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Voltage-mode variable frequency control for single-inductor dual-output buck converter with fast transient response

机译:具有快速瞬态响应的单电感双输出降压转换器的电压模式可变频率控制

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摘要

This paper proposes a new control strategy technique called voltage-mode variable frequency (VMVF) control for single-inductor dual-output (SIDO) switching converter to achieve fast transient response and small output cross-regulation. A SIDO buck converter operating in continuous conduction mode (CCM) is taken as an example to analyse the operation modals with different equivalent series resistances (ESRs) of the output capacitor. It indicates that different ESRs can cause inductor current operating in three-step trend or four-step trend, and the critical ESR is derived. Finally, the time-domain simulation model of VMVF controlled CCM SIDO buck converter is established, and the transient performance and output cross-regulation are analyzed. It is found that, comparing to traditional common-mode voltage and differential-mode voltage control, VMVF control has improved transient response and reduced output cross-regulation. Furthermore, this control technique can work stably with different ESRs and even zero ESR.
机译:本文提出了一种新的控制策略技术,称为单模双输出(SIDO)开关转换器电压模式可变频率(VMVF)控制,以实现快速的瞬态响应和小的输出交叉调节。以在连续导通模式(CCM)下工作的SIDO降压转换器为例,分析输出电容器的不同等效串联电阻(ESR)的工作模式。这表明不同的ESR可能导致电感器电流以三步趋势或四步趋势运行,并得出了临界ESR。最后,建立了VMVF控制的CCM SIDO降压转换器的时域仿真模型,并分析了瞬态性能和输出交叉调节。结果发现,与传统的共模电压和差模电压控制相比,VMVF控制具有改善的瞬态响应和减少的输出交叉调节。此外,此控制技术可以稳定地与不同的ESR甚至零ESR一起工作。

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