According to a study by Strategies Unlimited, the market for high-brightness LEDs is expected to reach $8.2 billion in 2010, and is expected to grow to $20.2 billion by 2015, with a compound annual growth rate (CAGR) of 30.6%. The LEDs currently used to backlight the display are the main drivers of this growth, including high-definition televisions, automotive displays, and a large number of handheld devices. To maintain high growth rates, LEDs need to provide higher reliability, lower power...
For the novice, LED driver design is not an easy task. In response to this problem, Xiao Bian specially summarizes some of the problems that design people need to pay attention to at work and personal design experience to share. Do not use bipolar power devices Since bipolar power devices are cheaper, generally about 2 cents, some designers use bipolar power devices to reduce the cost of LED driving, which will seriously affect the reliability of the circuit, because with the LED driver board...
Introduction: This LED driver design solution has small volume, low cost, high PF and high TRIAC brightness adjustment performance. For the sake of understanding, the experimental results obtained based on the 7W application are provided as a reference. As long as the design is easily modified, it can be applied to other applications. This solution uses a single-stage power factor correction (PFC) inverting converter with primary side constant power control. It achieves primary side constant...
Abstract: Controlling the junction temperature of LEDs to a certain range is the key to ensuring the lifetime and luminous efficiency of LED lamps. In this paper, the measurement method of LED junction temperature is discussed. It is proposed to measure the junction temperature of LED light source in real time through single-chip microcomputer. When the junction temperature exceeds the set value, the PWM signal is generated to adjust the output power of the power supply. The power supply...
In today's rapidly evolving automotive lighting market, the role of LED drivers is particularly important: to provide car manufacturers with more energy-efficient options to meet consumer fuel economy requirements, improve visibility safety to reduce or avoid traffic accidents, and create personalities. The atmosphere of the vehicle reaches the consumer's unique expectation of the car... This article refers to the address: http:// In the next 8 years, the overall annual growth rate of...
White LEDs are widely used in small liquid crystal display (LCD) panels, keyboard backlights, and indicator applications. High-brightness LEDs are used in flash sources for cell phones and digital cameras. These applications require an optimized driver solution that extends battery life and reduces printed circuit board (PCB) area and height. In these applications, common LED driver solutions involve different topologies of linear, inductive or charge pump types, each with its own...
In recent years, mobile phones have been constantly updated, and their functions are more and more. In addition to the main call functions, they can also send and receive text messages, take photos, listen to music, and even access the Internet and watch movies. In addition, the phone can also be used as a flashlight, although this feature is nothing new, but very practical. What can be achieved is Linear Technology's recently introduced high-current white LED driver, the LTC3454, which acts as...
According to DIGITIMES Research, TFT LCDs, which currently occupy the mainstream of display technologies, must be matched with backlight modules because they cannot emit light. In light of the fact that energy-saving and carbon-reduction has become a global terminal product design, LED backlight modules have become thinner and lighter than traditional cold cathode tube (CCFL) modules, have a long life, do not contain heavy metals, and save power. They have become a backlight for NB since 2009....
Global LED driver IC leading brands accumulate revenue in November fell by about 10%, although the traditional off-season in the fourth quarter, but driven by the increase in LED demand in mainland China, the fourth quarter revenue is expected to reach 520 million yuan, only the first The three quarters fell 5-10%, and the quarter-on-quarter reduction was better than the company's expectations. Accumulation said that in addition to continuing to increase the market share of the display next...
To emulate the natural soft start of an incandescent bulb, this circuit makes use of the thermal-foldback protection built into an LED-driver IC (MAX16832). It may avoids the annoying and almost instantaneous startup otherwise exhibit by LEDs. An of the less obvious differences between incandescent light bulbs and LED-based lights is the speed at which they start up. An incandescent bulb requires some time to reach full brightness after you switch it on, and that delay gives the eye a...
At the same time as the LED shines, LED drive power supply | regulator is the protection of the development of the LED industry chain, LED power quality directly constrain the reliability of led products, therefore, in the LED industry chain gradually improved today, LED The maturity of the drive power is also crucial. As far as LED power companies are concerned, the growth rate of the high-power power supply market around 100W in 2009 will be greatly improved. LED lights sourced from about...
LED drive power supply When a commercial power supply (100V AC) is used to illuminate an LED, an AC/DC power supply is required to generate a resistor-limited LED power supply, or a capacitor loss circuit. However, if the AC/DC power supply is used in an excessively large shape, the capacitor loss is disadvantageous in that the current flowing through the LED is small. In this regard, IDEC's LED driver not only directly drives the LED from the AC current, but also allows the high-luminance LED...
LEDs have low energy consumption, long life, low heat generation, environmental protection, etc., and have been widely used in many fields, such as: a. Lighting field street lights, ramp lights, LED grille lights, LED indoor lights, LED ceiling lights, etc. b. Landscape lighting buildings, roads and bridges, square building facilities, lawn lights, curtain wall lights, etc. c. used as a backlight mobile phone, computer, etc. d. Information plane display display board, dynamic billboards,...
A Resistor- Voltage Buckle 1. Principle of Resistor-Voltage Buckling and Application Capacitor Buck is actually using capacitive reactance current limiting, and the capacitor actually acts as a limiting current and dynamically distributing the voltage across the capacitor and the load. 2. When using capacitor step-down, pay attention to the following points. According to the current of the load and the working frequency of the AC, select the appropriate capacitor instead of the voltage and...
Light-emitting diode (LED) driver IC suppliers are actively rushing into dimmable LED lighting market solutions. Unless the dimming LED lighting system, the cost challenge of the dimmable LED lighting system is also increasingly intensified, so wafer vendors are struggling to develop software and hardware functions that support temperature compensation, drivers, and programmable registers. A highly integrated dimming solution to assist LED lighting system manufacturers to reduce the overall...
Abstract: This paper proposes a design scheme of capacitor buck low-power LED driving circuit based on constant current diode. It is powered by AC mains and outputs low-voltage constant current. It only needs to adjust some component parameters in the circuit to drive different power LED lights with constant current. group. This design introduces a constant current diode based on the traditional capacitor step-down drive circuit to ensure the low-voltage constant current output of the drive...
According to the power utilization rules of the power grid and the characteristic requirements of LED drive power supply, the following points should be taken into consideration when selecting and designing LED drive power supply: 1. High reliability, especially the drive power supply for LED street lamps, is installed at high altitude, which is inconvenient to maintain and expensive to maintain. 2. High-efficiency LED is an energy-saving product, and the efficiency of driving power should be...
Driver is the core component of LED lighting. With the maturity of LED chip technology, the quality of LED light source has been very reliable. In many cases, the fault of LED lamps is from the driver. High-power LED drive power supply is an emerging industry, and has not formed a centralized industrial cluster. Therefore, the regional nature is not obvious. And the number of enterprises entering the industry is not large, so the degree of competition is low. The efficiency of led driver is...
1. Analyze the high-power LED market from the main application market of high-power LED - landscape lighting. As the largest application market of LED lighting, the landscape lighting market accounts for about 43%. Its new round of rapid growth will certainly drive the rapid development of the overall LED lighting industry. Some large and medium-sized cities, such as Shanghai, Xiamen, Beijing, Dalian and Nanchang, have completed a considerable number of LED lighting demonstration projects. 2....
1. Because LED is a characteristic sensitive semiconductor device and has negative temperature characteristics, LED driver power supply (also called driver) is to protect its stable working state during the application process. 2. LED devices have almost strict requirements for driving power supply. Unlike ordinary incandescent bulbs, LEDs can be directly connected to 220V AC mains power. LED is driven by low voltage. It is necessary to design complex conversion circuit. Different LED lamps for...
It is our common LED. There are three types of built-in drivers, one is constant voltage type, the second is cross-flow type, and the last is pulse type. No matter what kind of driver it is, it can help us solve the problem that the current cannot be controlled LED is our common light emitting diode. There are three types of drivers in it, one is constant voltage type, the second is cross flow type, and the last is pulse type driver. No matter which type of led driver can help us solve the...
LED drive power options: The load characteristics of the LED itself greatly affect the reliability of driving it with a switching power supply. The LED load characteristics, ie, volt-ampere characteristics, are diode characteristics. In a certain interval, the voltage across the LED rises, making its current growth exponential, explosive growth. Therefore, many LED lamps driven by switching power supplies exhibit many unstable characteristics. The reason is that the output of the switching...
Driven by the wave of green and low-carbon economy in China and even in the world, led by the rapid development of LED downstream applications, China's LED driver chip market has achieved stable and high-speed growth even during the economic crisis. In 2010, the total size of China's LED driver chip market reached 1.34 billion yuan, a year-on-year increase of 35.5%. From 2007 to 2010, China's LED driver chip market reached an average annual growth rate of 30.1%, achieving rapid market growth in...
The LED is a solid-state light source. When a forward voltage is applied across the LED, the minority carrier and the majority carrier in the semiconductor are recombined, and the excess energy emitted will cause photon emission. Different materials can be used to make light emitting diodes in different colors. As a new light source, in recent years, major companies and research institutes have been in the ascendant in LED research, which has greatly improved their light efficiency. Lumiled has...
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