PI and PWM Sliding Mode Control of POESLL Converter

Jazi, Hadi Nasiri; Goudarzian, Alireza; Pourbagher, Rohallah; Derakhshandeh, Sayed Yaser

doi:10.1109/taes.2017.2684998

Cited by 26 publications

(9 citation statements)

References 25 publications

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“…The efficacy of the delineated sliding mode control scheme in Figure 8 is experimentally validated on a 48-to-12 V, 25 W test circuit under CCM operation. CLSDC's rated duty ratio of 54% is computed from Equation 3, and the requisite L-C elements are designed using Equation 8 for: rip c ≤ 30% and On the basis of the steps provided in the previous section, SMC gains of K p = 0.004 and K i = 2.7 × 10 4 are set to fulfill standard transient requirements 30,32,34 like start-up/disturbance settling time (T set ) ≤ 10 ms, maximum peak overshoot (M p ) ≤ 20%, widely followed in switched-mode power supplies (SMPS). Table 5 represents CLSDC specifications and components used to build the prototype circuit.…”

Section: Selection Of Circuits Components and Controller Gainsmentioning

confidence: 99%

“…By due fulfillment of Table 3 voltage and current stress expressions, switching devices selected in the prototype development include IRFP260N power MOSFET as switch (S) and NTSV30100S Schottky diode as D 1 , D 2 , D 3 , D 4 , and D 5 . On the basis of the steps provided in the previous section, SMC gains of K p = 0.004 and K i = 2.7 × 10 4 are set to fulfill standard transient requirements 30,32,34 like start‐up/disturbance settling time (T set ) ≤ 10 ms, maximum peak overshoot (M p ) ≤ 20%, widely followed in switched‐mode power supplies (SMPS). Table 5 represents CLSDC specifications and components used to build the prototype circuit.…”

Section: Selection Of Circuits Components and Controller Gainsmentioning

confidence: 99%

“…27,28 Nonlinear controllers such as the sliding mode one, possessing inherent robustness as well as simple control law formulation process, have therefore been a popular choice. 28 To avoid high switching losses, EMI issues, and filter design complications observed with conventional sliding mode controller (SMC), the recent attention is focused toward realizing a fixed-frequency SMC [29][30][31][32] (FFSMC). As steady-state error is a prevalent issue of FFSMC, integral action incorporation within control law is quite popular to mitigate steady-state error.…”

mentioning

confidence: 99%

“…29,30 This benefit actually needs tradeoff on controller order, transient response, and simpler implementation. 31 An improvised sliding surface derived from Jazi et al 32 has therefore been constituted for CLSDC, which can effectually mitigate steady-state error and realization complexities. An equivalent control signal of this surface involves sensing of source and load side capacitor voltages, and thereby it promises low implementation cost apart from a better dynamic behavior.…”

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Analysis and control of a single switch wider step‐down gain DC–DC converter for low‐voltage applications

Misal

Veerachary

2020

Circuit Theory & Apps

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This paper presents a point-of-load transformerless DC-DC converter having a wider step-down conversion ratio. In comparison with quadratic/stacked buck converter variants, the presented topology exhibits nonpulsating source current, more effective switch utilization at small voltage gains, and reduced current stress on components. Its comprehensive steady-state analysis is carried out under continuous and discontinuous modes of inductor currents, and design criteria to select L-C components are established. State variable dependency feature in the topology, imposing a reduced fourth-order dynamics, is discussed and subsequently verified from its average model. A fixed frequency sliding mode controller is then designed with a step-by-step evaluation of sliding surface existence, reachability, and stability conditions. The equivalent control law devised in this scheme is duly constituted from source side inductor current dynamics and load voltage error information, so it facilitates simple realization as well as better transient response. Remarkable operational characteristics of the presented converter are studied analytically and demonstrated with experimental observations on a laboratory prototype. K E Y W O R D S buck converter, charge pump network, equivalent sliding mode control, wider voltage gain 1 | INTRODUCTION The recent shift in paradigm toward low-power electronic systems has evolved several variants of DC-DC stepdown converter to be incorporated in advanced point-of-load (PoL) applications. 1,2 Battery chargers, data servers, automotive drivetrains, photovoltaic (PV) energy systems, and LED ballasts are some typical PoL examples 1-3 powered from unregulated 36/42/48 V DC bus or battery packs as shown in Figure 1 to operate within 1.2-12 V range, drawing high currents up to 20 A. Because a traditional buck converter (TBC) offers simple dynamics and low-cost advantages, it has predominantly governed the power supply market. However, key structural limitations such as restricted range of duty ratios (below 10%) to realize lower voltages, poor efficiency and transient performance at such narrow duty ranges, and elevated source current ripples have overshadowed TBC benefits. 3 Without forgoing TBC's eminent structural characteristics, extreme voltage step-down becomes an arduous task. High frequency DC transformer inclusion on source side although provided a reliable addressal measure, but it came through hefty compromise on topological bulkiness, cost, and magnetizing losses. 3,4 Modern [*Corrections added on 14 August 2020, after first online publication: The correct ORCID Id of Mummadi Veerachary has been added.]

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Section: Selection Of Circuits Components and Controller Gainsmentioning

confidence: 99%

Section: Selection Of Circuits Components and Controller Gainsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Analysis and control of a single switch wider step‐down gain DC–DC converter for low‐voltage applications

Misal

Veerachary

2020

Circuit Theory & Apps

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“…The drawback of this technique is that it sacrifices the disturbance rejection performance in this boundary layer. The fixed switching frequency using PWM is also reported in [38][39][40][41][42][43][44][45]. However, in this work the ideal equivalent control signal, computed from the measured system states, is PWM modulated.…”

Section: Introductionmentioning

confidence: 99%

A Novel Filter Extracted Equivalent Control Based Fixed Frequency Sliding Mode Approach for Power Electronic Converters

2019

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The key issue in the implementation of the Sliding Mode Control (SMC) in analogue circuits and power electronic converters is its variable switching frequency. The drifting frequency causes electromagnetic compatibility issues and also adversely affect the efficiency of the converter, because the proper size of the inductor and the capacitor depends upon the switching frequency. Pulse Width Modulation based SMC (PWM-SMC) offers the solution, however, it uses either boundary layer approach or employs pulse width modulation of the ideal equivalent control signal. The first technique compromises the performance within the boundary layer, while the latter may not possess properties like robustness and order reduction due to the absence of the discontinuous function. In this research, a novel approach to fix the switching frequency in SMC is proposed, that employs a low pass filter to extract the equivalent control from the discontinuous function, such that the performance and robustness remains intact. To benchmark the experimental observations, a comparison with existing double integral type PWM-SMC is also presented. The results confirm that an improvement of 20% in the rise time and 25.3% in the settling time is obtained. The voltage sag during step change in load is reduced to 42.86%, indicating the increase in the robustness. The experiments prove the hypothesis that a discontinuous function based fixed frequency SMC performs better in terms of disturbances rejection as compared to its counterpart based solely on ideal equivalent control.

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Modeling and implementation of a new boost converter with elimination of right‐half ‐plan zero

Goudarzian

Khosravi

Raeisi

2020

Int Trans Electr Energ Syst

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Summary Conventional boost converters used for fuel‐cell applications suffer from a slow dynamic response, due to their non‐minimum phase nature. It is the main challengeable problem in the development of boost topologies working in continuous‐conduction mode (CCM). In order to eliminate the mentioned disadvantage, a boost converter is proposed in this article which is capable to give a high voltage gain. From viewpoint of the boosting feature, the proposed topology is more appropriate to connect a low input voltage to a higher dc voltage of load. Moreover, the duty‐cycle‐to‐output‐voltage transfer function of this converter is free from the right‐half‐plane zero (RHPZ) and therefore, its dynamics are simpler and faster compared with the classical boost converter. To cancel the RHPZ, improve the dynamic behavior and enhance the voltage transfer gain, a separate forward path is provided using a transformer and an additional capacitor in the output node for transferring the input energy to the output load during the switch‐on time interval of the power switch. For derivation of the converter model, the steady state analysis is given in details and the required equations are formulated. The transfer function expression is obtained using the averaging model of the converter and then, the description and comparisons are introduced to reveal the features and superiority of the proposed converter. Also, a laboratory set‐up of the suggested dc/dc boost converter working in CCM is built and tested.

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PI and PWM Sliding Mode Control of POESLL Converter

Cited by 26 publications

References 25 publications

Analysis and control of a single switch wider step‐down gain DC–DC converter for low‐voltage applications

Analysis and control of a single switch wider step‐down gain DC–DC converter for low‐voltage applications

A Novel Filter Extracted Equivalent Control Based Fixed Frequency Sliding Mode Approach for Power Electronic Converters

Modeling and implementation of a new boost converter with elimination of right‐half ‐plan zero

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