scholarly journals THE EFFECT OF ENERGY-EFFICIENT LIGHT SOURCES ON THE QUALITY OF ELECTRICITY

2016 ◽  
Vol 1 ◽  
pp. 38-48
Author(s):  
Volodymyr Andriychuk ◽  
Mykola Lypovetskyi ◽  
Myroslav Nakonechnyi ◽  
Serhiy Potalitsyn
Keyword(s):  
Power Factor ◽  
Energy Efficient ◽  
Power Factor Correction ◽  
Light Sources ◽  
Current Harmonics ◽  
Light Emitting ◽  
Fluorescent Lamps ◽  
Sinusoidal Current ◽  
Relative Errors

The paper analyzes the range of current from energy-efficient light sources (LSs), such as compact fluorescent lamps (CFLs) and light-emitting diodes (LEDs). The studied LSs exceed the standard values for the current harmonics, even with passive power factor correction. We have developed a methodology for calculating relative errors of active energy meters that measure the energy used by CFLs and LEDs and applied the methodology to determine the values of the relative errors of the induction and the digital meters. It is found that the errors of of both types of electricity meters for measuring power in the circuits with the tested LSs–CFLs and LEDs–exceed the maximum permissible errors by 3.0 % and 4.0 % respectively. Thus, when the load is a source of non-sinusoidal current, a consumer is overcharged for electricity. The values of errors in electricity metering can be reduced by eliminating the causes of the deteriorating quality of electricity, i.e. by supplying the lighting installations with energy-efficient light sources provided with active power factor correction.

The Three-Level Sine-Wave Inverter with Power Factor Correction (PFC)

2015 ◽  
Vol 781 ◽  
pp. 402-405
Author(s):  
Napat Krachangchaeng ◽  
Sakorn Po-Ngam
Keyword(s):  
Power Factor ◽  
Output Voltage ◽  
Power Factor Correction ◽  
Sine Wave ◽  
Input Power ◽  
Small Current ◽  
Uninterruptible Power Supply ◽  
Current Harmonics ◽  
Electric Device ◽  
Uninterruptible Power

Nowadays, the uninterruptible power supply (UPS) is important in reliability for electric device. The UPS need high quality electricity. Therefore, the simulation of the three-level sine-wave inverter with power factor correction (PFC) is proposed in this paper. Moreover, the circuit’s guidelines of the active PFC controller in the active PFC and the sinusoidal output voltage are also presented. Validity of the proposed the three-level sine-wave inverter with the active PFC is confirmed by simulation. The simulation results show the very small current harmonics, the input power factor most nearly unity and constant output voltage when the suddenly step-load changed.

scholarly journals The influence of power electronic converter passive filter parameters for flicker in LED lighting

2018 ◽  
Vol 21 ◽  
pp. 00020
Author(s):  
Dariusz Sobczynski
Keyword(s):  
Power Systems ◽  
Supply Voltage ◽  
Current Source ◽  
Luminous Flux ◽  
Light Sources ◽  
Light Emitting ◽  
Current Voltage ◽  
Passive Filters ◽  
The Stability

The light emitting diodes (LEDs) are ever more used, and their price is getting lower year on year. Although, exchanging traditional light sources for the LED lamps does not seem to be complicated, we need to remember to maintaining high–quality of light. One of the aspects we should be worry about is a light’s flickering. Due to the shape of the current–voltage characteristics of the LED diode and their dependence on temperature, the value of the luminous flux – but also the lifetime – depends to a large extent on the stability of the supply voltage. Therefore, correct power system should be a thermally stable current source. Unfortunately, the simple power systems, equipped with passive filters are often used as cheap commercial solutions. In those types of systems stability of the output voltage is heavily dependent on the load conditions. Passive filters – usually consisting of coils and capacitors – are placed in the output circuit. This paper presents research carried out to show of filter capacitance influence on flickering phenomenon, and practical light’s flickering measuring technique for the LED lamps.

scholarly journals Effects of Different Colored LEDs on the Enhancement of Biologically Active Ingredients in Callus Cultures of Gynura procumbens (Lour.) Merr.

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4336 ◽  
Author(s):  
Thang Tung Lian ◽  
Se-Yeoun Cha ◽  
Myat Myat Moe ◽  
Yong Ju Kim ◽  
Keuk Soo Bang
Keyword(s):  
Liquid Chromatography ◽  
High Performance ◽  
Leaf Explants ◽  
Callus Cultures ◽  
Biologically Active ◽  
Naphthaleneacetic Acid ◽  
Light Sources ◽  
Light Emitting ◽  
Fluorescent Lamps ◽  
Wavelength Emission

Conventional fluorescent lamps that are used in tissue culture are costly light sources, exhibiting excessive wavelength emission-bandwidth that must be replaced by alternative, less costly, and much lower power-consuming energy sources. The use of Light-Emitting Diodes (LEDs) is the best option due to their potential role as elicitors of secondary metabolite production in many plant models. Gynura procumbens (G. procumbens) is widely used for treating various diseases. Here, leaf explants were cultivated in MS medium that was supplemented with 0.5 mg/L of naphthaleneacetic acid (NAA) and 2.0 mg/L of benzylaminopurine (BAP) for 30 days under white, blue, and red LEDs. Secondary metabolites were analyzed by High Performance Liquid Chromatography (HPLC) and Liquid Chromatography-Mass Spectrometry (LC-MS). Blue LEDs elicited the highest antioxidant activity, total flavonoid, and phenolic content. Furthermore, the content of cyanidin-monoglucosides significantly increased under blue light.

Light Emitting Diode Technology: Lowering Build and Maintenance Costs

2013 ◽  
Author(s):  
Roger Buelow ◽  
Keith Kazenki ◽  
Greg Flies
Keyword(s):  
Energy Efficient ◽  
Light Emitting Diode ◽  
Efficient Technology ◽  
Maintenance Costs ◽  
Light Emitting ◽  
Fluorescent Lamps ◽  
Feasible Option ◽  
Energy Efficient Technology

Due to the recent push for energy efficient technology, LEDs have developed to be able to meet and surpass fluorescent lamps in terms of efficiency and lifetime. Additional focus on LEDs has allowed the initial investment price to decrease allowing LEDs to become a feasible option. Installing LEDs during the construction of ships allows for a greater TOC savings from increased energy efficacy, lower maintenance costs and a simpler electrical design schematic. There are three options available to incorporate LEDs on a ship: LED lamps, LED fixtures or a combination of the two.

Supply Power Factor Improvement in Ozone Generator System Using Active Power Factor Correction Converter

2015 ◽  
Vol 6 (2) ◽  
pp. 326 ◽  
Author(s):  
G. Udhayakumar ◽  
Rashmi M R ◽  
K. Patel ◽  
G.P. Ramesh ◽  
Suresh A
Keyword(s):  
High Voltage ◽  
Power Factor ◽  
High Frequency ◽  
Active Power ◽  
Ozone Generator ◽  
Generator System ◽  
Current Harmonics ◽  
Pwm Inverter ◽  
Sinusoidal Current ◽  
Power Factor Improvement

<p>Artificial Ozone Generating system needs High Voltage, High Frequency supply. The Ozonator distorts the supply currents and henceforth affect the supply power factor. This paper presents the performance comparison of PWM inverter to Power Factor Corrected (PFC) converter with PWM inverter based High-voltage High-frequency power supply for ozone generator system. The conventional inverter has front end bridge rectifier with smoothing capacitor. It draws non-sinusoidal current from ac mains; as a result input supply has more harmonics and poor power factor. Hence, there is a continuous need for power factor improvement and reduction of line current harmonics.  The proposed system has active power factor correction converter which is used to achieve sinusoidal current and improve the supply power factor. The active PFC converter with PWM inverter fed ozone generator generates more ozone output compared to the conventional inverter. Thus the proposed system has less current harmonics and better input power factor compared to the conventional system.  The performance of the both inverters are compared and analyzed with the help of simulation results presented in this paper.</p>

The Prototype Implementation of Interleaved Based PFC Rectification Light Emitting Diodes Systems for Low Power Applications

2020 ◽  
Vol 12 (4) ◽  
pp. 499-505
Author(s):  
J. Stanly Jones ◽  
S. Sutha ◽  
R. Saravanan
Keyword(s):  
Low Power ◽  
Power Factor ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Power Factor Correction ◽  
Low Cost ◽  
Prototype Implementation ◽  
Matlab Simulink ◽  
Light Emitting ◽  
Switching Controller

This proposed topology presents the interleaved boost AC–DC rectification for power factor correction. This topology operating at CCM. It has low semiconductor components, low cost, less complexity and it has low ripple voltage. It's PF reach to high at AC side and also has high efficiency and reduced harmonics. This AC–DC rectifier controlled with a PID switching controller which is used to a utilized laptop and mobile charging applications. This topology verified by Matlab Simulink and bridgeless topology LED electronics prototype kit has tested and verified.

A Prototype Based on Sensors with Power Factor Correction Rectification for Light Emitting Diode Street Lighting Systems

2019 ◽  
Vol 17 (10) ◽  
pp. 755-761
Author(s):  
J. Stanly Jones ◽  
S. Sutha
Keyword(s):  
Power Factor ◽  
Power Factor Correction ◽  
Light Emitting Diode ◽  
Street Lighting ◽  
Minimum Requirement ◽  
Current Harmonics ◽  
Touch Sensor ◽  
Switching Losses ◽  
Zero Current Switching ◽  
Lighting Systems

This paper introduced new topology of sensors signal based power factor correction for street lighting systems. This class-E rectifier based on zero-current switching, to increase the bridge diode current and reduced the current harmonics, furthermore the proposed converter reduced switching losses and its noise are also reduced by this proposed system. And important of the sensor-based this system used LDR sensor and a touch sensor that type of sensors used for street lighting systems. This proposed prototype topology has the minimum requirement of passive components and power switches, it has high power factor. Finally, Simple prototype hardware tested and verified.

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