Title :
Investigation of the steady-state and dynamic characteristics of a buck converter with nonlinear output capacitor current programming
Author :
Cheung, Victor Sui-pung ; Chung, Henry Shu-Hung ; Lo, Alan W L
Author_Institution :
Centre for Power Electron. & Sch. of Energy & Environ., City Univ. of Hong Kong, Kowloon, China
Abstract :
A detailed steady-state and dynamic analysis of a buck converter with nonlinear output capacitor current programming is presented. The advantages of the proposed method are its constant switching frequency operation, simplicity in implementing the switching functions and designing the control parameters, good steady-state and dynamic responses, and high audio susceptibility rejection. The principle of operation and all possible operating cases will be described and discussed. With the inclusion of the effects of the equivalent series resistance (ESR) of the output capacitor, the steady-state output characteristics and small-signal models for studying the system stability will be derived. An experimental prototype of a 25 W, 12 V/5 V buck converter has been built and evaluated.
Keywords :
DC-DC power convertors; capacitors; nonlinear programming; DC-DC conversion; buck converter; constant switching frequency operation; dynamic characteristic analysis; equivalent series resistance effect; high audio susceptibility rejection; nonlinear output capacitor current programming; power 25 W; small-signal models; steady-state output characteristics; system stability; voltage 12 V; voltage 5 V; Capacitors; Converters; Integrated circuits; Stability analysis; Steady-state; Switches; Predictive Control; buck converter; capacitor current control; dc/dc conversion;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2010 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-5286-6
Electronic_ISBN :
978-1-4244-5287-3
DOI :
10.1109/ECCE.2010.5618429
