Fully Soft Switched Coupled Inductor-Based Semi Dual Active Half Bridge Converter with Voltage Match Control

This article proposes a fully soft-switched coupled-inductor-based semi dual-active half-bridge (SDAHB) converter designed for wide voltage range and low power applications. The converter employs a negatively coupled inductor to link a boost-type half-bridge with a semi half-bridge, utilizing a single magnetic component. This approach addresses the issue of low power density often caused by multiple magnetic components, such as leakage inductor and transformer. Additionally, the proposed SDAHB converter includes only three active switches, making it cost-effective. To simplify control implementation, the converter operates under a voltage-matching condition using pulse width modulation plus phase shift (PPS) modulation. This also ensures full-range zero-voltage switching (ZVS) for all switches and zero-current switching (ZCS) for the diode. Finally, an experimental prototype is constructed, and the results confirm the validity of the theoretical analysis and design approach.