A Synchronous Multioutput Step-Up/Down DC–DC Converter With Return Current Control

Abstract

This brief presents a new return-current control method for a multioutput step-up/down dc-dc converter. Compared with prior multioutput dc-dc converters, the presently described converter can generate outputs higher or lower than the input voltage with simple control-loop compensation while guaranteeing stability in a wide load range. Using a 0.5-μm bipolar CMOS (BiCMOS) process, a converter having five outputs has been implemented for an LG active-matrix organic light-emitting diode (AM-OLED) display panel. The implemented converter operates at 1-MHz switching frequency with 4.7-μH inductor and 10-μF capacitor. Experimental results show that the proposed control method can generate tightly regulated stepped-up or -down outputs stably under a wide load variation. The conversion efficiency is higher than 80% at a typical AM-OLED panel grey level.Index Terms-Active-matrix organic light-emitting diode (AM-OLED), compensation, current programmed mode (CPM), dc-dc converter, single-inductor-multiple-output (SIMO).

Single-Inductor–Multiple-Output Switching DC–DC Converters

“…Analogous to the SIMO buck case, but unlike an SISO boost converter, the converter can generate some (but not all) outputs below V IN [8], [12], [16] …”

“…Instead of energizing the inductor N times per T SW , converters in [1], [2], [6], [8]- [12], [15], and [16] do so only once, as shown in Fig. 5, but with enough energy to supply all loads.…”

“…Note, however, that at least one output must exceed V IN to induce i L to fall and therefore ensure that L O deenergizes; otherwise, the controller must drain the excess current (preferably back to V IN[12] to save energy).Because inverting buck/boost stages mirror their boost counterparts (in that L O connects to ground as it does to V IN in boost converters), they produce similar but complementary SIMO power trains [Fig. 1(c)][3],[4],[6].While S E similarly energizes L O and S O1 , S O2 , .…”

Non-Isolated Single-Inductor DC/DC Converter With Fully Reconfigurable Structure for Renewable Energy Applications

“…A number of three-port converter (TPC) topologies have been proposed for the benefits of single-stage power conversion between any two ports. The formation of nonisolated TPCs (NITPCs) is based on a generic multiple-input multiple-output structure [1]- [3]. In [4], the authors reviewed and compared recently published non-isolated, partly-isolated and isolated TPCs.…”

Optimization of energy from photovoltaic cell using three port converter for home appliances

“…The TPCs designed for power consuming loads are reviewed in [1]. The control strategies are derived from [4]- [5]. [13] proposes the idea of three-port converter for energy storage in four modes of operation according to the availability of solar energy.MPPT algorithm is proposed in this paper.…”