A Non-Ideal SEPIC DCM Modeling for LED Lighting Applications

Bertoldi, Bruno; Bridon, Marcio Moura; DallrAsta, Matheus Schramm; Mocellini, Marcos Paulo; Roig, G.; Kirsten, André Luís; Heldwein, Marcelo Lobo

doi:10.1109/spec.2018.8635896

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…To determine the value of the switching loss resistor component, an energy balance equation was used. A SEPIC operating in DCM was selected to drive a light-emitting diode (LED) for constant voltage application [11]. An average and a switching model were developed, modeled in MATLAB/Simulink, and validated against the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Generalized Circuit Averaging Technique for Two-Switch PWM DC-DC Converters in CCM

Surya¹,

Williamson

2021

Electronics

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Design of DC-DC converters like Cuk and SEPIC, which are fourth-order converters, play a vital role in the design of electric vehicle (EV) charging systems and drivers for LED. These converters possess a unique feature of input current being continuous due to the presence of an inductor in series with the supply voltage. In the present work, a generalized approach for obtaining the frequency response of the transfer function of the duty cycle to output voltage (Gvd) for converters operating in continuous conduction mode (CCM) having two switches is proposed. A practical Cuk converter and SEPIC operating in CCM were selected and their analyses in open loop were studied using the LTSpice simulation tool. The behavior of the output voltage and inductor currents under variable ESR’s (equivalent series resistance) of inductors was studied. It was observed that Gvd of these converters was unstable. Hence, an appropriate controller to stabilize the system and achieve a proper gain margin and phase margin in closed-loop operation is required.

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Section: Introductionmentioning

confidence: 99%

Generalized Circuit Averaging Technique for Two-Switch PWM DC-DC Converters in CCM

Surya¹,

Williamson

2021

Electronics

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“…More detailed non-ideal models have been proposed to develop the two-valued resistor model which is a primitive approach. Some parasitic effects of semiconductor elements and some parameters such as voltage drops are included in the models (Bertoldi et al , 2018; Iftikhar et al , 2008; Baidhani et al , 2018). Thus, the analysis results have got closer to the more accurate.…”

Section: Introductionmentioning

confidence: 99%

Unified and non-ideal switch model for analysis of switching circuits

Pekdemir

Yıldız

2021

COMPEL

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Purpose This paper aims to propose a new unified and non-ideal switch model for analysis of switching circuits. Design/methodology/approach The model has a single unified structure that includes all possible states (on, off) of the switches. The analysis with the proposed switch model requires only one topology and uses the single system equation regardless of states of switches. Moreover, to improve accuracy, the model contains the on-state resistance and capacitive effect of switches. The system equations and the states of switches are updated by control variables, used in the model. Findings There are no restrictions on circuit topology and switch connections. Switches can be internally and externally controlled. The non-ideal nature of the model allows the switch to be modeled more realistically and eliminates the drawbacks of the ideal switch concept. After modeling with the proposed switch model, a linear circuit is obtained. Two examples related to switching circuits are included into the study. The results confirm the accuracy of the model. Originality/value This paper contributes a different switch model for analysis of switching converters to the literature. The main advantage of the model is that it has a unified and non-ideal property. With the proposed switch model, the transient events, like voltage spikes and high-frequency noises, caused by inductor and capacitor elements at switching instants can be observed properly.

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“…It was shown that the losses in the converters are primarily contributed by switching and not by conduction. In [2], a SEPIC operating in DCM was selected to drive a Light-Emitting Diode (LED) for constant voltage application. An average and a switching model was developed, modeled in MATLAB / Simulink and validated against the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Generalized Circuit Averaging Technique for Two Switch DC- DC Converters

Surya¹,

Channegowda

Naraharisetti

2020

2020 8th International Conference on Power Electronics Systems and Applications (PESA)

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Cuk and SEPIC are some of the important DC-DC converters used for charging batteries. In this paper, a generalized circuit averaging technique is employed for Cuk and SEPIC converters. The derived equations are used to obtain the frequency response of open loop transfer function. The ratio of perturbed output voltage to duty cycle (G vd ) is simulated using LTSpice software package. The derived averaged models of the converters aids in faster and simpler simulation. The behavior of the converters in CCM and DCM was also simulated. The derived expressions can be generalized to power converters with two switches.

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A Non-Ideal SEPIC DCM Modeling for LED Lighting Applications

Cited by 4 publications

References 21 publications

Generalized Circuit Averaging Technique for Two-Switch PWM DC-DC Converters in CCM

Generalized Circuit Averaging Technique for Two-Switch PWM DC-DC Converters in CCM

Unified and non-ideal switch model for analysis of switching circuits

Generalized Circuit Averaging Technique for Two Switch DC- DC Converters

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