Mix-Voltage Conversion for Single-Inductor Dual-Output Buck Converters

Abstract

A single-inductor dual-output (SIDO) buck converter has recently found applications in hand-held battery-powered electronic devices. The circuit operation and the functional interdependencies among basic converter parameters such as dc voltage gains, transistor duty cycles, and load current levels are much more complicated than those of the single-output counterpart. In this paper, a rigorous analysis was conducted to develop dc equations in steadystate operation for SIDO converters. More importantly, from the analysis results, a possibility of a new mode of operation, dubbed "mix-voltage" operation, will be pointed out. In the so-called "mixvoltage" operation, the converter is capable of working even when the input voltage is lower than one of the two output voltages. In the past, a SIDO buck converter has been used for providing "pure-buck" outputs, i.e., both output voltages are lower than the input voltage. Therefore, this possibility not only opens up new applications but also extends the operating battery range in existing applications. Experimental results confirmed the dc equations and the "mix-voltage" conversion of SIDO buck converters.Index Terms-DC-DC power converters, mix-voltage conversion, single-inductor dual-output (SIDO).

Active disturbance rejection control of single-inductor dual-output buck

“…It is ideal for electronic devices requiring dual power supplies, offering improved efficiency compared to traditional converters [1][2] . However, the shared inductor in the SIDO converter introduces complex interbranch coupling, affecting output voltages when one branch's load changes [3] . As a result, optimizing control strategies to enhance dynamic performance and minimize cross-coupling has become a key research focus for scholars [4][5] .…”

Coupled inductor‐based triple output bi‐polar converter with duty cycle estimation

“…Other articles [15][16][17][18][19][20] have discussed the topologies and control for generation of bi-polar outputs. Le Chae et al and Ma et al 15,16 used a modified comparator control algorithm.…”

“…Ma et al 17 discuss the generation of M positive and N negative outputs which require M + N inductors and 2(M + N) switches. Huang et al 19 propose a new control technique for a bi-polar output converter which increases the cycle duration. Such converters satisfy the power requirements one after another in a cyclic manner.…”