Single-phase Phase-shift Full-bridge Photovoltaic Inverter with Integrated Magnetics

A single-phase phase-shift full-bridge photovoltaic inverter with integrated magnetics is proposed. In the DC/DC stage, the inductor and transformer are integrated into one magnetic core; then the number of magnetic components is reduced, and soft switching is achieved by the integrated magnetics. First, the coupling coefficients expression of integrated magnetics is analyzed; then, based on coupling coefficients expression, the mode analysis is done. Second, a comparison is made of the zero-voltage switching range when different coupling coefficients are adopted. Also, the design of integrated magnetics is analyzed. In the DC/AC stage, an SPWM control is adopted, and the sinusoidal output voltage is achieved. The inverter achieves high efficiency and compact structure. Finally a 100-W prototype inverter is made and the experimental results are given to verify the analysis.