Input Impedances of PWM DC-DC Converters: Unified Analysis and Application Example

Syam Kumar Pidaparthy; Byungcho Choi

Input Impedances of PWM DC-DC Converters: Unified Analysis and Application Example

Syam Kumar Pidaparthy

Byungcho Choi

Vol. 16, No. 6, pp. 2045-2056, Nov. 2016

10.6113/JPE.2016.16.6.2045

Current mode control

Dynamic interaction

Input impedances

Middlebrook's extra element theorem

Middlebrook's feedback theorem

Pulse width modulated dc-to-dc converters

Voltage mode control

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Abstract

The input impedances of pulse width modulated (PWM) dc-to-dc converters, which dictate the outcomes of the dynamic interaction between dc-to-dc converters and their source subsystem, are analyzed in a general and unified manner. The input impedances of three basic PWM dc-to-dc converters are derived with both voltage mode control and current mode control. This paper presents the analytical expressions of the 24 input impedances of three basic PWM dc-to-dc converters with the two different control schemes in a factorized time-constant form. It also provides a comprehensive reference for future dynamic interaction analyses requiring knowledge of the converters’ input impedances. The theoretical predictions of the paper are all supported by measurements on prototype dc-to-dc converters. The use of the presented results is demonstrated via a practical application example, which analyzes the small-signal dynamics of an input-filter coupled current-mode controlled buck converter. This elucidates the theoretical background for the previously-reported eccentric behavior of the converter.

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Cite this article

[IEEE Style]

S. K. Pidaparthy and B. Choi, "Input Impedances of PWM DC-DC Converters: Unified Analysis and Application Example," Journal of Power Electronics, vol. 16, no. 6, pp. 2045-2056, 2016. DOI: 10.6113/JPE.2016.16.6.2045.

[ACM Style]

Syam Kumar Pidaparthy and Byungcho Choi. 2016. Input Impedances of PWM DC-DC Converters: Unified Analysis and Application Example. Journal of Power Electronics, 16, 6, (2016), 2045-2056. DOI: 10.6113/JPE.2016.16.6.2045.