Buck-Boost DC-AC converter based on coupled inductors.

Area of Science:

• Electrical Engineering
• Power Electronics
• Renewable Energy Systems

Background:

• DC-AC conversion is crucial for integrating renewable energy sources and powering electric vehicles.
• Traditional converters often face challenges with efficiency, size, and cost for high-gain applications.

Purpose of the Study:

• To introduce a single-stage buck-boost DC-AC converter utilizing coupled inductors.
• To demonstrate its suitability for renewable energy and electric vehicle applications.
• To achieve high voltage gain with a reduced component count.

Main Methods:

• A novel converter topology employing three semiconductor switches, two diodes, and three coupled inductors.
• Sinusoidal Pulse Width Modulation (SPWM) for controlling the main switch.
• Validation through MATLAB/SIMULINK simulations and experimental setup.

Main Results:

• Achieved a high voltage gain of up to five times the input voltage.
• Demonstrated a compact size and reduced component count compared to conventional designs.
• Showcased improved converter efficiency and reduced switching losses.
• Exhibited good agreement between simulated and experimental results.

Conclusions:

• The proposed coupled-inductor-based buck-boost DC-AC converter is a viable solution for high-gain applications.
• The topology offers significant advantages in terms of size, cost, and efficiency.
• Experimental validation confirms the reliability and performance of the proposed converter design.