Development of Four-Channel Buck-Type LED Driver with Automatic Current Sharing
Autor: | Yao-De Tsai, Yeu-Torng Yau, Kuo-Ing Hwu |
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Rok vydání: | 2021 |
Předmět: |
Technology
Control and Optimization Computer science differential-mode transformer Energy Engineering and Power Technology law.invention single input law Electronic engineering Electrical and Electronic Engineering Transformer Field-programmable gate array Engineering (miscellaneous) FPGA Diode Renewable Energy Sustainability and the Environment Buck converter LED driver current sharing Capacitor Duty cycle capacitor multiple outputs Energy (miscellaneous) Voltage Communication channel |
Zdroj: | Energies; Volume 14; Issue 23; Pages: 7844 Energies, Vol 14, Iss 7844, p 7844 (2021) |
ISSN: | 1996-1073 |
DOI: | 10.3390/en14237844 |
Popis: | A buck-type light-emitting diode (LED) driver is proposed herein. The proposed LED driver automatically possesses current sharing and high step-down voltage gain. Without complex control, the proposed LED driver, with a single input and multiple outputs, can achieve automatic current sharing of four-channel LED strings, even under the different number of LEDs of each LED string. Furthermore, as compared with the traditional four-phase interleaved buck converter with a single input and a single output having current sharing required, the proposed circuit has the duty cycle up to 0.5, not 0.25, meaning that under the same input voltage the latter has a wider output voltage range than that of the former. Above all, if the proposed circuit with N outputs, then it still has the duty cycle up to 0.5, not one over N as shown traditionally. Moreover, as compared with the current sharing based on the differential-mode transformer, the proposed circuit has no magnetic resetting loop required. In this paper, the operating principles and design considerations of the proposed converter are discussed. Finally, the theoretical analyses and performances of the proposed LED driver are verified by simulation and experiment. |
Databáze: | OpenAIRE |
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