的电源处理单元具有灵活调整的特点,能够有效减少控制板体积。

In order to reduce the mass of the spacecraft,improve the service life,and meet the needs of commercial aerospace small satellite electric propulsion systems,the digital design requirements of the PPU and the design scheme of the beam power supply were summarized.The BUCK scheme and the full-bridge circuit were adopted to design beam power supply according to the requirements of high precision,high stability,and fast response of the PPU.With STM32 microcontroller as the core,digital heating power supply and beam power supply were designed to realize data acquisition and telemetry of satellite platform/ground detection equipment,and the change of output voltage parameters of power supply.The experimental results show that the control accuracy of the three digital power supplies is less than 3%,and that the digitally controlled PPU has the characteristics of flexible adjustment,which can effectively reduce the volume of the control board.