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A Study on Loop Gain Measurement Method Using Output Impedance in DC-DC Buck Converter

Nobukazu TSUKIJI, Yasunori KOBORI, Haruo KOBAYASHI

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Summary :

We propose a method to derive the loop gain from the open-loop and closed-loop output impedances in a dc-dc buck converter with voltage mode and current mode controls. This enables the loop gain to be measured without injecting a signal into the feedback loop, i.e. without breaking the feedback loop; hence the proposed method can be applied to the control circuits implemented on an IC. Our simulation and experiment show that the loop gain determined by the proposed method closely matches that yielded by the conventional method, which has to break the feedback loop. These results confirm that the proposed method can accurately estimate the phase margin.

Publication
IEICE TRANSACTIONS on Communications Vol.E101-B No.9 pp.1940-1948
Publication Date
2018/09/01
Publicized
2018/02/23
Online ISSN
1745-1345
DOI
10.1587/transcom.2017EBP3358
Type of Manuscript
PAPER
Category
Energy in Electronics Communications

Authors

Nobukazu TSUKIJI
  Gunma University
Yasunori KOBORI
  Gunma University
Haruo KOBAYASHI
  Gunma University

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