A New Technique to Equalize Branch Currents in Multiarray LED Lamps Based on Variable Inductors

Pinto, Rafael A.; Alonso, J.M.; Perdigão, M. S.; Silva, M. F. da; Prado, R.N. do

doi:10.1109/tia.2015.2483596

Cited by 42 publications

(30 citation statements)

References 27 publications

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“…In the coupled capacitor based approach as shown in Figure 2(d), the current balance is achieved because of the large capacitive reactance compared to the LED load capacitance. 35 This method is more accurate but a bottleneck exists in the integration of variable inductors in to the LED technology. Another method is based on coupled inductors as shown in Figure 2(e).…”

Section: Classification Of Led Driversmentioning

confidence: 99%

“…These switched-mode converters are classified as single-stage, two-stage and integrated stages as shown in Figure 3. 34 35 solution is to implement integrated converters which are based on the integration of PFC stage in to the DC-DC converter. 31 It uses a non-electrolytic capacitor of long life and helps to minimize the flickering of lamps.…”

Section: Classification Of Led Driversmentioning

confidence: 99%

“…The variable inductor based current balance is shown in Figure 2(f). 35 This method is more accurate but a bottleneck exists in the integration of variable inductors in to the LED technology. Furthermore, this current regulation problem can be resolved by a linear regulator which acts like a controlled current source.…”

Section: Classification Of Led Driversmentioning

confidence: 99%

“…33 (e) Coupled inductor-based. 34 35 solution is to implement integrated converters which are based on the integration of PFC stage in to the DC-DC converter. This results in reduced cost, size, high efficiency and fast dynamics.…”

Section: Classification Of Led Driversmentioning

confidence: 99%

See 3 more Smart Citations

An overview of energy efficient solid state LED driver topologies

Yadlapalli

Narasipuram²,

Anuradha³

2019

Int J Energy Res

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LED lamps are projected as prospective successors of incandescent lamps with high efficiency and a long lifetime. Therefore, there is a need to develop energy efficient LED driver topologies for achieving constant current regulation, despite the effects of temperature on the LED V-I characteristics. This paper presents the salient features of various LED driver topologies with a focus on power density, multi-string operation, renewable energy utilization, soft switching, optical wireless communication, reliability and size. The performance of the above topologies is analysed in terms of the number of components, converter switching frequency, galvanic isolation, power rating and efficiency. This paper takes a look at efficiency improvement methods while dwelling on aspects of lifetime and reliability prediction of LED drivers. The paper will anticipate some of the future trends associated with the adaptation of wide bandgap power semiconductor materials, smart LED lighting for the internet of things (IoT) and programmable LED lamp drivers. This detailed technology review is extremely useful for researchers, designers and engineers in choosing the right topology.

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Section: Classification Of Led Driversmentioning

confidence: 99%

Section: Classification Of Led Driversmentioning

confidence: 99%

Section: Classification Of Led Driversmentioning

confidence: 99%

Section: Classification Of Led Driversmentioning

confidence: 99%

See 2 more Smart Citations

An overview of energy efficient solid state LED driver topologies

Yadlapalli

Narasipuram²,

Anuradha³

2019

Int J Energy Res

View full text Add to dashboard Cite

show abstract

“…The same idea is applied in LLC resonant converter for battery charging applications. 21 In Pinto et al, 22 VI is successfully used for equalization of branch currents in multi-array light-emitting diode (LED) lamps, as electronic ballasts for fluorescent lamps. 23 In this paper, a design and control of the IPT system for maintaining the constant output voltage over the wide LCT coupling variation range is presented.…”

Section: Introductionmentioning

confidence: 99%

Design of compensation network with variable inductance for wide variation of coupling coefficient in inductive power transfer

Ðurić

Pajnić

2019

Circuit Theory & Apps

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Summary In this paper, a design of the compensation network with a variable inductor is proposed, considering a wide variation of the coupling coefficient in the inductive power transfer (IPT). The characteristics of the proposed compensation network are analyzed with respect to the variable antenna coupling conditions. The realization of the zero voltage switching (ZVS) and the reactive power demand are discussed through the theoretical deduction and numerical simulation. Influence of the variable inductor on the compensation network characteristics is examined in detail, and the control algorithm for achieving the coupling independent constant output voltage is proposed. Detailed steps to design a prototype fulfilling all performance requirements are given. Verification of the proposed method was carried out on the experimental model. Recorded output voltage variation is within 5% over the wide coupling range, implying a quite well characteristic of the coupling independent voltage output. Experimental results match well with the calculations, validating the rightness of the proposed variable inductor tuning method.

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Three‐phase LLC resonant converter with variable magnetizing inductance to extend gain range

Zhao,

Shi,

Shi

et al. 2024

Circuit Theory & Apps

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SummaryLLC resonant converter has been widely employed in electric vehicle (EV) charging applications. Compared with single‐phase LLC converters, three‐phase LLC converters provide a smaller current ripple, higher power capacity, and higher power density at higher power levels. However, the conventional three‐phase LLC converter, which adopts pulse frequency modulation (PFM), has the issue of limited gain range. In this paper, a three‐phase LLC resonant converter with variable magnetizing inductance is proposed. A two‐stage control strategy of PFM and fixed‐frequency magnetizing inductance modulation (MIM) is proposed. The wide gain range needed for EV charging is realized by modulating magnetizing inductance and frequency. Finally, a 2.7 kW prototype with 400 V input and 280–420 V output range verifies the theoretical analysis and parameter design. The experimental results show that the converter can achieve soft switching and a wide gain range and the peak efficiency is 97.7%.

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A New Technique to Equalize Branch Currents in Multiarray LED Lamps Based on Variable Inductors

Cited by 42 publications

References 27 publications

An overview of energy efficient solid state LED driver topologies

An overview of energy efficient solid state LED driver topologies

Design of compensation network with variable inductance for wide variation of coupling coefficient in inductive power transfer

Three‐phase LLC resonant converter with variable magnetizing inductance to extend gain range

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