A New Electrolytic Capacitor-less LED Driver with Coupled-Inductor

Cao, Lingling; Zhu, Yixin; Wu, Hao

doi:10.1109/apec39645.2020.9124527

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…For these reasons, more and more converter topologies without electrolytic capacitors have appeared in the literature, such as [361] for flicker-free ac-dc LED driver applications and [362] for ripple cancelation in high-power LED drivers. In [363], an electrolytic capacitor-less LED driver topology with PFC capability is presented and shown in Figure 37c. In this topology, the front-end inductor and the driver inductor are purposefully coupled, causing the transfer of some power directly to the LED load without being processed twice.…”

Section: Future Researchmentioning

confidence: 99%

A Review on Power Electronics Technologies for Power Quality Improvement

et al. 2021

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Nowadays, new challenges arise relating to the compensation of power quality problems, where the introduction of innovative solutions based on power electronics is of paramount importance. The evolution from conventional electrical power grids to smart grids requires the use of a large number of power electronics converters, indispensable for the integration of key technologies, such as renewable energies, electric mobility and energy storage systems, which adds importance to power quality issues. Addressing these topics, this paper presents an extensive review on power electronics technologies applied to power quality improvement, highlighting, and explaining the main phenomena associated with the occurrence of power quality problems in smart grids, their cause and effects for different activity sectors, and the main power electronics topologies for each technological solution. More specifically, the paper presents a review and classification of the main power quality problems and the respective context with the standards, a review of power quality problems related to the power production from renewables, the contextualization with solid-state transformers, electric mobility and electrical railway systems, a review of power electronics solutions to compensate the main power quality problems, as well as power electronics solutions to guarantee high levels of power quality. Relevant experimental results and exemplificative developed power electronics prototypes are also presented throughout the paper.

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Section: Future Researchmentioning

confidence: 99%

A Review on Power Electronics Technologies for Power Quality Improvement

et al. 2021

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“…LED devices connected to AC lines need to meet the harmonic requirements of IEC6100-3-2 Class C for the device, so a Power Factor Correction (PFC) converter needs to be used behind the rectifier bridge to make the power factor close to 1 [2]- [3] . This causes the input power and output power of LED lighting equipment to contain double-line-frequency ripple.…”

Section: Introductionmentioning

confidence: 99%

High efficiency single-stage electrolytic-capacitor-less flicker-free boost LED driver

Lu,

Zhang,

Han

et al. 2024

Ninth International Symposium on Sensors, Mechatronics, and Automation System (ISSMAS 2023)

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To solve the problems of short lifespan and double-line-frequency current ripple caused by LED driver, and reduce the number of energy processing times, a high-efficiency single-stage electrolytic-capacitor-less flicker-free Boost LED driver based on the traditional Boost circuit is proposed. The driver introduces a ripple cancellation circuit, which outputs an AC ripple cancellation voltage to offset the total voltage ripple and achieve a flicker-free LED driver. Ceramic capacitors are used instead of electrolytic capacitors to extend the life of the LED driver. 96% of the power of the LED driver is converted once, the ripple coefficient of the output voltage is less than 2%, and output capacitor Co1 and output capacitor Co2 are 100μF and 47μF ceramic capacitors respectively. Finally, an 80W experimental prototype was built to verify the feasibility of the scheme.

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“…In advanced countries, lighting electricity accounts for a high proportion of overall electricity consumption, so research on high-efficiency LED drivers has become an important topic in academia and industry. In general, circuit efficiency and lifetime are two important considerations when designing LED drivers [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Flicker-Free LED Driver with Soft-Switching Feature

et al. 2022

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A novel interleaved DC-DC buck converter is proposed to drive high-brightness light-emitting diodes (LEDs). The circuit configuration mainly consists of two buck converters, which are connected in parallel and use interleaved operation. Through interleaved operation, the power capability of the converter is doubled. Traditionally, two individual inductors are used in the two buck converters. The difference between conventional parallel-operated buck converters using two energy storage inductors and the proposed circuit is that the proposed circuit uses two small inductors and a coupled inductor that replace the two inductors of the buck converters. In this way, both buck converters can be designed to operate in discontinuous-current mode (DCM), even if the magnetizing inductance of the coupled inductor is large. Therefore, the freewheeling diodes can achieve zero-current switching off (ZCS). Applying the principle of conservation of magnetic flux, the magnetizing current is converted between the two windings of the coupled inductor. Because nearly constant magnetizing current continuously flows into the output, the output voltage ripple can be effectively reduced without the use of large-value electrolytic capacitors. In addition, each winding current can drop from positive to negative, and this reverse current can discharge the parasitic capacitor of the active switch to zero volts. In this way, the active switches can operate at zero-voltage switching on (ZVS), leading to low switching losses. A 180 W prototype LED driver was built and tested. Our experimental results show satisfactory performance.

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A New Electrolytic Capacitor-less LED Driver with Coupled-Inductor

Cited by 8 publications

References 20 publications

A Review on Power Electronics Technologies for Power Quality Improvement

A Review on Power Electronics Technologies for Power Quality Improvement

High efficiency single-stage electrolytic-capacitor-less flicker-free boost LED driver

High-Efficiency Flicker-Free LED Driver with Soft-Switching Feature

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