Design and analysis of quasi-switched-capacitor step-up DC/DCconverters
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(0) (0 Votes)Views: (2040) Date: (Publication Date: 31 May-3 Jun...) Pages: () -
Author: Chung H. Dept. of Electron. Eng. City Univ. of Hong Kong Kowloon;
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Abstract: Abstract A new switched-capacitor (SC)-based step-up DC/DC converter is proposed. It has the prominent features of continuous input current waveform and having better regulation capability than the traditional SC converters. The problem of conducted electromagnetic interference (EMI) with the supply network is minimized. Concept of energy transfer is achieved by using dual basic SC step-up converter cells operating in antiphase. The voltage conversion ratio is controlled by a current control scheme in order to adjust the charging profile of the capacitors. A generalized n-stage converter is presented and is analyzed by a simplified third order state-space equation set. The static and dynamic behaviors and the design constraints of the proposed converter are derived. A prototype of 30 W, 5 V/12 V, 2-stage converter has been built, giving an overall efficiency of 78% with power density of 15 W/in 3
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