Design and Evaluation of a Noncoupled Inductor Enhanced Gain Dual Switch SEPIC Converter for PV Application

The small signal stability analysis of a non-coupled inductor, dual switch, and enhanced gain single-ended primary inductor converter (ASIEG SEPIC) is explained in this article. This converter boasts a range of benefits, including non-inverting output voltage, minimized voltage stress on semiconductor devices, high efficiency, and continuous input current. Unlike other non-isolated converters, this one provides improved voltage gain without the need for a clamping circuit. Additionally, there are no voltage spikes during the turn-off process, as no magnetic components such as transformers or coupled inductors are used in the circuit. To ensure the stability of the converter, a small signal analysis was conducted, and a controller was designed for its stable operation. The small signal analysis using state space models has been established to get the appropriate transfer functions essential for the controller design. The converter control system is feasible, as it requires identical gate pulses in both switches. A 100 W, 50 kHz prototype with PV input has been developed to demonstrate the converter's effectiveness. The maximum possible power was harnessed with MPPT from the PV array, and the converter's effectiveness was demonstrated experimentally.