具有磁集成开关电感单元的直流变换器

DC-DC Converter with Integrated Magnetic Switched-inductor Unit

为了提高传统Boost变换器的电压增益、转换效率以及降低开关管的电压应力,在新型Boost变换器中引入了开关电感单元,提高了该变换器的电压增益。由理论分析可得,相比于传统Boost变换器,引入开关电感后的新型Boost变换器的电压增益提高了(2-D)(1+D)/(1-D)倍,同时将开关电感单元与输出电感进行磁集成,不仅可以有效地降低了支路电感的电流纹波,还可以减小变换器磁性器件的物理体积。应用PSIM软件对理论分析进行了仿真验证,并制作了实验样机,证明了理论分析的正确性。

To improve the voltage gain and conversion efficiency of a conventional Boost converter and reduce the voltage stress of switches,a switched-inductor unit is introduced to a novel type of Boost converter,thus improving its voltage gain.Through theoretical analysis,it can be concluded that compared with the conventional Boost converter,the voltage gain of the novel Boost converter after the introduction of switched-inductor is improved by(2-D)(1+D)/(1-D)times.Meanwhile,the switched-inductor unit and the output inductor are magnetically integrated,which can not only reduce the branch inductor current ripple effectively but also reduce the physical volume of the converter's magnetic devices.Simulations were carried out using software PSIM,and an experimental prototype was also made to prove the theoretical analysis.