Direct Trans-Inverse Ladder Inverter for Consumer Electronics

Abstract

This paper presents a novel magnetic coupling inverter with a ladder switched-capacitor technique designed for home appliance. The inverter offers an elevated voltage gain while maintaining a minimal shoot-through duty ratio and achieving a notably high modulation index. As a result, the inverter produces substantial output voltage while placing minimal stress on switches, and improving the quality of the generated output voltage. Moreover, the proposed inverter employs trans-inverse magnetically coupled inductors, achieving high output voltage through a decreased turns ratio. This characteristic eliminates the necessity for a substantial number of winding turns or the extension of extra switched capacitors arranged in the ladder configuration. The proposed converter is modular, enhancing its flexibility and scalability. In contrast to existing magnetized ladder topologies, the proposed converter provides a direct DC-AC conversion without requiring an extra power switch on its DC side, which brings some advantages like simplicity, reduced losses, ease of control, modularity, cost and size effectiveness. Finally, a prototype with a power rating of 550 W suitable for 110 V, 60 Hz households has undergone testing to demonstrate the inverter’s performance.