Journal ArticleDOI
New Modeling Approach and Equivalent Circuit Representation for Current-Mode Control
Jian Li,Fred C. Lee +1 more
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TLDR
In this paper, the authors proposed a model for constant on-time current-mode control, where the inductor, switches, and modulator are treated as a single entity and modeled based on the describing function method.Abstract:
Constant on-time current-mode control has been widely used to improve light-load efficiency, because it can reduce the switching frequency to save switching-related loss. Therefore, an accurate model for constant on-time control is indispensable to system design. However, available models for constant on-time control are unable to provide accurate physical insight or predict system response very well. This paper introduces a new modeling approach for constant on-time control. The inductor, the switches, and the pulsewidth-modulated modulator are treated as a single entity and modeled based on the describing function method. The fundamental difference between constant on-time control and constant-frequency peak-current-mode control is analyzed through the proposed model. This proposed modeling method can be easily extended to other current-mode controls, including V2 controls. A simple equivalent circuit representation is proposed for the sake of easy understanding and simulation of current-mode controls. Simulation and experimental results are used to verify the proposed model.read more
Citations
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Microcontroller-Based Peak Current Mode Control Using Digital Slope Compensation
TL;DR: In this article, a discrete time controller with digital slope compensation was proposed to achieve peak current mode control of a buck converter using only a single-chip microcontroller to achieve desirable cycle-by-cycle peak current limiting.
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A Ripple-Based Constant On-Time Control With Virtual Inductor Current and Offset Cancellation for DC Power Converters
TL;DR: In this paper, a modified ripple-based constant on-time (RBCOT) buck converter circuit is proposed to solve the output-voltage offset problem and subharmonic instability problem.
Journal ArticleDOI
Comparison of Small Signal Characteristics in Current Mode Control Schemes for Point-of-Load Buck Converter Applications
TL;DR: In this article, the authors investigated and compared four current mode control schemes (peak-current control, valley current control, constant on-time control, and constant off-time controller) for point-of-load (POL) converter applications.
Journal ArticleDOI
A Simplified Equivalent Circuit Model of Series Resonant Converter
TL;DR: In this paper, a simple third-order equivalent circuit model of series resonant converter (SRC) was proposed, based on the fact that the resonant capacitor behaves like an equivalent resonant inductor with respect to the modulation frequency.
Journal ArticleDOI
Simplified Averaged Models of DC–DC Power Converters Suitable for Controller Design and Microgrid Simulation
TL;DR: In this article, the authors presented simplified nonlinear averaged large-signal and linear small signal models of the three basic dc-dc converter topologies, boost, buck, and noninverting buck-boost, respectively, operating in peak current-mode control.
References
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A new, continuous-time model for current-mode control (power convertors)
TL;DR: In this paper, a current-mode control power convertor model that is accurate at frequencies from DC to half the switching frequency is described for constant-frequency operation, using a simple pole-zero transfer function, which is able to predict subharmonic oscillation without the need for discrete-time z-transform models.
Average current mode control of switching power supplies
TL;DR: Average current mode control may be used effectively to control currents other than inductor current, allowing a much broader range of topological application.
Journal ArticleDOI
Topics in Multiple-Loop Regulators and Current-Mode Programming
TL;DR: In this paper, a model of the current feedback path is derived which augments the well-known power stage canonical circuit model, and it is concluded that incorporation of a current-programmed power stage into a ''new'' power stage model is both justified and useful.
Proceedings ArticleDOI
Simple switching control method changes power converter into a current source
TL;DR: In this paper, a switching converter with an LC output filter behaves as a loose-tolerance voltage-controlled current source if each switch closure is ended when switch current reaches an adjustable threshold.
Journal ArticleDOI
Modeling current-programmed buck and boost regulators
TL;DR: In this paper, a general small-signal model for current-programmed switching power stages is used for design-oriented analysis of a 150 W buck regulator and a 280 W boost regulator.