Adaptive feedforward and feedback control schemes for sliding mode controlled power converters

A major disadvantage of applying sliding mode control to dc/dc converters is that the steady-state switching frequency is affected by line and load variations. This is undesirable as it complicates the design of the input and output filters. To reduce switching frequency deviation in the events of l...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2006-01, Vol.21 (1), p.182-192
Main Authors: Siew-Chong Tan, Lai, Y.M., Tse, C.K., Cheung, M.K.H.
Format: Article
Language:English
Subjects:
Adaptive control
Adaptive control systems
Adaptive feedback control
adaptive feedforward control
Applied sciences
buck converter
DC-DC power converters
Direct current
Electric power
Electrical engineering. Electrical power engineering
Electronics
Exact sciences and technology
Feedback control
Feedback control systems
Feedforward
Filters
Frequencies
hysteresis modulation
Load management
Power electronics, power supplies
Programmable control
pulse-width-modulation (PWM)
sliding mode (SM)control
Sliding mode control
Steady-state
Switching
Switching frequency
Voltage control
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Summary:A major disadvantage of applying sliding mode control to dc/dc converters is that the steady-state switching frequency is affected by line and load variations. This is undesirable as it complicates the design of the input and output filters. To reduce switching frequency deviation in the events of line and load variations, an adaptive feedforward control scheme that varies the hysteresis band according to the change of line input voltage and an adaptive feedback control scheme that varies the control parameter (i.e., sliding coefficient) according to the change of the output load are proposed. This paper presents a thorough investigation into the problem and the effectiveness of the proposed solutions. In addition, methods of implementing the proposed adaptive control strategies are discussed. Experimental results confirm that the adaptive control schemes are capable of reducing the switching frequency variations caused by both line and load variations.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2005.861191