Buck Converter in Open Loop

2015 ◽  
pp. 21-27 ◽  
Author(s):  
Mahesh Patil ◽  
Pankaj Rodey
Keyword(s):  
Open Loop ◽  
Buck Converter

scholarly journals Stability Analysis and Optimal Design for Virtual Impedance of 48 V Server Power System for Data Center Applications

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5253
Author(s):  
Chien-Chun Huang ◽  
Sheng-Li Yao ◽  
Huang-Jen Chiu
Keyword(s):  
Open Loop ◽  
Buck Converter ◽  
Output Impedance ◽  
Signal Model ◽  
Passive Components ◽  
The Past ◽  
Feedback Compensation ◽  
Series Systems ◽  
The Relationship ◽  
Virtual Impedance

In the past literature on virtual impedance to series systems, most of the discussion focused on stability without in-depth research on the system design of the series converter and the overall output impedance. Accordingly, this study takes an open-loop resonant LLC converter series-connected closed-loop Buck converter as an example. First, the conditions required for the direct connection of the small-signal model in the series, the effect of feedback compensation on the input impedance of the load stage, the operating frequency, and passive components of the two-stage converter are discussed in detail―the relationship between the matching and the output impedance. Afterwards, a mathematical model is used to discuss the effect of adding parallel virtual impedance on the output impedance of the overall series converter and then derive an optimized virtual impedance design. Finally, an experimental platform of 48 V to 12 V and maximum wattage of 96 W are implemented. The output impedance of the series converter is measured with an impedance analyzer to verify the theoretical analysis proposed in this paper.

scholarly journals Chaotic Behavior in a Switched Dynamical System

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Fatima El Guezar ◽  
Hassane Bouzahir
Keyword(s):  
Hybrid Systems ◽  
Chaotic Dynamics ◽  
Chaotic Behavior ◽  
Numerical Study ◽  
Piecewise Linear ◽  
Open Loop ◽  
Buck Converter ◽  
Modeling Techniques ◽  
Scientific Laboratory ◽  
Switched Dynamical System

We present a numerical study of an example of piecewise linear systems that constitute a class of hybrid systems. Precisely, we study the chaotic dynamics of the voltage-mode controlled buck converter circuit in an open loop. By considering the voltage input as a bifurcation parameter, we observe that the obtained simulations show that the buck converter is prone to have subharmonic behavior and chaos. We also present the corresponding bifurcation diagram. Our modeling techniques are based on the new French native modeler and simulator for hybrid systems called Scicos (Scilab connected object simulator) which is a Scilab (scientific laboratory) package. The followed approach takes into account the hybrid nature of the circuit.

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.

scholarly journals Simulation of Open Loop and Closed Loop Synchronous Buck Converter for LED Applications

IJIREEICE ◽  
2017 ◽  
Vol 5 (2) ◽  
pp. 112-115
Author(s):  
Deekshitha C ◽  
K. Latha Shenoy
Keyword(s):  
Closed Loop ◽  
Open Loop ◽  
Buck Converter

scholarly journals Design and Simulation of Isolated Forward Buck Converter based Switched Mode Power Supply

2019 ◽  
Vol 8 (9) ◽  
pp. 2689-2693
Keyword(s):  
Power Supply ◽  
Supply Voltage ◽  
Pi Controller ◽  
Open Loop ◽  
Buck Converter ◽  
Design And Implementation ◽  
Feedback Network ◽  
Switched Mode Power Supply

In this paper, design and implementation of Switched mode power supply is analysed for various alterations of the supply voltage. Proper components were selected and its functionality was verified in NI-MULTISIM as a simulator. At first open loop configuration was designed, implemented and its functionality was examined in NI-MULTISIM. To examine the performance of the proposed system, PI controller is embedded using PWM based feedback network, and successfully verified in NI-MULTISIM

scholarly journals Disturbance Observer-Based Offset-Free Global Tracking Control for Input-Constrained LTI Systems with DC/DC Buck Converter Applications

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4079
Author(s):  
Kyunghwan Choi ◽  
Dong Soo Kim ◽  
Seok-Kyoon Kim
Keyword(s):  
Tracking Control ◽  
Disturbance Observer ◽  
Linear Time ◽  
Estimation Error ◽  
Open Loop ◽  
Buck Converter ◽  
Invariance Property ◽  
Linear Time Invariant ◽  
Global Tracking ◽  
Time Invariant

This paper presents an offset-free global tracking control algorithm for the input-constrained plants modeled as controllable and open-loop strictly stable linear time invariant (LTI) systems. The contribution of this study is two-fold: First, a global tracking control law is devised in such a way that it not only leads to offset-free reference tracking but also handles the input constraints using the invariance property of a projection operator embedded in the proposed disturbance observer (DOB). Second, the offset-free tracking property is guaranteed against uncertainties caused by plant-model mismatch using the DOB’s integral action for the state estimation error. Simulation results are given in order to demonstrate the effectiveness of the proposed method by applying it to a DC/DC buck converter.

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