NDLI: Analysis and Design of Average Current Mode Control Using a Describing-Function-Based Equivalent Circuit Model

Content Provider	IEEE Xplore Digital Library
Author	F. C.
Copyright Year	1986
Abstract	This paper proposes a small-signal model for average current mode control based on an equivalent circuit. The model uses a three-terminal equivalent circuit model based on a linearized describing function method to include the feedback effect of the sideband frequency components of the inductor current. The model extends the results obtained in peak current mode control to average current mode control. The proposed small-signal model is accurate up to half switching frequency, predicting the subharmonic instability. The proposed model is verified using SIMPLIS simulation and hardware experiments, which show good agreement with the measurement results. Based on the proposed model, new feedback design guidelines are presented. The proposed design guidelines are compared with several conventional, widely used design criteria. By designing the external ramp following the proposed design guidelines, the quality factor of the double poles at half of the switching frequency in the control-to-output transfer function can be precisely controlled. This helps the feedback loop design to achieve wide control bandwidth and proper damping.
Sponsorship	IEEE Power Electronics Society
Starting Page	4732
Ending Page	4741
Page Count	10
File Size	1387478
File Format	PDF
ISSN	08858993
Volume Number	28
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Integrated circuit modeling Transfer functions Equivalent circuits Switching frequency Control systems Load modeling Predictive models modeling Average current mode control design guideline equivalent circuit
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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