Effects of Circuit Parameters on Dynamics of Current-Mode-Pulse-Train-Controlled Buck Converter

Sha, Jin; Xu, Jianping; Bao, Bocheng; Yan, Tie

doi:10.1109/tie.2013.2257145

Cited by 35 publications

(11 citation statements)

References 18 publications

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“…Comparing (17) with (20), all the parasitic parameters reflected into RLEST can be describe in (21). As shown in (21), RLEST derived from (17) includes not only RL, but also the effects of RDS, RD, and VD on inductor current estimation.…”

Section: Avmentioning

confidence: 99%

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Online Inductor Parameters Identification by Small-Signal Injection for Sensorless Predictive Current Controlled Boost Converter

Chen

Zhang

et al. 2017

IEEE Trans. Ind. Inf.

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Abstract-In a sensorless predictive current controlled boost converter, parameterizing the inductor plays an important role in controller performance. In this paper, a solution for inductor parameters online identification is investigated. A small signal injection strategy is proposed to create a transient state, and convergence problem of inductance identification in steady state can be avoided. Then a charge balance current observer (CBCO), derived from capacitor current charging balance concept, is adopted to estimate the inductor current for inductance identification. Since inductance is not used in CBCO, current estimation is not affected by inductance identification error. Because of rank-deficient problem, instead of identifying inductor parasitic resistance solely, the inductor equivalent parasitic resistance is derived. By applying it into the conventional current observer for current control loop, the accuracy of current estimation can still be guaranteed since more parasitic effects are included. To improve the accuracy of inductance identification, a load identification method is investigated. Furthermore, the effect of the equivalent series resistance (ESR) of output capacitor on the proposed algorithm is analyzed. Finally, its effectiveness is verified by experimental results.Index Terms-Sensorless, boost converter, inductor parameters, online identification, small signal injection.

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Section: Avmentioning

confidence: 99%

“…Substituting (21) into (13), the modified equation is equivalent to (20). This means that the estimated inductor current can be described as (20) after RL is replaced by RLEST. Compared with (13), the current estimation is more accurate because more parasitic effects are considered.…”

Section: Avmentioning

confidence: 99%

Online Inductor Parameters Identification by Small-Signal Injection for Sensorless Predictive Current Controlled Boost Converter

Chen

Zhang

et al. 2017

IEEE Trans. Ind. Inf.

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“…A bifurcation demonstrates a qualitative change in the properties of the system depending on these bifurcation parameters [7]. The bifurcation parameters can include load power [14][15][16], feedback gain [17,18], capacitance [18], load resistance [18,19], inductance [20], parasitic resistance of the inductor, switching frequency [21], gain controller [22,23], compensating ramp [23][24][25], series resistance of the capacitor [26], input voltage, current reference, and other factors. In this paper, the load power was considered as the bifurcation parameter.…”

Section: Introductionmentioning

confidence: 99%

Active stabilisation design of DC–DC converters with constant power load using a sampled discrete‐time model: stability analysis and experimental verification

Gavagsaz-Ghoachani

Saublet

Phattanasak

et al. 2018

IET Power Electronics

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Instabilities of cascade converters with an LC filter in between in power electronic systems have been known, and many answers have been proposed. The load converters are tightly regulated, acting as constant power loads (CPLs). Average models are generally utilised to study the behavior of the converters. For embedded applications, the weight and the volume should be reduced. Consequently, in this case, the limitations of the average method are reached when the cutoff frequency of the LC input filter is close to the switching frequency. Then, other tools are necessary to study this type of system. To overcome this problem, a discrete-time model was developed to study the behavior of the system, taking into account the switching effect. The aim was to enlarge the power range of the stability zone for a DC system composed of a DC-DC boost converter as a source converter, which was connected to the power load via an LC input filter. For this purpose, a stabilisation expression is integrated in the command of the source converter. The stability analysis by the eigenvalues of the system is described using the proposed model. Simulation and experimental results are discussed to verify the proposed stabiliser in different cases.

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“…Pulse train (PT) control can achieve the output voltage regulation by using the combination of two or more preset pulses [4][5][6]. As compared with pulse width modulation (PWM) technology, PT control has the advantages of simple structure, low cost and fast dynamic response [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Since the energy variation of the inductor during one switching cycle is zero, the input energy will be completely delivered to the load side via the inductor. Therefore, the output voltage can be timely regulated by the control pulses, while the output voltage will be increased by high-power pulses and decreased by low-power pulses [7][8][9][10]. PT control is also attempted to be used in converters operated in continuous conduction mode (CCM).…”

Section: Introductionmentioning

confidence: 99%

Pulse train controlled buck converter with coupled inductors

Wang

Geng

et al. 2017

IET Power Electronics

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Pulse train (PT) controlled switching DC/DC converters possess advantages of simple structure, fast dynamic response, good robustness etc. but also accompanied by undesirable low-frequency oscillation phenomenon when the converters are operated in continuous conduction mode (CCM). To mitigate the low-frequency oscillations of PT controlled buck converters, a novel buck converter with coupled inductor is proposed in this paper. Firstly, the mechanism of the low-frequency oscillation is analysed, the corresponding oscillation suppression method is discussed and the discrete-time model of the proposed converter is constructed. Furthermore, the bifurcation and time-domain diagrams of the output voltage and the switching peak current in terms of coupling coefficient and load variation are reported, and the influence from the coupling coefficient and load on low-frequency oscillation behaviours is revealed. The experimental results verify that the output voltage of the PT controlled proposed buck converter can be timely adjusted based on proper configuration of the coupling coefficient, and hence the low-frequency oscillation can be eliminated and the maximum switching peak current can be decreased.

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Effects of Circuit Parameters on Dynamics of Current-Mode-Pulse-Train-Controlled Buck Converter

Cited by 35 publications

References 18 publications

Online Inductor Parameters Identification by Small-Signal Injection for Sensorless Predictive Current Controlled Boost Converter

Online Inductor Parameters Identification by Small-Signal Injection for Sensorless Predictive Current Controlled Boost Converter

Active stabilisation design of DC–DC converters with constant power load using a sampled discrete‐time model: stability analysis and experimental verification

Pulse train controlled buck converter with coupled inductors

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