One-cycle-averaging for digital PWM control system design

Pulse-width modulation (PWM) is a widely used strategy for operating switch controlled systems. A model for PWM systems is reported which provides the discrete-time response of the one-cycle-average value of any signal in the system. The model typically has unstable zero dynamics, as well as a nonli...

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Bibliographic Details
Main Authors: Al-Numay, M.S., Taylor, D.G.
Format: Conference Proceeding
Language:English
Subjects:
Control systems
Digital control
Digital modulation
Nonlinear dynamical systems
Phase modulation
Power system modeling
Pulse width modulation
Pulse width modulation converters
Stability
Switches
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Description
Summary:Pulse-width modulation (PWM) is a widely used strategy for operating switch controlled systems. A model for PWM systems is reported which provides the discrete-time response of the one-cycle-average value of any signal in the system. The model typically has unstable zero dynamics, as well as a nonlinear dependence on the duty ratio input. Using scheduled output redefinition, an approximate design model is derived which has stable zero dynamics. A controller based on discrete-time input-output linearization is then developed using this approximate design model. Although this approach leads to approximate rather than perfect output tracking, it guarantees internal stability.
ISSN:0743-1619
2378-5861
DOI:10.1109/ACC.2000.876662