Subharmonic Instability Limits for the Peak-Current-Controlled Buck Converter With Closed Voltage Feedback Loop

Fang, Chung-Chieh; Redl, R.

doi:10.1109/tpel.2014.2312354

Cited by 29 publications

(25 citation statements)

References 17 publications

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“…The control method used for the proposed structure is the peak current‐mode control, which is a widely used technique for the control of power converters . The purpose of the proposed control method that is shown in Figure is reaching the high step‐up gain without a high duty ratio.…”

Section: Design Considerationsmentioning

confidence: 99%

A novel structure for high step‐up DC‐DC converter with flexibility under the variable loads for EV solar charging system

Eskandarian

Harchegani

Kazemi

2020

Int Trans Electr Energ Syst

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Summary Recently, with the development of electric vehicles (EVs), in order to compensate for the undesirable effects of charging stations on grid characteristics, paying attention to the local generators based on renewable energy has increased and has caused to develop of the peripheral systems. In this paper, a high step‐up multistage structure consisting of several integrated boost flyback converter (IBFC) has been proposed. In the combination of these stages, the boost subconverters are interleaved in order to charge the battery bank and are in series with the flyback subconverters in order to supply the variable loads. The proposed structure has advantages, such as applicability in high voltage step‐up cases, enhanced reliability in photovoltaic system, and flexibility against variable power consumption. In addition, this structure at the no‐load condition has the ability to charge the battery system with proper voltage and supply several vehicles simultaneously without any voltage drop. Furthermore, the energy stored in leakage inductor can be recycled instead of damping with passive snubbers, resulting in high conversion efficiency and simple circuit structure with fewer components. The performance of proposed structure is analyzed in detail at no‐load, loading, and input power outage conditions. Then, the proposed converter with solar panel input power in order to supply the EV charging system is simulated in Matlab/Simulink to verify the analytical results. Finally, a three‐stage prototype (17.3–240 V) with 60 W solar panel input has been developed, which validates the feasibility and the effectiveness of the proposed topology using variable loads (180, 360, 720 W).

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Section: Design Considerationsmentioning

confidence: 99%

A novel structure for high step‐up DC‐DC converter with flexibility under the variable loads for EV solar charging system

Eskandarian

Harchegani

Kazemi

2020

Int Trans Electr Energ Syst

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“…The first term comes from vc(fm), the second from vc(fm-fs), and the third from vc(fs+fm). So, the three modulation function FM11, FM12, and FM13 can be found by (19) to (21 …”

Section: ) Finding the Describing Functions For Fm11 Fm12 And Fm13mentioning

confidence: 99%

“…8. It only affects the magnitude of each FM function as shown by the Vpp,fs term in (19) to (21). From Fig.6, the overall open loop gain is defined by the ratio of vo(fm) to the voltage vp(fm) at the point R. Equation (22) shows the relationship.…”

Section: B the Effect Of Fs Component On The Transfer Functionmentioning

confidence: 99%

“…Average model has been used for many years in other applications [11]- [17], but it is accurate only for a design with low bandwidth/switching frequency ratio. There are other approaches [18]- [19] intending to deal with the same issue but are generally deviating from small-signal concept and hard to use for engineers. To increase the model accuracy for a high-ratio application, a two-frequency model was proposed and verified in [20].…”

Section: Introductionmentioning

confidence: 99%

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A New Multiple-Frequency Small-Signal Model for High-Bandwidth Computer V-Core Regulator Applications

Hsiao

Chen

et al. 2016

IEEE Trans. Power Electron.

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A new multi-frequency small-signal control model for high-bandwidth DC buck regulator is proposed. Describing function approach is taken to model the duty-cycle modulator, incorporating the effects of not only the modulating frequency fm, the switching frequency fs, and the two sideband frequencies fs-fm and fs+fm. This model is significantly more accurate than the conventional average model and the recently proposed two-frequency model for applications with high control bandwidth-to-switching frequency ratio and high input-to-output voltage step down ratio, such as the v-core voltage regulators. The model is verified by simulations and experiments.

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“…1), a stable steady-state orbit and a bifurcated one coalesce [7]. This characteristic has been used to predict instabilities of dc-dc converters in CSP [8] or COT [9], with feedback filters [10], peak current control [11], average current control [12], or I 2 control [13]. Each scheme has its own instability condition.…”

Section: Introductionmentioning

confidence: 99%

Subharmonic Instability Limits for <inline-formula><tex-math>${\rm V}^2$</tex-math></inline-formula> -Controlled Buck Converter With Outer Loop Closed/Open

Fang

Chen

2016

IEEE Trans. Power Electron.

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General closed-form subharmonic oscillation conditions are obtained for V 2 -controlled buck converters. Both constant switching period and constant on-time operations are analyzed with the outer voltage loop closed or open. Once an arbitrary linear feedback is given, the associated closed-form stability condition of the converter is readily obtained. Past research results based on the describing function technique and the Floquet theory become special cases. This paper provides an alternative and easier method to analyze subharmonic instability.

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Subharmonic Instability Limits for the Peak-Current-Controlled Buck Converter With Closed Voltage Feedback Loop

Cited by 29 publications

References 17 publications

A novel structure for high step‐up DC‐DC converter with flexibility under the variable loads for EV solar charging system

A novel structure for high step‐up DC‐DC converter with flexibility under the variable loads for EV solar charging system

A New Multiple-Frequency Small-Signal Model for High-Bandwidth Computer V-Core Regulator Applications

Subharmonic Instability Limits for <inline-formula><tex-math>${\rm V}^2$</tex-math></inline-formula> -Controlled Buck Converter With Outer Loop Closed/Open

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