Sliding Mode Controlled Sepic Converter for Variable Voltage Applications

It depicts a sliding mode control (SMC) for a single ended primary inductor converter (SEPIC). The objective is to obtain a stable output in a converter with varying loads and varying sources. The functionalities of a buck and a boost regulator are combined in this circuit. The input voltage of a buck converter surpasses the output voltage because it converts a high voltage to a lower value. The SEPIC converter can change the input voltage by altering the duty cycle. The SEPIC is a DC-DC converter with an output voltage that can be less, larger, or equal to the input voltage. The frequency response of the control transistor governs the SEPIC's output. A nonlinear system's dynamics are altered by the SMC. Variable structural control (VSC) is used in the SMC. In contrast to typical SMC methods, the suggested SMC approach employs a sliding surface function. The usage of a sliding surface function simplifies and reduces the cost of implementation. The input current reference is generated using a proportional integral (PI) regulator. This control method allows for rapid, permanent reactions. The goal is to achieve a consistent output from a converter with variable loads and sources. The simulation findings are presented and examined.