Development of switched capacitor based bidirectional buck-boost converter with fuzzy logic controller

Carbon emissions from fossil fuel-powered automobiles pose substantial risks to both the environment and human health. Due to their lack of carbon emissions, minimal noise, high performance, and efficiency, electric vehicles are highly sought after on a global scale. Different energy storage systems connected to power electronic converters are used to configure electric vehicles. Electric vehicles are often charged by AC-DC converters from charging stations or directly from the grid. The energy needed to accelerate the vehicle is then sent to the engine through energy storage systems. Energy storage devices do offer power, but it is unpredictable and unstable. As a result, any energy source utilized in electric vehicles might need to have a DC-DC converter built into the powertrain's DC bus. These examples demonstrate how crucial it is for the effective operation of electric vehicles that the converter structure between energy storage units and electric motors is functioning. Converters, appropriate controller structures, and modulation methods are needed to enable a secure and dependable power transfer from the energy storage devices to the electric motor. Due to this, a thorough examination of the characteristics, advantages, and disadvantages of DC-DC converters utilized in electric vehicles is provided in this thesis. To identify potential gaps in future working practices, this study also examines the primary issues and difficulties with EV converters and controller structures. It also intends to give suggestions for creating an effective converter structure for use in electric vehicle applications. Finally, a suitable control structure has been developed for a high efficiency and high voltage conversion ratio bi-directional switched capacitor-based (SC) DC-DC converter for usage in electric vehicles. A suitable control structure has been developed. Control is provided via a fuzzy logic controller, which does not necessitate elaborate mathematical procedures and models. The converter also has the benefit of using a synchronous switching signal that can concurrently operate both power switches, reducing the complexity of the control system. High conversion rates at low duty cycles are offered by the suggested converter construction. The voltage stress on the switches is also relatively minimal, and there is just a small voltage ripple at the converter output. Because there are so few magnetic components in the converter structure, the circuit also has a tiny volume and is reasonably priced. The system requirements and the study's objectives were established in the first design phase. Under various input voltages and variable load conditions, the planned bidirectional DC-DC converter is simulated using the Matlab/SIMULINK package program for both buck and boost modes. Due to its ability to maintain a constant output voltage in both directions while operating under a variety of input voltages and load situations, the developed bidirectional DC-DC converter possesses the qualities of a well-designed DC-DC converter. Mathematical analyzes, simulation results and prototype converter circuit made in laboratory environment prove this situation.