一种交错并联DC-DC变换器数字优化控制方法

摘要

Large discharging capacity of super capacitors in EV requires bidirectional DC-DC converter to have a larger current capacity. One single converter is unable to carry excessive current ,and multiple parallel standard module converters can be adopted to increase the current limit. Two phase interleaved half bridge Buck-Boost converter in current mode was taken as an example to present a comprehensive digital control method ,which was improved from the existing current sharing and interleaving method. An experimental prototype based on DSP controller was designed ,and the feasibility of the scheme is proved by the experimental results.%车用超级电容具有大电流放电能力要求,其后端双向DC-DC变换器具有较大的电流容量.单个变换器难以承担过大的电流容量,可采用并联多个标准模块变换器提高电流容量.以工作于电流模式的两相交错并联半桥型Buck-Boost变换器为例,对目前已有的均流、交错方法进行了改进,提出了一种数字控制方法.设计了一台基于DSP控制的实验样机,实验结果证明了所采用方案的可行性.