WSEAS Transactions on Circuits and Systems
Print ISSN: 1109-2734, E-ISSN: 2224-266X
Volume 15, 2016
Exponential Step-up/Step-down Type Switched-Capacitor Power Supply with Variable Conversion Ratio
Authors: , , ,
Abstract: In this paper, a switched-capacitor(SC) power supply which can obtain exponential conversion ratios is J (+-K) proposed (J and K are integer). The conversion ratio can be varied between J -K and J +K by shifting the clock phase of each switch. Concerning the general proposed circuit, the ideal step-up ratio is analyzed changing J and K at no-load, and HSPICE simulations are performed under the J=2 and J=3 types. As a result, (1) at no-load, J=3 type can obtain the highest step-up voltage ratio with the same number of elements, (2) under the load, J=2 type can obtain the highest power conversion efficiency with the same chip-size and the same turn-on/turn-off time of each switch. Furthermore, the inrush current can be decreased by changing conversion ratio at start-up.
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Keywords: switched-capacitor power supply, exponential step-up/step-down, DC-DC converter, small-sized and lightweight, inrush current
Pages: 165-170
WSEAS Transactions on Circuits and Systems, ISSN / E-ISSN: 1109-2734 / 2224-266X, Volume 15, 2016, Art. #19