Study of the Phase Shift Plus PWM Control Strategy Based on a Resonant Bridge Modular Switched-Capacitor Converter
Study of the Phase Shift Plus PWM Control Strategy Based on a Resonant Bridge Modular Switched-Capacitor Converter
复制标题
基于谐振桥模块化开关电容变换器的移相加PWM控制策略研究
DOI：
10.1109/tii.2017.2725944
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发表时间：
2017-07
影响因子：
12.3
通讯作者：
Cheng Chen
中科院分区：
文献类型：
--
作者：
He Liangzong;Cheng Chen
桥式模块化开关电容变换器（BMSCC）具有对称模块化结构，具有输出电压涟漪小、元器件成本低、电压扩展方便等优点，但输出电压调节能力弱。本文提出了一种移相加脉宽调制（PWM）控制策略的新型谐振BMSCC。该控制方法实现了输出电压的调节和环路峰值电流的限制。通过对不同情况下输出电压涟漪特性的分析，也可以有效地控制输出电压涟漪。详细分析了MOSFET的开关相位与输出电压的关系、MOSFET的开关相位与环路峰值电流的关系。同时，通过优化开关时序，该控制方法保证了几乎所有开关器件都能保持零电流或零电压开关，从而提高了系统效率。利用Saber仿真软件和硬件平台，对软开关特性、输出电压特性和峰值电流特性进行了验证。
Bridge modular switched-capacitor converter (BMSCC) has been reported with symmetric and modular structure, and featured less output voltage ripple, less components cost, and convenient voltage extension but weak output voltage regulation. This paper presents a phase shift plus pulse width modulation (PWM) control strategy for the novel resonant BMSCC. With this control method, output voltage regulation and the limitation of the loop peak current to a proper range are implemented. Also, output voltage ripple could be effectively controlled as well through the voltage ripple characteristics analysis in different cases. Detailed analyses of the relationships between the switching phases of MOSFETs and the output voltage, the switching-phases of MOSFETs and the loop peak current are performed. Meanwhile, through optimal switching sequence, the proposed control method ensures that almost all switching devices maintain zero current switching or zero voltage switching operation, which results in high system efficiency. Using simulation software of the saber and hardware platform, the soft switching, output voltage, and peak current characteristics are verified.
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