Title :
Coupled-inductor design optimization for fast-response low-voltage DC-DC converters
Author :
Li, Jieli ; Sullivan, Charles R. ; Schultz, Aaron
Author_Institution :
Thayer Sch. of Eng., Dartmouth Coll., Hanover, NH, USA
Abstract :
Multiphase voltage regulator modules (VRMs) for microprocessor power delivery with coupled output inductors are discussed. Strong coupling is shown to be feasible and effective at reducing ripple if the correct magnetic topology is used. For more than two phases, this can be a "ladder" core with windings around each rung. Typical ripple reduction is better than a factor of six with no effect on response time. One can also chose to improve response time while still significantly reducing ripple. A simultaneous numerical optimization of the magnetics and the circuit is used to minimize loss in a fast-response 100 A design
Keywords :
DC-DC power convertors; inductors; magnetic cores; voltage control; voltage regulators; 100 A; coupled output inductors; fast-response low-voltage DC-DC converters; ladder core; loss minimisation; magnetic topology; microprocessor power delivery; multiphase voltage regulator modules; numerical optimization; response time improvement; ripple reduction; windings; Couplings; Delay; Design optimization; Inductors; Magnetic circuits; Magnetic cores; Microprocessors; Regulators; Topology; Voltage;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2002. APEC 2002. Seventeenth Annual IEEE
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-7404-5
DOI :
10.1109/APEC.2002.989338
