Peak-current-mode-controlled buck converter with positive feedforward control

The closed-loop control stability of a switching converter can be compromised when the source voltage is not an ideal voltage source, but presents finite Theacutevenin impedance. This phenomenon is called source subsystem interaction. As an active approach to improve the stability degraded by the so...

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Bibliographic Details
Main Authors: Cho, H.Y., Santi, E.
Format: Conference Proceeding
Language:English
Subjects:
Adaptive control
Buck converters
constant power load
Control systems
Degradation
Frequency
Impedance
negative input impedance
Output feedback
positive feedforward control
Stability
stability g-parameter representation
subsystem interaction
Switching converters
Unified impedance criterion
Voltage control
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Summary:The closed-loop control stability of a switching converter can be compromised when the source voltage is not an ideal voltage source, but presents finite Theacutevenin impedance. This phenomenon is called source subsystem interaction. As an active approach to improve the stability degraded by the source subsystem interaction, the positive feedforward (PFF) control is proposed for the peak-current-mode-controlled buck converter. PFF control stabilizes the input port in the frequency range where the source subsystem interaction affects system stability, while allowing the feedback controller to maintain tight output voltage regulation at lower frequencies. The approach results in greatly improved stability with a slight reduction of output feedback control bandwidth. Small-signal models are developed based on g-parameter representation. The design technique of the positive feedforward controller is discussed. Also, the total system stability is analyzed based on the unified impedance criterion. This approach is validated by simulation.
ISSN:2329-3721
2329-3748
DOI:10.1109/ECCE.2009.5316267