Physical insight into the factors affecting the load-transient response of a buck converter

Suntio, Teuvo; Kivimäki, Jyri

doi:10.1109/epe.2014.6910688

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…Equation (27) shows that the load-resistor-affected low-frequency pole moves into RHP, when M > 2/3, which complies with the instability condition predicted by Equation 12in Section 2.1. The high-frequency pole equals the high-frequency pole in (24) and stays an LHP pole.…”

Section: Small-signal Models Of Pcm-controlled Buck Converter In Dcmsupporting

confidence: 77%

“…The reason for this is that the load resistor affects the location of the poles as is visible in the load-resistor-affected poles given in (27) as well as in Table 1 (i.e., two right most columns) [17]. The investigations of this paper show that the load-resistor-affected RHP pole appears in vicinity of M = 2/3 as discussed in [10][11][12][13][14] and derived explicitly in Section 2.1 (Equation (12)) and in (27). The power-stage losses will shift the appearance of the instability into an operating point, where M < 2/3 as clearly visible in Table 1.…”

Section: Small-signal Models Of Pcm-controlled Buck Converter In Dcmmentioning

confidence: 99%

“…As stated earlier, the applied Simulink models for a buck converter are explicitly given in [27]. The principles of the frequency-response-measuring method is described in [22,23].…”

Section: Simulink-based Model Validationmentioning

confidence: 99%

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Dynamic Modeling and Analysis of PCM-Controlled DCM-Operating Buck Converters—A Reexamination

Suntio

2018

Energies

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Peak-current-mode (PCM) control was proposed in 1978. The observed peculiar behavior caused by the application of PCM-control in the behavior of a switched-mode converter, which operates in continuous conduction mode (CCM), has led to a multitude of attempts to capture the dynamics associated to it. Only a few similar models have been published for a PCM-controlled converter, which operates in discontinuous conduction mode (DCM). PCM modeling is actually an extension of the modeling of direct-duty-ratio (DDR) or voltage-mode (VM) control, where the perturbed duty ratio is replaced by proper duty-ratio constraints. The modeling technique, which produces accurate PCM models in DCM, is developed in early 2000s. The given small-signal models are, however, load-resistor affected, which hides the real dynamic behavior of the associated converter. The objectives of this paper are as follows: (i) proving the accuracy of the modeling method published in 2001, (ii) performing a comprehensive dynamic analysis in order to reveal the real dynamics of the buck converter under PCM control in DCM, (iii) providing a method to improve the high-frequency accuracy of the small-signal models, and (iv) developing control-engineering-type block diagrams to facilitate the development of generalized transfer functions, which are applicable for PCM-controlled DCM-operated buck, boost, and buck-boost converters.

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Section: Small-signal Models Of Pcm-controlled Buck Converter In Dcmsupporting

confidence: 77%