A Novel Primary-Side Controlled Universal-Input AC–DC LED Driver Based on a Source-Driving Control Scheme

Chen, Yao; Chang, Changyuan; Yang, Penglin

doi:10.1109/tpel.2014.2359585

Cited by 38 publications

(8 citation statements)

References 29 publications

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“…In addition, switched-mode power supplies have a better efficiency, which varies between 65 and 90%. Contrarily, they have regulatory problems [19][20][21], which are more difficult to control. These power supplies produce a relatively large noise due to the rectangular signal to the switching frequency, which is rich in harmonics.…”

Section: Flyback Converter Descriptionmentioning

confidence: 99%

Time domain inverse method based on the near field technique to solve electromagnetic interference problems: application to an AC/DC flyback converter

Zitouna

Slama

2018

IET Power Electronics

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This study presents a time domain modelling method for sources of electromagnetic disturbance. For the identification of an equivalent model, the proposed method is based on the synchronised temporal measurements of the magnetic near field above a power electronic system. To determine the parameters of the model, the proposed methodology is combined with an optimisation method based on the genetic algorithms. Unlike the classical approaches developed in the frequency domain, the proposed method allows finding a valid equivalent model for all radiation frequencies of measured time signals. It also enables knowing the phase shift in time between the radiating sources. The proposed method is applied in order to find the equivalent radiating sources of an AC/DC flyback converter. The accuracy and precision of the proposed method are validated by the good agreement between the measured cartography of the magnetic near field and that calculated using the parameters of the developed model. Finally, the latter's parameters are used to predict the cartography of other components of the magnetic field, which will be compared with the measured cartography. The superposition of the results confirms that the identified equivalent sources can represent real sources in the studied structure.

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Section: Flyback Converter Descriptionmentioning

confidence: 99%

Time domain inverse method based on the near field technique to solve electromagnetic interference problems: application to an AC/DC flyback converter

Zitouna

Slama

2018

IET Power Electronics

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“…In recent years, the UHV LDMOS has been implemented in power electronics, Microelectromechanical systems (MEMS) domains, power management circuits, and internet of things (IoT) applications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The power management circuit is also an indispensable project of the internet of things.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic-Discharge-Immunity Impacts in 300 V nLDMOS by Comprehensive Drift-Region Engineering

2019

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Electrostatic discharge (ESD) events are the main factors impacting the reliability of Integrated circuits (ICs); therefore, the ESD immunity level of these ICs is an important index. This paper focuses on comprehensive drift-region engineering for ultra-high-voltage (UHV) circular n-channel lateral diffusion metal-oxide-semiconductor transistor (nLDMOS) devices used to investigate impacts on ESD ability. Under the condition of fixed layout area, there are four kinds of modulation in the drift region. First, by floating a polysilicon stripe above the drift region, the breakdown voltage and secondary breakdown current of this modulation can be increased. Second, adjusting the width of the field-oxide layer in the drift region when the width of the field-oxide layer is 5.8 μm will result in the minimum breakdown voltage (105 V) but the best secondary breakdown current (6.84 A). Third, by adjusting the discrete unit cell and its spacing, the corresponding improved trigger voltage, holding voltage, and secondary breakdown current can be obtained. According to the experimental results, the holding voltage of all devices under test (DUTs) is greater than that of the reference group, so the discrete HV N-Well (HVNW) layer can effectively improve its latch-up immunity. Finally, by embedding different P-Well lengths, the findings suggest that when the embedded P-Well length is 9 μm, it will have the highest ESD ability and latch-up immunity.

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“…High-brightness light-emitting diode (HB-LED) is widely applied to visible light communications, UV LED, transportation and so on, caused by the notable characteristics, such as high luminous efficiency, good optical performance, long lifetime, rich colour and environmental friendly [1][2][3][4]. The power rating of a single LED is generally around 3 W, and LEDs are connected in series or parallel to achieve brightness requirement [5].…”

Section: Introductionmentioning

confidence: 99%

Multi‐channel LED driver based on switched‐controlled capacitor with constant frequency control

Liu

Tian

Zeng

2018

IET Power Electronics

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Current sharing among light-emitting diode (LED) strings is significant for reliability and long life. The capacitive balancing was widely used with low losses and small volume. However, the capacitive balancing scheme adopting the impedance matching causes large circulating current, and its precision of current sharing is restricted due to impedance tolerance. In addition, the high reactive power with pulse frequency control brings high power stress on the volt-ampere rating (VAR) of the half-bridge switches and arouses heavy electromagnetic interference. In this study, the interleaved structure of the upper and lower half-bridge is proposed to alleviate the mismatching of capacitance impedance. Besides, the wide range of LED dimming capability is accomplished by using the switched-controlled capacitor (SCC) unit with the constant frequency of power switches. The circuit analysis, SCC modulation, current sharing, LED dimming and performance comparisons are examined in detail. All the superior performance of the proposed LED driver is verified by simulation prototype and experimental platform with four-channel LED strings and rated power of 23 W. The accordance of theoretical analysis, simulation waveforms and experiment results further confirms the feasibility of the proposed LED driver.

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A Novel Primary-Side Controlled Universal-Input AC–DC LED Driver Based on a Source-Driving Control Scheme

Cited by 38 publications

References 29 publications

Time domain inverse method based on the near field technique to solve electromagnetic interference problems: application to an AC/DC flyback converter

Time domain inverse method based on the near field technique to solve electromagnetic interference problems: application to an AC/DC flyback converter

Electrostatic-Discharge-Immunity Impacts in 300 V nLDMOS by Comprehensive Drift-Region Engineering

Multi‐channel LED driver based on switched‐controlled capacitor with constant frequency control

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