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【24h】 Second-Order Sliding-Mode Controlled Three-Level Buck DC–DC Converters

机译二阶滑模控制三电平降压DC-DC转换器

【摘要】Three-level buck dc-dc converters have advantages over the traditional buck converters: half switch voltage stress, doubling effective switching frequency, smaller inductor size, and the higher power density. To benefit from those advantages, the flying capacitor voltage must be balanced at half of the input voltage. Most existing methods of balancing the flying capacitor voltage require current sensing, which increases the cost and noise sensitivity. This paper proposes a novel state-machine structure of second-order sliding-mode (SOSM) control for three-level buck dc-dc converters without sensing currents. With insensitivity to parameter variations of SOSM control, the proposed control approach tackles the strongly coupled problem of output voltage and flying capacitor voltage in three-level buck dc-dc converters. Compared to existing approaches, the controller achieves fast start-up without overshoots, fast load disturbances rejection, and robustness against parameter uncertainties for the output voltage, and balance of the flying capacitor voltage without sensing the current of flying capacitor. The proposed approach is verified with experimental results of a 1.25 V, 2.5 A prototype.

【摘要机译】与传统的降压转换器相比,三电平降压dc-dc转换器具有以下优势:开关电压应力减半,有效开关频率加倍,电感尺寸更小,功率密度更高。要受益于这些优势,飞跨电容器电压必须平衡在输入电压的一半。平衡飞跨电容器电压的大多数现有方法都需要电流感测,这会增加成本和噪声灵敏度。本文提出了一种新颖的三阶降压dc-dc转换器的二阶滑模(SOSM)控制状态机结构。由于对SOSM控制的参数变化不敏感,因此所提出的控制方法解决了三级降压dc-dc转换器中输出电压和飞跨电容器电压的强耦合问题。与现有方法相比,该控制器可实现快速启动而不会出现过冲,快速消除负载干扰,并具有针对输出电压的参数不确定性的鲁棒性,并且可在不感测跨接电容器电流的情况下实现跨接电容器电压的平衡。 1.25 V,2.5 A原型的实验结果验证了所提出的方法。

【原文格式】PDF

机译 电压控制;电容器; DC-DC电源转换器;开关;传感器; MOSFET;电感器;
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