Title :
Design of a step-up/step-down SC DC-DC converter with series-connected capacitors
Author :
Eguchi, Kei ; Zhu, Hongbing ; Ueno, Fumio ; Tabata, Toru
Author_Institution :
Dept. of Inf. & Comput. Sci., Kumamoto Nat. Coll. of Technol., Japan
Abstract :
A step-up/step-down switched-capacitor (SC) DC-DC converter with series-connected capacitors is proposed in this paper. The circuit can provide more various types of output-voltages than conventional converters, because the series-connected capacitors in a ring-connection enable us to convert an input voltage at short step-up/step-down interval. Furthermore, high efficiency can be achieved by using the power-switches with novel bootstrap circuits. Via maximum circuits constructed with diodes, maximum voltage of the power converter is charged to a capacitor in the bootstrap circuit. By connecting the charged-capacitor between the gate terminals of power-switches and the output terminal of the maximum circuit, the bootstrap circuits reduce the on-resistance of the power-switches. The simulations show that 1) the proposed circuit can realize shorter step-up/step-down interval than the conventional ring-type power converter and 2) the efficiency is more than 95% when the output load Ro=100 Ω.
Keywords :
DC-DC power convertors; nonlinear network synthesis; switched capacitor networks; 100 ohm; 95 percent; DC-DC converter design; bootstrap circuits; bootstrapped gate transfer switch; high efficiency; power-switches; ring-connection; series-connected capacitors; step-up/step-down SC DC-DC converter; Clocks; Computational Intelligence Society; Computer science; DC-DC power converters; Diodes; Educational institutions; Joining processes; Switched capacitor circuits; Systems engineering and theory; Voltage;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1205015
