Study On Control Strategy Of Single-Inductor Multiple-Output Converters

When using a portable electronic device, people always want the device to work with a longer duration, which device power management put forward higher requirements for portable electronic devices with a variety of different levels of multi-voltage power supply characteristics, single inductor multi-output(SIMO) put forward converter topology used in portable devices makes multi-output power efficiency has been improved. But single-inductor converter operating in continuous current mode between the output branch there is a serious cross-regulation, so that the output voltage is unstable.In this paper, single-inductor dual-output (SIDO) Buck converter for the study, analysis of the working principle and the different modes of operation, the establishment of small-signal converter model, adjusted for cross-existence between the output, analyze the nature of the cause of cross-regulation, too the specific parameters that affect cross-regulation. On this basis, the establishment of a complete closed-loop control system model PCM, but the inductor current existence of different modes result in the presence of the slope compensation current control design problems. This paper presents a non-current loop control to achieve stable single-cycle SIDO-Buck converter output, the establishment of a single week closed-loop control system model. Through simulation and experimental way to verify the one-cycle control SIDO-Buck converter is feasible.