Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"LED driver"”.
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On-chip current sensing for monolithic buck LED driver
… sensing and regulating current for a buck LED driver, as compared to a common external solution. With the rise of LED use in common lighting applications, it becomes increasingly necessary to develop solutions that are simple to use and accurate. In this paper, much of the focus is on …
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Two-Stage Multi-Channel LED Driver with CLL Resonant Converter
LED is widely used in many applications, such as indoor lighting, backlighting and street lighting, etc. For these application, multiple LED strings structure is adopted for reasons of cost-effectiveness, reliability and safety concerns. Several methods and topologies have been proposed to drive …
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Multi-Channel Constant Current (MC3) LED Driver for Indoor LED Luminaries
… lighting source, light-emitting diodes (LEDs) have become more and more attractive and have great opportunity to replace traditional lighting sources - incandescent, fluorescent and HID because of the advantages such as high luminous efficacy, long lifetime, quick on/off time, wide color …
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Design and implementation of A truecolor wide dimming single-pin LED driver
This thesis develops a single-pin LED driver used in wide screen displays. With the increasing size of the displays, a more compact multi-channel driver solution is needed for the increasing number of back light LEDs. This thesis focuses on the pin count and the accuracy. Simulation results and …
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A design for an RGB LED driver with independent PWM control and fast settling time
A small sized and efficient method to power RGB LEDs for use as backlights in flat panel displays is explored in this thesis. The proposed method is to drive a parallel switched connection of LEDs with a single Average Mode Controlled buck regulator.Specifications for the switching regulator and …
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A Merged two-stage power conversion architecture with switched capacitor circuit for an LED driver module
In a power converter specified to convert from wide-range and high-level DC voltage or AC line voltage to low-level DC voltage, satisfying high efficiency, high power density, and high power factor is challenging because of the higher device stress and difficulty of maintaining ZVS/ZCS conditions. …
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A High efficiency high power led driver with fault tolerance and multiple led load driving using a coupled Cuk converter
… 20-25% of the energy produced worldwide. LED based lighting is rapidly becoming the preferred choice over incandescent and fluorescent based lighting. LEDs have advantages such as high efficacy, long operating lifetime and excellent lumen maintenance. Therefore, to gain benefits from LEDs …
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Designing and Implementing a Micro-controller based Primary-side Sensing Flyback Converter for LEDs Driver
<p>The fast development of LED and its applications has enabled a new generation of lighting device with higher efficiency and long lifespan. By employing a primary-side sensing flyback converter and the PIC18F micro-controller series, an LED driver could achieve two important features: (1) the …
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A stimulus/recording system for optogenetics: circuit, firmware, and software design and implementation
… The system comprises a photodiode amplifier, LED driver, embedded control system, and desktop control software. The low-noise, precision photodiode amplifier is designed to read the weak photo-current signal associated with neural activities and convert it to proper voltage for signal analysis. …
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High Efficiency SEPIC Converter For High Brightness Light Emitting Diodes (LEDs) System
… of and driving methods for light emitting diode (LED) lamp system. A comprehensive overview on the lighting development is proposed. The characteristic of the light emitting diode (LED) lamp is described and the requirements of the ballast for the light emitting diode (LED) lamp are presented. …
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Investigation Of A Floating Load Buck Dc-Dc Switching Converter
… a high-voltage off-line light-emitting diodes (LEDs) driver using a Texas Instruments' TPS92001 controller. Finally, the characteristics of this floating load buck converter LED driver were experimentally examined.</p>
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A merged two-stage converter for LED lighting applications
Light Emitting Diodes (LEDs) are a very promising technology for developing more efficient lighting. For high-efficiency applications, a switching current regulator is necessary to control the power drawn by an LED string. This thesis investigates a merged two-stage LED driver for lighting …
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(MEMS) toroidal magnetics for integrated power electronics
… off-line power supplies, light-emitting diode (LED) drivers, converters and inverters for photovoltaic panels, and battery interface converters; a LED driver application serves as a motivation example throughout the thesis. Advances in the miniaturization and integration of energy-conversion …
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Energy efficient control for power management circuits operating from nano-watts to watts
… power, basically consists of power trains, gate drivers and control circuits. Although the control circuits are primarily required for regulation, these circuits can play a crucial role in achieving high efficiency and/or minimizing overall system form-factor. In this thesis, power converter …
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Adaptive Automotive Lighting Systems
<p>Over the past few years, the use of LEDs within the automotive and avionic industries has increased due to their high efficiency, durability and wide range of light brightness. As the use of LEDs within these industries grows, a need for reliable, high performance drivers becomes more relevant. …
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High performance electronic systems for high bay light emitting diodes fed from alternating current power grids
Light-Emitting Diodes (LEDs) are increasingly becoming our main source of artificial light in our homes, offices or streets due to their reliability, long life, luminous efficacy and low maintenance requirements. However, LEDs are diodes, which means that the current is able to go through them in …
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Development of A Versatile Multichannel CWNIRS Instrument for Optical Brain-Computer Interface Applications
… to multichannel was based on a software-controlled interface. This interface allowed flexibility in the control of individual optodes including their synchronisation and modulation (AM, TDM, CDMA). Furthermore, an LED driver was developed for custom-made triple-wavelength LEDs. The system was …
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Modeling and Control of Single Switch Bridgeless SEPIC PFC Converter
… an important issue in light-emitting diode (LED) lighting applications. A boost converter is one of the most well-known PFC topologies, due to its simple circuitry, simple control scheme and small number of passive components. Even though a boost converter is recognized as a typical PFC …
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Single-stage boost integrated asymmetrical half-bridge AC-DC power converter with dual modulation for indoor led lighting
Light emitting diodes (LEDs) for indoor lighting is a promising technology which can lead to major energy saving and cost reductions. The major concerns of improving power factor and regulating the output current ripple with regards to LED drivers has been addressed in this thesis by using dual …
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Unified Three-terminal Switch Model for Current Mode Controls
… power factor correction, battery charger and LED driver. Since the inductor current ramp, one of state variables influenced by the input voltage and the output voltage, is used in the modulator in current-mode control without any low pass filter, high order harmonics play important role in the …
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