Abstract: This work is based on use of LED multiplexing. With this technique, it is possible to use a smaller number of pins of a microcontroller to energize the same number of LED. We explored the retinal persistence. It is a physiological property of the human eye. Due to this property, the human eye retains the captured image on the retina during a short time interval. Using the retinal persistence, it is possible to use multiplexing techniques to minimize the number of the microcontroller pins used and the energy consumed by the circuit. Instead of using multiplexing to switch the power among different displays, multiplexing was used also among the seven segments of a single display. Next, we combined more than one display on the same circuit. A prototype was developed and achieved up to 65% energy savings without perceptible loss of display quality

• Publication Date: 11-Oct-2015
• DOI: 10.15224/978-1-63248-064-4-03
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Abstract: One of the power system problem is reducing the quality due to using semiconductor devices, that should be compensate. With regarding to compensation, different compensator exist, that one of is passive filter(LCL).One of aspects of power quality is voltage or current harmonic distortion, that THD(Total Harmonic Distortion) was used for obtaining it. Obtaining of optimized parameters of filter (L,C) is more effective on reducing the THD. In this paper Frog- Leaping and Chaos optimization algorithms on obtaining of L and C and reducing of THD were used simultaneity.

• Publication Date: 11-Oct-2015
• DOI: 10.15224/978-1-63248-064-4-04
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