Phase sequence interchange scheme for suppressing transient cross regulation on the compensator controlled and non‐compensator controlled single‐inductor dual‐output buck converter

Abstract

Abstract Single input multiple output (SIMO) buck converter is a good solution to enhance the area efficiency of the power management unit. Because the SIMO type buck converter uses only one inductor to buffer the transferred energy for the multiple output ports, it usually suffers from severe transient cross regulation in a continuous conduction mode. Most of the well‐known approaches to suppress the transient cross regulation are either to create the additional free‐wheeling loop or to refine the controller loop. The control logic is usually quite specific which may not apply to the other controller types controller. A phase sequence interchange (PSI) scheme is proposed to mitigate the transient cross regulation without modifying the original control design. Compared to the other techniques, the proposed method can be easily applied, but not limited to the compensator‐based control or the non‐compensator‐based control in the buck converter. This study starts with the illustration of the reason why the PSI can mitigate the transient cross regulation. Detail designs are then presented to implement the proposed scheme on both the compensator type and the non‐compensator type controls. Experimental results show that the suppression of the cross regulation is comparable to the other state of the arts.

Keywords

• compensation
• digital control
• power convertors
• power inductors
• switching convertors