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.
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Zhou et al. (2024) studied this question.
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