Title :
V2 control with capacitor current ramp compensation using lossless capacitor current sensing
Author :
Yingyi Yan ; Pei-Hsin Liu ; Lee, Fred ; Qiang Li ; Shuilin Tian
Author_Institution :
Bradley Dept. of Electr. & Comput. Eng., Virginia Tech, Blacksburg, VA, USA
Abstract :
V2 control is a popular control architecture in point-of-load Buck converters due to its simplicity and fast transient response. V2 control with ceramic capacitor has instability issue. This paper reviews the existing solutions and their limitations are studied. A solution using output capacitor current ramp to stabilize the control loop is proposed. The analog capacitor current sensing method based on impedance match is used in the implementation of lossless current sensing. A small signal equivalent circuit is proposed for the analysis of the proposed control method. The proposed solution is superior to existing compensation methods for the excellent transient response for a wide range of duty cycle. The effectiveness of the concept and implementation are verified by experimental results.
Keywords :
capacitive sensors; ceramic capacitors; circuit stability; compensation; electric sensing devices; equivalent circuits; impedance matching; power convertors; transient response; voltage control; V2 control; analog capacitor current ramp compensation method; ceramic capacitor; control architecture; control loop stability; duty cycle; fast transient response; impedance matching; lossless capacitor current sensing; output capacitor current ramp; point-of-load buck converters; small signal equivalent circuit; voltage control; Capacitors; Impedance; Inductors; Sensors; Transient analysis; Transient response; Voltage control;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2013 IEEE
Conference_Location :
Denver, CO
DOI :
10.1109/ECCE.2013.6646689
