Title :
Power- & area-efficiency enhancement techniques of switched-capacitor power converters for low-power applications
Author :
Hoi Lee ; Zhe Hua
Author_Institution :
Dept. of Electr. Eng., Univ. of Texas at Dallas, Richardson, TX, USA
Abstract :
Switched-capacitor (SC) power converters that use capacitors as energy storage elements offer much better power density than switched-inductor counterparts and are thus attractive in low-power area-constrained applications. This paper first reviews the importance of having auto-reconfigurable conversion ratios in the SC power stage in order to enable the regulator to maintain high power efficiency under unstable input voltages. To minimize the required capacitors and power switches in SC power converters, multiple-output SC power regulators can share capacitors and power switches in the power stage for generating multiple regulated outputs and thus improving the converter area efficiency. To simultaneously illustrate above concepts, an auto-reconfigurable dual-output SC power regulator is developed to generate two outputs while saving 1 flying capacitor and 3 power switches compared with using two independent single-output doubler and tripler. The proposed regulator has minimal cross regulation between outputs and achieves a maximum power efficiency of 88% via auto-reconfiguration when the input voltage varies from 1.1V to 1.6V.
Keywords :
capacitors; switches; switching convertors; auto-reconfigurable conversion ratio; auto-reconfigurable dual-output SC power regulator; converter area efficiency; energy storage element; flying capacitor; low-power application; low-power area-constrained application; multiple-output SC power regulator; power efficiency; power switch; single-output doubler; single-output tripler; switched-capacitor power converter; Capacitors; Energy harvesting; Power transistors; Regulators; Sensors; Switching circuits; Voltage control; auto-reconfiguration; multiple-output switched-capacitor power converters;
Conference_Titel :
Electron Devices and Solid-State Circuits (EDSSC), 2013 IEEE International Conference of
Conference_Location :
Hong Kong
DOI :
10.1109/EDSSC.2013.6628143