High-Efficiency Resonant LED Backlight Driver With Passive Current Balancing and Dimming

Liu, Xueshan; Zhou, Qun; Xu, Jianping; Lei, Yong; Wang, Peng; Zhu, Yingwei

doi:10.1109/tie.2017.2777381

Cited by 20 publications

(17 citation statements)

References 21 publications

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“…For dimming headlights by using analog modulation (analog dimming), the LED driving current is adjusted to vary its brightness . For dimming headlights by using PWM (PWM dimming), the turn‐on and turn‐off times of the LED operation can be controlled using a periodical PWM signal, and the LED is driven by a constant current (CC) during the LED turn‐on time . In this study, the method of PWM adjustment OP could be applied for the laser headlight driving controller (LHDC); from low to high temperatures, the PWM‐adjusted OP variations, and the electro‐optic conversion efficiencies of laser diodes, could be measured and recorded.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, the method of PWM adjustment OP could be applied for the laser headlight driving controller (LHDC); from low to high temperatures, the PWM‐adjusted OP variations, and the electro‐optic conversion efficiencies of laser diodes, could be measured and recorded. However, the aforementioned circumstances have not been discussed in …”

Section: Introductionmentioning

confidence: 99%

“…However, the aforementioned circumstances have not been discussed in. [14][15][16][17] In the present study, a high-OP laser diode (PL TB405B, Osram Opto Semiconductors Inc., Regensburg, Germany) was used as the light source of a headlight. According to the measurement data presented in Hanna and Alfons 18 , at different driving currents, the OP variation in a laser diode is proportional to its forward driving current.…”

Section: Introductionmentioning

confidence: 99%

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Development and implementation of a laser headlight system for electro‐optic characteristic measurement and comparison

Lin

Pai

Chen

2020

Circuit Theory & Apps

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Summary In this study, a laser headlight driving controller (LHDC) using the controller area network (CAN)‐bus communication system was developed and implemented for vehicle headlight applications. To observe temperature variations that influence the forward‐bias voltage and optical power of laser diodes, the laser diode was placed in an ambient temperature‐testing chamber to measure the electro‐optic characteristics and calculate the electro‐optic conversion efficiencies. The optical power and conversion efficiency values obtained at different temperatures (from negative to positive temperatures) when optical power adjustment was executed using analog and pulse‐width modulation technologies were compared. Moreover, a human‐machine operating interface was developed using the LabVIEW software. Therefore, the LHDC and laser optical power can be controlled using a computer through the CAN‐bus communication system to control the LHDC and monitor it.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development and implementation of a laser headlight system for electro‐optic characteristic measurement and comparison

Lin

Pai

Chen

2020

Circuit Theory & Apps

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“…Due to these advantages, LEDs are penetrated into lighting applications such as domestic, automotive, signalling, LED back-lighting etc. [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Input voltage controlled full‐bridge series resonant converter for LED driver application

Kolla

Vishwanathan

Murthy

2020

IET power electron.

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In this study, a phase shift controlled full-bridge series resonant converter (SRC) integrated with buck converters for light-emitting diode (LED) driver application is proposed. This LED driver supplies four LED loads simultaneously. The current through LED loads is controlled by phase shift control of the SRC, and its output is added to the input voltage. Zero-voltage switching (ZVS) switching of all the switches is achieved by operating the SRC at lagging power factor for all input voltage variations. As the only part of the output power is processed through the SRC and all the switches operating with ZVS, the efficiency of the converter is 95.7%, which is high. A 142 W LED driver is designed, and its performance is tested with PSPICE simulations and experimental prototype.

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“…For LED dimming by using average current modulation, the average driving current of the LED was regulated [14]. For dimming LEDs by using PDCM, using a periodical PDCM signal, the turn-on/-off operation of the LED can be controlled, an the LED was driven by a maximum constant current (CC) during the LED turn-on operation [15][16][17]. Table 2 provides comparisons of technologies for analog dimming and PDCM dimming presented in [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Employing a Laser Headlight Electrical System to Measure and Calculate Electro-Optic Conversion Efficiencies of Blue-Beam Laser Diodes

2020

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In this study, a laser headlight electrical system was developed and implemented to measure and compare the electro-optic characteristics of the blue-beam laser diodes (BBLDs). To observe different temperatures (from negative to positive temperatures) that cause optical output power (OOP) and electrical power variations of the BBLDs, BBLDs were placed in an ambient temperature testing chamber, and the electro-optic characteristics of the BBLDs were measured to estimate the electro-optic conversion efficiencies. The different OOPs and electro-optic conversion efficiencies at different temperatures can be obtained when OOP adjustment was performed by average current and low-frequency pulse-duty cycle modulation technologies. Moreover, this study developed a human–machine interface using the LabVIEW software; therefore, the laser headlight electrical system can be controlled and monitored by a computer with the controller area network (CAN) bus communication. Finally, the prototype of the laser headlight electrical system was achieved, and three BBLDs were driven; furthermore, the white light of the headlight can be produced by mixing blue laser beams with a yellow fluorescence ceramic wafer.

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High-Efficiency Resonant LED Backlight Driver With Passive Current Balancing and Dimming

Cited by 20 publications

References 21 publications

Development and implementation of a laser headlight system for electro‐optic characteristic measurement and comparison

Development and implementation of a laser headlight system for electro‐optic characteristic measurement and comparison

Input voltage controlled full‐bridge series resonant converter for LED driver application

Employing a Laser Headlight Electrical System to Measure and Calculate Electro-Optic Conversion Efficiencies of Blue-Beam Laser Diodes

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