High efficiency buck-boost converter with reduced average inductor current (RAIC) technique

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

doi:10.1109/esscirc.2009.5326019

Cited by 12 publications

(7 citation statements)

References 5 publications

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“…Several mixed-mode operational methods have been proposed in previous literature [1], [2], [8], [9]. The method proposed in [8] causes more switching loss, when the input voltage (V IN ) approaches the output voltage (V OUT ).…”

Section: A Mixed-mode Switching Methods and Proposed Circuitsmentioning

confidence: 99%

“…The method proposed in [8] causes more switching loss, when the input voltage (V IN ) approaches the output voltage (V OUT ). The method in [9] requires some extra comparators/circuits for further dividing the mixed mode into two sub-modes. A dual-ramp control is used in this work [1], [2], and this method can automatically decide to operate in either the buck or boost mode without knowing whether V IN is higher than V OUT or not.…”

Section: A Mixed-mode Switching Methods and Proposed Circuitsmentioning

confidence: 99%

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Analysis and Design of Mixed-Mode Operation for Noninverting Buck–Boost DC–DC Converters

Wei

2015

IEEE Trans. Circuits Syst. II

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A non-inverting buck-boost DC-DC converter can work in buck, boost, or buck-boost mode, but it has been analyzed that operating in the buck-boost mode has the lowest efficiency. However, if the buck-boost mode is excluded, the converter may jump between the buck and boost modes when the input voltage approaches the output voltage. This transition region is called the mixed mode, and larger output voltage ripples are expectable. In this work, the conditions for the converter to operate in the mixed mode are analyzed, including the impact of mismatches between ramp signals, and a ramp generator is designed accordingly. Moreover, a full-cycle current sensing circuit is proposed, and it can effectively inhibit the switching noise on the sensed current signal. The proposed chip was fabricated by a 0.35 μm 2P4M 3.3V/5V mixed-signal polycide process. The maximal measured efficiency is 93.5%.

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Section: A Mixed-mode Switching Methods and Proposed Circuitsmentioning

confidence: 99%

Section: A Mixed-mode Switching Methods and Proposed Circuitsmentioning

confidence: 99%

Analysis and Design of Mixed-Mode Operation for Noninverting Buck–Boost DC–DC Converters

Wei

2015

IEEE Trans. Circuits Syst. II

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“…The average inductor current is close to load current when this proposed converter works in buck-boost mode. However, for conventional four-switch buck-boost converter [3][4][5][6]10], the load current is 1/2 of average inductor current when V IN is approximately to V OUT . Therefore the proposed converter can reduce conduction loss and improve the conversion efficiency in buck-boost mode.…”

Section: System Structure Topology and Various Working Modesmentioning

confidence: 99%

“…A high-efficient reduced average inductor current technique is presented in [4], but the mode detect circuit falls in accuracy problem because both the 10 mΩ switching metal-oxide semiconductor (MOS) resistance and the load current are too small. Besides, buck-boost converters in [1][2][3][5][6][7][8][9][10][11] only focus on the efficiency in transition modes, the condition under light load is not mentioned.…”

Section: Introductionmentioning

confidence: 99%

Low‐quiescent‐current flexible mode buck–boost converter

Cheng

Lai

Shi

2015

IET Power Electronics

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In this study, a mode-flexible buck/boost converter with four operation modes aiming at improving efficiency and extending battery life in portable devices is proposed. When the battery supply decreases or increases, the transition is smooth and the mode can be chosen flexible. High efficiency is obtained because of the introduction of buck-boost mode in pulse-width modulation and the burst mode under light load. The converter can work in an appropriate mode according to the current sensing block, which is suitable for lithium battery and power bank. Whole chip obtains 35 μA low-quiescent current in standby mode and 45 μA low-quiescent current in burst mode. Experimental results show that the peak efficiency is 95% at an output 1 A when the supply voltage is 4.2 V. The peak output ripple is 60 mV in BURST mode and 20 mV in constant current mode.

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“…This leads to a three-state transition mode. This technique has been used in some previous papers [3][4] to enhance the efficiency and achieve smooth mode transition. Similar control method has also been extended to singleinductor multiple-output converters [5].…”

Section: Introductionmentioning

confidence: 99%

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

Mok

2013

2013 IEEE International Symposium on Circuits and Systems (ISCAS2013)

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This paper presents the analysis and design of threestate controlled transition mode for buck-boost converter. By introducing an additional state D 2 to the transition mode, a significant efficiency improvement and output voltage ripple reduction are achieved due to the reduced average inductor current and inductor current ripple. Furthermore, the stability of the converter is enhanced according to the dynamic behavior analysis. A buck-boost converter operating in transition mode has been designed and implemented using AMS 0.35μm CMOS technology. Simulation results demonstrate that over 10% efficiency improvement can be achieved at heavy loading and the converter can be stabilized with a smaller compensation capacitor.I.

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High efficiency buck-boost converter with reduced average inductor current (RAIC) technique

Cited by 12 publications

References 5 publications

Analysis and Design of Mixed-Mode Operation for Noninverting Buck–Boost DC–DC Converters

Analysis and Design of Mixed-Mode Operation for Noninverting Buck–Boost DC–DC Converters

Low‐quiescent‐current flexible mode buck–boost converter

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

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