TY - GEN
T1 - Low-volume buck converter with adaptive inductor core biasing
AU - Ahsanuzzaman, S. M.
AU - McRae, Timothy
AU - Peretz, Mor M.
AU - Prodić, Aleksandar
PY - 2012/4/30
Y1 - 2012/4/30
N2 - This paper introduces a digitally-controlled buck converter with adaptive core biasing that allows for minimization of the output capacitor as well as of the inductor core. The improved performances are obtained through adaptive relocation of the converter operating point on the B-H curve of the inductor core, with the help of a digitally controlled low-power biasing circuit and an extra inductor winding. During transients, the point is set in the saturation region, so the inductance is drastically reduced. As a result the inductor current slew rate and, consequently, load transient response are improved allowing output capacitor reduction. The biasing is also used to reduce flux density allowing the core volume minimization. Experimental verifications with a 3.3 V, 30 W, 500 kHz prototype show that the adaptive biasing system has about two times smaller voltage deviation than the conventional buck allowing for proportional reduction in the output capacitance and for about 40% reduction in the magnetic core size.
AB - This paper introduces a digitally-controlled buck converter with adaptive core biasing that allows for minimization of the output capacitor as well as of the inductor core. The improved performances are obtained through adaptive relocation of the converter operating point on the B-H curve of the inductor core, with the help of a digitally controlled low-power biasing circuit and an extra inductor winding. During transients, the point is set in the saturation region, so the inductance is drastically reduced. As a result the inductor current slew rate and, consequently, load transient response are improved allowing output capacitor reduction. The biasing is also used to reduce flux density allowing the core volume minimization. Experimental verifications with a 3.3 V, 30 W, 500 kHz prototype show that the adaptive biasing system has about two times smaller voltage deviation than the conventional buck allowing for proportional reduction in the output capacitance and for about 40% reduction in the magnetic core size.
UR - http://www.scopus.com/inward/record.url?scp=84860141160&partnerID=8YFLogxK
U2 - 10.1109/APEC.2012.6165840
DO - 10.1109/APEC.2012.6165840
M3 - Conference contribution
AN - SCOPUS:84860141160
SN - 9781457712159
T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
SP - 335
EP - 339
BT - APEC 2012 - 27th Annual IEEE Applied Power Electronics Conference and Exposition
T2 - 27th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2012
Y2 - 5 February 2012 through 9 February 2012
ER -