Multi-source energy harvesting system for wireless sensor networks /
Mahmoud Mohamed Rashad Ibrahim Elhebeary
Multi-source energy harvesting system for wireless sensor networks / نظام حصد طاقة من مصادر متعددة لشبكات الاستشعار اللاسلكيه Mahmoud Mohamed Rashad Ibrahim Elhebeary ; Supervised Ahmed Nader Mohi Eldin , Mohamed Mostafa Aboudina - Cairo : Mahmoud Mohamed Rashad Ibrahim Elhebeary , 2015 - 75 P. : charts , facsimiles ; 30cm
Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Electronics and Communication
In this thesis, a multi-input multi-output energy harvesting system that combines piezoelectric and photovoltaic sources is presented. It is a dual path system that uses a single inductor for both boost and buck converter. The boost converter, working in the discontinuous conduction mode (DCM), utilizes an active diode (AD) technique to avoid negative current Àowing in the inductor and a control technique that allows supplying dual output voltage levels with sucient power. The AD is implemented using a level-sensitive clocked comparator that is driven by the system clock while consuming 350nA only. The system undergoes four states of operation to achieve two voltage levels at the output of 1.2V and 3V. The system clock is chosen as a compromise between required speed of the comparator, switching losses, and size of external inductor. Switch sizing programmability and digital control for the loads connected to the energy harvesting system is introduced to achieve better eciency and to make use of the transducers all the time. Post-layout simulation results show an overall eciency of 92% for an input power of 1.2 mW while providing two outputs at 1.2V and 3V in 130nm CMOS technology
Energy harvesting Multi-output boost converter Wireless sensor networks
Multi-source energy harvesting system for wireless sensor networks / نظام حصد طاقة من مصادر متعددة لشبكات الاستشعار اللاسلكيه Mahmoud Mohamed Rashad Ibrahim Elhebeary ; Supervised Ahmed Nader Mohi Eldin , Mohamed Mostafa Aboudina - Cairo : Mahmoud Mohamed Rashad Ibrahim Elhebeary , 2015 - 75 P. : charts , facsimiles ; 30cm
Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Electronics and Communication
In this thesis, a multi-input multi-output energy harvesting system that combines piezoelectric and photovoltaic sources is presented. It is a dual path system that uses a single inductor for both boost and buck converter. The boost converter, working in the discontinuous conduction mode (DCM), utilizes an active diode (AD) technique to avoid negative current Àowing in the inductor and a control technique that allows supplying dual output voltage levels with sucient power. The AD is implemented using a level-sensitive clocked comparator that is driven by the system clock while consuming 350nA only. The system undergoes four states of operation to achieve two voltage levels at the output of 1.2V and 3V. The system clock is chosen as a compromise between required speed of the comparator, switching losses, and size of external inductor. Switch sizing programmability and digital control for the loads connected to the energy harvesting system is introduced to achieve better eciency and to make use of the transducers all the time. Post-layout simulation results show an overall eciency of 92% for an input power of 1.2 mW while providing two outputs at 1.2V and 3V in 130nm CMOS technology
Energy harvesting Multi-output boost converter Wireless sensor networks