Title :
Analysis of High-Frequency IGBT Soft Switching Buck Converter With Saturable Inductors
Author :
Dallago, Enrico ; Passoni, Marco ; Venchi, Giuseppe
Author_Institution :
Dept. of Electr. Eng., Pavia Univ.
fDate :
3/1/2007 12:00:00 AM
Abstract :
In this paper, a high switching frequency buck converter using insulated gate bipolar transistors (IGBTs) is presented. This was done by using an auxiliary branch made of an IGBT of the same type as the one used for the main switch and saturable inductors. The proposed topology allows both switches to be fully soft switched to keep the efficiency high over a wide load range. Because of its topology the open loop behavior of the converter can be unstable. A detailed small signal analysis is presented to explain this behavior and as a basis for the synthesis of a closed loop controller. Experimental measurements on a laboratory prototype demonstrated the accuracy of the small signal analysis and validated the operation of the auxiliary network. The resulting efficiency is around 92% over a 200 to 800W output power range and at a 80-kHz switching frequency
Keywords :
closed loop systems; inductors; insulated gate bipolar transistors; switching convertors; 200 to 800 W; 80 kHz; IGBT; auxiliary branch; closed loop controller; high-frequency soft switching buck converter; insulated gate bipolar transistors; saturable inductors; small signal analysis; Buck converters; Inductors; Insulated gate bipolar transistors; Network synthesis; Open loop systems; Signal analysis; Signal synthesis; Switches; Switching frequency; Topology; Insulated gate bipolar transistor (IGBT); pulsewidth modulation (PWM); zero voltage switching (ZVS);
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2006.889907