The search functionality is under construction.

IEICE TRANSACTIONS on Fundamentals

Characteristics Analysis of Fibonacci Type SC Transformer

Ikko HARADA, Fumio UENO, Takahiro INOUE, Ichirou OOTA

  • Full Text Views

    0

  • Cite this

Summary :

For a realization of a DC-DC converter using no magnetic devices, a new switched capacitor (SC) transformer is introduced, which gives voltage ratios by Fibonacci series corresponding to the stages. This transformer is connected in cascade by each basic block which is assembled by a capacitor and three MOSFET switches. This operates on a simple two-phase clock and has a large step-up or step-down voltage ratio in spite of its simple configuration. The characteristics of this transformer with n stages of basic block are derived and calculated by means of a 4 4 cascade matrix. The optimal arrangement of each stage's capacitances is shown to reduce the SC resistance by about 20%. The simulation results are compared with the characteristics of a prototype transformer with four stages (8 times step-up ratio). Its power efficiency achieves 88% in case of 97 V output voltage, 0.2 A output current, and 100 kHz switching frequency. Lastly, the proposed SC transformer is compared and discussed with other typical SC transformers.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E75-A No.6 pp.655-662
Publication Date
1992/06/25
Publicized
Online ISSN
DOI
Type of Manuscript
Special Section PAPER (Special Section of Papers Selected from 1991 Joint Technical Conference on Circuits/Systems, Computers and Communications (JTC-CSCC '91))
Category
Analog-IC Circuit Analysis and Synthesis

Authors

Keyword