Area-Saving and High-Efficiency RGB LED Driver with Adaptive Driving Voltage and Energy-Saving Technique

Hsu, Yi-Chieh; Lin, Jing‐Yuan; Chen, Charlie Chung‐Ping

doi:10.3390/en11061422

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…Figure 1 depicts a typical application of a current sink driver as part of an LED driver. Here the current sink driver ensures that the desired current level passes through the LED string [15,16]. The DC-DC converter produces an output voltage that is suitable for the load from a given input voltage.…”

Section: Introductionmentioning

confidence: 99%

A Design Methodology of High-Efficiency Dimmable Current Sink for Current-Regulated Drivers

2022

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This paper proposes a high-efficiency and dimmable current sink topology along with a design methodology for low node processes. The design methodology is demonstrated using a boost-based WLED driver application. In this work, the focus is on current regulation rather than voltage regulation. Therefore, the proposed topology exploits a smaller and faster NMOS pass device, replacing the conventional PMOS-based LDO arrangement. An amplifier-boosted pass-transistor current sink topology combined with a 5-bit programmable degenerated source resistor is being utilized for high-efficiency and brightness control. The realized WLED driver validates the proposed topology and the design methodology utilizing 40 nm CMOS TSMC technology. The design takes advantage of the programmability of the resistor to enhance the system’s power efficiency. This programmable resistor enables dimmability via current segmentation with a 1 mA step for a total of 25 mA. For a 500 mV voltage ripple at the DC-DC converter output driving 6 WLEDs with a 3.2 V forward voltage drop each, a worst-case current ripple of 200 µA and simulated efficiency of 97.6% is achieved for optimum pass-transistor size.

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Section: Introductionmentioning

confidence: 99%

A Design Methodology of High-Efficiency Dimmable Current Sink for Current-Regulated Drivers

2022

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“…In order to deal with these issues, many governments have already forbidden the trade of incandescent lamps and, on the other hand, encouraged the employment of light-emitting diodes (LEDs). They have been widespread both in private and public lighting systems thanks to their high luminous efficacy, long lifespan, high reliability and environmental friendliness [4]. Generally speaking, a LED lamp can be thought of as a combination of LED semiconductor materials and a driver circuit, thus the choice of the LED driver circuit plays a fundamental role from a power quality point of view.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Input Current Distortion and Guidelines for Designing High Power Factor Quasi-Resonant Flyback LED Drivers

et al. 2020

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Nowadays, LED lamps have become a widespread solution in different lighting systems due to their high brightness, efficiency, long lifespan, high reliability and environmental friendliness. The choice of a proper LED driver circuit plays an important role, especially in terms of power quality. In fact, the driver controls its own input current in addition to the LED output current, thus it must guarantee a high power factor. Among the various LED drivers available on the market, the quasi-resonant (QR) flyback topology shows interesting benefits. This paper aims at investigating and analyzing the different issues related to the input current distortion in a QR flyback LED driver. Several effects, such as the distortion caused by the ringing current, crossover distortion due to transformer leakage inductance and crossover distortion due to the input storage capacitor have been experimentally reported. These effects, not previously studied for a high power factor (Hi-PF) QR flyback, have been analyzed in depth. Finally, some practical design guidelines for a Hi-PF QR flyback driver for LED applications are provided.

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Voltage regulation and power-saving method of asynchronous motor based on fuzzy control theory

Guo

2022

Open Physics

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The load rate of asynchronous motors is low, the operation efficiency is low, and the waste of electric energy is very serious. Therefore, a voltage regulation and electricity saving method for asynchronous motors based on fuzzy control theory is proposed. According to the principle of voltage regulation and power saving of asynchronous motor, the stator current and its variation of are selected as input variables, the deviation of current variation is selected as output variable, and a two-dimensional fuzzy control algorithm model is constructed. Fuzzy control theory is used for voltage regulation and power saving of asynchronous motors. The simulation results show that the proposed method is based on fuzzy control theory for voltage regulation and electricity saving of asynchronous motors; after the voltage regulation and electricity saving control, the phase current of the motor is lower, and the active power and reactive power of the motor are reduced. The power factor of the motor is higher, and the power-saving effect is remarkable.

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Area-Saving and High-Efficiency RGB LED Driver with Adaptive Driving Voltage and Energy-Saving Technique

Cited by 4 publications

References 27 publications

A Design Methodology of High-Efficiency Dimmable Current Sink for Current-Regulated Drivers

A Design Methodology of High-Efficiency Dimmable Current Sink for Current-Regulated Drivers

Analysis of the Input Current Distortion and Guidelines for Designing High Power Factor Quasi-Resonant Flyback LED Drivers

Voltage regulation and power-saving method of asynchronous motor based on fuzzy control theory

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