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Bridgeless interleaved boost PFC converter with variable duty cycle control
(2011-12-28)
This paper proposes a bridgeless boost interleaved PFC (power factor correction) converter with variable duty cycle control. The application of bridgeless technique causes reduction of conduction losses, while the interleaving ...
Bridgeless interleaved boost PFC converter with variable duty cycle control
(2011-12-28)
This paper proposes a bridgeless boost interleaved PFC (power factor correction) converter with variable duty cycle control. The application of bridgeless technique causes reduction of conduction losses, while the interleaving ...
Development of correlation equations between different measurements of skid resistance in pavements
(NATL INST SCIENCE COMMUNICATION-NISCAIR, 2006)
Friction is an indicator of the safety level supplied by a pavement. It is obtained by skid resistance and texture measures performed with static and high performance devices. Because the physical principle applied by each ...
Harmonic distortion in public low-voltage grids Comparison of the situation in Colombia and Germany
(Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ingeniería, 2015-06-01)
Current and voltage harmonic levels in LV grids depend not only on the harmonic emission of non-linear loads, but also on the characteristics of the grid and the voltage distortion of the upstream grid. Based on several ...
Redução de harmônicos de corrente em sistemas de iluminação à LEDs dimerizáveis
(Universidade Tecnológica Federal do ParanáPato BrancoBrasilDepartamento Acadêmico de ElétricaEngenharia ElétricaUTFPR, 2019-11-28)
The present study proposes solutions to reduce the current harmonics from a dimmable LED illumination system. The purpose is to find an efficient and cheap way to considerably reduce those. It begins with a theoretical ...
Harmonic solutions for polygonal hydraulic jumps in thin fluid films
(Cambridge Univ Press, 2015)
This article contains numerical and theoretical results on the circular and polygonal hydraulic jumps
in the framework of inertial lubrication theory. The free surface and velocity fields are computed
along with ...
Power performance evaluation of an electric home fan with triac-based automatic speed control system
(Imeko, 2009-01-01)
In order to provide a low cost system of thermal comfort, a common model of home fan, 40 cm diameter size, had its manual four-button control system replaced by an automatic speed control. The new control system has a ...
Power performance evaluation of an electric home fan with triac-based automatic speed control system
(Imeko, 2009-01-01)
In order to provide a low cost system of thermal comfort, a common model of home fan, 40 cm diameter size, had its manual four-button control system replaced by an automatic speed control. The new control system has a ...