Photovoltaic (PV) energy as recharge source for portable devices such as mobile phones

This paper presents opportunities to recharge portable devices, in particular mobile phones, with photovoltaic (PV) energy. Conventional available PV chargers suffer from the disadvantage of long charging times, which are unacceptable for the users of these types of electronics. We review approaches to overcome this drawback and discuss possibilities to shorten the recharging time. We present efficient system configurations, which help that PV energy becomes part of our daily life

Efficient Solar Powered Smartphone for Nigeria’s Telecom Advancement

This study is aimed at producing an efficient model design of a solar-powered Smartphone that can be used continuously without the need to recharge their batteries from electrical outlets. There has been recent significant advancements in the research aimed at developing solar powered Smartphones as against the Smartphones we have today that requires frequent recharge of their batteries from electrical outlets. But these advancements have only produced solar Smartphone with efficiency of less than 19%. This study is theoretical due to lack of fund to produce the empirical design of the efficient solar powered Smartphone. However, it is intended to provide a new direction for Researchers in solar powered Smartphone Design to enable them produce efficient models that can continuously work for years without recharging their batteries. Keywords: Smartphone, Graphene, Photovoltaic, Supertransformer, Electrically-Doped Semiconductor, Sola

Multi Source Handphone Charging System For Communication During Emergencies

Emergency situations may arise due to natural disaster occurrences or when chance takes one to a remote location. In settings like this, communication requires that mobile devices are powered on in the expectation of access to relief and rescue services. However, in many cases the electricity supply will be broke down. Usually, alternative energy sources provide the needed power to mobile phones in such circumstances. These alternative energy sources exhibit peculiar limitations that affect availability. This work was aimed at merging various alternative sources into a unit that will provide potential to a mobile phone with an emphasis on enhancing the efficiency of a hand-cranked electric dynamo source. Three power sources are employed which are active human power in the electric dynamo, solar panels and a pair of rechargeable batteries. Preliminary tests and analysis were conducted for hardware selection and assembly. The completed system contains a manual switch for the energy sources, a dc-dc regulation, battery charging electronic layout and a torchlight for illumination. An improved efficiency of 87.5% was achieved for the dynamo with the system able to deliver an average 0.4 W during operation. An average of 21 minutes elapsed before a minimum charge was delivered to a basic phone. The charging times for a smartphone to a determined level was found to be 108 minutes, 86 minutes and 72 minutes for the solar source, dynamo source and battery source, respectively. The developed unit is useful to people to keep it as a tool that they can rely on to power up their mobile phone in order to send emergency rescue message

Efficient use of solar chargers with the help of ambient light sensors on smartphones

This paper discusses the possibilities to measure the amount of light with the help of portable devices such as mobile phones and tablets. Focus is directed to the accuracy of the ambient light sensor on smartphones in order to obtain the illuminance indoors and the solar radiation level outdoors. In general, information on the ambient conditions is vital to improve the performance of solar chargers. For example, if users are able to allocate beneficial locations to deploy solar chargers inside buildings, up to 100 times more energy can be gathered during the same periodic time. Similarly, under outdoor environmental conditions, solar modules can be aligned better towards the sun to increase the possible amount of output power. We analyse the accuracy of ambient light sensors which are available in today's low-cost and upper-class smartphones. Additionally, we present calibration strategies for ambient light sensors in order to minimise the error between conventional measurement equipment and mobile phones

Portable Power Supply with Ultraeapacitor Application

Portable power supply reqmres a means of storing energy for powering applications. Energy storage is typically limited to alk:aline or rechargeable batteries. In either instance, the batteries require replacing or recharging

SOLAR POWER OPERATED TABLE FOR CHARGING ELECTRONIC GADGETS

The objective of the work is to apply solar power for charging electronic appliances namely iPhones. The circuit is designed for low ampere and high ampere charging by using PROTEUSsoftware and fabricated and tested for its performance. The time required for full charging of iphone5 with 1A charging is 90 minutes whereas it is only 50 minutes with 2A charging port. Solar power operated table can be developed by the companies for charging electronic gadgets such as mobile phones that can be employed in public places such as parks, bus stations, and airports. Another feature of this product is that three consumers can charge at a time. Charging of electronic gadgets can be done by the common public by drawing power from the battery charged by solar power thereby reducing consumption of electricity from the main grid. The system with 1A and 2A charging of i-phones using solar power operated battery is unique and new to the locality of Caledonian college of engineering and the work can be extended to other parts of Sultanate of Oman

Energy challenges for ICT

The energy consumption from the expanding use of information and communications technology (ICT) is unsustainable with present drivers, and it will impact heavily on the future climate change. However, ICT devices have the potential to contribute signi - cantly to the reduction of CO2 emission and enhance resource e ciency in other sectors, e.g., transportation (through intelligent transportation and advanced driver assistance systems and self-driving vehicles), heating (through smart building control), and manu- facturing (through digital automation based on smart autonomous sensors). To address the energy sustainability of ICT and capture the full potential of ICT in resource e - ciency, a multidisciplinary ICT-energy community needs to be brought together cover- ing devices, microarchitectures, ultra large-scale integration (ULSI), high-performance computing (HPC), energy harvesting, energy storage, system design, embedded sys- tems, e cient electronics, static analysis, and computation. In this chapter, we introduce challenges and opportunities in this emerging eld and a common framework to strive towards energy-sustainable ICT

Application of Nanotechnology for Environmental Problem

Due to extensive human economic activities and their population growth, Environment of our planet is rapidly losing its quality in its every part (air water, soil, forest etc). The air and water parts are the easily affected entities of our environment. Use of non-renewable energy for manufacturing, transportation, home etc is directly related with environmental pollution. To reverse these negative effects on the environment, many attempts have been made so far by using different approaches, although the problem is still on the rise. The approach by nanotechnology is highly promised because of the unique properties of nanomaterials. This technology has already shown the potential to treat our environment including air and water purification, solving energy crisis, protecting our skin from skin cancer, increasing agricultural production etc. In this review paper, the application of nanotechnology in air and water purification, in energy sector and in the production of sunscreen lotion and its use for skin to protect our skin from strong sun radiation have been reviewed. Keywords: Environment; Nanotechnology; Pollution; Nanomaterial

Performance Evaluation of Energy Harvesting Method on Intelligent Wearable Travel Aid Device for Blind Person

The intelligent wearable travel aid device has been developed for blind person usage for traveling purposes. The intelligent wearable travel aid device will be used along with the long cane that is usually used to detect any obstructions around the blind person. However, the problem on power supply to supply the electrical energy for the intelligent wearable travel aid device to work properly always been occurred. In order to fit the energy harvesting device on the intelligent wearable travel aid device, the comparison of the solar panel and photodiode is done. The performance evaluation to compare theenergy harvesting method on the developed intelligent wearable travel aid device for blind person has been conductedbased on the experiment result. The photodiode is proposed in this study due to small size and easy to arrange on top of developed wearable travel aid device compared to the solar panel which big size but commonly used as energy harvesting device. Consequently, the experimental result of the intelligent wearable travel aid device in terms of voltage, current and light intensity for the improved version with different type of configuration is proven respectively