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Derivation of a nonlinear output capacitor current programming technique applicable for a buck converter operating in CCM and DCM

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3 Author(s)
Cheung, V.S. ; Centre for Power Electron. & Sch. of Energy & Environ., City Univ. of Hong Kong, Kowloon, China ; Chung, H.S.-H. ; Lo, A.W.L.

The derivation of a nonlinear output capacitor current programming technique applicable for a buck converter operating in continuous and discontinuous conduction modes is presented. The proposed control method can make the converter system exhibit fast transient response to large-signal disturbances. Its principle of operation is based on using the output capacitor current and instantaneous output voltage to predict the output voltage at the end or middle of a switching cycle to dictate the state of the switch. With the inclusion of the effects of the equivalent series resistance (ESR) of the output capacitor, the system stability, steady-state characteristics, and output sensitivity to circuit component variation will be discussed. The proposed method has been verified by comparing the experimental results of a 25 W, 12V/5V prototype with theoretical predictions.

Published in:

Energy Conversion Congress and Exposition (ECCE), 2010 IEEE

Date of Conference:

12-16 Sept. 2010