A novel control method for multiphase voltage regulators

Lee, K.; Yoa, K.; Zhang, X.; Qiu, Yang; Lee, F.C.

doi:10.1109/apec.2003.1179296

Cited by 24 publications

(6 citation statements)

References 2 publications

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“…The early models proposed in [15][16] [17] [33] directly extends Dr. Ridley's sample and hold concept [60] of peak current mode control to constant frequency V 2 peak control, without any justification. Generally speaking, extension of sample and hold concept is not applicable for V 2 implementation, since this concept is from constant-frequency current mode control, which just consider the sideband information of the current loop and does not consider the influence of the capacitor voltage ripple.…”

mentioning

confidence: 99%

“…Generally speaking, extension of sample and hold concept is not applicable for V 2 implementation, since this concept is from constant-frequency current mode control, which just consider the sideband information of the current loop and does not consider the influence of the capacitor voltage ripple. This is why the models used in [15] [16] [17] [33] cannot accurately predict the influence from the capacitor voltage ripple in constant frequency V 2 peak control.…”

mentioning

confidence: 99%

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Unified Equivalent Circuit Model and Optimal Design of <inline-formula><tex-math>$V^{2}$</tex-math> </inline-formula> Controlled Buck Converters

Tian

Lee

et al. 2016

IEEE Trans. Power Electron.

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V 2 control has advantages of simple implementation and fast transient response and is widely used in industry for Point-of-Load applications. This control scheme is elegant when output capacitors with large RC time constant are employed, such as OSCON capacitors. However, in most cases using capacitors with small RC time constant, such as ceramic capacitors, instability problem will occur. Previous modeling methods including sampled-data modeling, discrete-time analysis, time-domain analysis and describing function are all very mathematical and difficult to apply for practical engineers as little physical insight can be extracted. Up to now, no equivalent circuit model is proposed which is able to predict instability issue and serve as a useful design tool for V 2 control. This paper proposes a unified equivalent circuit model which is applicable to all types of capacitors by considering the effect of capacitor voltage ripple. The equivalent circuit provides physical insight of V 2 control as a non-ideal voltage source, a dual concept of previous non-ideal current source for current mode control. The equivalent circuit model is a simple yet accurate, complete model and is very helpful for design purpose. Optimal design guidelines for point-of-load applications are provided. The proposed equivalent circuit model is applicable to both variable frequency modulation and constant frequency modulation. The equivalent circuit model and design guidelines are verified with Simplis simulation and experimental results.Index Terms---Equivalent circuit model, V 2 control, ripplebased control, enhanced V 2 control and optimal design guidelines. d vo Driver iL RCo Co RL Ls Pulse Width Modulator vc V ref Hv Vin + -

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mentioning

confidence: 99%

mentioning

confidence: 99%

Unified Equivalent Circuit Model and Optimal Design of <inline-formula><tex-math>$V^{2}$</tex-math> </inline-formula> Controlled Buck Converters

Tian

Lee

et al. 2016

IEEE Trans. Power Electron.

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“…Maintaining the output within acceptable limits requires advanced control circuitry that is capable of executing sophisticated control algorithms. There are many advanced compensation techniques offering enhanced regulation performance [1]. Often, this is achieved at the expense of simplicity, cost and efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…These power supplies are generally constructed using traditional linear or switching regulator circuits, with a bridge rectifier and simple capacitor filter connected to the network via a transformer. Linear regulators are usually preferred to switching regulators for low power applications because of their extreme simplicity, reliability and low cost [1][2]. Linear regulators typically incorporate a series or shunt pass element in the form of a bipolar or a FET transistor, a control circuit in the form of DC comparator, a voltage reference and a feedback network as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Design of Fast Transient Response, Low Dropout Regulator with Enhanced Steady State Characteristics on the Basis of PID Control

Mumuni¹,

Mumuni²

2016

IJCSITCE

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“…In power conversion systems, analog controllers, based on opamps and comparators or pre-calculated PROM-based look-up tables, are widely used for applications such as low-power DC-DC converters that encompass relatively simple control algorithms but stringent requirements for high switching frequency [1]- [7]. But for more complex converters used for medium-to high-power conversion applications, such as three-phase converters, power factor correction converters, matrix converters, etc., a digital controller is a more suitable choice due to more complicated control algorithms and the availability of fast and inexpensive digital components [8]- [13].…”

Section: Power Conversion Systemsmentioning

confidence: 99%

Distributed, modular, open control architecture for power conversion systems

Guo

Boroyevich

Edwards³

2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551)

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(Abstract)Due to close coupling to hardware and lack of software engineering technologies, the control software in digitally controlled power conversion systems is difficult to design and maintain. This is a natural consequence of a topology-or application-driven design approach. This research work proposes a distributed, modular, open control architecture for power conversion systems to reduce control design complexity, encapsulate and localize design dependencies, reduce unnecessary redesign effort and improve software quality. Dataflow style is chosen as the architectural style for the proposed control architecture based on comparative analysis. The detailed implementation of the dataflow architecture is presented. The resulting dataflow control software is evaluated in comparison to the legacy approach to control design used in industry and academia. The dataflow control software for a 3-phase voltage source inverter is also tested on a real PEBB-based converter system. To further explore the flexibility of control composition that is brought by the dataflow approach, the feasibility of dynamic control reconfiguration is also presented as an important future research direction.iii To my parents, Longsheng Guo and Yu Wang iv ACKNOWLEDGEMENTSWhen I fist came to the Center for Power Electronics Systems (CPES) at Virginia Tech, I barely knew a single terminology in power electronics. Finally I come along all the way. I would never achieve this without all the help and support from so many people.First I would like to acknowledge my advisors Dr. Dushan Boroyevich and Dr.Stephen Edwards for their invaluable guidance, support and encouragement that carried me through this research work. They are not only advisors to me, but also taught me the paths to successful research and leadership. Applications......................................................................................... 71 6.1.2 Feasibility............................................................................................................ 75 6.1.3 Engineering Effort Endeavored to Control Software Development .................... This research work will concentrate on the digital control design and implementation for medium-to high-power conversion systems. Digital control of power converters has the following basic characteristics: Open-Loop LIST OF TABLES• It is embedded: The controller is hardware-oriented and has restricted resources [17]; and• it is hard real-time: control commands have to be updated for each switching period [18].Until quite recently, the legacy approach to the study, analysis and design of static power converters were still topology-or application-oriented. The actual production process of converters still suffered from a complete lack of generality in its approach The Problem: Closely Integrated Control Software with SystemHardware Because control software is easier to modify compared to other design domains, it is normally left as the last area to be implemented in the whole system design. The legacy ap...

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A novel control method for multiphase voltage regulators

Cited by 24 publications

References 2 publications

Unified Equivalent Circuit Model and Optimal Design of <inline-formula><tex-math>$V^{2}$</tex-math> </inline-formula> Controlled Buck Converters

Unified Equivalent Circuit Model and Optimal Design of <inline-formula><tex-math>$V^{2}$</tex-math> </inline-formula> Controlled Buck Converters

Design of Fast Transient Response, Low Dropout Regulator with Enhanced Steady State Characteristics on the Basis of PID Control

Distributed, modular, open control architecture for power conversion systems

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