Signal flow graph modelling of interleaved buck converters

Veerachary, Mummadi; Senjyu, Tomonobu; Uezato, K.

doi:10.1002/cta.230

Cited by 11 publications

(11 citation statements)

References 16 publications

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“…This practice also improves the distribution the thermal stress of the electronic switches, elevating so the power density without affecting efficiency. Also it allows a faster dynamic response due to the reduced input filter [6]. Section II presents a summary of advantages and disadvantages of the interleaved chopper converter in comparison with other topologies.…”

Section: Introductionmentioning

confidence: 99%

DC electronic load based on an interleaved chopper converter to determine photovoltaic panel and fuel cell biasing curves

Trapp

Lenz

Farret

et al. 2012

2012 10th IEEE/IAS International Conference on Industry Applications

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This paper presents the description of a DC electronic load based on an interleaved chopper converter to determine the biasing and dynamics characteristics of either fuel cells (FCs) and photovoltaic panels (PVs). Variable loads are used for experimental data acquisition of I-V power supply characteristics in a way that several operating points can be easily obtained. Laboratory load current tests using ordinary power resistors are not an easy solution due to their size, cost and overall weight. To resolve that it is proposed in this paper that the current through electronically varying loads can give better resolution to the I-V characteristics of FC and PV sources. The interleaved operation of the chopper converter ensures an input high frequency current ripple, reducing so the input LC filters size and converter volume. The converter transfer function is analyzed and controllers are designed to obtain a fast dynamic response and insure good stability in steady state operation. It is presented the converter operating principles, operating states and design. The simulated and results are compared to each other in order to prove the electronic load effectiveness in acquiring the I-V biasing curves of fuel cells and photovoltaic panels.

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Section: Introductionmentioning

confidence: 99%

DC electronic load based on an interleaved chopper converter to determine photovoltaic panel and fuel cell biasing curves

Trapp

Lenz

Farret

et al. 2012

2012 10th IEEE/IAS International Conference on Industry Applications

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“…We adapt a graphical loop-gain method to design the RFACBC scheme and analyze the closed-loop performances of the converter [22][23][24][25][26]. In addition, we establish design guidelines for voltage feedback compensation consisted of RFACBC and multistage EA, which can provide good closed-loop performances for high frequency low voltage buck DC-DC converters.…”

Section: Introductionmentioning

confidence: 99%

Robust feedforward compensation scheme with AC booster for high frequency low voltage buck DC–DC converters

Zhang

Shao

2011

Analog Integr Circ Sig Process

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Today and in the future, high frequency low voltage DC-DC converters are an effective power-management solution for fast transient response and small profile in portable electronic systems. This paper presents a robust feedforward compensation scheme with AC booster. An ac amplifier is added in parallel with the main path to compensate the high-frequency gain reduction, which improves gain-bandwidth (GBW) product and slew rate significantly. This approach takes the multistage error amplifier (EA) as an element in the compensation circuit instead of using passive elements used in traditional proportional-plus-integral-andderivative (PID) compensation circuits. The positive phase shift of left-half-phase (LHP) zeros caused by the feedforward path and ac boosting path in the multistage EA is used to cancel the negative phase shift by the resonant poles of the power stage of buck DC-DC converter in order to compensate the DC-DC converters. A graphical loop-gain method is used to design the feedback compensation and analyze the closed-loop performances of the converter for the complexion arising from the presence of multiple poles of EA before crossover frequency in high frequency converters. The high gain, wide bandwidth, and high slew rate are achieved by the absence of traditional pole-splitting effect and the added ac booster. In addition, the design guidelines for this feedback compensation network realized by robust feedforward with AC booster compensation (RFACBC) scheme and multistage EA are established. When the proposed compensation networks were employed in 100 MHz buck DC-DC converter implemented in SMIC 0.18 lm CMOS process, the simulation results validate the feasibility and functionality of the RFACBC scheme and design guidelines. The closed-loop dc gain achieves over 60 dB with over 20 MHz GBW and 61°phase margin under wide range loads. Furthermore, the settling time is improved due to the advanced frequency compensation.Keywords Error amplifiers (EA) Á Graphical loop-gain method Á High frequency DC-DC converters Á Low voltage Á Multistage amplifier Á Robust feedforward with AC booster compensation (RFACBC)

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“…Power converters have to be connected in parallel whenever power conversion is necessary at a higher value of current than what the devices can carry [1][2][3][4][5][6]. By paralleling converters, the inductor current in each phase is reduced, and hence the size of the inductor can be decreased [1,[7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Foldings and grazings of tori in current controlled interleaved boost converters

Giaouris

Banerjee

Stergiopoulos

et al. 2013

Circuit Theory & Apps

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SUMMARYInterleaved boost converters (IBCs) are used when energy conversion is required at high current levels. Such converter systems may undergo various nonlinear phenomena which can affect their performance adversely. In this paper, we study an IBC and demonstrate the first instability through a Neimark-Sacker bifurcation, resulting in a torus. An analysis based on the calculation of the monodromy matrix reveals that the torus has a rather strange form as the complex Floquet multipliers that became unstable have a real value close to À1. We show that further variation in a parameter can result in novel nonlinear phenomena where the torus itself folds and grazes a switching manifold, resulting in a 'wobbling' of the closed loop that represents the torus in discrete time. Numerical and analytical results validate our work.

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Signal flow graph modelling of interleaved buck converters

Cited by 11 publications

References 16 publications

DC electronic load based on an interleaved chopper converter to determine photovoltaic panel and fuel cell biasing curves

DC electronic load based on an interleaved chopper converter to determine photovoltaic panel and fuel cell biasing curves

Robust feedforward compensation scheme with AC booster for high frequency low voltage buck DC–DC converters

Foldings and grazings of tori in current controlled interleaved boost converters

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