A Simple Two-Channel LED Driver With Automatic Precise Current Sharing

Wu, Xinke; Zhang, Junming; Qian, Zhaoming

doi:10.1109/tie.2011.2109339

Cited by 107 publications

(46 citation statements)

References 12 publications

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“…However, the real challenge here is to do it efficiently. Resonant conversion has been drawing attention because of its high efficiency, especially for applications where a large voltage difference between the input and LED lamp exists [38]- [42]. In [41], the PFC stage is implemented by means of a boost converter cascaded to a current inverter.…”

Section: Independent Stagesmentioning

confidence: 99%

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

Almeida

Camponogara

Costa

et al. 2015

EEE Ind. Electron. Mag.

133

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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

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Section: Independent Stagesmentioning

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

“…The voltage gain in a negative region can be expressed by Equation (16) and the voltage gain according to switching frequency can be found by this equation. Equation (17) shows the voltage gain in a positive region:…”

Section: Proposed Current Balancing Converter For Driving Led Lightsmentioning

confidence: 99%

“…The system consists of an AC power input part and a PFC circuit for improving the power factor, a DC/DC converter for building output voltage, and an LED driver for providing a constant current to the LED load. A fly-back and LLC resonance converter are usually used for the DC/DC converter [14][15][16][17]. Figure 3a shows a buck DC/DC converter mostly used for constant LED current control.…”

Section: Introductionmentioning

confidence: 99%

Design of an LLC Resonant Converter for Driving Multiple LED Lights Using Current Balancing of Capacitor and Transformer

Han

Lim

2015

Energies

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Abstract:In this study, to achieve the constant current drive and brightness control without a separate pulse width modulation (PWM) converter, a single converter is designed and verified by experiment under the condition of a multiple LED light load with different output voltage (Vf) characteristics. In the case of the input of 140 Watt class level, the proposed converter can drive two voltage type 95 Vdc (300 mA) light emitting diode (LED) lights loads and 120 Vdc (300 mA) LED lights loads simultaneously. In addition, to improve commercial compatibility, the proposed converter is operated in a wide range of the input voltage 90~264 Vac; also, the Power Factor Correction (PFC) circuit with the input power factor of more than 0.9 is added. In order to maximize the power conversion efficiency, a LLC resonant converter is applied to the PFC block with the output voltage of 380 Vdc and to a DC-DC conversion block. Finally, reliability of the proposed converter is verified through total harmonic distortion (THD) and electromagnetic interference (EMI) tests.

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“…The passive current balancing method uses a capacitor or an inductor to balance the current in each LED string. A capacitive scheme is proposed in [1,2], those scheme need to be applied in double-end magnetizing topology such as half-bridge converter, compared with single-end magnetizing topology such as boost converter. Another switch is needed and more complication.…”

Section: Introductionmentioning

confidence: 99%

LED backlight driver circuit with dual-mode dimming control and current-balancing design

Lin

Chiu

et al. 2014

2014 International Conference on Intelligent Green Building and Smart Grid (IGBSG)

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A dimmable LED driver circuit with dual-mode dimming control and current-balancing design for backlight application was examined and implemented in this study. Parallel current balancing can be achieved by a passive differential-mode (DM) transformer. The driver has the main power stage constructed by one boost converter. Owing to the high switching frequency, continuous current mode operation and DM transformer magnetizing inductance, the output side only needs an ultra low capacitor. Through the constant current and constant voltage dimming scheme, the LED has smoothed temporary voltage transient and will extend the lifetime of a LED lamp. Furthermore, simplicity, low cost, less capacitor, and gradual voltage rising slope can be achieved. This study included the analyses and discussions for the operational principles of the proposed LED driver. A 10 W-laboratory prototype was built and tested to verify the feasibility of the studied driver.

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A Simple Two-Channel LED Driver With Automatic Precise Current Sharing

Cited by 107 publications

References 12 publications

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

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

Design of an LLC Resonant Converter for Driving Multiple LED Lights Using Current Balancing of Capacitor and Transformer

LED backlight driver circuit with dual-mode dimming control and current-balancing design

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