Efficient power management circuit for biomass‐based energy harvesting system

2020 ◽  
Vol 48 (6) ◽  
pp. 874-886
Author(s):  
Ridvan Umaz
Keyword(s):  
Energy Harvesting ◽  
Power Management ◽  
Energy Harvesting System ◽  
Efficient Power

Hydrokinetic Energy Harvesting System From Vortex Induced Vibrations of Submerged Bodies

2011 ◽  
Author(s):  
Varun Lobo ◽  
Arindam Banerjee ◽  
Nyuykighan Mainsah ◽  
Jonathan Kimball
Keyword(s):  
Boundary Layer ◽  
Energy Harvesting ◽  
Vortex Shedding ◽  
Computational Study ◽  
High Energy ◽  
Power Converter ◽  
Design Parameters ◽  
Hydrokinetic Energy ◽  
Energy Harvesting System ◽  
Efficient Power

A Vortex Induced Vibration (VIV) based hydrokinetic energy system is discussed in this paper. Vibrations induced on a body (facing an external flow) due to the periodic irregularities in the flow caused by boundary layer separation are called as VIV. This separation of the boundary layer from the surface causes vortex formation in the wake region of the cylinder. The lift-force or the transverse oscillation of the vibrating cylinder depends upon the strength and modes of the vortex formed. The VIV energy harvesting system is based on the idea of maximizing rather than spoiling vortex shedding and was discovered in 2004 at the University of Michigan by Bernitsas and Raghavan. The vibrating bodies will in turn be used to harness energy using an efficient power-take-off system. In this paper, we discuss the hydrodynamic design of such a VIV based energy harvesting system using computational fluid dynamics. A fluid structure interaction calculation is performed to determine the forces on the surface of a bluff body due to separation of vortices from the surface. The hydrodynamic forces that act on such a system depend on the cylinder diameter, flow velocity, modes of vortex shedding and arrangement of cylinder(s). A detailed computational study on the effect of different design parameters listed above are first carried on a single cylinder arrangement; this is followed by a more detailed analysis that is extended to multiple cylinders. For a two-cylinder arrangement, the positions in which the cylinders are placed are also found to play an important role, as the vortex shed from one cylinder may be used to enhance the forces of lift on another cylinder present in its wake. Furthermore, the design of a VIV generator requires optimal damping and low mass ratio to enable high energy conversion via an efficient power take-off mechanism. The working and design considerations of the energy converter is outlined starting with a set of basic definitions pertaining to this technology. A tubular linear interior permanent magnet generator (TL-IPM) connected to a power converter is used; a linear generator was chosen to minimize mechanical components, such as gears or cams in the system.

A Power Management Integrated System for Biomass-based Marine Sediment Energy Harvesting

2014 ◽  
Vol 23 (01n02) ◽  
pp. 1450012 ◽  
Author(s):  
Guoxian Huang ◽  
Ridvan Umaz ◽  
Udayarka Karra ◽  
Baikun Li ◽  
Lei Wang
Keyword(s):  
Energy Harvesting ◽  
Power Management ◽  
Integrated Circuit ◽  
Electrical Energy ◽  
Energy Conversion Efficiency ◽  
Integrated System ◽  
Cmos Process ◽  
Energy Harvesting System ◽  
Metabolic Activities ◽  
Sustainable Power

This paper presents the design of an underwater energy harvesting system, which would provide persistent and sustainable power supply for remote underwater sensing and surveillance devices. The system consists of Distributed Benthic Microbial Fuel Cell (DBMFC) and the associated power management integrated circuit. The DBMFC exploits bacterial metabolic activities associated with the redox reaction to generate electrical energy directly from biodegradable substrates. The power management circuit collects the energy harvested by the DBMFC and boosts the output voltage to a sufficient and stable level for loads such as sensor devices. Simulation results of the power management system in a 90nm CMOS process demonstrate the expected functions and the significant improvement in energy conversion efficiency.

scholarly journals RF energy harvesting prototype operating on multiple frequency bands with advanced power management

2020 ◽  
Vol 17 (1) ◽  
pp. 70
Author(s):  
Manee Sangaran Diagarajan ◽  
Agileswari Ramasamy ◽  
Navaamsini Boopalan ◽  
Norashidah Bt. Md Din
Keyword(s):  
Energy Harvesting ◽  
Power Management ◽  
Rf Energy Harvesting ◽  
Frequency Bands ◽  
Dc Power ◽  
Start Up ◽  
Rf Signals ◽  
Nimh Battery ◽  
Rf Energy ◽  
Efficient Power

<span>Radio Frequency (RF) harvesting seems to be catching up as an alternate energy source whereby RF energy is scavenged from ambient sources and converted into renewable energy in terms of DC power. This converted DC power is then utilized to power up devices that require a low start up power in which eliminates the need for battery replacement. In this paper, a novel RF energy harvesting prototype is presented which consists of two microstrip patch antennas operating on GSM (900MHz) and WIFI (2.4GHz) &amp; WiMAX (2.3GHz) frequency bands with a bandwidth of 220MHz and 10.11MHz respectively to harvest RF signals from ambience. Two matching networks are presented as well to ensure efficient power transfer to load. Rectifiers are designed to transform the RF signals to DC power. The converted DC signals are then combined and fed to a power management circuit which charges a 4.2V NiMh battery and drives a load at a regulated output of 3V.</span>

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