A Flicker-Free Single-Stage Offline LED Driver With High Power Factor

Peng, Fang Zheng; Liu, Yanfei; Sen, P.C.

doi:10.1109/jestpe.2015.2436390

Cited by 71 publications

(9 citation statements)

References 30 publications

(16 reference statements)

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“…To reduce the power processed by the parallel auxiliary circuit, in approach T5(b) in Fig. 22, a three-mode switch is added to the system [159], [162]. When the input power is higher than the power needed by the LED module, C B .…”

Section: ) Type 5 -Ac-supplied Auxiliary-power-decoupling-circuit-bas...mentioning

confidence: 99%

LED Systems Applications and LED Driver Topologies: A Review

et al. 2023

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High-power light-emitting diodes (LEDs) and high-brightness LEDs have revolutionized the lighting industry. The availability of cost-effective LEDs with high luminous flux, efficacy, and reliability has expanded their application to replace incandescent and fluorescent light sources. They have also enabled many new applications that were considered infeasible before, due to the inherent limitations of traditional sources of light. This survey provides a comprehensive overview of ac-and dc-supplied LED lighting systems and their applications, corresponding specifications and their similarities to/differences from regular power supplies. Restrictions imposed by LEDs characteristics, safety considerations, and dimmers are discussed. Also, LED driving approaches are categorized and their suitability for different applications is provided.

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Section: ) Type 5 -Ac-supplied Auxiliary-power-decoupling-circuit-bas...mentioning

confidence: 99%

LED Systems Applications and LED Driver Topologies: A Review

et al. 2023

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“…The bidirectional converter, on the other hand, has to process the power twice, which makes the driver less efficient. A DC‐DC converter is used to fix the PFC converter in Camponogara et al 12 and Fang et al 20 so that the LED is less affected by the output voltage ripple, as seen in Figure 3.…”

Section: Introductionmentioning

confidence: 99%

“…However,the topologies stated in Camponogara et al 12 and Fang et al 20 are only weakly coupled, which increases the complexity of the control approach. Another

n_{χ}

‐power stage (PS) driver design based on a unidirectional power processing technique was proposed in earlier studies 21–24 .…”

Section: Introductionmentioning

confidence: 99%

Electrolytic capacitor‐less reduced power processing single‐phase LED driver with power decoupling using split capacitor

Pallapati

Chinthamalla

2023

Circuit Theory & Apps

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Summary Light emitting diode (LED) driver systems are now moving toward reduced processing power to improve conversion efficiency in indoor and outdoor applications. LED drivers connected to a single‐phase supply must meet the requirements for power factor correction with lower input current harmonics to maintain the alternating current (AC) power grid's quality and maintain a constant current through the LED load to eliminate the flickering effect in the light output. An LED driver is required to fulfill these requirements. In this paper, a new reduced processing power LED driver is proposed. By splitting the output capacitor into two capacitors and with the help of hardware design, the processing power can be reduced by using fewer semiconductors than in earlier designs. The proposed driver employs a simple ripple cancellation control approach to eliminate the 100 Hz ripple in the LED load current. Using this principle, an LED driver was designed and tested. The experimental results demonstrated that the proposed LED driver achieved an input power factor close to unity with lower input current harmonics and 92.5% of peak efficiency when operating at full power.

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“…The ac-grid-fed electronic systems demand more power converter stages to maintain the PF and provide the regulated output power. [8][9][10] Further, electrolytic capacitors (ECs) are required to cope with the ac-dc power imbalance. 11 Due to more power conversion stages, the number of components can increase; hence, the efficiency decreases, and the size of the overall driver increases.…”

Section: Introductionmentioning

confidence: 99%

“…Further, dc‐grid power distribution plays a crucial role in the internet of things (IoT) industry. The ac‐grid‐fed electronic systems demand more power converter stages to maintain the PF and provide the regulated output power 8–10 . Further, electrolytic capacitors (ECs) are required to cope with the ac–dc power imbalance 11 .…”

Section: Introductionmentioning

confidence: 99%

Soft‐switched full‐bridge converter for LED lighting applications with reduced switch current

Patakamoori

Udumula

Nizami

et al. 2022

Circuit Theory & Apps

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Lighting systems using light-emitting diode (LED) have drawn significant attention across the world. This is due to their promising features such as high energy efficiency, reduced greenhouse gas emission, and eco-friendly nature. However, these systems require constant current regulators to provide constant illumination. This article proposes a soft-switched full-bridge LED driver circuit for dc-grid applications with dimming control operation. The circuit consists of a softswitched full-bridge converter to power different LED lamps with reduced device count from dc-grid voltage. The semiconductor switches of the full-bridge converter conduct a small current during on time due to interleaved inductor and equal current sharing of lamp-2 and lamp-3. This feature reduces the conduction losses. In addition, the proposed converter yields less component count per lamp, dimming operation through on-off control and zero voltage switching, which results in low switching losses. The detailed steady-state analysis of the proposed converter for dc-grid applications with dimming control operation is presented in this work. The performance of the proposed converter is compared with other similar topologies available in the recent literature. Numerical simulations and real-time experimental validations are conducted to evaluate the steady-state performance of the proposed converter topology for LED applications, driving multiple lamp loads from dc-grid. It has been established that the efficiency of the proposed full-bridge converter is 97.52% at the rated power. K E Y W O R D S light-emitting diodes and dimming control, resonant converters, zero voltage switching

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A Flicker-Free Single-Stage Offline LED Driver With High Power Factor

Cited by 71 publications

References 30 publications

LED Systems Applications and LED Driver Topologies: A Review

LED Systems Applications and LED Driver Topologies: A Review

Electrolytic capacitor‐less reduced power processing single‐phase LED driver with power decoupling using split capacitor

Soft‐switched full‐bridge converter for LED lighting applications with reduced switch current

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