Isolated solar DC-DC flyback converter design for power supply of critical subsystems

In many applications that produce electrical energy using photovoltaic solar panels, high-value electronic systems are used for critical functions such as managing the system, ensuring security, sustainability, and storing data. This structure, which can be defined as critical subsystems, requires a supply unit that is electrically isolated, stable and continuously operable also, that is low effected as possible as from the fault conditions that may occur in the general system. The aim of this study is to design an isolated, reliable and efficient DC-DC solar based photovoltaic supplier unit capable of operating in a wide range of inputs for the major and expensive subsystems of solar-based photovoltaic applications. This unit is capable of supplying control systems, including micro-controllers or expensive control and storage elements for different purposes, up to 50W instantaneous power level. This design has been designed in conjunction with a highly efficient, isolated flyback converter topology, due to the large work area and the safety of important subsystems. However, the design also includes a boost converter to ensure its energy storage unit and output voltage stability against power failures and faults in solar panels. For this purpose, using a super capacitor and electrolyte capacitor storage elements, a simple and stable storage unit has been designed according to the energy flow in the hierarchical order, which is based on the hybrid capacitor, with the logic of triggering each other. Transformer and flyback converter design according to wide input voltage range has been prepared and harmonized with hybrid capacitor storage unit. A separate voltage regulator is designed and included in the unit to transfer the stored energy to the unit output in a stable and efficient manner. Since the system created in this context is designed in an isolated structure unique to photovoltaic solar based systems, it will take its place in the literature as an uninterruptible power supply model containing its own storage unit for these systems. The designed unit is more advantageous than in the literature works because of its large input area, low cost and less complex structure. The system designed in the context of the study, especially the energy storage unit, can be developed in accordance with different environmental conditions and aims to shed light on future studies.