Proposing Measures of Flicker in the Low Frequencies for Lighting Applications

Lehman, Brad; Wilkins, Arnold J.; Berman, S.M.; Poplawski, Michael; Miller, Naomi

doi:10.1582/leukos.2010.07.03004

Cited by 21 publications

(22 citation statements)

References 8 publications

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“…However, not all frequency components are equally harmful for humans, and only those below 3 kHz can be considered as such. In fact, whether the low frequency modulation is visible or invisible, it can trigger headaches, migraines, fatigue, epilepsy or any other neurological response [20].…”

Section: Cmentioning

confidence: 99%

“…Therefore, the flicker recommendation truly sets the limits on the allowed amplitude of the luminance and as such, the size of the output capacitance. For that matter, two simple metrics were defined in order to give a measure of flicker [20]: -Flicker index [21] is defined as the area above the line of average luminance (i.e., L dc ) divided by the total area of the light output curve during a cycle, refer to Fig (1)…”

Section: Cmentioning

confidence: 99%

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A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

Castro

Vázquez

Arias

et al. 2019

IEEE Trans. Power Electron.

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Light-Emitting Diodes (LEDs) are coming strongly into the lighting market due to their advantages over conventional lighting solutions: energy efficient, controllable in both light and color, long lifetime, lack of a warm-up period and high power density. Some of these advantages will make LED light sources to be more than just a lightbulb, being able to transmit data, control light color, hue and intensity or even detect people in indoor environments. Nevertheless, these advantages attributed to LED capabilities are, in reality, achieved thanks to the LED driver. The present work reviews the current stateof-the-art strategies to drive LEDs from ac power grids with special emphasis into removing the most limiting component from the point of view of the lifetime, which is the electrolytic capacitor, while achieving a flicker-free performance of the light output of the LED driver. Moreover, it focuses on analyzing the required regulations, challenges and applicability of LED drivers in both single-phase and three-phase ac power grids.Note: This only applies for certified dimmable luminaires. Audible noiseLuminaire shall not emit noise above 24 dBA at 1 meter or less at the minimum output.0885-8993 (c)

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Section: Cmentioning

confidence: 99%

Section: Cmentioning

confidence: 99%

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

Castro

Vázquez

Arias

et al. 2019

IEEE Trans. Power Electron.

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show abstract

“…The voltage transfer characteristics of the FRF and DFRF were obtained by substituting the parameters in Table 2 into Equation (13) and Table 3 into Equation (14), as demonstrated in Figure 9. In this figure, the resonant peak value at the resonant point significantly decreases, and the transfer speed of the filter theoretically accelerates when the capacitance branch is added to the resistor.…”

Section: Sensitivity Analysis Of Filter Parametersmentioning

confidence: 99%

“…The root locus and Nyquist curves for the voltage transfer function of the filter were drawn in MATLAB using Equation (13), as demonstrated in Figure 12. In this figure, all closed-loop poles are located in the left-half plane, and Nyquist curves do not pass through (−1, j0), thus indicating that the filtering system is stable.…”

Section: Dynamic Performance Analysis Of the Filtermentioning

confidence: 99%

“…A large variation in the DC link voltage can lead to the efficiency and performance degradation of its downstream converters [11], and increased voltage stresses of the system [12] and interference between the DC and AC utilities due to the coupling effect. For specific applications, this variation can also generate undesirable flickers in light emitting diode (LED) lighting [13], decrease the operating lifetime of batteries [14], and diminish the power efficiency of photovoltaic (PV) panels [15]. A large voltage ripple across the electrolytic capacitor (E-cap) leads to a massive capacitor current ripple, increasing the internal resistive loss and temperature inside the E-Cap [16].…”

Section: Introductionmentioning

confidence: 99%

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Design of Low-Ripple and Fast-Response DC Filters in DC Distribution Networks

2018

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The design and parameter selection of low-ripple and fast-response direct current (DC) filters are discussed in this study with the aim of alleviating the influence of a DC-side low-frequency voltage pulsation on a sensitive load in a DC distribution network. A method for determining the DC filter parameters by using a mofatching most flat response algorithm is presented. The voltage transfer function of the DC-side filter in the DC distribution network is deduced to analyze its voltage transfer characteristics. The resonance peak value of the filter network is an important factor affecting the transfer speed of a filter. A pole-circle-based parameter optimization method is proposed to move the poles of the filter transfer function down and to the left of pole plane for finding the appropriate capacitance, inductance, and damping parameters. This approach effectively restricts the resonance peak value, accelerates the transfer speed, and maintains steady filtering results. Simulation and test results verify that the filter has low resonance value, rapid convergence ability, and an excellent filtering effect.Energies 2018, 11, 3128 2 of 20 into two categories: active power filtering (APF) [19][20][21][22][23] and passive power filtering (PPF) [24][25][26][27][28][29]. APF can eliminate DC voltage fluctuation dynamically by paralleling the voltage converter on the DC side. For example, Wang et al. [20] proposed eliminating harmonics in the DC bus voltage with a DC electric spring. This approach adjusts the consumption power of a non-critical load to make it follow the power variation of renewable energy. However, the ability of this method to eliminate voltage harmonics is limited considering the restricted power of non-critical loads. In Li et al. [19], a pluggable voltage pulsation suppression device was designed to realize flexible control of the voltage ripple in an AC/DC hybrid distribution network. However, adding a device at each node evidently increased the cost of investment. Lee et al. [21] suggested suppressing DC voltage pulsation using an energy storage device in the DC distribution network and controlling the converters. However, the control method is complex and the operation and maintenance costs of the energy storage device are high. In Li et al.[23], a ripple eliminator, which is a bidirectional buck-boost converter terminated with an auxiliary capacitor, was adopted to replace bulky capacitors in DC systems. Although the APF is effective at eliminating voltage harmonics, designing and controlling DC APF is complex and costly [22]. In addition, APF is rarely used in DC distribution networks with large capacity and high voltage given its limitations. The DC passive filter design is simple without the additional of a controller, acting as the main DC voltage filter in the DC distribution network. DC passive filters are mainly divided into tuned and low-pass filters. The former has a large occupational area and minimal flexibility [27]. The latter can filter the harmonics after a cut-off frequency...

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Flicker-free single-stage LED drivers based on load current feedback strategy

Zhou

Lou

et al. 2023

J. Power Electron.

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Proposing Measures of Flicker in the Low Frequencies for Lighting Applications

Cited by 21 publications

References 8 publications

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

Design of Low-Ripple and Fast-Response DC Filters in DC Distribution Networks

Flicker-free single-stage LED drivers based on load current feedback strategy

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