Title :
Stability analysis of multiple-output DC-DC converters with cross and precise regulations
Author :
Nojiri, Yoshihiro ; Ohyama, Ichiro ; Negome, Taketo ; Zaitsu, Toshiyuki ; Ninomiya, Tamotsu ; Shoyama, Masahito
Author_Institution :
Graduate Sch. of Eng. Sci., Kyushu Univ., Fukuoka, Japan
Abstract :
A multiple-output DC-DC power converter using cross-regulation enables a reduction in size, weight and cost. However, the effect of the smoothing capacitances on the power converter stability has not been discussed enough. Besides, the input circuit is usually required to be isolated from the output side, and the combination of a photo-coupler and a shunt-regulator is often used. However, these components have phase delay and deteriorate the power converter stability. This paper analyzes the stability of three kinds of multiple-output DC-DC power converters using the cross regulation. In the analysis, the transfer function of the photo-coupler and shunt-regulator is estimated from the measured data. Finally, the relationship between the stability boundaries of the power converters and the smoothing capacitances is focused for the size reduction
Keywords :
DC-DC power convertors; circuit stability; equivalent circuits; transfer function matrices; cross-regulation; multiple-output DC-DC power converter; phase delay; photo-coupler; shunt-regulator; size reduction; smoothing capacitance; stability analysis; stability boundaries; transfer function; Adaptive control; Capacitance; Circuit stability; Costs; Coupling circuits; DC-DC power converters; Delay; Size control; Smoothing methods; Stability analysis;
Conference_Titel :
Power Electronics Specialists Conference, 1998. PESC 98 Record. 29th Annual IEEE
Conference_Location :
Fukuoka
Print_ISBN :
0-7803-4489-8
DOI :
10.1109/PESC.1998.701926
