High efficiency and smooth transition buck-boost converter for extending battery life in portable devices

Huang, Ping-Ching; Wu, Wen Ching; Ho, Hsin-Hsin; Chen, Ke-Horng

doi:10.1109/ecce.2009.5316448

Cited by 17 publications

(7 citation statements)

References 2 publications

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“…Finding a control scheme for the smooth transition between step-up and step-down operation while preserving high power processing efficiency has been a challenge [8,9]. Multiple control methods [10,11,12,13,14,15] proposed in recent years aim at avoiding the buck-boost mode while reducing the average inductor current and switching losses at the same time. These control methods will be reviewed in Chapter 2.…”

Section: Figure 11: Power Stage Of Conventional Non-inverting Buck-bmentioning

confidence: 99%

“…To address the aforementioned transition problem in non-inverting buck-boost converter, a number of control based solutions have been proposed [10,11,12,13,14,15,21,22,23]. In this chapter, prior state of the art are reviewed.…”

Section: Prior Artmentioning

confidence: 99%

“…The existing literature on smooth transition of NIBB can be classified into serval categories. In [12,13,14,24], a third mode is introduced to eliminate the dead zone. The simplest approach is to operate converter in buck-boost mode with 0.5 duty ratio, with the price of doubling the switching losses and increasing conduction loss as well as inductor volume.…”

Section: Control Based Solutionsmentioning

confidence: 99%

“…However, switching losses are still doubled due to the 4-switch operation. Solutions presented in [12,14] proposed to halve the switching frequency in tri-interval operation. This mode of operation will be explained in more detail in subsection 2.2.1., where inside a buffer region converter operates in tri-interval manner with double switching period, to reduce both conduction and switching losses.…”

Section: Control Based Solutionsmentioning

confidence: 99%

“…The control method proposed in [12,14] is to provide a buffer stage between buck and boost to replace buck boost operation. In the dead zone, where required conversion ratio cannot be reached with just buck or boost mode, due to the limitation of power switches, this control technique combines both buck and boost operation.…”

Section: Tri-interval Operationmentioning

confidence: 99%

See 4 more Smart Citations

Low-frequency ripple-shaping controller for operation of non-inverting buck-boost converters near step-up step-down boundary

Zhang

Radovic

Ahsanuzzaman

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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The work presented in this thesis focuses on the elimination of step-up step-down mode transition problems that occur in low power dc-dc noninverting buck-boost (NIBB) converters, while also significantly improving power processing efficiency compared to existing state-of-the-art solutions. Near the step-down step-up boundary, the introduced controller enters a low-frequency ripple shaping mode of operation that allows lower switching frequency than in conventional buck or boost modes without paying a penalty of increased inductor current ripple, i.e. higher RMS current. As a result, both switching, and conduction losses are reduced. In addition, multi-level non-inverting buck-boost (ML-NIBB) is presented as a potential alternative to the conventional NIBB. Compared to the conventional architecture, the ML-NIBB converter has the potential to reduce the total volume and increase power processing efficiency. An extended version of the ripple-shaping controller is presented and used to preserve the smooth transition between step-down and step-up mode. The effectiveness of the presented ripple-shaping controllers is demonstrated with two 1.8 V to 5 V input, 3.3 V/10 W experimental prototypes, for both NIBB and ML-NIBB topologies.ii

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