TY - GEN
T1 - Closed-loop design and time-optimal control for a series-capacitor buck converter
AU - Vekslender, Timur
AU - Ezra, Ofer
AU - Bezdenezhnykh, Yevgeny
AU - Peretz, Mor Mordechai
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/5/10
Y1 - 2016/5/10
N2 - This paper explores the large-signal and smallsignal dynamics of a series-capacitor (SC) buck-type converter and introduces an optimal closed-loop control scheme to accommodate both the steady-state and transient modes. As opposed to a conventional buck converter, where time-optimal control is realized by a single on-off cycle, in the SC-buck topology there is a need to distribute the switching phases to satisfy the charge-balance of the flying capacitor. The new control method hybrids a voltage-mode small-signal controller for steady-state operation and a non-linear, state-plane based transient-mode control scheme for load transients. A detailed principle of operation of the SC-buck converter is provided and explained through an average behavioral model and state-plane analysis. The operation of the controller is experimentally verified on a 12W 12V-to-1.5V converter, demonstrating voltage-mode control operation as well as time-optimal response for load transients.
AB - This paper explores the large-signal and smallsignal dynamics of a series-capacitor (SC) buck-type converter and introduces an optimal closed-loop control scheme to accommodate both the steady-state and transient modes. As opposed to a conventional buck converter, where time-optimal control is realized by a single on-off cycle, in the SC-buck topology there is a need to distribute the switching phases to satisfy the charge-balance of the flying capacitor. The new control method hybrids a voltage-mode small-signal controller for steady-state operation and a non-linear, state-plane based transient-mode control scheme for load transients. A detailed principle of operation of the SC-buck converter is provided and explained through an average behavioral model and state-plane analysis. The operation of the controller is experimentally verified on a 12W 12V-to-1.5V converter, demonstrating voltage-mode control operation as well as time-optimal response for load transients.
KW - Time-optimal control
KW - dc-dc converters
KW - state-space control
KW - voltage regulation
UR - https://www.scopus.com/pages/publications/84973635802
U2 - 10.1109/APEC.2016.7467889
DO - 10.1109/APEC.2016.7467889
M3 - Conference contribution
AN - SCOPUS:84973635802
T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
SP - 308
EP - 314
BT - 2016 IEEE Applied Power Electronics Conference and Exposition, APEC 2016
PB - Institute of Electrical and Electronics Engineers
T2 - 31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016
Y2 - 20 March 2016 through 24 March 2016
ER -