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李山,宋立风,章治国.四开关Buck-Boost变换器的三模式控制方法研究[J].电源学报,2019,17(3):111-119
四开关Buck-Boost变换器的三模式控制方法研究
Study on Three-mode Control Method for Four-switch Buck-Boost Converter
投稿时间:2017-06-08  修订日期:2018-05-08
DOI:10.13234/j.issn.2095-2805.2019.3.111
中文关键词:  Buck-Boost变换器  极限占空比  平均电流控制  宽输入电压范围  平滑切换
英文关键词:Buck-Boost converter  limit duty cycle  average current control  wide input voltage range  smooth switching
基金项目:重庆理工大学研究生创新基金资助项目(YCX2016215)
作者单位E-mail
李山 重庆市能源互联网工程技术研究中心(重庆理工大学), 重庆 400054  
宋立风 重庆市能源互联网工程技术研究中心(重庆理工大学), 重庆 400054 591549148@qq.com 
章治国 重庆市能源互联网工程技术研究中心(重庆理工大学), 重庆 400054  
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中文摘要:
      针对四开关Buck-Boost变换器在两模式运行时,其输入输出电压接近时模式切换频繁以及开关管难以运行在极限占空比下的问题,提出了一种基于平均电流控制的Buck、Buck-Boost、Boost三模式切换策略。该策略在原有Buck、Boost两模式的基础上,通过检测输入电压单元来控制调制信号偏置电压,实现四开关Buck-Boost变换器在Buck、Buck-Boost、Boost三模式下平滑切换,使开关管在宽输入电压范围内工作在有效占空比区间。通过使用平均电流控制来限制电感电流变化,确保变换器的安全可靠运行。最后搭建saber仿真模型和硬件实验平台,验证了所提控制策略的可行性。
英文摘要:
      When a four-switch Buck-Boost converter is under a dual-mode operation, the modes will switch over frequently and the switch tube is difficult to run under the limit duty cycle if the input and output voltages approach each other. To solve this problem, a three-mode switching strategy of Buck, Buck-Boost, and Boost is proposed based on average current control. On the basis of the original dual-mode of Buck and Boost, by adding an input voltage detecting unit to control the bias voltage of modulation signals, this strategy can make sure that the four-switch Buck-Boost converter can smoothly switch over Buck, Buck-Boost, and Boost, and make the switch tube operate in the effective duty cycle range in a wide input voltage range. Average current control is used to restrain the variation of induction current, thus ensuring the safe and reliable operation of the converter. Finally, a saber simulation model and hardware experimental platform was established to verify the validity of the proposed control strategy.
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