A systematic graphing technique for small-signal low-frequencycharacterization of PWM DC/DC converters
Wong, B.K.H.; Shu-Hung Chung, H.
Industrial Electronics, IEEE Transactions on
Volume 47, Issue 1, Feb 2000 Page(s):45 - 54
Digital Object Identifier 10.1109/41.824108
Summary:This paper presents a systematic graphing technique for the
small-signal low-frequency characterization of pulsewidth-modulated
(PWM) DC/DC power converters. The methodology starts with using a
discrete-time state-space description to formulate a small-signal
sensitivity graph for each circuit topology. Each graph correlates
state-variable sensitivities with the topology duration, input source
and state vector at the beginning of the topology. The overall converter
sensitivities in one switching cycle are obtained by cascading the
respective graphs in accordance with the sequence of the topologies. As
the proposed method integrates with original algorithms for obtaining
the time-domain responses and the steady-state operating point of
converters, it is unnecessary to have a priori understanding of the
converter operation and is possible to obtain actual circuit waveforms
within one switching cycle. The proposed method is exemplified by
analyzing a PWM boost converter operating in continuous conduction mode
and discontinuous conduction mode under open-loop and closed-loop
control, respectively. Theoretical predictions are verified with
experimental measurements
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