This article proposes the design and implementation of an electrical power system (EPS) for 2U CubeSat using a single-ended primary-inductor converter (SEPIC) along with the perturbed and observe method for the maximum power point tracking (MPPT). SEPIC converters have the advantages of input current continuity, voltage boosting and bucking, short-circuit protection, low-side driver, and noninverted input and output voltages. When the battery voltage is too low, by adding a low power consumption latching relay to develop a novel topology, the battery can be directly charged with solar panels without the MPPT algorithm and to improve the system reliability. In addition to the on-board computer subsystem, we can independently control whether to turn on the power according to the battery capacity and importance priority for each subsystem of CubeSat. The satellite is operated in outer space that the environment is wide temperature variation, vacuum, and high electromagnetic radiation. Therefore, the satellite was subjected to various types of tests, such as vacuum, thermal cycling, and radiation tests, to verify the system's capacity for enduring the aforementioned environmental changes. Finally, implementations and various tests were carried out to verify the viability and the accuracy, and reliability of the EPS of the satellite.

中文翻译：

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2U NutSat高可靠性电力系统的设计与实现

本文提出了一种使用单端初级电感转换器（SEPIC）的2U CubeSat电力系统（EPS）的设计和实现，以及用于最大功率点跟踪（MPPT）的扰动和观测方法。SEPIC转换器具有输入电流连续性，升压和降压，短路保护，低侧驱动器以及同相输入和输出电压的优点。当电池电压过低时，通过添加一个低功耗的闩锁继电器来开发一种新颖的拓扑结构，无需使用MPPT算法即可直接用太阳能电池板为电池充电，从而提高了系统可靠性。除了车载计算机子系统外，我们还可以独立控制是否转向在根据电池容量和CubeSat每个子系统的重要性优先级来确定功率。卫星在环境温度变化大，真空度高和电磁辐射大的太空中运行。因此，对卫星进行了各种类型的测试，例如真空，热循环和辐射测试，以验证系统承受上述环境变化的能力。最后，进行了实施和各种测试，以验证卫星EPS的可行性，准确性和可靠性。