Title :
Designing a Dynamic Ramp With an Invariant Inductor in Current-Mode Control for an On-Chip Buck Converter
Author :
Wen-Wei Chen ; Jiann-Fuh Chen ; Tsorng-Juu Liang ; Lu-Chi Wei ; Wei-Yuan Ting
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
Abstract :
Designing a dynamic ramp with an invariant inductor in current-mode control for an on-chip Buck converter is proposed in this paper. This configuration maintains system stability under different input/output voltages without changing the inductor and compensation circuit. The dynamic ramp can be adjusted according to the variation in the output voltage or the voltage droop between the input voltage and the output voltage to maintain bandwidth and phase margin using the invariant inductor and compensation circuit. Finally, 14-V input voltage, 12-V output voltage, and 24-W output power with the dynamic ramp sampling the output voltage is implemented using MathCAD predictions, SIMPLIS simulation results, and experimental results to verify its viability and superiority.
Keywords :
electric current control; inductors; power convertors; stability; MathCAD predictions; SIMPLIS simulation; compensation circuit; current-mode control; dynamic ramp design; dynamic ramp output; input-output voltages; invariant inductor; on-chip buck converter; phase margin; power 24 W; system stability; voltage 12 V; voltage 14 V; Circuit stability; Generators; Inductance; Inductors; Switching frequency; Tin; Voltage control; Current-mode control; dynamic ramp; invariant inductor;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2013.2256151
