TY - JOUR
T1 - Analysis and implementation of a power management unit with a multiratio switched capacitor DC–DC converter for a supercapacitor power supply
AU - Madeira, Ricardo
AU - Paulino, Nuno Filipe Silva Veríssimo
N1 - Sem PDF conforme despacho.
info:eu-repo/grantAgreement/EC/H2020/644852/EU#
This work was partially funded by the European project PROTEUS (id: 644852) and by the Portuguese Foundation for Science and Technology (FCT/MCTES) (CTS multiannual funding) through PEST (UID-EEA/EEI/00066/2013).
PY - 2016/11
Y1 - 2016/11
N2 - An energy-harvesting system requires an energy-storing device to store the energy retrieved from the surrounding environment. Rechargeable batteries are commonly used to store this energy; however, because of the limited number of charge/discharge cycles, they need to be periodically replaced. A supercapacitor, which has, ideally, a limitless number of charge/discharge cycles, avoids this problem. In this case, it is required for the power management unit to produce a constant output voltage as the supercapacitor discharges. This paper presents a system with a multiratio switched capacitor DC-DC converter, in a 130-nm technology, with a maximum output power of 2mW, a maximum efficiency of 79.63% and a maximum output ripple, in the steady state, of 23mV for an input voltage range of 2.3-0.87V. The proposed converter has four operation states, to maximize its efficiency, that correspond to the conversion ratios of 1/2, 2/3, 1/1 and 3/2. Its clock frequency is automatically adjusted to produce a stable output voltage of 1V. These features are implemented through two distinct controller circuits that use two asynchronous time machines to dynamically adjust the clock frequency and to select the active state of the converter.
AB - An energy-harvesting system requires an energy-storing device to store the energy retrieved from the surrounding environment. Rechargeable batteries are commonly used to store this energy; however, because of the limited number of charge/discharge cycles, they need to be periodically replaced. A supercapacitor, which has, ideally, a limitless number of charge/discharge cycles, avoids this problem. In this case, it is required for the power management unit to produce a constant output voltage as the supercapacitor discharges. This paper presents a system with a multiratio switched capacitor DC-DC converter, in a 130-nm technology, with a maximum output power of 2mW, a maximum efficiency of 79.63% and a maximum output ripple, in the steady state, of 23mV for an input voltage range of 2.3-0.87V. The proposed converter has four operation states, to maximize its efficiency, that correspond to the conversion ratios of 1/2, 2/3, 1/1 and 3/2. Its clock frequency is automatically adjusted to produce a stable output voltage of 1V. These features are implemented through two distinct controller circuits that use two asynchronous time machines to dynamically adjust the clock frequency and to select the active state of the converter.
KW - LOW-VOLTAGE
KW - CMOS
KW - RELIABILITY
U2 - 10.1002/cta.2209
DO - 10.1002/cta.2209
M3 - Article
SN - 0098-9886
VL - 44
SP - 2018
EP - 2034
JO - International Journal of Circuit Theory and Applications
JF - International Journal of Circuit Theory and Applications
IS - 11
ER -