Title :
An energy-adaptive MPPT power management unit for micro-power vibration energy harvesting
Author :
Yi, Jun ; Su, Feng ; Lam, Yat-Hei ; Ki, Wing-Hung ; Tsui, Chi-ying
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong
Abstract :
A batteryless power management unit (PMU) that manages harvested low-level vibration energy from a piezoelectric device for a wireless sensor node is presented. An energy-adaptive maximum power point tracking (EA-MPPT) scheme is proposed that allows the PMU to activate different operation modes according to the available power level. The harvested energy is processed by an ac-dc voltage doubler followed by on-chip charge pumps with variable up/down conversion ratios for higher efficiency. Interleaving technique is employed for the high-power output to reduce both current and voltage ripples. The PMU is designed using a 0.35mum CMOS process, and simulation results are presented to demonstrate its functions.
Keywords :
AC-DC power convertors; CMOS integrated circuits; energy management systems; piezoelectric devices; ac-dc voltage doubler; batteryless power management unit; energy-adaptive MPPT power management unit; energy-adaptive maximum power point tracking scheme; micropower vibration energy harvesting; on-chip charge pumps; piezoelectric device; size 0.35 micron; wireless sensor node; Battery management systems; Energy consumption; Energy management; Engineering management; Phasor measurement units; Piezoelectric devices; Radio frequency; Switching converters; Technology management; Voltage;
Conference_Titel :
Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-1683-7
Electronic_ISBN :
978-1-4244-1684-4
DOI :
10.1109/ISCAS.2008.4541981
