The study of harmonics from dimmable LED lamps, using CompactRIO

Rata, Gabriela; Rață, Mihai

doi:10.1109/daas.2016.7492570

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…Once the building was equipped and light emitting diode (LED) luminaires installed significant distortion of the supply occurred. LED lights especially appear to contribute significantly to THD [17], [18]. In Fig.…”

Section: Pq Case Studymentioning

confidence: 93%

Versatile High-Sample Frequency Power Quality Measurement Device

Matthee

Moonen

Leferink

2020

2020 IEEE International Symposium on Electromagnetic Compatibility &Amp; Signal/Power Integrity (EMCSI)

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Rapidly advancing technology has seen the adoption of non-linear loads which may be considered improving efficiency and decreasing cost. Unfortunately this advance of technology often exceeds the measures to control the unforeseen effects of systems or unwanted interference between multiple manufacturer's devices. In this paper a relatively modern building, with a common experience of conducted electromagnetic interference including power quality problems such as harmonic distortion of the supply, is discussed. A system is developed to monitor the power quality of the mains in various locations and aid in identifying the extent of the electromagnetic interference. With high sampling frequency and synchronising of measurement data between various locations accurate within millisecond scale in the power distributed user network, the extent of conducted emission events especially sub millisecond range, is analysed.

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Section: Pq Case Studymentioning

confidence: 93%

Versatile High-Sample Frequency Power Quality Measurement Device

Matthee

Moonen

Leferink

2020

2020 IEEE International Symposium on Electromagnetic Compatibility &Amp; Signal/Power Integrity (EMCSI)

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“…Papers [21,22] present the control systems for power LEDs supplied from the power grid. The PWM technique is used to control the lighting emitted by the LEDs.…”

Section: Introductionmentioning

confidence: 99%

An Influence of Parameters of the Control Signal of Power LEDs on Their Junction Temperature and Emitted Light

Górecki,

Ptak,

Gensikowski

2023

Energies

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This article presents the method of implementation and the results of experimental investigations illustrating an influence of parameters of the signal controlling the current flowing through power LEDs on their junction temperature and on parameters characterizing the light emitted by them. The measurement system used and the tested power LEDs are described. The results of measurements of the junction temperature of the tested devices, the values of the average value of the power dissipated in the tested devices and the photometric and radiometric parameters of these devices obtained for different values of frequency and the duty cycle of the signal controlling the current flowing through the tested diodes are presented and discussed. It is shown that the operation of the considered semiconductor devices is more effective at low frequency values. The possibility of adjusting the optical parameters of the power LEDs in the considered range of frequency and the duty cycle adjustment is assessed. Additionally, the measured waveforms of the current supplying the tested LEDs is shown. The influence of the parasitic capacitances of the tested devices is discussed. On the basis of the obtained investigation results, some recommendations for the designers of lighting systems can be formulated. In order to obtain an almost linear dependence of the illuminance on the duty cycle, the values of frequency not exceeding 10 kHz should be used.

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“…High efficiency enables a low consumption of electrical energy. However, in most cases, the efficiency of LED drivers is low [20][21][22][23][24], and they cause harmonics in the input current and a low power factor [25][26][27]. The proposed LED driver has overcome these THD and power factor issues.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of an Efficient Bicolor LED Driving System

Ferdous

Rashid

2022

Electronics

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There are some challenges involved in the design of a multicolor LED driver, such as the precise control of color consistency, i.e., maintaining the correlated color temperature (CCT) and luminous intensity. CCT deviation causes a color shift of composite light. This paper approaches the method of nonlinear optimization of the LED currents of two LED sources to achieve the desired CCT. A bicolor blended-shade white LED system is formed by using a warm color LED source of 1000 K CCT and a cool color LED source of 6500 K CCT. By using a nonlinear optimization methodology, the reduced deviation of the blended CCT and optimum LED currents are obtained. The optimized currents in the two LED strings are maintained by the control circuit of the single-ended primary inductor converter (SEPIC). The obtained reduced deviation of the CCT is 43 K, and the precision is 99.15%. Again, harmonics in the input current hamper power quality, i.e., reduce the power factor and increase power loss. This paper proposes the harmonic reduction technique to achieve the lowest value of total harmonic distortion (THD) through the nonlinear parametric optimization of the SEPIC. Measured THD = 4.37%; PF = 0.96; and efficiency = 92.8%. The system stability was determined and found to be satisfactory.

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The study of harmonics from dimmable LED lamps, using CompactRIO

Cited by 9 publications

References 5 publications

Versatile High-Sample Frequency Power Quality Measurement Device

Versatile High-Sample Frequency Power Quality Measurement Device

An Influence of Parameters of the Control Signal of Power LEDs on Their Junction Temperature and Emitted Light

Design Optimization of an Efficient Bicolor LED Driving System

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