具有LCL单元的磁集成Boost变换器

Magnetic Integrated Boost Converter with LCL Unit

提出一种由2个电感、一个电容和2个二极管组成的LCL单元,利用该单元的储能作用,提高升压变换器的电压增益。应用磁集成技术对电感进行耦合集成,降低电感电流纹波。为进一步增加电压增益、减小开关管的电压应力引入电容C_(2)。分析了变换器的工作原理,推导了电压增益公式、开关器件的电压应力和电感电流纹波。与传统Boost变换器相比,所提变换器电压增益是其3-D倍,电感电流纹波减小近一半,开关器件的电压应力是输出电压的2/(3-D)。最后通过仿真和实验验证了理论分析的正确性。

An LCL unit consisting of two inductors,one capacitor and two diodes is presented,so that the voltage gain of the traditional Boost converter can be improved owing to the energy storage function of this unit.The inductors are coupling integrated by using the magnetic integration technology,thereby reducing the inductor current ripple.By introducing a capacitor C_(2),the voltage gain can be further improved while reducing the voltage stress of the switching tube.The working principle of the novel converter is analyzed,and the expressions of voltage gain,voltage stress of switching devices,and inductor current ripple are derived.Compared with the traditional Boost converter,the voltage gain of the proposed converter is 3-D times higher,and the inductor current ripple is reduced by nearly 50%.In addition,the voltage stress of switching devices is 2/(3-D)of the output voltage.Finally,the simulation and experimental results verified the theoretical analysis.