Modeling of input dynamics of telecom load

Suntio, Teuvo; Gadoura, I.; Lempinen, J.; Zenger, Kai

doi:10.1109/telesc.2000.918437

Cited by 3 publications

(6 citation statements)

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“…The theoretical formulation was based on the use of a two-port model [34] derived using Norton's and Thevenin's equivalent circuits [35] and on the new small-signal modeling proposed in [21]. The input dynamics have not been widely studied earlier, except in [32] and [33]. It is characterized using input admittance and output current susceptibility, which seem to be well behaved without an input filter due to the real and well-separated poles of the converter transfer functions.…”

Section: Discussionmentioning

confidence: 99%

“…The effect of these elements can be extracted from the model using circuit theory. When a converter operates in CICM [32], the state-space averaging technique [2], [30] can be effectively used to obtain the necessary transfer functions under VM control. These transfer functions can be used to obtain the proper transfer functions describing the dynamics imposed by, e.g., PCM control.…”

Section: Input and Output Port Small-signal Modelingmentioning

confidence: 99%

“…The resulting input filter is, however, a second-order filter because of the effect of the distributed inductance of the input wiring or printed circuit board (PCB) traces. This may result in unexpected behavior [32]. The Telecom ETSI specifications [37] state that the equivalent circuit of the input source consists of an inductor ( ) and a loss resistor ( ).…”

Section: A Small-signal Models For Input Dynamicsmentioning

confidence: 99%

“…The optimal compensation makes a buck converter insensitive to the changes in the input (i.e., intermediate) voltage also in the large-signal sense [21]. The optimal compensation affects also the behavior of the converter input impedance [32], [33] discussed more in detail in Section III.…”

Section: A Small-signal Models For Input Dynamicsmentioning

confidence: 99%

“…If compensation is not used, its attenuation capability is significantly dependent on the amount and type of load [38]. This is because the attenuation results partly from the effect of the term ( ) and mainly from the effect of the lossless resistor (32), which is in series with the output inductor (i.e.,…”

Section: Small-signal Models For a Buck Convertermentioning

confidence: 99%

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Input filter interactions in peak-current-mode-controlled buck converter operating in CICM

Suntio

Gadoura²,

Zenger³

2002

IEEE Trans. Ind. Electron.

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Peak-current-mode (PCM) control is a widely used method to control switched-mode converters. Most often an input filter is necessary to meet electromagnetic interference requirements. The input filter can cause instability and degradation of input and output dynamics if not properly designed. The input filter design from the output dynamics viewpoint has been addressed in numerous papers, resulting in well-agreed results in the case of direct duty-ratio control. The same methods and criteria have also been applied to PCM control, but the results have turned out to be conflicting. This paper shows that the adverse effect of the input filter on the output performance of a peak-current-controlled buck converter in continuous inductor-current mode is insignificant. The input performance is, however, significantly affected, necessitating the use of proper damping. It is also shown that the instability is caused solely by the instability of the input filter under negative incremental resistance. The methods used are unified in nature, but the results obtained in this study cannot be generalized to be valid for types of converters other than a buck converter.Index Terms-Buck converter, continuous inductor current mode, input filter, input and output dynamics, peak-current-mode control.

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Section: Discussionmentioning

confidence: 99%