Analysis and design of three-state controlled transition mode for a buck-boost converter with efficiency and stability enhancement

Hu, Xiaohao; Mok, Philip K. T.

doi:10.1109/iscas.2013.6571942

Cited by 4 publications

(4 citation statements)

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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%

“…In order to decrease the conduction losses, tri-interval operation is introduced in [13]. D buck and D boost are individually specified to determine the conversion ratio.…”

Section: Control Based Solutionsmentioning

confidence: 99%

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

confidence: 99%

Section: Prior Artmentioning

confidence: 99%

Section: Control Based Solutionsmentioning

confidence: 99%

“…In order to decrease the conduction losses, tri-interval operation is introduced in [13]. D buck and D boost are individually specified to determine the conversion ratio.…”

Section: Control Based Solutionsmentioning

confidence: 99%

See 2 more Smart Citations