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buck converter Current Measurement Using Differential Amplifier

Intelligent Automation & Soft Computing 2023年第2期35卷 1387-1402页

作者： P.Rajeswari V.Manikandan Department of Electrical and Electronics Engineering Coimbatore Institute of TechnologyCoimbatore641014India

The accuracy of the measured current is a preeminent parameter for Current Control based Power converter applications to ensure genuine operation of the designed *** current measurement accuracy can be affected by several parameters which includes the type of technology used,components used for the selected technology,aging,usage,operating and environmental *** effect of gain resistors and their manufacturing tolerances on differential ampliﬁer-based buck converter current measurement is investigated in this *** analysis mainly focused on the output voltage variation and its accuracy with respect to the change in gain resistance *** gain resistors with 5%,1%,0.5%and 0.1%manufacturing tolerances taken for the worst-case analysis and the calculated performance results are compared and veriﬁed with the simula-tion *** Operational ampliﬁers(Op-Amp)for high frequency power con-verter applications must operate in a high frequency noise environment and the intended current measuring system must manage common mode noise distur-bances paired with the signal to be *** on the Common Mode Rejec-tion Ratio(CMRR)the common mode voltages and noise signals will effectively getﬁltered *** CMRR results in lower common mode signal rejection,resulting in poor precision and noise *** differential ampliﬁers,the CMRR predominantly depends on gain ***,the variations in Common Mode Rejection Ratio due to gain resistor tolerances also analyzed and compared with the output voltage *** the effects of resistor tolerances,this paper also examines the effect of Op-Amp offset voltage on output accuracy spe-ciﬁcally for low magnitude input *** obtained results from this analysis clearly shows that the gain resistors with 0.1%tolerance gives maximum accuracy with improved CMRR and accuracy at low magnitude input currents will get well improved by using Op-Amps with Low Offset voltage speciﬁcation

关键词： buck converter common mode rejection ratio common mode gain current sensing differential ampliﬁer differential mode gain shunt resistor

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Dynamical analysis and experimental verification of valley current controlled buck converter

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Chinese Physics B 2010年第5期19卷 130-136页

作者：周国华包伯成许建平金艳艳 School of Electrical Engineering Southwest Jiaotong University School of Electrical and Information Engineering Jiangsu Teachers University of Technology

The dynamical behaviours of valley current controlled buck converter are studied by establishing its corresponding discrete iterative map model in this paper. Time-domain waveforms and phase portraits of valley current controlled buck converter are obtained by Runge-Kutta algorithm through a piecewise smooth switching model. The research results indicate that the valley current controlled buck converter exhibits rich nonlinear phenomena, and it has routes to chaos through period-doubling bifurcation and border-collision bifurcation in a wide parameter range. Interesting inverse nonlinear behaviours compared with peak current controlled buck converter are observed in the valley current controlled buck converter. Analysis and simulation results are verified by experimental results.

关键词： buck converter bifurcation dynamical behaviour iterative map

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Dynamics and stabilization of peak current-mode controlled buck converter with constant current load

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Chinese Physics B 2015年第10期24卷 101-109页

作者：冷敏瑞周国华张凯暾李振华 School of Electrical Engineering Southwest Jiaotong University

The discrete iterative map model of peak current-mode controlled buck converter with constant current load（CCL）,containing the output voltage feedback and ramp compensation, is established in this paper. Based on this model the complex dynamics of this converter is investigated by analyzing bifurcation diagrams and the Lyapunov exponent spectrum. The effects of ramp compensation and output voltage feedback on the stability of the converter are investigated. Experimental results verify the simulation and theoretical analysis. The stability boundary and chaos boundary are obtained under the theoretical conditions of period-doubling bifurcation and border collision. It is found that there are four operation regions in the peak current-mode controlled buck converter with CCL due to period-doubling bifurcation and border-collision bifurcation. Research results indicate that ramp compensation can extend the stable operation range and transfer the operating mode, and output voltage feedback can eventually eliminate the coexisting fast-slow scale instability.

关键词： buck converter constant current load discrete iterative map model ramp compensation

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Transfer function modeling and analysis of the open-loop buck converter using the fractional calculus

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Chinese Physics B 2013年第3期22卷 232-239页

作者：王发强马西奎 State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong University

Based on the fact that the real inductor and the real capacitor are fractional order in nature and the fractional calculus,the transfer function modeling and analysis of the open-loop buck converter in a continuous conduction mode（CCM） operation are carried out in this *** fractional order small signal model and the corresponding equivalent circuit of the open-loop buck converter in a CCM operation are *** transfer functions from the input voltage to the output voltage,from the input voltage to the inductor current,from the duty cycle to the output voltage,from the duty cycle to the inductor current,and the output impedance of the open-loop buck converter in CCM operation are derived,and their bode diagrams and step responses are calculated,*** is found that all the derived fractional order transfer functions of the system are influenced by the fractional orders of the inductor and the ***,the realization of the fractional order inductor and the fractional order capacitor is designed,and the corresponding PSIM circuit simulation results of the open-loop buck converter in CCM operation are given to confirm the correctness of the derivations and the theoretical analysis.

关键词： buck converter small signal equivalent circuit model fractional calculus transfer function

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A 1500 mA,10 MHz on-time controlled buck converter with ripple compensation and efficiency optimization

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Journal of Semiconductors 2012年第1期33卷 86-92页

作者： Yu Jiale LüDanzhu Hong Zhiliang State Key Laboratory of ASIC&System Fudan University Shanghai 201203China

A 1500 mA,10 MHz self-adaptive on-time （SOT） controlled buck DC-DC converter is presented. Both a low-cost ripple compensation scheme （RCS） and a self-adaptive on-time generator （SAOTG） are proposed to solve the system stability and frequency variation problem. Meanwhile a self-adaptive power transistor sizing （SAPTS） technique is used to optimize the efficiency especially with a heavy load. The circuit is implemented in a 2P4M 0.35μm CMOS process. A small external inductor of 0.47 μH and a capacitor of 4.7 μF are used to lower the cost of the converter and keep the output ripple to less than 10 mV. The measurement results show that the overshoot of the load transient response is 8 mV @ 200 mA step and the dynamic voltage scaling （DVS） performance is a rise of 16/zs/V and a fall of 20 μs/V. With a SAPTS technique and PFM control, the efficiency is maintained at more than 81% for a load range of 20 to 1500 mA and the peak efficiency reaches 88.43%.

关键词： buck converter high frequency large current load efficiency on-time control

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Analysis of Discharge Spark Energy in buck converter of a Continuous Mode of Inductive Current

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Journal of China University of Mining and Technology 2006年第4期16卷 514-517,522页

作者： CUI Bao-chun CHENG Hong WANG Cong LU Huan-yu SHI Yun Department of Information and Electrical Engineering China University of Mining ＆ Technology Beijing 100083 China

The basic idea of intrinsically safe circuit and the discharge spark in the buck converter in the explosive at- mospheres were introduced. The buck converter is the main topological structure of the switch type of intrinsically safe circuit, which has two working modes: continuous inductive current (CCM — continuous conduction mode) and dis- crete inductance current (DCM — discontinuous conduction mode). The operating state of the continuous inductive current mode is analyzed in detail and the energy of discharge spark in various operating modes is discussed. The total energy will decrease with the increase of switch frequency, in a switching cycle; the discharge spark energy has a maxi- mum and a minimum value. Therefore, the buck converter has smaller discharge spark energy than the linear power circuit and the switch type of intrinsically safe circuit can enhance the output power and the conversion efficiency of the intrinsically safe power.

关键词： buck converter discharge spark intrinsically safe

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buck converter stability techniques for secondary filters and adaptive voltage positioning

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Journal of Southeast University(English Edition) 2021年第3期37卷 258-263页

作者： Yao Suyi Jiang Jianguo School of Electronic Information and Electrical Engineering Shanghai Jiaotong University Shanghai 200240 China

To reduce output voltage noise and improve dynamic response performance,this study designed a buck converter on the basis of secondary filters and adaptive voltage positioning(AVP).A hybrid control method was proposed for the compensation of the secondary *** introduction of a high-frequency feedback path,in addition to the traditional feedback path,effectively improved the influence of the secondary filter on the loop stability and direct current regulation performance.A small-signal model of the buck converter based on the proposed control method was derived,and the stability and selection of control parameters were *** is realized using an easy-to-implement and low-cost control method that was proposed to improve dynamic response performance by changing the low-frequency gain of the control loop and load regulation of the output *** experimental results of the buck converter showed that the proposed method effectively reduced the output voltage noise by 50%and improved the dynamic response capability to meet the target requirements of mainstream electronic systems.

关键词： buck converter secondary filter adaptive voltage positioning(AVP) output voltage noise small-signal model

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Notch filter feedback controlled chaos in buck converter

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Chinese Physics B 2007年第11期16卷 3256-3261页

作者：卢伟国周雒维罗全明 Key Laboratory of High Voltage Engineering and Electrical New Technology of Ministry of Education College of Electrical EngineeringChongqing UniversityChongqing400044China

A method of controlling chaos in the voltage-mode buck converter is presented by using an improved notch filter feedback control in this paper. The proposed control part comprises a notch filter and a low-pass filter. The discrepancy between the outputs of the two filters is introduced into the control prototype of the power converter. In this way, the system period-1 solution is kept unchanged. The harmonic balance method is applied to analysing the variation law of the system bifurcation point, and then the stable range of the feedback gain is ascertained. The results of simulation and experiment are also given finally.

关键词： chaos control of chaos buck converter notch filter

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A high performance adaptive on-time controlled valley-current-mode DC–DC buck converter

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Journal of Semiconductors 2020年第6期41卷 48-55页

作者： Chanrong Jiang Changchun Chai Chenxi Han Yintang Yang School of Microelectronics Xidian UniversityXi’an 710071China

This paper presents an AOT-controlled(adaptive-on-time,AOT)valley-current-mode buck converter for portable *** buck converter with synchronous rectifier not only uses valley-current-mode control but also possesses hybridmode control functions at the same *** to the presence of the zero-current detection circuit,the converter can switch freely between the two operating modes without the need for an external mode selection circuit,which further reduces the design difficulty and chip *** converter for the application of high power efficiency and wide current range is used to generate the voltage of 0.6–3.0 V with a battery source of 3.3–5.0 V,while the load current range is 0.05–2 *** circuit can work in continuous conduction mode with constant frequency in high load current *** addition,a stable output voltage can be obtained with small voltage *** pace with the load current decreases to a critical value,the converter transforms into the discontinuous conduction mode *** the switching period increases,the switching loss decreases,which can significantly improve the conversion *** proposed AOT controlled valley current mode buck converter is integrated with standard 0.18μm process and the simulation results show that the converter provides well-loaded regulations with power efficiency over 95%.When the circuit switches between the two conduction modes drastically,the response time can be controlled within 30μ*** undershoot voltage is controlled within 25 mV under a large current hopping range.

关键词： adaptive on-time buck converter fast response constant frequency high efficiency

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Fuzzy Adaptive Time-Delay Feedback Controlling Chaos in buck converter

Fuzzy Adaptive Time-Delay Feedback Controlling Chaos in Buck...

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第32届中国控制与决策会议

作者： Zicheng Li Yuan Yuan Hou-Neng Wang School of Electrical and Information Engineering Wuhan Institute of Technology Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology

In order to control the chaotic phenomenon of the buck converter,a nonlinear model based on differential equation is established for the buck converter in this *** system phase portrait and bifurcation diagram are analyzed based on the output voltage and input current,then the fuzzy adaptive time-delay feedback control(TDFC) strategy is proposed to control the buck *** strategy is designed for the purpose of calculating the delay time and the range of feedback gain based on quantitative analysis in the frequency domain via the harmonic balance *** adaptively adjusting the parameters of the time delay and feedback gain based on fuzzy adaptive algorithm,the buck converter can work in the period-1 orbit to ensure an ideal output ***,better robustness and smaller voltage ripple for the buck converter are also achieved compared to traditional TDFC control *** simulation results are provided to show the good performance of the proposed strategy.

关键词： buck converter Chaos Fuzzy adaptive Time-delay feedback control

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