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Digital Hybrid Current Mode Control with Asymmetric Slope Compensation for Three-Level Flying Capacitor Buck Converter

机译:三电平飞电容降压转换器的不对称斜率补偿数字混合电流模式控制

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Due to high effective frequency and reduced voltage stress on the switching devices, the three level flying capacitor (3LFC) buck converter has potential to provide better efficiency and higher power density as compared to the traditional buck converter. However, the control implementation is challenging as a result of flying capacitor instability issue. In this paper, the digital hybrid current mode (HCM) control method which combines the average and peak current mode control techniques is modified and implemented to 3LFC buck converter. Flying capacitor voltage balancing is achieved by adjusting the slope compensation of the two switching pairs asymmetrically. The proposed asymmetric slope compensation technique for digital HCM control method is verified in simulations and experimentally with an ARM-based mixed-signal microcontroller on a 40 V input 13 V / 6 A output prototype.
机译:由于开关设备上的高有效频率和降低的电压应力,与传统的降压转换器相比,三电平飞跨电容器(3LFC)降压转换器具有提供更高效率和更高功率密度的潜力。然而,由于飞跨电容器不稳定性问题,控制实施具有挑战性。本文修改了将平均电流模式和峰值电流模式控制技术相结合的数字混合电流模式(HCM)控制方法,并将其应用于3LFC降压转换器。通过非对称地调整两个开关对的斜率补偿,可以实现快速电容器电压平衡。通过仿真和实验,在40 V输入13 V / 6 A输出原型上,使用基于ARM的混合信号微控制器,对提出的用于数字HCM控制方法的非对称斜率补偿技术进行了验证。

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