Title :
Using modified z-transforms to model the dynamics of the peak current-mode controlled buck converter
Author_Institution :
Bowling Green State Univ., Bowling Green
Abstract :
This paper examines the stability of the peak current-mode controlled buck converter in the z-domain. For this, modified z-transforms were used which allowed the accurate model of the delay in the control loop. It is shown that the presence of subharmonic oscillations can be predicted and that the amount of compensating ramp needed for their elimination can be determined.
Keywords :
Z transforms; harmonic oscillators (circuits); power convertors; control loop; modified z-transforms; peak current-mode controlled buck converter; ramp compensation; subharmonic oscillations; z-domain; Buck converters; Clocks; Delay effects; Digital control; Flip-flops; Frequency conversion; Frequency domain analysis; Power system modeling; Stability criteria; Voltage control; buck converter; digital power; modified z-transforms; peak current-mode control;
Conference_Titel :
Electro/Information Technology, 2007 IEEE International Conference on
Conference_Location :
Chicago, IL
Print_ISBN :
978-1-4244-0941-9
Electronic_ISBN :
978-1-4244-0941-9
DOI :
10.1109/EIT.2007.4374529
