Discrete Time Domain Modelling and Analysis of Dc-Dc Converters With Continuous and Discontinuous Inductor Current

Iwens, R. P.; Lee, F.C.; Triner, J. E.

doi:10.1016/b978-0-08-022014-7.50016-3

Cited by 3 publications

(6 citation statements)

References 5 publications

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“…There is an obvious phase difference between these two modulation components, as shown in parts (a) and (b) of Figs. [6][7][8][9]. A modulation voltage of this type carries a phase lead with respect to the capacitor voltage.…”

Section: Comparison Of Simulation Resultsmentioning

confidence: 98%

“…Careful examination of Figs. [6][7][8][9] indicates that the ESR waVeforms consist of two modulation components: amplitude modulation and PWM; the former is due to the inductor-current-modulation effect, the latter is due to the filter capacitor ESR. There is an obvious phase difference between these two modulation components, as shown in parts (a) and (b) of Figs.…”

Section: Comparison Of Simulation Resultsmentioning

confidence: 99%

“…The inductor current, capacitor voltage, and output voltage waveforms were plotted for four different modulation frequencies, as shown in Figs. [6][7][8][9]. The jagged curve in all figures was determined by the actual circuit equations (1) and (2); the smoother continuous curve by the averaged equation (3).…”

Section: Comparison Of Simulation Resultsmentioning

confidence: 99%

“…Examples of these techniques are CSMP [3], IMAG III [41, ECAP [5], SPICE 2 [19], and SCEPTRE [20]. Other numerical techniques use a computer-aided analysis employing a discrete time domain technique [6][7][8][9].…”

Section: A Numerical Techniquesmentioning

confidence: 99%

See 3 more Smart Citations

Improved Switching Converter Model Using Discrete and Averaging Techniques

Shortt

Lee

1983

IEEE Trans. Aerosp. Electron. Syst.

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The nonlinear modeling and analysis of dc-dc converters has been done by averaging and discrete-sampling techniques. The averaging technique is simple, but inaccurate, as the modulation frequencies approach the theoretical limit of one-half the switching frequency. The discrete technique is accurate even at high frequencies, but is very complex and cumbersome. An improved model is developed by combining the aforementioned techniques. This new model is easy to implement in circuit and state variable forms and is accurate to the theoretical limit.

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Section: Comparison Of Simulation Resultsmentioning

confidence: 98%

Section: Comparison Of Simulation Resultsmentioning

confidence: 99%

Section: Comparison Of Simulation Resultsmentioning

confidence: 99%

Section: A Numerical Techniquesmentioning

confidence: 99%

See 2 more Smart Citations

Improved Switching Converter Model Using Discrete and Averaging Techniques

Shortt

Lee

1983

IEEE Trans. Aerosp. Electron. Syst.

Self Cite

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show abstract

“…Nevertheless, extending the frequency range at which the model remains valid can help improving transient responses, which may be desirable under aggressive load variations. The above can be achieved using alternative modeling approaches, but the additional cost is increasing the complexity of the analysis 63,64,65 …”

Section: Case Studiesmentioning

confidence: 99%

A robust energy processing method for fuel cell systems supplying a time‐varying uncertain load

Ramírez

2022

Intl J of Energy Research

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Summary Robustness and performance are key properties that can contribute to the widespread dissemination of fuel cell systems (FCSs) as power sources, and a precise output voltage can serve as a reliable criterion to evaluate these properties. In this paper, we propose to utilize intentional time delays as part of controllers to achieve proper output voltage regulation in an FCS. In the past few years, there has been a growing interest toward designing controllers with intentional delays to render improved responses and better noise attenuation capabilities in various classes of systems and this investigation extends the use of delay‐based controllers to the application field of FCSs. A natural progression of this research, which to our knowledge has not been addressed, pertains to how such controllers perform in the presence of uncertainties, and whether or not these controllers can accommodate these uncertainties. In this research work, we present a solution to this open problem on a class of proportional integral retarded (PIR) controllers when controlling an FCS supplying a time‐varying uncertain load. Through stability theory, the safe operation of the PIR controlled FCS is systematically guaranteed in spite of uncertain loads and input voltages. Specifically, based on Lyapunov methods and L2‐gain analysis, we derive simple stability conditions to achieve robustness and H∞ performance. We show that utilizing only output voltage measurements the PIR controller can maintain the predictive features of a pure differentiator, but without its inherent noise amplification problems. Hence, low‐pass filtering of signals or reconstruction of the states can be obviated. Compared with published control schemes for FCSs, the PIR controller is structurally simpler and practically realizable, and it is able to maintain robustness against uncertain loads and H∞ performance under exogenous signals without relying on disturbance estimators. Numerical simulations confirm the superiority of the PIR controller over benchmark proportional integral and proportional integral derivative controllers in terms of robustness, performance and noise attenuation capabilities.

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Design of Completely Inserted and Feeding Electrode for Female Screw in Electrochemical Finishing

2007

KEM

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This study discusses electrochemical finishing of female screw using different types of completely inserted electrodes as well as feeding electrodes for die material. In the experiment, four types of design electrode are completely inserted and put through both continuous and pulse direct current and another four types of electrode are used with the application of continuous direct current and axial electrode feed. The controlled factors include the chemical composition and the concentration of the electrolyte, the electrolyte temperature, the flow rate of electrolyte, rotational speed of the electrode, current density, and current rating. The parameters are electrolytic time, die material, pulse period, feed rate of the electrode, and electrode geometry. For inserted electrodes, an electrode with thin plate provides more sufficient discharge space, which is advantageous for polishing. The electrode of single plate performs better than the double plate. Pulse direct current can promote the effect of electrochemical finishing, but the machining time is longer and the cost is raised. For feeding electrodes, an electrode of one side borer tip and thinner heavy section performs the best polishing effect in the current investigation. The electrochemical finishing after screw cutting just needs quite short time to make the surface of female screw smoothing and bright.

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Discrete Time Domain Modelling and Analysis of Dc-Dc Converters With Continuous and Discontinuous Inductor Current

Cited by 3 publications

References 5 publications

Improved Switching Converter Model Using Discrete and Averaging Techniques

Improved Switching Converter Model Using Discrete and Averaging Techniques

A robust energy processing method for fuel cell systems supplying a time‐varying uncertain load

Design of Completely Inserted and Feeding Electrode for Female Screw in Electrochemical Finishing

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