Load-Independent Control of Switching DC-DC Converters with Freewheeling Current Feedback

Woo, Young‐Jin; Le, Hanh-Phuc; Cho, Gyu-Ha; Cho, Gyu‐Hyeong; Kim, Seong‐Il

doi:10.1109/isscc.2008.4523249

Cited by 29 publications

(33 citation statements)

References 3 publications

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“…The peak-current , p I which is one of the factors that determines the duty-cycle for each phase, can be controlled by various schemes such as the loaddependent peak-current control [6], the freewheeling current feedback control [4], etc. In order to adopt the load-dependent peak-current control scheme, all output voltages including both the buck and boost output should be sensed by error amplifiers.…”

Section: Peak-current Control Schemementioning

confidence: 99%

“…However, the separate DC-DC converter approaches lead to increase in cost and size due to the required multiple offchip inductors, which is not desirable in portable devices. To circumvent this issue, single-inductor multiple-output (SIMO) DC-DC converters have been proposed, which require only one inductor in regulating multiple output voltages [1][2][3][4][5][6]. With all DC-DC converters, achieving high conversion efficiency is critically important and SIMO DC-DC converters are no exception; furthermore, there are several design issues such as cross regulation, system stability, etc.…”

Section: Introductionmentioning

confidence: 99%

“…With all DC-DC converters, achieving high conversion efficiency is critically important and SIMO DC-DC converters are no exception; furthermore, there are several design issues such as cross regulation, system stability, etc. Addressing these issues, various SIMO DC-DC converters [1][2][3][4][5][6] have been reported, which can be categorized based on the energizing methods. The works reported in [1] and [2], which adopt multiple energizing cycles per switching period, introduced time-multiplexing control and freewheel switching in discontinuous conduction mode (DCM) and pseudo-continuous conduction mode (PCCM), respectively.…”

Section: Introductionmentioning

confidence: 99%

“…They have shown good cross-regulation performances by the adoption of decoupling time among multiple outputs. On the other hand, [3][4][5][6] reported SIMO DC-DC converters that adopt single energizing cycle per switching period, respectively. The former shows greater accuracy characterized by the smaller output voltage ripples and faster control loops than the latter.…”

Section: Introductionmentioning

confidence: 99%

“…The former shows greater accuracy characterized by the smaller output voltage ripples and faster control loops than the latter. [3][4][5] have proposed control schemes, each with its own advantages, However, the applications of the proposed control schemes are limited due to the difficulties in implementing buck and boost outputs simultaneously. In [6], the converter provides both buck and boost outputs simultaneously with smaller number of power switches while adopting hysteresis mode, overcoming the stability problem that arises during unbalanced output loads.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Load-Balance-Independent High Efficiency Single-Inductor Multiple-Output (SIMO) DC-DC Converters

Ko¹,

Jang²,

Han³

et al. 2014

JSTS:Journal of Semiconductor Technology and Science

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Abstract-A single-inductor multiple-output (SIMO) DC-DC converter providing buck and boost outputs with a new switching sequence is presented. In the proposed switching sequence, which does not require any additional blocks, input energy is delivered to outputs continuously by flowing current through the inductor, which leads to high conversion efficiency regardless of the balance between the buck and boost output loads. Furthermore, instead of multiple output loop compensation, only the freewheeling current feedback loop is compensated, which minimizes the number of off-chip components and nullifies the need for the equivalent series resistance (ESR) of the output capacitor for loop compensation. Therefore, power conversion efficiency and output voltage ripples can be improved and minimized, respectively. Implemented in a 0.35-m CMOS, the proposed SIMO DC-DC converter achieves high conversion efficiency regardless of the load balance between the two outputs with maximum efficiency reaching up to 82% under heavy loads.

show abstract

Section: Peak-current Control Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Load-Balance-Independent High Efficiency Single-Inductor Multiple-Output (SIMO) DC-DC Converters

Ko¹,

Jang²,

Han³

et al. 2014

JSTS:Journal of Semiconductor Technology and Science

View full text Add to dashboard Cite

show abstract

Single‐Inductor Multiple‐Output (SIMO) Converter

Chen¹

2016

Power Management Techniques for Integrated Circuit Design

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Sliding-mode control of single input multiple output DC-DC converter

Zhang

Sun

Luo

et al. 2016

Review of Scientific Instruments

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Various voltage levels are required in the vehicle mounted power system. A conventional solution is to utilize an independent multiple output DC-DC converter whose cost is high and control scheme is complicated. In this paper, we design a novel SIMO DC-DC converter with sliding mode controller. The proposed converter can boost the voltage of a low-voltage input power source to a controllable high-voltage DC bus and middle-voltage output terminals, which endow the converter with characteristics of simple structure, low cost, and convenient control. In addition, the sliding mode control (SMC) technique applied in our converter can enhance the performances of a certain SIMO DC-DC converter topology. The high-voltage DC bus can be regarded as the main power source to the high-voltage facility of the vehicle mounted power system, and the middle-voltage output terminals can supply power to the low-voltage equipment on an automobile. In the respect of control algorithm, it is the first time to propose the SMC-PID (Proportion Integration Differentiation) control algorithm, in which the SMC algorithm is utilized and the PID control is attended to the conventional SMC algorithm. The PID control increases the dynamic ability of the SMC algorithm by establishing the corresponding SMC surface and introducing the attached integral of voltage error, which endow the sliding-control system with excellent dynamic performance. At last, we established the MATLAB/SIMULINK simulation model, tested performance of the system, and built the hardware prototype based on Digital Signal Processor (DSP). Results show that the sliding mode control is able to track a required trajectory, which has robustness against the uncertainties and disturbances.

show abstract

Load-Independent Control of Switching DC-DC Converters with Freewheeling Current Feedback

Cited by 29 publications

References 3 publications

Load-Balance-Independent High Efficiency Single-Inductor Multiple-Output (SIMO) DC-DC Converters

Load-Balance-Independent High Efficiency Single-Inductor Multiple-Output (SIMO) DC-DC Converters

Single‐Inductor Multiple‐Output (SIMO) Converter

Sliding-mode control of single input multiple output DC-DC converter

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