The conventional unmanned aerial vehicles have limited supply of power due to which they are grounded after designated hours of flight. In this paper, the autonomous charging of UAVs is proposed, developed, implemented to increase the battery charging and operational life. The development of automated charging system for UAVs is achieved by utilizing the solar based charging system by means of charging stations marked throughout the route of a UAV. The drone, according to the predefined programming, evaluates its charging level and when the level drops below the set threshold, it lands on a landing site. The UAV can charge itself through contact-based charging functionality without a human's interference. This allows the UAVs to stay in flight for longer periods of time and does not requires intervention of humans to change the battery pack. This will increase the efficiency in terms of surveillance and allows the legal agencies carrying out surveillance to maintain their cover and achieve footage which might have been lost while landing the UAV to change the battery pack. This system can perform surveillance to be carried out by a single UAV as it does not rely upon human's support for the supply of power. The improvement in the battery life allows UAVs to hover for longer hours thus avoiding the risk of crash landings and damage to the UAVs.
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The Solar photovoltaic (PV) power system have achieved meteoric rise through the years. The uptake is not difficult to explaina drop in cost of PV systems and spiraling electricity cost, have encouraged the end-user to lessen their bills by producing cheaper electricity and can generate revenue by feeding excess power back to the grid. The solar PV is intermittent in nature so it dependent on irradiance and ambient temperature. Power electronics technologies plays an important part for optimizing the energy harvesting from PV system. In order to get maximum extracted power and ensure the load is supplied with a good quality voltage, different dc-dc converters topologies and inverters configurations are used. This paper provides an overview of PV inverter configurations and DC-DC topologies to offer a useful insight and reference point for the researchers working in the field of photovoltaic system.
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