Title :
On the use of current control scheme for switched-capacitor DC/DC converters
Author :
Chung, Henry Shu-Hung ; Hui, S.Y.R. ; Tang, S.C. ; Wu, A.
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, Hong Kong
fDate :
4/1/2000 12:00:00 AM
Abstract :
This paper presents an investigation into the use of a current control scheme (CCS) and a comparison with a classical switching scheme for switched-capacitor (SC) step-down DC/DC converters. With the CCS, capacitors are charged with near-constant current, controlled by the gate-source voltage of MOSFETs. By paralleling two SC cells, the converter input current becomes continuous, resulting in much reduced conducted electromagnetic interference with other circuits fed by the same power supply. All MOSFETs are operated for half of the switching period, in order to improve the regulation capability. Static and dynamic behaviors of the converter with the CCS are predicted and confirmed in an experimental 36 W 12 V/9 V prototype
Keywords :
DC-DC power convertors; electric current control; power MOSFET; power capacitors; power semiconductor switches; switched capacitor networks; switched mode power supplies; switching circuits; 12 V; 36 W; 9 V; MOSFETs; classical switching scheme; current control scheme; dynamic behavior; gate-source voltage; near-constant current capacitor charging; regulation capability; static behavior; switched capacitor step-down DC/DC converters; switched-capacitor DC/DC power converters; witching period,; Capacitors; Carbon capture and storage; Circuits; Current control; DC-DC power converters; Electromagnetic interference; MOSFETs; Power supplies; Prototypes; Voltage control;
Journal_Title :
Industrial Electronics, IEEE Transactions on
