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May 23, 2018Open    AccessArticle

Optimization Comparison of Stand-Alone and Grid-Tied Solar PV Systems in Rwanda

Samuel Bimenyimana, Godwin Norense Osarumwense Asemota, Paula Jeanne Ihirwe
Solar power has gained great usage in electricity generation world-wide, and stand-alone is common in Rwanda. Site visits and energy audit estimates for a typical residential house in Rwamagana district, were used to cost effectively compare stand-alone and grid-tied PV systems able to supply 7.2 kWh/day, load. Algorithms design of lifetime costs and benefits were developed, to analyse total daily energy requirements using Frequen

Apr 28, 2018Open    AccessArticle

Direct Current Charger Hardware Platform Design

Yu Zhang
In order to reduce the pollution caused by fuel vehicles to the environment, electric vehicles are becoming the means of transportation. The replacement of fuel vehicles by electric vehicles is a future trend. Based on practical requirements, a 120 kW direct current charger has been designed. Taking the MK60DN512 as the core controller, a direct current charger control system is designed and implemented. The overall solution of th

Apr 19, 2018Open    AccessArticle

The Design and Realization of PKE System Based on ARM9

Tongfei Tu, Suyun Luo
In order to solve the problem that the PKE (passive keyless enter) with a fixed-frequency used in middle and low grade cars was interfered and broken easily, which led to the damage of anti-theft system and even the loss of cars, and in order to ensure the PKE can be used long and be expanded and upgraded in the future, a new, low power consumption and high reliability PKE was designed with the S3C2410 micr

Apr 12, 2018Open    AccessArticle

Automatic Irrigation System Using Android

Souvanxay Lorvanleuang, Yandong Zhao
Laos is an agricultural based country. As agriculture is the main source of food for any country, it is important to have a proper irrigation system. This paper shows a design of automatic irrigation system based on android application using Raspberry Pi microcontroller, soil moisture and temperature sensor to help a famer to control and monitor a farm. This work facilitates the farm irrigation by switching the pump motor ON/OFF t

Feb 13, 2018Open    AccessArticle

Using Three Op Amp Simple AM/FM Radio Circuit

Min Jiang
After nearly a year of probation, the type of AM radio repeater circuit in general can be retrieved in a number of local radio stations; the installation is convenient, the output has a loud voice, and bass is rich, which make it indeed a good choice for beginners’ homemade radio circuit. Beginners can give radio principle about double harvest theory and practice. The whole circuit fabrication costs low. The AM circuit is

Feb 09, 2018Open    AccessArticle

Design of Drive System for Sensorless Brushless DC Motor Based on Model Reference Adaptive Control and Its Application in Horizontal Well Tractor

Zhou He, Yongjun Chen, Bo Ruan, Shuhan Yu, Junwen Zhou
The actual working environment temperature of the horizontal well tractor is too high, which leads to position sensor of general brushless DC motor (BLDCM) cannot work normally. Therefore, the position sensorless drive system is designed to overcome the problems caused by the position sensor in the actual working conditions. The principle of sensorless BLDCM work is introduced in detail, And drive system of Sensorless B

Jan 30, 2018Open    AccessArticle

Evolution of the Brazilian Electric Generation System and Its Exergetic Efficiency-Relations with Economics, Reviews and Projections

Marcus Vinicius da Silva Neves
In general, historically, Brazil is a country that does not develop a robust master plan for various areas responsible for supporting its development. As for the themes: education, transport, logistics, tourism, among others, the national infrastructure, in which the generation of electricity is a main character, does not have a strong planning and is pursued firmly that its actions come true. In addition, there is no clear driver

Dec 28, 2017Open    AccessArticle

Research on Permanent Magnet Synchronous Motor Driver System of Horizontal Well Tractor

Zhou He, Yongjun Chen, Shuhan Yu, Junwen Zhou, Yang Shen, Kuan Shi
Nowadays, horizontal well technology is being applied to the development of oilfield production capacity more and more. The horizontal well tractor can effectively solve the problem that the instrument can not get to the target layer by gravity. However, in actual conditions, Brushless DC motor (BLDCM) there is a large torque ripple problem, resulting in motor running is not smooth, vibration and noise is too large, can not meet t

Nov 23, 2017Open    AccessArticle

Study on Low Temperature Performance of Li Ion Battery

Kejie Wang
At low temperatures, especially when the temperature drops to -20 degrees, or even lower, the energy and power of lithium ion batteries are obviously decreased by [1] [2] [3] [4] [5]. In order to further grasp the lithium ion power battery charging characteristics at low temperatures and low temperature discharge performance test bench experiment simulates the low temperature environment, so as to ascertain the low charge discharg

Sep 14, 2017Open    AccessArticle

A New Strategy for BLDC Sensorless Control System and Its Application in Horizontal Well Tractor

Shuhan Yu, Yongjun Chen
The positionless brushless DC motor has the advantages of simple structure, good speed performance and high efficiency. It has become the best choice for horizontal well tractor. This paper introduces a set of brushless DC motor control system, gives the hardware structure of the system and brushless DC motor without Hall sensor control flow chart and the host computer communication interface protocol which solves the problem of p