Further development of LCL circuitry on board ESEO satellite

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Dr. Szabó József
Department of Broadband Infocommunications and Electromagnetic Theory

In recent years the BME HVT Space Technology Laboratory has produced two satellite power distribution systems. Much of the problems encountered during the development were no longer present in the product, but there were still some that were only managed by the modifications made on the flying models. On the ESEO (European Student Earth Orbiter) the Laboratory was also requested by the ESA to apply a new radiation hardened limiter control integrated circuit. This device can be programmed to various kinds of limiting functions. The problems encountered and the extended functionality of the new device gave the idea to further develop the BME LCL circuit commonly used in the Laboratory.

In my dissertation, I first gave an overview of what protection devices in the satellite power distribution systems are being used. I introduced the commonly used passive and active solutions. Then I approached the presentation of the BME LCL, which was the subject of the thesis. I focused on the motivation of further development and performed the thermal analysis of active operation, which was verified by series of measurements. Based on the results, I designed the modified circuit section and made a recommendation for the "retrigger" function. Based on the designs, I modified the original model and verified the correctness of proposed and calculated modifications.


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