一种基于耦合电感的单开关高增益低电压应力DC-DC变换器

In this paper, a novel single-switch DC-DC converter based on integrated two boost units and a three-windings coupled inductor with two switched capacitor networks is proposed for high voltage ratio conversion applications. The proposed converter can achieve wide range of voltage gain based on very low voltage stress of all semiconductor devices, and zero current turned-off for all diodes by the reasonable leakage inductance. Moreover, there is a constant potential difference between the ground of its input and output. The above features make the presented converter an excellent interface between the low voltage input source and the high voltage DC-link bus in the field of renewable energy power generation. In addition, the output capacitors in series of the proposed converter are charged and discharged alternately, which can effectively reduce the ripple of the output voltage from the inherent structure. Meanwhile, the inherent circuit structure not only suppresses the voltage spike of the switch, but also absorbs the leakage energy synchronously when the main switch is turned off, improving the efficiency of the converter. The theoretical characteristics of the converter are described in detail, and a 400W experimental prototype is built to prove the effectiveness of the converter.