Modelling of maximum power efficiency of charge pump circuits

Author

Wong, Oi-Ying ; Wong, Hang ; Tam, Wing-Shan ; Kok, Chi-Wah

Author_Institution

Dept. of Electron. Eng., City Univ. of Hong Kong, Hong Kong, China

Volume

50

Issue

17

fYear

2014

fDate

Aug. 14 2014

Firstpage

1233

Lastpage

1234

Abstract

The loss estimation in a switched-capacitor DC-DC converter has caused much controversy because of the uncertainty of the contribution of device parasitics to the power efficiency of a converter. Beginning from a simple equivalent circuit model, a closed-form solution to the maximum achievable power efficiency of a converter in which both the effects of parasitic resistance and capacitance are taken into account is presented. It has been observed that the peak power efficiency of a Dickson charge pump depends mainly on the equivalent parasitic capacitance of a given technology and its operation mode, which is governed by the choices of the coupling capacitance, on-resistance of the switch, as well as the operation frequency of the circuit.

Keywords

DC-DC power convertors; charge pump circuits; equivalent circuits; switched capacitor networks; switching convertors; Dickson charge pump; charge pump circuits; closed-form solution; coupling capacitance; equivalent circuit model; equivalent parasitic capacitance; loss estimation; maximum power efficiency; operation frequency; parasitic resistance; peak power efficiency; switched-capacitor DC-DC converter;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2014.0979

Filename

6880228