Abstract:
This paper proposes a variable-turns-ratio high-frequency link inverter to easily achieve multi-level outputs for isolated single-stage high-frequency link inverters. To improve current quality, dynamically adjust transformer turns ratio to get five-level (±2, ±1, and 0) outputs. Compared to the two-level high-frequency link inverter, the structure uses a single transformer and a few auxiliary devices. The added circuit operates at low frequency and refines power density. This technique is used to analyze the single-stage active clamped forward grid-connected inverter with variable turns ratio and design a 1000-W prototype to test output performance. Simulations and prototype tests show that the single-stage variable-turns-ratio high-frequency link grid-connected inverter is feasible.
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