具有开关电感单元的电感磁集成Buck变换器

为了提高传统Buck变换器的降压能力、降低二极管电压应力及减小变换器损耗,将开关电感应用传统Buck变换器中,提出了一种具有开关电感的电感集成Buck变换器。利用开关电感替代传统Buck变换器中的储能电感,并对开关电感进行了耦合集成。分析了变换器的工作模态,推导得到了变换器电压增益表达式,研究了电感串联等效电阻对变换器电压增益影响,并分析了二极管电压应力与电感电流纹波的大小。与传统Buck变换器相比,具有开关电感的电感集成Buck变换器的电压增益、二极管电压应力和电感电流纹波都减小到传统的1/(2-D)倍。样机实验结果验证了理论分析的正确性,表明具有开关电感的电感集成Buck变换器具有优良的综合性能。

Inductive Integrated Buck Converter with Switched-inductor Units

To improve the step-down ability of the traditional Buck converter, reduce the voltage stress of diodes, and lower the loss of the converter, switched-inductors are applied to the traditional Buck converter, and an inductive integrated Buck converter with switched-inductors is presented. First, the switched-inductors are used to replace the storage inductors used in the traditional Buck converter, and they are further coupled/integrated. Second, the working mode of the converter is analyzed, and its voltage gain expression is obtained; moreover, the effect of the equivalent series resistance of inductors on the converter''s voltage gain is studied. Third, the magnitudes of the voltage stress of diodes and the inductor current ripple are analyzed. Compared with the traditional Buck converter, the voltage gain, diode voltage stress, and inductor current ripple of the novel converter are all reduced to 1/(2-D) times. Finally, the experimental results of a prototype verified the correctness of the theoretical analysis, showing that the inductive integrated Buck converter with switched-inductors had excellent comprehensive performance.