低压大电流DC-DC变换器原理分析

Principle analysis of low-voltage high current DC-DC converter

主要介绍的是应用于电池放电中的低压大电流DC-DC变换器。首先,就其工作原理做了详细的分析说明,在此基础上,进行了仿真和实验,并对结果进行了分析。可以得出本拓扑适合应用在低压大电流的结构中。与之前广泛应用的能量从半桥侧传递到倍流侧不同,其重点在于将倍流拓扑当作双Boost拓扑进行放电,即能量从倍流侧传递到半桥侧,可实现输入输出电压相差倍数大,而且最大限度地提高了放电的效率。

A low-voltage and high current DC-DC convertor applied to battery discharge was introduced. Firstly, the work elements of the convertor were analyzed in detail, on the basic of it, a lot of simulations and experiments were carried out, and the result was analyzed at last. The analyzing results show that this topology is appropriate to be used at low-voltage and high current construction. Most of the previous papers introduced the construction which the energy passed from the half-bridge side to double current side; on contrast, in this paper the double current topology as double boost topology was discharge. In another word, the energy passed from double current side to half-bridge side, which could realize that the input voltage differed greatly with the output voltage, and improved the discharge efficiency in maximum limit.