The pseudocontinuous-conduction mode (PCCM) can be used in the single-inductor multiple-output (SIMO) dc–dc converter to achieve minimized cross-regulation, which will suffer the restrictions of limited load-range and low light-load efficiency. In this article, a capacitor-current dynamic-freewheeling control scheme for PCCM SIMO dc-dc converter is proposed to overcome these restrictions. Taking PCCM single-inductor dual-output (SIDO) buck converter as an example, a complete and accurate small-signal model is established to guide the error amplifier design. Then, the cross-regulation and transient response are explored via impedance transfer functions. With the employment of DF controller, the freewheeling current and the freewheeling period are updated in real-time via load current and capacitor current, which can improve the light-loading efficiency and broaden the load-range. Finally, the effectiveness of the theoretical analysis is verified by experimental results. These results show that the proposed control scheme is more suitable for the PCCM SIDO dc–dc converter to improve efficiency, broaden load range, suppress cross-regulation and enhance transient performance.

中文翻译：

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电容电流动态续流控制 PCCM SIDO 降压转换器的小信号建模和损耗分析

伪连续导通模式（PCCM）可用于单电感多输出（SIMO）dc-dc转换器，以实现最小化交叉调节，但会受到负载范围有限和轻载效率低的限制。本文提出了一种 PCCM SIMO DC-DC 转换器的电容电流动态续流控制方案来克服这些限制。以PCCM单电感双输出（SIDO）降压转换器为例，建立了完整且准确的小信号模型来指导误差放大器设计。然后，通过阻抗传递函数探索交叉调节和瞬态响应。采用DF控制器，通过负载电流和电容电流实时更新续流电流和续流周期，可以提高轻载效率并拓宽负载范围。最后通过实验结果验证了理论分析的有效性。这些结果表明，所提出的控制方案更适合PCCM SIDO dc-dc转换器，以提高效率、拓宽负载范围、抑制交叉调节并增强瞬态性能。