Optimization of Charge Pump Based on Piecewise Modeling of Output-Voltage Ripple

Yajun Lin, Jianxin Yang, Tin-Wai Mui, Yong Zhou and Ka-Nang Leung
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Yajun Lin: Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong
Jianxin Yang: School of Microelectronics, South China University of Technology, Guang Zhou 510000, China
Tin-Wai Mui: Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong
Yong Zhou: Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong
Ka-Nang Leung: Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong

Energies, 2021, vol. 14, issue 16, 1-14

Abstract: This work proposes a piecewise modeling of output-voltage ripple for linear charge pumps. The proposed modeling can obtain a more accurate design expression of power-conversion efficiency. The relationship between flying and output capacitance, as well as switching frequency and optimize power-conversion efficiency can be calculated. The proposed modeling is applied to three charge-pump circuits: 1-stage linear charge pump, dual-branch 1-stage linear charge pump and 4× cross-coupled charge pump. Circuit-level simulation is used to verify the accuracy of proposed modeling.

Keywords: charge pump; flying and output capacitances; output-voltage ripple; power-conversion efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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