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

Volume

29

Issue

2

fYear

2014

fDate

Feb. 2014

Firstpage

750

Lastpage

758

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;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2013.2256151

Filename

6491486