Simple and robust voltage controller for buck converters based on the coefficient ratio method

Yazıcı, İrfan

doi:10.1002/2050-7038.12409

Cited by 3 publications

(4 citation statements)

References 32 publications

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“…The buck converter depicted in Figure 1 a is widely known as the step-down converter since the output voltage is a fraction of the input voltage [ 37 ]. However, the reduction of the voltage input implies that the load current is higher when compared with the input.…”

Section: General Converters’ Modelingmentioning

confidence: 99%

Sensorless Adaptive Voltage Control for Classical DC-DC Converters Feeding Unknown Loads: A Generalized PI Passivity-Based Approach

Gil-González

Montoya

Restrepo

et al. 2021

Sensors

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The problem of voltage regulation in unknown constant resistive loads is addressed in this paper from the nonlinear control point of view for second-order DC-DC converters. The converters’ topologies analyzed are: (i) buck converter, (ii) boost converter, (iii) buck-boost converter, and (iv) non-inverting buck-boost converter. The averaging modeling method is used to model these converters, representing all these converter topologies with a generalized port-Controlled Hamiltonian (PCH) representation. The PCH representation shows that the second-order DC-DC converters exhibit a general bilinear structure which permits to design of a passivity-based controller with PI actions that ensures the asymptotic stability in the sense of Lyapunov. A linear estimator based on an integral estimator that allows reducing the number of current sensors required in the control implementation stage is used to determine the value of the unknown resistive load. The main advantage of this load estimator is that it ensures exponential convergence to the estimated variable. Numerical simulations and experimental validations show that the PI passivity-based control allows voltage regulation with first-order behavior, while the classical PI controller produces oscillations in the controlled variable, significantly when the load varies.

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Section: General Converters’ Modelingmentioning

confidence: 99%

Sensorless Adaptive Voltage Control for Classical DC-DC Converters Feeding Unknown Loads: A Generalized PI Passivity-Based Approach

Gil-González

Montoya

Restrepo

et al. 2021

Sensors

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“…where r and q are selected so that each coefficient of P z ð Þ can be set to the coefficients of P r z ð Þ individually and also satisfying the causality condition, namely r ≥ q. 34,40 As known, the type of closed-loop system should be at least 1 in order for the step-type disturbances to not cause the steady-state error. 43 Therefore, to eliminate the steady-state error against the step-type external disturbances the A z ð Þ controller polynomial in ( 14) should be arranged as follows.…”

Section: Design Procedures Of Controller Polynomialsmentioning

confidence: 99%

“…Similarly, the controller polynomials

A ((), z)

and

B ((), z)

can be defined as below,

\begin{matrix} true \\ A (z) = a_{r} z^{r} + a_{r - 1} z^{r - 1} + \dots + a_{1} z + a_{0} \\ B (z) = b_{q} z^{q} + b_{q - 1} z^{q - 1} + \dots + b_{1} z + b_{0} \end{matrix}

where r and q are selected so that each coefficient of

P ((), z)

can be set to the coefficients of

P_{r} ((), z)

individually and also satisfying the causality condition, namely r ≥ q 34,40 …”

Section: Discrete‐time Characteristic Ratio Based Controller Designmentioning

confidence: 99%

“…In Refs. 34, 40, it was shown that the transient‐response speed of the closed‐loop system can be adjusted with the generalized time‐constant if the characteristic‐ratio coefficients are kept the same. Therefore, the generalized time‐constant τ in (8) can be easily determined by considering the desired settling‐time t s for the closed‐loop system.…”

Section: Discrete‐time Characteristic Ratio Based Controller Designmentioning

confidence: 99%

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Discrete‐time robust voltage controller for buck converters based on the coefficient ratio method with open‐loop feed‐forward control

Yazıcı

Yalçın

2021

Int Trans Electr Energ Syst

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Summary In this study, a hybrid controller based on the discrete‐time characteristic ratio controller and an open‐loop feed‐forward controller is presented for voltage control of the buck converters used in many different applications. The presented controller is designed using a standard‐form characteristic ratio. The designed controller is supported by the open‐loop duty ratio as a feed‐forward term to improve its robustness against the disturbance, especially to changes in the input voltage. The performance of the designed controller to follow the change in the output‐voltage reference is investigated by simulation and real‐time experimental studies. By designing the presented controller for three different generalized time‐constants, it has been validated that the transient regime of the closed‐loop system can be adjusted without disrupting the general wave structure of the system response. The robustness of the designed controller for various disturbances such as the input‐voltage and load variations and parameter uncertainties has also been thoroughly investigated. The results of comparative simulation and real‐time experimental studies realized by the PID and CR method without FF term clearly demonstrated the superiority of the presented method.

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Evaluation of an Infinite-Level Inverter Operation Powered by a DC–DC Converter in Open and Closed Loop

Valencia Pavón,

Aguila Téllez,

Rojas Urbano

et al. 2024

Energies

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This paper evaluates the open- and closed-loop DC–DC converter operation within a DC coupling multilevel inverter architecture to obtain an infinite-level stepped sinusoidal voltage. Adding a cascade controller to the DC–DC converter should reduce the settling time and increase the number of levels in the output voltage waveform; it could decrease the speed error and phase shift concerning the sinusoidal reference signal. The proposed methodology consists of implementing an experimental multilevel inverter with DC coupling through a single-phase bridge inverter energized from a BUCK converter. Trigger signals for the two converters are obtained from a control circuit based in an ATMEGA644P microcontroller to explore its capabilities in power electronics applications. A digital controller is also implemented to evaluate the operation of the BUCK converter in open and closed loop and observe its influence in the stepped sinusoidal output voltage. The evaluation is performed to energize a resistive load with common output voltage in multilevel inverters, i.e., 3, 5, 7, 11, and infinity levels. Results show that during the design stage, fast dynamic elements, like the storage capacitor, can be used to obtain a minimum THD because the settling time is sufficiently fast, the speed error remains small, and there is no need for a controller. A digital controller requires processing time, and although in theory it can reduce the settling time to a minimum, the processor introduces latency in the control signals generation, producing the opposite effect. Controller complexity of the digital controller must be considered because it increases processing time and influences the efficiency of the closed-loop operation.

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Simple and robust voltage controller for buck converters based on the coefficient ratio method

Cited by 3 publications

References 32 publications

Sensorless Adaptive Voltage Control for Classical DC-DC Converters Feeding Unknown Loads: A Generalized PI Passivity-Based Approach

Sensorless Adaptive Voltage Control for Classical DC-DC Converters Feeding Unknown Loads: A Generalized PI Passivity-Based Approach

Discrete‐time robust voltage controller for buck converters based on the coefficient ratio method with open‐loop feed‐forward control

Evaluation of an Infinite-Level Inverter Operation Powered by a DC–DC Converter in Open and Closed Loop

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