Theoretical and experimental investigation of averaged modeling of non-ideal PWM DC-DC converters operating in DCM

Iftikhar, M. Usman; Lefranc, Pierre; Sadarnac, Daniel; Karimi, Charif

doi:10.1109/pesc.2008.4592277

Cited by 18 publications

(10 citation statements)

References 13 publications

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“…Model type Conventional state-space averaging (SSA) [1] Reduced order (low accuracy) Analytical equation Converter cell [2] Reduced order (low accuracy) Equivalent circuit Full-order SSA [3,8,11,12,20] Full order (high accuracy) Analytical equation Circuit averaging (CA) [4, 5, 8-10, 13, 14, 17-19, 21, 22] Full order (high accuracy) Equivalent circuit Improved SSA [6,7,15,16] Full order (high accuracy) Analytical equation…”

Section: Methods Name Ordermentioning

confidence: 99%

“…where m denotes the large-signal voltage gain and v i denotes the small signal input voltage. Expressing the variables as the sums of DC and AC components as (9)-(12) do yield (15), after cancelling the DC components, the small signal expression of the inductor current i L will become (16):…”

Section: Calculation Of the Small-signal Relationship With The Proposmentioning

confidence: 99%

“…where the results in (16) and (18) are equivalent. In the following section, we will use the proposed differentiation method (17) to calculate the small signal relationship.…”

Section: Calculation Of the Small-signal Relationship With The Proposmentioning

confidence: 99%

See 2 more Smart Citations

Review and Selection Strategy for High-Accuracy Modeling of PWM Converters in DCM

Mao¹,

Lam²,

Sin³

et al. 2018

Journal of Electrical and Computer Engineering

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Among various modeling methods for DC-DC converters introduced in the past two decades, the state-space averaging (SSA) and the circuit averaging (CA) are the most general and popular exhibiting high accuracy. However, their deduction approaches are not entirely equivalent since they incorporate different averaging processes, thus yielding different small signal transfer functions even under identical operating conditions. Some research studies claimed that the improved SSA can obtain the highest accuracy among all the modeling methods, but this paper discovers and clearly verifies that this is not the case. In this paper, we first review and study these two modeling methods for various DC-DC converters operating in the discontinuous conduction mode (DCM). We also streamline the general model-deriving processes for DC-DC converters, and test and compare the accuracy of these two methods under various conditions. Finally, we provide a selection strategy for a high-accuracy modeling method for different DC-DC converters operating in DCM and verified by simulations, which revealed necessary and beneficial for designing a more accurate DCM closed-loop controller for DC-DC converters, thus achieving better stability and transient response.

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Section: Methods Name Ordermentioning

confidence: 99%

Section: Calculation Of the Small-signal Relationship With The Proposmentioning

confidence: 99%

See 1 more Smart Citation

Review and Selection Strategy for High-Accuracy Modeling of PWM Converters in DCM

Mao¹,

Lam²,

Sin³

et al. 2018

Journal of Electrical and Computer Engineering

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show abstract

“…In practical, the voltage gain and the efficiency of classical converters such as boost and buck–boost converters are drastically reduced when the duty cycle approaches to the unity, due to the increase in the losses involving the parasitic components 18,34 . Although there exist several studies 34–39 considering this effect in DC–DC converter analysis, the methodology detailed in this paper can be used to derive the expression of the non‐ideal voltage gain of derived converters, making use of the basic converter equations, as follows:

G_{italicdif_italiclossy} = G_{1_italiclossy} + G_{2_italiclossy},

where G dif_lossy is the non‐ideal voltage gain of the HGDC, whereas G 1_ lossy and G 2_ lossy are the respective non‐ideal static gains of the basic converters.…”

Section: Influence Of Parasitic Componentsmentioning

confidence: 99%

Methodology for synthesis of high‐gain step‐up DC–DC converters based on differential connections

Salvador

Andrade

Lazzarin

et al. 2020

Circuit Theory & Apps

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This paper presents a new methodology for synthesis of high-gain step-up DC-DC converters. This methodology is based on the differential connection of two basic non-isolated DC-DC converters, in which the output voltages are respectively positive and negative with reference to a common terminal. Any load connected between these positive and negative terminals is subjected to a differential voltage equivalent to the sum of the voltages individually synthetized by each basic converter. When only non-isolated basic DC-DC converters (boost, buck-boost, Cuk, single-ended primary-inductor converter, and Zeta) are considered, six differential converters may be derived by the proposed methodology; nevertheless, voltage lifting techniques based on gain cells can also be applied to further extend the gain, resulting in others high-gain topologies. Besides the proposition of the methodology, the paper investigates the operating principle of the derived converters under different modulation strategies, evaluates the possibility of eliminating redundant components after integration, and correlates the obtained converters with already existing topologies. In fact, it is demonstrated that several high-gain step-up DC-DC converters previously published could be addressed as particular cases of differential connections of basic converters. Experimental results are presented to validate the methodology herein proposed.

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“…In the following section, the power loss breakdown analysis, not based on circuit modeling [21][22][23][24][25][26][27][28][29][30][31] but based on component datasheets, is shown under the condition that the converter operated at a rated load of 36 W.…”

Section: Power Loss Breakdown Analysismentioning

confidence: 99%

Improvement in Voltage Gain of Interleaved High Step-Down Converter

Hwu

Shieh

2020

Energies

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An interleaved high step-down converter is presented herein, which utilized a diode-capacitor module so as to make the step-down voltage gain under the same duty cycle as well as the voltage stresses on switches and diodes relatively low as compared with the existing circuits. Also, under the same voltage gain, the proposed circuit had a relatively large duty cycle, making the elapsed time per cycle for the connection between the input and the output enlarged, and hence the controller was not interrupted by noises. This converter can be used in low-output-power high-output-current applications. In this study, the basic operating principles of the proposed converter were firstly described and analyzed, and finally, its effectiveness was demonstrated by experiment.

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Theoretical and experimental investigation of averaged modeling of non-ideal PWM DC-DC converters operating in DCM

Cited by 18 publications

References 13 publications

Review and Selection Strategy for High-Accuracy Modeling of PWM Converters in DCM

Review and Selection Strategy for High-Accuracy Modeling of PWM Converters in DCM

Methodology for synthesis of high‐gain step‐up DC–DC converters based on differential connections

Improvement in Voltage Gain of Interleaved High Step-Down Converter

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