A Series Resonant Converter-Based Multichannel LED Driver With Inherent Current Balancing and Dimming Capability

Gücin, Taha Nurettin; Fincan, Bekir; Biberoğlu, Muhammet

doi:10.1109/tpel.2018.2838261

Cited by 25 publications

(11 citation statements)

References 22 publications

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“…where PNCMcon and PCCMcon are the proposed and conventional MOSFET conduction losses of conventional converter, respectively. The MOSFET conduction loss can be compared using (14), (18), (19), and (20). Fig.…”

Section: Ncmentioning

confidence: 99%

Resonance-Based Optimized Buck LED Driver Using Unequal Turn Ratio Coupled Inductance

Sangrody

Pouresmaeil

Marzband

et al. 2020

IEEE Trans. Power Electron.

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Losses in light-emitting-diode (LED) driver cause increasing temperature and shorten their lifespan. Therefore, improving the efficiency of LED drivers not only saves energy but also is indispensable to increase their lifespan. In this study, a new LED driver topology is proposed to improve the performance of valley switching by decreasing the MOSFET switching losses. The proposed topology is designed in a way that the MOSFET works at the significantly lower switching and conduction losses in compared with conventional LED drivers. It elaborates how the proposed topology also improves the overall efficiency by decreasing power losses in other main elements of the driver including inductance, and diode. In addition, a new valley switching implementation is introduced for the new converter which decreases the cost and dimension of the LED drivers. The experimental results confirm the high efficient operation of the proposed LED driver by reaching the efficiency up to 97% at a wide range of operating voltage.

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Section: Ncmentioning

confidence: 99%

Resonance-Based Optimized Buck LED Driver Using Unequal Turn Ratio Coupled Inductance

Sangrody

Pouresmaeil

Marzband

et al. 2020

IEEE Trans. Power Electron.

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“…Accordingly, the passive method is presented based on circuit features to achieve the current balance. This method can be classified into two types: differential-mode transformer [8][9][10] and capacitor [11][12][13][14][15]. Both types generally belong to the SIMO structure, different from single-input single-output (SISO).…”

Section: Introductionmentioning

confidence: 99%

“…The authors in [14] use resonant current balance module to realize capacitive current balance as well as zero-voltage-switching (ZVS) turn-on, but the number of resonant components and switches is increased if the number of outputs increased. The study in [15] utilizes the inherent features of the halfbridge series resonant converter to achieve capacitive current balance and dimming, but the current sharing error percentage is large. In addition, the experimental step-up voltage gains used in the studies [11][12][13] and the experimental step-down voltage gains used in [14,15] are not so good.…”

Section: Introductionmentioning

confidence: 99%

Development of Four-Channel Buck-Type LED Driver with Automatic Current Sharing

2021

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A buck-type light-emitting diode (LED) driver is proposed herein. The proposed LED driver automatically possesses current sharing and high step-down voltage gain. Without complex control, the proposed LED driver, with a single input and multiple outputs, can achieve automatic current sharing of four-channel LED strings, even under the different number of LEDs of each LED string. Furthermore, as compared with the traditional four-phase interleaved buck converter with a single input and a single output having current sharing required, the proposed circuit has the duty cycle up to 0.5, not 0.25, meaning that under the same input voltage the latter has a wider output voltage range than that of the former. Above all, if the proposed circuit with N outputs, then it still has the duty cycle up to 0.5, not one over N as shown traditionally. Moreover, as compared with the current sharing based on the differential-mode transformer, the proposed circuit has no magnetic resetting loop required. In this paper, the operating principles and design considerations of the proposed converter are discussed. Finally, the theoretical analyses and performances of the proposed LED driver are verified by simulation and experiment.

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“…The proposed driver can be extended for many channel LEDs by adding fewer diode components and increasing the number of secondary windings. In order to overcome the efficiency degradation and to drive multi-channel LEDs, a single power conversion driver has been studied from the PFC DC output to the LED current control [7][8][9][10][11][12][13][14][15][16][17]. The single power LED driving circuit can be divided into a conventional pulse-width modulation (PWM) DC-DC converter [7][8][9][10][11][12] and a resonant converter [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

High Voltage, Low Current High-Power Multichannel LEDs LLC Driver by Stacking Single-Ended Rectifiers with Balancing Capacitors

2020

Electronics

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In this paper, a new LLC converter for series-connected, high-voltage LEDs is proposed. The proposed LLC converter consists of two stacked, single-ended rectifiers and one balancing capacitor, to compensate for the current deviation of two individual LED strings. The proposed LLC LED driver can use a diode with low voltage stress, even if the secondary LED is connected in series to have a high driving voltage. In addition, even if several series-connected LEDs are changed into two-stacked structures, the balancing capacitor can compensate for the current deviation of the two separated LEDs, as well as the difference in leakage inductance of the two stacked single-ended rectifiers. The balancing capacitor can be made equal to the voltage tolerance of the stacked, single-ended rectifier diodes. The proposed circuit can be easily extended to a series channel LED driver circuit, without increasing the voltage stress. To verify the characteristics and operation of the proposed LLC LED driver, a 260W high-power LED driver is implemented.

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A Series Resonant Converter-Based Multichannel LED Driver With Inherent Current Balancing and Dimming Capability

Cited by 25 publications

References 22 publications

Resonance-Based Optimized Buck LED Driver Using Unequal Turn Ratio Coupled Inductance

Resonance-Based Optimized Buck LED Driver Using Unequal Turn Ratio Coupled Inductance

Development of Four-Channel Buck-Type LED Driver with Automatic Current Sharing

High Voltage, Low Current High-Power Multichannel LEDs LLC Driver by Stacking Single-Ended Rectifiers with Balancing Capacitors

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