Hybrid Digital Adaptive Control for Fast Transient Response in Synchronous Buck DC-DC Converters

This paper presents a hybrid digital adaptive (HDA) control for fast step-load transient responses in synchronous buck DC-DC converters. The proposed HDA controller results in near-time-optimal step-load transient responses even when the output voltage is sampled using a relatively low-resolution, n...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2009-11, Vol.24 (11), p.2625-2638
Main Authors: Babazadeh, A., Maksimovic, D.
Format: Article
Language:English
Subjects:
Adaptive control
Control surfaces
Controllers
Converters
DC-DC power converters
DC-DC switched-mode power converters
Digital
Digital control
Electric currents
Electric power
Electrical equipment
Inductors
Programmable control
Pulse duration modulation
Pulse width modulation
Space vector pulse width modulation
Steady-state
Switching
switching surface control
Synchronous
time-optimal control
Transient response
Transient responses
Voltage control
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Summary:This paper presents a hybrid digital adaptive (HDA) control for fast step-load transient responses in synchronous buck DC-DC converters. The proposed HDA controller results in near-time-optimal step-load transient responses even when the output voltage is sampled using a relatively low-resolution, narrow-range window A/D converter. The controller is a combination of a standard constant-frequency pulsewidth-modulated (PWM) control in the vicinity of steady-state operating point and a bank of switching surface controllers (SSCs) away from the reference. The switching surface slope is adaptively selected by a supervisor based on an inductor current estimate. Furthermore, the controller is capable of taking into account a maximum inductor current limitation. A large-signal stability analysis is presented for all possible cases during transients when one of the SSCs is active. Experimental results demonstrate fast transient responses for a 1.3 V, 10 A synchronous buck converter over a wide range of step-load transients.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2009.2033065