A universal-input high-power-factor LLC resonant driver without electrolytic capacitor for PWM dimming LED lighting application

Yang, Jian‐Bo; Al-Naemi, Faris; Zhang, Weiping; Liu, Yuanchao; Chen, Xiaoping

doi:10.1109/peac.2014.7038082

Cited by 8 publications

(2 citation statements)

References 3 publications

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“…This feature has made the driving of HB-LEDs from the mains an important research topic in a wide range of power [1]. For this reason, it is required the use of an ac-dc converter that feeds the string of HB-LEDs with either a constant [2] or a low-frequency pulsed current in the range of hundreds to thousands of kHz [3]. In fact, for output powers higher than 25 W it needs to be able to achieve Power Factor Correction (PFC) [4].…”

Section: Introductionmentioning

confidence: 99%

A Family of High Frequency AC-LED Drivers Based on ZCS-QRCs

Castro

Lamar

López

et al. 2018

IEEE Trans. Power Electron.

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Abstract-A family of dimmable AC-LED drivers fed from dc voltages, is presented in this paper based on Zero Current S witching Quasi-Resonant Converters (ZCS -QRCs). The proposed family of drivers is based on replacing the diode in conventional converter topologies (i.e. buck, boost or buck-boost) by a string of High-Brightness Light-Emitting Diodes (HB-LED). Hence, the HB-LED string will be working as the rectifier diode and the load, switching at the same frequency of the main switch. In this case, the output current, which is experimentally validated, shows a negative current peak due to the reverse-recovery effect of the HB-LEDs. In order to reduce the reverse-recovery effect on the HB-LEDs, the main switch of the proposed topologies is replaced with a full-wave resonant switch, which makes possible to reduce the di/dt during the turn-off of the HB-LED string, therefore the reverse recovery effect is eliminated. Moreover, the dimming of the HB-LEDs is done by means of changing the switching frequency of the converter, by varying the turn-off while keeping a constant turn-on time. The proposed converters are suggested to be used in a post-regulator stage of an ac-dc converter or as the interface between the low voltage bus and the HB-LED string in a dc nanogrid. In order to validate the analysis, the proposed topologies have been experimentally tested on a constructed prototype with an output power of 7.5 W, that is able to achieve an electrical efficiency of 94.5% and a luminous efficacy of 110 lm/W at full load. Moreover, the analysis has been extended to a comparison in terms of reliability with the conventional topologies on a 700 h test.

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Section: Introductionmentioning

confidence: 99%

A Family of High Frequency AC-LED Drivers Based on ZCS-QRCs

Castro

Lamar

López

et al. 2018

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

show abstract

“…This feature has made the driving of HB-LEDs from the mains an important research topic for a wide range of power [1]. For this reason, it is required the use of an ac-dc converter, specifically for output powers higher than 25 W it needs to be able to achieve Power Factor Correction (PFC), that feeds the string of HB-LEDs with either a constant [2] or a low-frequency pulsed current in the range of hundreds to thousands of kHz [3]. Traditionally, an ac-dc HB-LED driver, when cost is not the main concern and reliability and efficiency are of more importance, uses a two-stage [4] or three-stage [5] approach.…”

Section: Introductionmentioning

confidence: 99%

High frequency dc-dc AC-LED driver based on ZCS-QRCs

Castro

López

Martin

et al. 2017

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract-A boost dc-dc dimmable AC-LED driver is presented in this paper based on Zero Current S witching QuasiResonant Converters (ZCS -QRCs). The proposed driver is based on replacing the diode in conventional converter topologies (i.e. buck, boost or buck-boost) by a string of High-Brightness LightEmitting Diodes (HB-LED). Hence, the HB-LED string will be working as the rectifier of the converter switching at the same frequency of the main switch. In this case, the output current, which is experimentally validated, shows a negative current peak due to the reverse recovery effect of the HB-LEDs. In order to reduce said effect on the HB-LEDs, the main switch of the proposed topologies is replaced with a full-wave resonant switch, which makes possible to reduce the di/dt during the turn-off of the HB-LED string, therefore the reverse recovery effect is minimized. Moreover, the dimming of the HB-LEDs is done by means of changing the switching frequency of the converter by varying the turn-off, while keeping a constant turn-on time. The proposed driver is suggested to be used in a post-regulator stage of an ac-dc converter or as the interface between the low voltage bus and the HB-LED string in a dc nanogrid. In order to validate the analysis, the proposed topologies have been experimentally tested on a dcdc, AC-LED, ZCS -QRC, boost converter with an output power of 7.5 W constructed prototype, that is able to achieve a luminous efficacy of 110 lm/W at full load

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