Unified Control of a Buck Converter for Wide-Load-Range Applications

A new discrete-time state feedback controller is presented, which allows high-bandwidth voltage control of a buck converter for any load condition, whether it operates in discontinuous conduction mode (DCM), continuous conduction mode (CCM), or at the boundary of these regions. This makes the buck c...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2015-09, Vol.51 (5), p.4061-4071
Main Authors: van der Broeck, Christoph H., De Doncker, Rik W., Richter, Sebastian A., Bloh, Jochen von
Format: Article
Language:English
Subjects:
Appliance industry
Buck converter control
CCM
control synthesis
Controllers
converter modeling discrete time control
DCM
Electronic switching systems
Inductors
Load modeling
Mathematical model
Observers
Power supply
Pulse width modulation
Regulators
Voltage control
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Summary:A new discrete-time state feedback controller is presented, which allows high-bandwidth voltage control of a buck converter for any load condition, whether it operates in discontinuous conduction mode (DCM), continuous conduction mode (CCM), or at the boundary of these regions. This makes the buck converter applicable for a wide range of applications. For the control design process, two large-signal models, which represent the buck converter's discrete time dynamics in CCM and DCM, are developed. A simple proportional-integral regulator is used for the voltage control of the converter. The operation mode is detected and the voltage controller is connected in cascade to a current controller in CCM or to a nonlinear state feedback decoupling structure in DCM. In this paper, the modeling and design of the proposed control topology are introduced and its performance is demonstrated in simulation and experiment.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2015.2431994