Title :
Design and analysis of quasi-switched-capacitor step-up DC/DC converters
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, Hong Kong
fDate :
31 May-3 Jun 1998
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
Keywords :
DC-DC power convertors; electromagnetic interference; equivalent circuits; interference suppression; nonlinear network analysis; nonlinear network synthesis; state-space methods; switched capacitor networks; 12 V; 30 W; 5 V; 78 percent; SC-based DC/DC converter; conducted EMI suppression; continuous input current waveform; current control scheme; design constraints; dynamic behavior; electromagnetic interference; quasi-switched-capacitor DC/DC converters; static behavior; step-up DC/DC converters; third order state-space equation set; voltage conversion ratio; Capacitors; DC-DC power converters; Electromagnetic interference; Energy exchange; Equations; Prototypes; Pulse width modulation; Switches; Switching converters; Voltage;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.705305
