Designing an instrument for embedded electrical power systems

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Horváth Gyula
Department of Electron Devices

The purpose of this thesis is to design and build a device that is capable of emulating a Li-ion battery cell during the test of a picosatellite’s electronic power subsystem (EPS). The basis of this device is the emulator breadboard which was constructed during my BSc thesis work and the battery parameter measurements, which were made during my MSc project laboratory.

The thesis describes the general architecture of the EPS of a satellite, then goes into detail to cover the structure and operation modes of its subtypes. A planned test layout is presented which uses solar cell and battery emulator instruments in the test of the EPS. Based on the test layout, the block diagram of the device to be designed is presented.

The thesis shows the design steps and operation principles of the two main parts of the emulator device, a galvanically isolated multiple output power supply and the output drive and control board. The operation of the switch mode power supply is verified with measurements. Emphasis is placed on determining the effectiveness of design and construction steps that were made to reduce its output switching noise. The assembled emulator’s discharging, charging and dynamic load behavior is examined. Finally, the direction of future development plans is described.


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