Dual-Mode Time-Sharing-Based Buck and Boost Inverter With Reactive Power Injection Capability

Among the numerous single-phase nonisolated single-stage buck and boost inverters (SS-BBIs), dual-mode time-sharing-based SS-BBIs offer significant advantages in terms of high efficiency, buck and boost operation, and low voltage stress. SS-BBIs with the neutral-point clamped structure can suppress leakage current. However, the main drawback of SS-BBIs combining dual-mode time-sharing technology and the neutral-point clamped structure is the inability to inject reactive power and achieve bidirectional energy flow. This article provides a single-phase nonisolated SS-BBI with a multiplexed buck and boost inductor and six insulated gate bipolar transistors (IGBTs) to meet the aforementioned requirements. In this article, the proposed scheme is justified from the perspectives of operating principles, mathematical modeling, design guidelines, control strategy, experimental verification, and comparison analysis. Finally, an experimental prototype with 500 W nominal power is employed in the experimental section to verify performance under the 110~V and 50 Hz AC grid. © 2026 IEEE.