Digital Enhanced V$^{2}$-Type Constant On-Time Control Using Inductor Current Ramp Estimation for a Buck Converter With Low-ESR Capacitors

Cheng, Kuang-Yao; Feng, Yu; Lee, F. C.; Mattavelli, Paolo

doi:10.1109/tpel.2012.2206403

Cited by 59 publications

(21 citation statements)

References 19 publications

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“…Power and clockgating may also be used to further reduce quiescent current and enhance light-load efficiency [6][7][11][12]. A popular PFM scheme is the Constant On-Time (COT) controller [6][7][8][9]18], which turns on the regulator's high-side power switch for a constant on-time ( ) once the output voltage drops below a reference level. However, handling a wide range of input, output, and inductor values is quite difficult with such scheme due to the strong dependency of the inductor peak current on these parameters.…”

Section: Introductionmentioning

confidence: 99%

A DCM-Only Buck Regulator With Hysteretic-Assisted Adaptive Minimum-On-Time Control for Low-Power Microcontrollers

Tan

Radhakrishnan

et al. 2016

IEEE Trans. Power Electron.

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A 40mA buck regulator operating in the inherently stable Discontinuous Conduction Mode (DCM) for the entire load range is presented. A Pulse Frequency Modulation (PFM) control scheme is implemented using a proposed Hysteretic-Assisted Adaptive Minimum-On-Time (HA-AMOT) controller to automatically adapt the regulator to a wide range of operating scenarios in terms of input, output, and passive component values while ensuring compensation-less DCM operation with minimized inductor peak current. Thus, compact silicon area, low quiescent current, high efficiency, and robust performance across all possible scenarios can be achieved without any calibration. Moreover, power-gating is employed in the analog circuits of the proposed controller to further improve efficiency at sub-1mA loads. The regulator is integrated within a low-power microcontroller in 90nm CMOS to power its digital core while allowing maximum flexibility in the powering options of the microcontroller and the choice of the passive components. It occupies 0.1mm 2 and achieves 92% peak efficiency, and 78.5% and 86% efficiency at 200µA and 40mA loads respectively. It handles an input in the range of 1.8V-4.2V, an output in the range of 0.9V-1.4V, an inductor in the range of 4.7µH-10µH, and an output capacitor in the range of 2.2µF-10µF without any calibration or re-optimization.

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Section: Introductionmentioning

confidence: 99%

A DCM-Only Buck Regulator With Hysteretic-Assisted Adaptive Minimum-On-Time Control for Low-Power Microcontrollers

Tan

Radhakrishnan

et al. 2016

IEEE Trans. Power Electron.

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“…, where I E and V E are the mean values of the inductor current i L and output voltage V out at steady-state, respectively. Moreover, the minimization of the trace of P , as given in (9), leads to the minimization of the cost function J.…”

Section: Min-type Control Interpretationmentioning

confidence: 99%

“…Moreover, control digital of DC-DC switching converters has been progressively moving in the last years from academic research to industrial applications, this being favored by the rapid development and extended use of high performance digital processors. In this context, the cascade control of a boost converter has also been digitally implemented with both PWM or hysteresis approaches, the inner control loop being based either on current prediction to avoid the continuous sampling of the inductor current [4], [5], [6], [7], [8], [9], [10], [11], [12], [13] or on discrete-time sliding-mode approach [14]. In most cases, the inner loop establishes the transition to OFF state by comparing an index of the increasing inductor current waveform with an upper reference while the transition to ON state is carried out either symmetrically, i.e.…”

Section: Introductionmentioning

confidence: 99%

Min-Type Control Strategy of a DC–DC Synchronous Boost Converter

Sferlazza

Albea-Sánchez

Martínez-Salamero

et al. 2020

IEEE Trans. Ind. Electron.

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This paper presents the analysis and design of a min-type strategy to control a synchronous boost converter in continuous conduction mode. The strategy uses a nonlinear switching surface to establish the change of topology in the converter and is analyzed by means of a sliding-mode control approach. Subsequently, the min-type strategy is modified by a hybrid control formulation, which introduces a hysteresis width and a dwell-time to obtain a finite switching frequency in the start-up and steady-state respectively. The hybrid control formulation is implemented digitally by means of a microprocessor which processes the samples of inductor current and capacitor voltage to provide the control signal that activates the power switch. Experimental results in a prototype validate the proposed control strategy and show its potential in transient time and steady-state. Index Terms-Synchronous boost converter, min-type control, hybrid control, sliding-mode control.

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“…This control scheme does not need error amplifier and complex compensation network, it is easy to realize. The same as constant on-time control [9][10][11], fixed off-time control [12][13] and some other control schemes [14][15][16][17][18] …”

Section: Introductionmentioning

confidence: 99%

Stability analysis and evaluation of ESR for hysteresis controlled buck converter

Wang

Zhao

Dai

et al. 2015

2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia)

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Buck converter using hysteresis controller has been widely used for power supply in industry applications owing to its instantaneous load transient. However the equivalent series resistance (ESR) of output capacitor has a significant effect for the stability performance. In this paper, the critical value of ESR is analyzed and calculated in the hysteresis controlled buck converter. Finally, simulation results indicate that the larger output capacitorESR is necessary to make sure the converter operate normally, otherwise, the converter will operate abnormally.

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Digital Enhanced V$^{2}$-Type Constant On-Time Control Using Inductor Current Ramp Estimation for a Buck Converter With Low-ESR Capacitors

Cited by 59 publications

References 19 publications

A DCM-Only Buck Regulator With Hysteretic-Assisted Adaptive Minimum-On-Time Control for Low-Power Microcontrollers

A DCM-Only Buck Regulator With Hysteretic-Assisted Adaptive Minimum-On-Time Control for Low-Power Microcontrollers

Min-Type Control Strategy of a DC–DC Synchronous Boost Converter

Stability analysis and evaluation of ESR for hysteresis controlled buck converter

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