scholarly journals Characteristic frequencies in averaged description of step-down (BUCK) DC-DC power converter

2016 ◽  
Vol 65 (4) ◽  
pp. 703-717
Author(s):  
Włodzimierz Janke
Keyword(s):  
Power Converter ◽  
Buck Converter ◽  
Small Signal ◽  
Characteristic Frequencies ◽  
Dc Power ◽  
Switch Mode ◽  
Power Stage ◽  
Control Circuits ◽  
Poles And Zeros ◽  
Conduction Mode

AbstractIn the description of small-signal transmittances of switch-mode power converters several characteristic frequencies are usually used, corresponding to poles and zeros of transmittances. The knowledge of these frequencies is important in the design of control circuits for converters and usually are assumed to be constant for a given power stage of a converter. The aim of the paper is to evaluate the influence of converter primary parameters and load conductance on characteristic frequencies. Analytical derivations and numerical calculations are performed for an ideal and non-ideal BUCK converter working in continuous or discontinuous conduction mode.

scholarly journals Influence of output conductance on characteristic frequencies of switch mode BUCK and BOOST converter

2017 ◽  
Vol 66 (1) ◽  
pp. 165-178
Author(s):  
Włodzimierz Janke ◽  
Marcin Walczak
Keyword(s):  
Transfer Functions ◽  
Signal Control ◽  
Small Signal ◽  
Main Attention ◽  
Characteristic Frequencies ◽  
Switch Mode ◽  
Good Consistency ◽  
Poles And Zeros ◽  
Conduction Mode ◽  
Output Conductance

Abstract Characteristic frequencies corresponding to poles and zeros of small-signal control-to-output transfer functions of popular DC-DC converters (BUCK and BOOST) are analyzed. The main attention is paid to influence of load conductance on the characteristic frequencies for converters working in continuous conduction mode (CCM) as well as in discontinuous conduction mode (DCM). Parasitic resistances of all converter components are included in calculations. In addition the improved description of CCM-DCM boundary is presented. The calculations are verified experimentally and good consistency of the results is observed.

An Improved Dynamic Surface Control Approach and Applications to the Control of DC-DC Power Converter

2012 ◽  
Vol 229-231 ◽  
pp. 811-814
Author(s):  
Wen Lei Li
Keyword(s):  
Dynamic Surface Control ◽  
Power Converter ◽  
Buck Converter ◽  
Parameter Uncertainties ◽  
Dynamic Surface ◽  
Control Approach ◽  
Controlled Systems ◽  
Dc Power ◽  
Surface Control ◽  
Equivalence Criterion

This article presents an improved dynamic surface control (IDSC) approach for DC-DC Buck converter with parameter uncertainties and external disturbances. For IDSC method, the parameters update laws are designed based on uncertainty equivalence criterion, the requirements to the controlled systems are reduced, and the problem of explosion of complexity can be overcome. The features of the derived controller are discussed and illustrated by the Simulation study. The analysis and simulation show that the obtained controller possesses good adaptability and robustness to system uncertainties.

scholarly journals A New Buck-Boost AC/DC Converter with Two-Terminal Output Voltage for DC Nano-Grid

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3808 ◽  
Author(s):  
Xiangkun Li ◽  
Weimin Wu ◽  
Houqing Wang ◽  
Ning Gao ◽  
Henry Shu-hung Chung ◽  
...  
Keyword(s):  
Steady State ◽  
Output Voltage ◽  
Operating Principle ◽  
Small Signal ◽  
Grid System ◽  
Power Sources ◽  
Steady State Analysis ◽  
Dc Power ◽  
Signal Modelling ◽  
Conduction Mode

Due to the development and deployment of renewable DC power sources and their inherent advantages for DC loads in applications, the DC nano-grid has attracted more and more research attentions; especially the topologies of AC/DC converters are increasingly studied. When designing an AC to DC converter for a DC nano-grid system, the grounding configuration, which determines the costs, the efficiency as well as the safety, plays an important role. A three-terminal output AC to DC converter based on united grounding configuration has been presented for DC nano-grid. However, it has to be pointed out that the three-terminal output DC nano-grid is not as popular as the two-terminal DC output one, due to the infrastructure consideration. This paper proposes a new Buck-Boost AC to DC converter with two-terminal output voltage for DC nano-grid. The operating principle, the steady-state analysis, and the small signal modelling for the proposed converter working in continuous conduction mode are presented in detail. A 220 V/50 Hz/800 W prototype was fabricated to verify the effectiveness of the proposed converter.

Desing and Implementation of a Microcontroller Based Buck Boost Converter as a Smooth Starter for Permanent Magnet Motor

2016 ◽  
Vol 1 (3) ◽  
pp. 566
Author(s):  
S. Ravi ◽  
Vitaliy Mezhuyev ◽  
K. Iyswarya Annapoorani ◽  
P. Sukumar
Keyword(s):  
Permanent Magnet ◽  
Input Signal ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Power Converter ◽  
Boost Converter ◽  
Buck Converter ◽  
Permanent Magnet Motor ◽  
Dc Power ◽  
The Given

<p>This proposal proposes a DC/DC Buck Boost converter which has been used as a smooth starter for a DC Permanent Magnet Motor. In the existing system the DC/DC Buck Converter is used which provide the output less than the input Signal. Using buck converter it is difficult to increase the value of the input signal. Hence DC/DC Buck- Boost Converter used from which it is possible to get both the increased and decreased output from the given input. Previously pulse width modulation signals with respective to motor voltage is used. However they produce variations in the voltage and current of the motor. The above problem is overcome by using DC/DC Power converter. The proposed system with reduction in size, reduced ripples and increase in speed makes the system to operate at both low and high power applications. The proposed system results in higher efficiency, reduces the ripple content and the stress. The results are validated through MATLAB/Simulink and real time implementation.</p>

Adaptive PD+I Control of a Switch-Mode DC–DC Power Converter Using a Recursive FIR Predictor

2011 ◽  
Vol 47 (5) ◽  
pp. 2135-2144 ◽  
Author(s):  
Maher Algreer ◽  
Matthew Armstrong ◽  
Damian Giaouris
Keyword(s):  
Power Converter ◽  
Dc Power ◽  
Switch Mode

scholarly journals Modeling and Analysis of a PCM-Controlled Boost Converter Designed to Operate in DCM

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 4 ◽  
Author(s):  
Teuvo Suntio
Keyword(s):  
Dynamic Models ◽  
Control Method ◽  
Operation Mode ◽  
Current Mode ◽  
Boost Converter ◽  
Open Loop ◽  
Buck Converter ◽  
Small Signal ◽  
Modeling And Analysis ◽  
Power Stage

Peak current-mode (PCM) control has been a very popular control method in power electronic converters. The small-signal modeling of the dynamics associated with PCM control has turned out to be extremely challenging. Most of the modeling attempts have been dedicated to the converters operating in continuous conduction mode (CCM) and just a few to the converters operating in discontinuous operation mode (DCM). The DCM modeling method published in 2001 was proven recently to be very accurate when applied to a buck converter. This paper provides the small-signal models for a boost converter and analyses for the first time its real dynamic behavior in DCM. The objectives of this paper are as follows: (i) to provide the full-order dynamic models for the DCM-operated PCM-controlled boost converter; (ii) to analyze the accuracy of the full and reduced-order dynamic models; and iii) to verify the validity of the high-frequency extension applied in the DCM-operated PCM-controlled buck converter in the case of the boost converter. It is also shown that the DCM-operated boost converter can operate only in even harmonic modes, similar to all the CCM-operated PCM-controlled converters. In the case of the DCM-operated PCM-controlled buck converter, its operation in the odd harmonic modes is the consequence of an unstable pole in its open-loop power-stage dynamics.

Mathematical modelling and analysis of voltage super-lift power dc-dc converter for enhanced dynamic characteristics in CCM

2019 ◽  
Vol 38 (2) ◽  
pp. 759-776
Author(s):  
Durga Devi R. ◽  
Nageswari S.
Keyword(s):  
Mathematical Model ◽  
State Space ◽  
State Space Model ◽  
Power Converter ◽  
State Equations ◽  
Content Type ◽  
Dc Power ◽  
Power Stage ◽  
Analysis Of Dynamics ◽  
Matlab Programming

Purpose The purpose of this paper is to propose a mathematical model for voltage super-lift dc-dc power converter in continuous conduction mode (CCM). Using the presented mathematical model, the analysis of dynamics of power stage for voltage super-lift dc-dc power converter can be performed. Design/methodology/approach The proposed method is based on the average state space model using the state equations of the dc-dc power converter. In the proposed method, the converter is represented as a set of differential equations derived for each switching state of the power switch in terms of inductor current and capacitor voltage. The proposed method describes the dynamic behaviour of the system. The controller is designed to meet performance requirement of the system such as to maintain the dynamics such as stability, steady-state accuracy and the speed of response of the system. Using the obtained model, the analysis of dynamic response of the voltage super-lift dc-dc power converter can be performed. Findings The converter is modelled and verified using conventional circuit analysis method employing state-space averaging technique, and their corresponding transfer function is also derived. The dynamics of the converter is investigated using frequency response characteristics obtained using MATLAB programming environment. In addition, to improve the stability of the converter, proportional-integral controller is designed using Ziegler–Nichols tuning rules, and the effect of the compensator in the plant is also investigated. Originality/value The proposed method can be used for analysing the dynamics of power stage for voltage super-lift DC-DC power converter.

Averaged models of pulse-modulated DC-DC power converters. Part II. Models based on the separation of variables

2012 ◽  
Vol 61 (4) ◽  
pp. 633-654 ◽  
Author(s):  
Włodzimierz Janke
Keyword(s):  
Power Converters ◽  
Averaging Method ◽  
Separation Of Variables ◽  
Small Signal ◽  
Large Signal ◽  
Dc Power ◽  
Switch Mode ◽  
Standard Models ◽  
Averaged Models ◽  
The Ideal

Abstract The separation of variables approach to formulate the averaged models of DC-DC switch-mode power converters is presented in the paper. The proposed method is applied to basic converters such as BUCK, BOOST and BUCK-BOOST. The ideal converters or converters with parasitic resistances, working in CCM and in DCM mode are considered. The models are presented in the form of equation systems for large signal, steady-state and small-signal case. It is shown, that the models obtained by separation of variables approach differ in some situations from standard models based on switch averaging method.

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