Modeling and Design Considerations of a Novel High-Gain Peak Current Control Scheme to Achieve Adaptive Voltage Positioning (AVP) for DC Power Converters

A constant on-time current-mode (COTCM) control features inherent phase-current balancing, good stability margin and improved light-load efficiency which is a new mandate for many CPU power applications nowadays.For a delicate application such as adaptive voltage positioning (A VP) application, however, the output voltage regulation of a COTCM converter is often inadequate when constant converter output impedance feature is also required.In this paper, a modified converter with a DC-offset correction circuit is presented. A small-signal model is also developed based on describing-function approach which is complicated but necessary to uncover the inherent nature of this control scheme. Experimental results will be shown. A comparison with a ripple-based constant on-time (RBCOT) control scheme will also be given.

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“…This can be seen from (13). However, the low-pass filter bandwidth design should observe the T/ stability criterion to have enough phase margin.…”

Section: Output Impedance Issuementioning

confidence: 98%

“…So, T2 can be used to shape the output impedance frequency response to meet the requirement. From (6), (7) and (9) and Table I , one can see that once the power stage and the low-pass filter parameters are given, the compensation function Gcom can be designed properly [13] [14].…”

Section: Output Impedance Issuementioning

confidence: 99%

A novel constant on-time current-mode control scheme to achieve adaptive voltage positioning for DC power converters

Chen

Cogălniceanu

Lin

et al. 2012

IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society

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“…Figure 19 shows the block diagram of physical and sparse communication network of the system. The consensus algorithm is used to fetch the global information [90] or to integrate with the control schemes [91]. A hierarchical control structure, as shown in Figure 11 used widely to provide a local level operation in the system.…”

Section: ) Distributed Consensus Controlmentioning

confidence: 99%

A Comprehensive Review on Control Techniques for Power Management of Isolated DC Microgrid System Operation

et al. 2021

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The present research investigations in power management fraternity are focused towards the realization of smart microgrid (MG) technologies. Due to intrinsic advantages of Direct Current (DC) system in terms of compatibility with power generation sources, modern loads and storage devices, DC MG has becoming popular over Alternate Current (AC) system. A secondary voltage and current control schemes of DC MG system are mainly based on the distributed consensus control of Multi-agent system (MAS) to balance generation and the demand. The basic concern of the cooperative control of MAS is consensus, which is to design a suitable control law such that the output of all agents can achieve synchronization. The distributed consensus algorithm requires much less computational power and information exchange in between the neighbor's agent. Meanwhile the other controllers such as model predictive control (MPC) requires accurate dynamic models with high computational cost and it suffers from lack of flexibility. The hierarchical consensus control technique is classified into three levels according to their features, namely primary, secondary, and tertiary. MAS is a popular distributed platform to efficiently manage the secondary control level for synchronization and communication among the power converters in autonomous MGs. In this article, various primary control techniques for local voltage control, voltage restoration in the secondary control level and tertiary control for energy management techniques are discussed. With this, the key emphasis to reduce the voltage deviation and disturbances in a heterogeneous DC MG network solutions are discussed. Furthermore, to analyze the system response and the charging and discharging characteristics of the battery unit, the developed second order heterogeneous consensus controller is compared with the traditional homogeneous consensus control and droop control methods. Finally a detailed discussion on simulation case study using heterogeneous consensus control method over the traditional methods are provided using MATLAB/Simulink platform.

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“…To most mobile devices deem that area efficiency is highly important, saving the most capacitors that can use for maintaining operating voltage is the optimal goal. For this reason, several literatures proposed different methodologies to realise AVP [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. In analogue-based AVP design, the value of current sensing parameter (R i ) needs to be determined by the load-line resistor (R LL ), where R LL is defined by the voltage regulation (VR) specification related to the voltage allowable window.…”

Section: Introductionmentioning

confidence: 99%

Power integrated circuit implementation of optimal adaptive voltage positioning scheme using progressive waveform shaping algorithm

Liu

Chang-Chien

2016

IET Power Electronics

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Adaptive voltage positioning (AVP) scheme is widely adopted in the high-load voltage regulation modules (VRMs) because it helps VRMs reducing almost half the number of output capacitors for the same design without using AVP. The AVP scheme is claimed to be optimal if its voltage transient behaviour is linear by tuning the current sensing parameter (R i) to match the value of the output capacitor equivalent series resistor (ESR). In this study, a progressive waveform-shaping method is proposed to automatically achieve optimal AVP for the VRMs without manually setting the optimal R i. Hence, as long as a proper ESR of the output capacitor is determined, VRM designers can use the least output capacitor numbers to obtain the optimal AVP waveform. The proposed method is especially appealing for the power integrated circuit application. The overall controller design was implemented by the Taiwan semiconductor manufacturing company (TSMC) 0.18 μm manufacturing process. In the real implementation, an AVP-based buck converter was devised to perform 5 μs linear transient in response to the 10 A/5 μs load current step at 1.2 V output voltage. Test of the circuit shows that the AVP performance is comparable to those state of the art.

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Modeling and Design Considerations of a Novel High-Gain Peak Current Control Scheme to Achieve Adaptive Voltage Positioning (AVP) for DC Power Converters

Cited by 27 publications

References 19 publications

A novel constant on-time current-mode control scheme to achieve adaptive voltage positioning for DC power converters

A novel constant on-time current-mode control scheme to achieve adaptive voltage positioning for DC power converters

A Comprehensive Review on Control Techniques for Power Management of Isolated DC Microgrid System Operation

Power integrated circuit implementation of optimal adaptive voltage positioning scheme using progressive waveform shaping algorithm

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