Load current‐sensing circuit integrated in high‐frequency PWM/PFM hybrid DC–DC buck converter

Bing, Yuan; Lai, Xiaojun; Liu, Yuxin

doi:10.1049/el.2013.4206

Cited by 13 publications

(7 citation statements)

References 5 publications

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“…V H and V L are defined by Eqs. (11) and (12), respectively. ∆H ys is expressed in (13), emphasizing its dependency on V fb .…”

Section: Current Sensing Circuitmentioning

confidence: 99%

A novel adaptive hysteresis DC-DC buck converter for portable devices

Park¹,

Lee²,

Yu³

2019

Turk J Elec Eng & Comp Sci

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This paper presents a new technique that adjusts the hysteresis window depending on the variations in load current caused by a voltage-mode circuit to reduce the voltage and current ripples. Moreover, a compact current-sensing circuit is used to provide an accurate sensing signal for achieving fast hysteresis window adjustment. In addition, a zero-current detection circuit is also proposed to eliminate the reverse current at light loads. As a result, this technique reduces the voltage ripple below 8.08 mV pp and the current ripple below 93.98 mA pp for a load current of 500 mA.Circuit simulation is performed using 0.18 µ m CMOS process parameters.

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“…V H and V L are defined by Eqs. (11) and (12), respectively. ∆H ys is expressed in (13), emphasizing its dependency on V fb .…”

Section: Current Sensing Circuitmentioning

confidence: 99%

A novel adaptive hysteresis DC-DC buck converter for portable devices

Park¹,

Lee²,

Yu³

2019

Turk J Elec Eng & Comp Sci

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“…From (5), Δv o (nT) is mainly determined by Δi L (nT) in a switching cycle. If Δi L (nT) > 0, v o will rise and vice versa.…”

Section: Low-frequency Oscillation Of Pt-controlled Ccm Boost Convertermentioning

confidence: 99%

“…Boost converters have been popularly used in switching power supply, DC motor feedback system, high step-up ratio DC-DC converter and power factor correction [1,2] due to their advantages of simple topology, continuous input current and excellent steadystate performance. The researches of switching converter control technology started in the 1960s and have made significant contributions to the development of power electronics industry [3][4][5][6][7][8][9][10][11][12][13][14][15]. The traditional classic pulse width modulation (PWM) technology can realise the output voltage regulation by adjusting the conduction time of the switch in a switching period.…”

Section: Introductionmentioning

confidence: 99%

“…[3]. Compared with PWM technology, pulse frequency modulation offers the benefits of good transient performance and high lightload efficiency but the precision of the voltage regulation is poor [4,5]. The switching converter has a good steady state with linear control technology including voltage control, current control, V 2 control and V 2 C control, but it will have a good robustness and dynamic response to the variation of circuit parameters and the input changes or load disturbance with non-linear control technology including charge control, one-cycle control [6][7][8][9].The peak-and valley-voltage controls have simple control circuit and strong anti-interference ability, but the response speed is not up to the mark due to lagging regulation [10].…”

Section: Introductionmentioning

confidence: 99%

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Pulse train‐controlled CCM boost converter with suppression of low‐frequency oscillation

Zhang

et al. 2017

IET Power Electronics

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In the conventional boost converter with pulse train (PT) control, the output voltage will produce undesirable lowfrequency oscillation in continuous conduction mode. To alleviate the problem, this study proposes a novel boost converter in which much more energy can be delivered when the output voltage is less than the reference and vice versa, the energy delivery is suppressed. The response speed of the proposed converter is greatly improved and low-frequency oscillation is reduced. Firstly, the low-frequency oscillation of the PT-controlled conventional boost converter is analysed. Furthermore, the operating principles of the proposed boost converter are studied. Then the processes of start-up and load switching are simulated. The waveforms of the steady-state operation and the transient response of the load change are illustrated through experimental results, which indicate that the novel boost converter outperforms the traditional one in fast response, short startup time, small overshoot, wide load range and effective suppression of low-frequency oscillation.

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“…The light load efficiency can also be improved by optimizing the dead time of power switch and adjustment size of power output device [6]. However, the most popular technology used to improve efficiency is switching the circuit into PFM (Pulse Frequency Modulation) mode when the circuit is working under DCM state by using heavy and light load dual-mode [7,8]. Comparing with PWM mode, PFM shows higher efficiency under light load due to its frequency modulation characteristics.…”

Section: Introductionmentioning

confidence: 99%

A tri-mode high light-load efficiency BUCK converter for mobile phone application

Qing

Lin

2016

IEICE Electron. Express

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This paper proposes a wide output range and tri-mode BUCK circuit which utilizes PWM mode, PFM mode and PSM mode at heavy, light and very light loads respectively. By shutting down the majority of the internal modules, employing minimum loop control and reducing the quiescent current, the design could lower the static power consumption. The work, therefore, could increase efficiency at very light load. The proposed BUCK is fabricated using SMIC 0.18 µm process. Test results show that when the input is 4 V and the output is 1.8 V, the efficiency of the proposed BUCK is 90% and 85% at 300 mA and 5 mA load current respectively.

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Load current‐sensing circuit integrated in high‐frequency PWM/PFM hybrid DC–DC buck converter

Cited by 13 publications

References 5 publications

A novel adaptive hysteresis DC-DC buck converter for portable devices

A novel adaptive hysteresis DC-DC buck converter for portable devices

Pulse train‐controlled CCM boost converter with suppression of low‐frequency oscillation

A tri-mode high light-load efficiency BUCK converter for mobile phone application

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