一种新颖的升压型电压调整器-两相交错并联耦合电感BOOST变换器

单体蓄电池的使用寿命高于串联使用的蓄电池组,但是单体蓄电池普遍存在电压偏低的问题。针对这一问题选用一种新型的升压电路结构,即两相交错并联耦合电感BOOST变换器,通过改变耦合电感匝比来获得不同的输出电压。在传统两相交错并联BOOST变换器中,当输入输出电压增益较高时,电路的占空比调节范围较小。通过采用耦合电感的方法可以扩展电路的占空比,但由于漏感能量的存在会造成开关管上较大的电压尖峰。该文提出一种在两相交错并联耦合电感结构的变换器中利用相邻相开关管作为钳位管的方法,该方法只需增加一个电容元件即可实现电路的有源钳位功能。理论分析和实验结果均表明该变换器对抑制开关管电压尖峰有很好的效果。

A Novel Step-up VRM-Two-phase Interleaved Coupled-boost Converter

The natural life of battery cell is longer than battery group used in series,but battery cell voltage is so low.As for this problem,this paper introduces a step-up circuit,named two-phase interleaved coupled-Boost converter,and different output voltage can be acquired by changing turns ratio of coupled inductor.Two-phase boost converter operates at a very large duty cycle because voltage gain is high.Using coupled-boost topology can extend duty cycle,but it has a huge voltage spike across MOSFET due to inductor energy.This paper proposes a clamping scheme that the power switches of their own channels serve as the active clamping switches for neighbor channels in a two-phase interleaved coupled-boost converter,and only adding a capacitor can realize active clamping function.Both analysis and experiment have shown that it has good effect for restraining spike voltage in a two-phase coupled-boost converter.