Low-Cost Drive Circuit for AC-Direct LED Lamps

Chung, Y.; Lee, Kyung-Min; Choe, Hyung-Jin; Sung, Chang-Hyeon; Kang, Bongkoo

doi:10.1109/tpel.2014.2374160

Cited by 12 publications

(5 citation statements)

References 22 publications

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“…In order to increase power factor and efficiency, direct AC LED drivers in [28]- [30] adopted either a micro-controller or a dedicated IC for string controls. In [31], a direct AC LED driver using a simple LED bridge structure is introduced without using either a micro-controller or a dedicated IC, but it requires an inductive component for sensing LED sting current. Other direct AC LED drivers in [32], [33] have developed by adding standard operational amplifiers and switches without the need of a dedicated IC, a micro-controller, or an inductive component.…”

Section: Triac Dimmablementioning

confidence: 99%

A Low Flicker TRIAC Dimmable Direct AC LED Driver for Always-on LED Arrays

Yun

Kim

2020

IEEE Access

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Direct AC LED drivers have advantages over conventional LED drivers in size and cost because of no need for bulky and expensive inductive components. However, none of conventional direct AC LED drivers researched so far support triode AC switch (TRIAC) compatibility at low percent flicker. This paper achieves both TRIAC dimmer compatibility and low percent flicker by correlating a phase-cut ratio to luminance and using always-on multi-arrays, respectively, without the need of a dedicated IC. The proposed LED driver consists of a phase-cut/DC converter, a switch controller, a current regulator, and three LED arrays. The experimental results based on commercial 15W LEDs show that the percent flicker of 18.6% @ 120 Hz is achieved with an efficiency of 84.7% and a power factor of 97.3% @ 120 V.

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Section: Triac Dimmablementioning

confidence: 99%

A Low Flicker TRIAC Dimmable Direct AC LED Driver for Always-on LED Arrays

Yun

Kim

2020

IEEE Access

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“…To get an idea of the total losses of electronic elements (components) of the circuit, you need to calculate their dynamic losses, that is, losses on switching or magnetization reversal in the case of magnetic components. Choosing the best electronic component will come down to choosing a component with minimal total power loss [18][19][20][21][22][23][24][25].…”

Section: Stabilizer Analysismentioning

confidence: 99%

Development and Experimental Test Validation with a New High Efficiency LED Driver

Gani¹

2020

IJATCSE

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This paper presents a novel high efficiency LED driver. The developed version of the LED driver is based on an active AC-DC converter with a flyback topology. A feature of the proposed circuit is the use of a current / voltage stabilizer on the primary side based on microcontroller FL7733A and a passive stabilizer on the secondary side. The methodology for calculating the rms current values is presented. An experimental sample of the LED driver was designed and assembled according to the proposed scheme. Functional tests have been carried out, which show a qualitative advantage in contrast to the standard circuit of the LED driver. Temperature tests were carried out, it can be seen from them that the driver elements do not experience excessive temperature loads and operate in normal temperature limits.

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“…LED drivers demand high performance with increasing functionalities [1]- [4]. LEDs provide the advantages such as high luminous efficiency and long lifetime [1], [5]- [8].…”

Section: Introductionmentioning

confidence: 99%

Variable Frequency Constant Current Control Method for Switched-Capacitor Converter Based Automotive LED Driver

Yang

Zhang

2019

IEEE Access

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A variable-frequency constant-current control (VFCCC) method with the constant ON-time is proposed in this paper for a switched-capacitor (SC) converter-based automotive LED driver. This control method is based on the one-cycle control method. The stable load current regulation could be achieved with the simple analog topology. The variable load current is conveniently set by changing the reference value. In order to reduce the current spikes, the SC topology presented in this paper introduces an inductor in the charge loop. To verify the performance of the proposed control method, a 36-W SC converter is constructed. The VFCCC-controlled SC converter is tested under different operation conditions with the different input voltages and variable constant ON-time. The experimental and simulated results show that with the proposed control method, the external disturbance could be rejected with the fast-dynamical response speed and robust performance. With the SC converter, the high-power density could be realized for the automotive LED driver. The VFCCC control method is suited for the different topologies of SC converters. It could facilitate the SC applications for the automotive LED driver.INDEX TERMS Variable frequency constant current control (VFCCC) method, one-cycle control, switchedcapacitor (SC) converter, automotive LED driver.

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Low-Cost Drive Circuit for AC-Direct LED Lamps

Cited by 12 publications

References 22 publications

A Low Flicker TRIAC Dimmable Direct AC LED Driver for Always-on LED Arrays

A Low Flicker TRIAC Dimmable Direct AC LED Driver for Always-on LED Arrays

Development and Experimental Test Validation with a New High Efficiency LED Driver

Variable Frequency Constant Current Control Method for Switched-Capacitor Converter Based Automotive LED Driver

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