Journal of Power Electronics

  • 제16권6호
  • /
  • Pages.2045-2056
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  • 2016
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  • 1598-2092(pISSN)
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  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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Input Impedances of PWM DC-DC Converters: Unified Analysis and Application Example

  • 투고 : 2016.05.12
  • 심사 : 2016.08.12
  • 발행 : 2016.11.20
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초록

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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참고문헌

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피인용 문헌

  1. Stabilizing Effects of Load Subsystem in Multistage DC-to-DC Power Conversion Systems vol.5, pp.4, 2017, https://doi.org/10.1109/JESTPE.2017.2707093