单周期控制Buck变换器输入电压调整率改善策略

在阶跃输入电压的作用下,单周期控制的Buck变换器的输出电压会产生一定的偏差,无法实现理论上对输入电压扰动的完全抑制。深入分析后发现是由于单周期控制器的硬件延迟所致。在此基础上提出了一种改进型的控制策略,并给出了理论推导和仿真验证。相比于传统策略,该策略在控制环路中增加了积分器输入电压发生环节和参考电压发生环节,可以基本实现对输入扰动的完全抑制,有效地提高了单周期控制Buck变换器的输入电压调整率。

Line Regulation Improvement Strategy for One-cycle Controlled Buck Converters

It is found that one-cycle controlled Buck converter cannot completely eliminate line noise; instead, the output voltage has variable error when the input voltage varies. The reason of this problem was the hardware delay of its one-cycle controller, and then an improved control strategy was proposed. Theoretic derivation and simulation verification was given. Compared with traditional strategy, it can eliminate line noise by adding an input voltage generator of regulator and a reference voltage generator in the control loop.