LED driver with bidirectional series converter for low frequency ripple cancelation

Garcia, J.; Camponogara, Douglas; Costa, Marco A. Dalla; Gacio, D.; Alonso, J.M.; Campos, Alexandre

doi:10.1109/iecon.2012.6389480

Cited by 9 publications

(13 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, in [66]- [68], the second stage is used just to process the low-frequency ripple from the ac line, storing energy for a half-cycle and returning it to the load on the other half. This technique has also shown good results in capacitance reduction.…”

Section: Reduced Power Processingmentioning

confidence: 99%

“…Besides that, it is possible to use an inductor instead of a capacitor as the main energy-storage element [68], which can work at higher temperature levels than capacitors. The second converter can be connected in series [68] or in parallel [66], [67] with the load. As the second stage operates by first sinking energy and returning it afterward to the load, it must be implemented by a bidirectional converter.…”

Section: Reduced Power Processingmentioning

confidence: 99%

See 1 more Smart Citation

Matching LED and Driver Life Spans: A Review of Different Techniques

Almeida

Camponogara

Costa

et al. 2015

EEE Ind. Electron. Mag.

133

View full text Add to dashboard Cite

review of various proposed schemes to increase the reliability and life span of solid-state lighting (SSL) systems is presented in this article. Since the mainstream devices employed for such lighting systems are inorganic, high-power light-emitting diodes (LEDs), which are devices characterized by their very long life, most of the questions in reliability and endurability arise from the electronic offline circuit driving the LEDs. Issues regarding the limited reliability of specific components, such as electrolytic capacitors, are introduced. Several power-conversion configurations aimed to capacitance reduction and capacitor technology exchange are put forward as alternative solutions for implementing long-life drivers, with remarks on both their benefits and drawbacks. An extensive literature review on the topic

show abstract

Section: Reduced Power Processingmentioning

confidence: 99%

Section: Reduced Power Processingmentioning

confidence: 99%

Matching LED and Driver Life Spans: A Review of Different Techniques

Almeida

Camponogara

Costa

et al. 2015

EEE Ind. Electron. Mag.

133

View full text Add to dashboard Cite

show abstract

“…This represents an important advantage in comparison with related topologies, which use bidirectional converters [29], [30], [37], because it reduces the complexity and the number of active switches. However, a safe margin between the minimum PC converter output voltage and the zero voltage must be provided in the design.…”

Section: Optimized Cascadementioning

confidence: 99%

Capacitance Reduction With An Optimized Converter Connection Applied to LED Drivers

Camponogara

Vargas

Costa

et al. 2015

IEEE Trans. Ind. Electron.

View full text Add to dashboard Cite

This paper presents a new control method and a detailed project methodology for the optimized connection method of two converters, aiming to reduce the redundant power processing, in order to supply high power LEDs with reduced capacitance and high efficiency, directly from the AC line. This connection method allows dealing with two major issues related to the LED driver: capacitance reduction and efficiency increasing. The first converter provides Power Factor Correction (PFC), while the second converter controls the current through the LED. The basic idea consists in making the second converter to process only the low frequency ripple of the first converter, thus smoothing the LED current. In this way, the low frequency ripple is managed by the second stage so that the capacitance of the first stage can be significantly reduced. The proposed control method can achieve better results for the low frequency compensation. Besides that, a high power factor and a low harmonic content are obtained, fulfilling the IEC 61000-3-2 class C requirements. A laboratory prototype with a rated power of 75 W and an input voltage of 220 Vrms/60 Hz was built in order to show the feasibility of the idea. The measured overall efficiency of the converter was 91% and electrolytic capacitors were avoided.

show abstract

“…In order to achieve this goal, electrolytic capacitors must be discarded. Therefore, researchers have come up with novel control strategies [16][17][18][19] as well as optimized topologies [6,13,[20][21][22][23][24][25][26][27][28][29][30][31][32][33] that imply smaller capacitances in the DC link, to overcome this issue.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a Series Converter for Low-Frequency Ripple Cancellation of an LED Driver

et al. 2019

View full text Add to dashboard Cite

In this paper, the optimization of the power and control stages of a previously proposed topology for an off-line LED electronic driver is presented. The full system avoids the use of electrolytic capacitors at the D C link, therefore increasing the lifespan and reliability of the driver. As a consequence of having a relatively small capacitance, the D C link operates with a large Low-Frequency ( L F ) voltage ripple. This work presents a design optimization for the power and control stages of a current-fed bidirectional buck converter, operating as the LED current control stage. As this block processes only the A C power arising from the L F voltage ripple, it can increase the system efficiency against the typical two-stage solution. In the original proposal, the main drawback was the high inductor losses due to the resulting large inductor currents and large inductance value. The proposed optimization ensures an enhanced design of the inductor while keeping a constant current through the LEDs. A new optimization methodology is proposed and the theoretical results have been validated in a built prototype for a 40 W LED lamp.

show abstract

LED driver with bidirectional series converter for low frequency ripple cancelation

Cited by 9 publications

References 19 publications

Matching LED and Driver Life Spans: A Review of Different Techniques

Matching LED and Driver Life Spans: A Review of Different Techniques

Capacitance Reduction With An Optimized Converter Connection Applied to LED Drivers

Optimization of a Series Converter for Low-Frequency Ripple Cancellation of an LED Driver

Contact Info

Product

Resources

About