scholarly journals Modeling And Control Of A Low Frequency Offline Led Driver Based On Boost Pre-regulator

2017 ◽  
Vol 22 (4) ◽  
pp. 350-361
Author(s):  
Fernando Nogueira ◽  
Lucas Resende ◽  
Ruan Ferraz ◽  
Fabricio Coelho ◽  
Edmar Silva ◽  
...  
Keyword(s):  
Low Frequency ◽  
Led Driver ◽  
Modeling And Control ◽  
And Control

Modeling and Control of a Low Frequency Off-line LED Driver Based on Boost Pre-Regulator

2018 ◽  
Author(s):  
Lucas H.G. Resende ◽  
Ruan M. Ferraz ◽  
Guilherme M. Soares ◽  
Pedro S. Almeida ◽  
Henrique A.C. Braga
Keyword(s):  
Low Frequency ◽  
Led Driver ◽  
Modeling And Control ◽  
And Control

scholarly journals Analysis and Control of Electrolytic Capacitor-Less LED Driver Based on Harmonic Injection Technique

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3030 ◽  
Author(s):  
Mahmoud Nassary ◽  
Mohamed Orabi ◽  
Manuel Arias ◽  
Emad Ahmed ◽  
El-Sayed Hasaneen
Keyword(s):  
Power Factor ◽  
Low Frequency ◽  
Buck Converter ◽  
Electrolytic Capacitor ◽  
Injection Technique ◽  
Led Driver ◽  
Harmonic Injection ◽  
Output Capacitor ◽  
And Control ◽  
Led Drivers

AC-DC LED drivers may have a lifespan shorter than the lifespan of LED chips if electrolytic capacitors are used in their construction. Using film capacitors solves this problem but, as their capacitance is considerably lower, the low-frequency ripple will increase. Solving this problem by limiting the output ripple to safe values is possible by distorting the input current using harmonic injection technique, as long as these harmonics still complies with Power Factor Regulations (Energy Star). This harmonic injection alleviates the requirements imposed to the output capacitor in order to limit the low-frequency ripple in the output. This idea is based on the fact that LEDs can be driven by pulsating current with a limited Peak-To-Average Ratio (PTAR) without affecting their performance. By considering the accurate model of LEDs, instead of the typical equivalent resistance, this paper presents an improved and more reliable calculation of the intended harmonic injection. Wherein, its orders and values can be determined for each input/output voltage to obtain the specified PTAR and Power Factor (PF). Also, this harmonic injection can be simply implemented using a single feedback loop, its control circuit has features of wide bandwidth, simple, single-loop and lower cost. A 21W AC-DC buck converter is built to validate the proposed circuit and the derived mathematical model and it complies with IEC61000 3-2 class D standard.

Modeling and Control Design for a Very Low-Frequency High-Voltage Test System

2010 ◽  
Vol 25 (4) ◽  
pp. 1068-1077 ◽  
Author(s):  
Zhiyu Cao ◽  
Manli Hu ◽  
Norbert Frohleke ◽  
Joachim Bocker
Keyword(s):  
High Voltage ◽  
Low Frequency ◽  
Control Design ◽  
Test System ◽  
Modeling And Control ◽  
Very Low Frequency ◽  
And Control

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

Electronics ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 664 ◽  
Author(s):  
Jorge Garcia ◽  
Sarah Saeed ◽  
Pablo Quintana ◽  
Jesus Cardesin ◽  
Ramy Georgious ◽  
...  
Keyword(s):  
Low Frequency ◽  
Current Control ◽  
Buck Converter ◽  
Constant Current ◽  
Led Driver ◽  
Original Proposal ◽  
Voltage Ripple ◽  
Power And Control ◽  
Optimization Methodology ◽  
And Control

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.

scholarly journals A Generic Control-Oriented Model Order Reduction Approach for High Step-Up DC/DC Converters Based on Voltage Multiplier

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1971
Author(s):  
Binxin Zhu ◽  
Qingdian Zeng ◽  
Mahinda Vilathgamuwa ◽  
Yang Li ◽  
Yao Chen
Keyword(s):  
Control System ◽  
System Design ◽  
Controller Design ◽  
Low Frequency ◽  
Order Reduction ◽  
Control System Design ◽  
Model Order ◽  
Modeling And Control ◽  
Simulation Results ◽  
And Control

The modeling and control system design of high step-up DC/DC converters based on voltage multipliers (VMs) are difficult, due to the various circuit topologies and the presence of large number of capacitors in VMs. This paper proposes a generic approach to reduce the model order of such converters by replacing the VM capacitors with voltage sources controlled by the output voltage of the converter. Theoretical analysis and simulation results show that the derived models can accurately represent the low frequency response of the converter which is valuable for obtaining a small-signal AC model for control system design. The detailed modeling and controller design process are demonstrated for the converter, and the obtained simulation results are verified experimentally on a 400 W prototype.

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