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- Electronic technology in LED lighting applications
- Brightness of the LED forward current
- LED remote control lighting
- LED street lamp design of multi-faceted explore
- Blue LED photonic crystal technology principle
- Produce LEDs using photonic crystal
- LED lighting dimming market growth potential
- Color control of LED lighting
- Dynamic dimming impedance with
- LED drive technology
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19 May, 2012
Electronic technology in LED lighting applications
Power specifically refers to the AC-DC constant current switching power supply. AC-DC refers to the conversion of AC to DC, because the LED is actually a semiconductor diode, it is the work of the DC voltage.30w LED there is a feature that is an approximation of the operating current is an exponential function of operating voltage, small voltage fluctuations can cause huge changes in the current, and in severe burning LEDs, so to ensure the safety of LED, you must be a constant operating current . Usually home appliances are constant voltage power supply and 150W LED Red characteristics determines it to be a constant current power supply. In order to improve the reliability of the LED work, we generally isolated switching power supply to achieve the effective isolation of the LED Flood light and the electricity grid. Corresponding to the switching power supply, a class called linear power supply, is now rarely used, the more dominant of the switching power supply efficiency and volume. The switching power supply technology, can conversion efficiency to achieve the 85% or even higher power factor above 0.95, the total harmonic in less than 15%. These indicators we have chosen the basic requirements of the switching power supply.
The light source is LED chip, which is the core component of the LED 500w lighting. In addition to the electrical parameters of the operating current, tube voltage drop, we are more concerned about its optical indicators, such as luminous flux, luminous efficiency, color temperature, color rendering index, the light fades and so on. LED optical performance is closely related to its temperature, the temperature will cause to reduce the luminous efficiency, color temperature drift, life expectancy decreased cooling technology in LED Power Supply 100W is particularly important. Thermodynamic knowledge tells us that the heat of the object only three ways: conduction, convection and radiation. LED chip is fixed to issue a certain wavelength of visible light, so there is no cooling of infrared radiation. The LED heat conduction, accompanied by a certain amount of convective cooling. Reduce the heat conduction of the LED link and reduce the thermal resistance of each link, if necessary, forced air cooling are thermal design considerations.
19 May, 2012
Brightness of the LED forward current
Usually two kinds of LED 300w failure modes possible: light decay (Light degradation) and the overall failure (Total failure). Light decay when the light emission to 50% of its initial value; addition to exceed the allowable maximum junction temperature caused by the overall failure, the overall failure, including: due to the internal open between the chip and the lead frame, chip between the bonding wire, as well as between such as bonding wires and lead frames. Failure of one of the 100w led power is the the LDE resin over-temperature glass lens, and then softening, and then cooling the stress generated by the internal event of an open.
Users understand that these features are very important, especially for its thermal characteristics. I can not help the author to replace the tube in the electronic circuit scene reminds me of the transistor, the LED Flood light 20W as a semiconductor device temperature sensitivity of the beginning of the application, engineering and technical personnel familiar with the tube in the past applications that the transistor - although there are many advantages but its reliability as good as the tube, however, the power of 50W LED Flood Lights 12V/24V is irresistible, with the progress of the application of technology, temperature compensation and negative feedback suppression methods such as temperature drift, and the stable operating point, has become today's transistors and semiconductor integrated circuit technology electronic information technology, core technology. In the field of light source technology, the application of LED technology will also experience how to avoid weaknesses in this process.
19 May, 2012
LED remote control lighting
LED 3w dimming and change the lighting color provides greater design flexibility, ideal for architectural lighting, interior lighting and dimming, energy-efficient street lamps and outdoor lighting applications, such applications can be remote-controlled lighting. These applications can give users a great value-added space, but in order to be successful, the lighting upgrade for the cost of LED Tunnel Light 100W technology at the lowest level in the market. There is no doubt, be able to reuse the existing infrastructure programs must be the most popular program.
The remote control LED lighting applications, the product cost of upgrading infrastructure to control LED lighting wiring. Fortunately, you can use two techniques to negate the need for costly upgrades: LED 100w lights can be controlled through existing power lines through the radio link control or the use of PLC technology.
PLC technology can support the long-distance communications, but when the AC line circuit breaker or transformer does not allow the free transmission of data streams, it may bring some problems. Although wireless communication is not an issue, but the led driver 30w communication frequency limits in the license-free band, the wireless communication distance is also subject to certain restrictions.
18 May, 2012
LED street lamp design of multi-faceted explore
With the lack of continuous consumption of the Earth's energy and resources, greenhouse effect, harmful to the human, the serious pollution of the atmospheric environment of the Earth, the LED 500w of energy saving the voice getting higher and higher. Today's energy conservation in first place, road lighting accounts for about 30% of the entire lighting electricity consumption is closely related to the production and living with people. Urban rural roads will be more open more, the more open the more wide, you need a large variety of energy-saving lamps matched with the accelerated process of urbanization in China, green, efficient, energy saving, long life 30w LED lights gradually into people's vision. Currently, LED lighting technology matures, high-power LED light source efficacy of 80 lm / W, and urban street lighting energy saving possible.
150W LED Red and traditional lighting, it has a point light source, high brightness, narrow-beam output. Therefore, the designers of the new LED lamps will be put forward higher requirements. LED street lamp first to consider the full use of the limited luminous flux to the effective illuminated area. The street light requirements for road lighting, open space beyond the road is not the way of street lighting. Therefore, effective control of light distribution, so that the LED Flood light emitted as a long strip of the band of light along the surface direction spreading, while taking care of the glare generation in the azimuth of the driver to watch the lighting, lamps at 80 ° and 90 ° elevation angle direction of the light intensity shall not exceed 30cd/1000lm and 10cd/1000lm, and regardless of the size of the light flux, the intensity maxima in a 90 ° angle to the direction shall not exceed 1000cd. Therefore, if the light angle without strict control will have a strong glare, high brightness LED Power Supply 100W products and even the body will cause a certain amount of optical radiation hazards.
18 May, 2012
Blue LED photonic crystal technology principle
To avoid Nichia's blue LED 300w and phosphor system technology patents, various companies have invested in to achieve emit white light LED technology, the most anticipated technology is the purpose of UV LED to reach the white, but, UV LED still light leakage and low brightness of the two is not easy to overcome. Makes in addition to continue efforts to resolve the issues related to, have to go to seek other materials or technology to emit white 100w led power technology.
In 1987, the nationality differences and separated in different locations of the two scholars, Eli Yablonovitch and Sajeev John almost the same time found, in theory, electromagnetic wave propagation state of the periodic dielectric structure with band structure, the use of two or more different refraction rate (or dielectric constant) material to make periodic changes to achieve a photonic band material. So LED Flood light 20Wwas found today, after nearly 20 years in various fields has quite a stellar performance, has been much research and development are concerned about a technology.
Current use of the secondary photonic crystals to achieve the complete white LED technology, has started a breakthrough in the development of Photonic the Crystal 50W LED Flood Lights 12V/24V has become the focus of public attention and expect to get rid of the Nichia patent sustenance.
18 May, 2012
Produce LEDs using photonic crystal
In addition, photonic crystals, there are other features. Take advantage of its features, you can create a photonic crystal LEDs. Can generally be divided into two kinds, one is the LED 3w, a laser diode (Laser Diode). LD laser diode part can be divided into photonic crystal DFB laser diode (Photonic crystal DFB LD), and Photonic crystal defect in of LD. The LED Tunnel Light 100W crystal DFB laser diode is a better understanding of the structure of the laser value can be controlled at a very low area to do the launch, like structure must exist in the area of the optical energy gap, but also because it is so, so this structure To achieve commercialization is more difficult.
The use of photonic crystal structure made ??into LED 100w is relatively simple. On photonic crystals is often confusing part is that that is the use of the DFB laser, so people would not use a specific period or wavelength to use? In fact, the answer is wrong. The reason is that the DFB laser with photonic crystal LD, the incident (Incident of) diffraction (Diffracted),, just restricted. However, relative photonic crystal incident angle and the angle of diffracted light is unrestricted. So not using a particular cycle or wavelength to enhance the efficiency of this feature is the led driver 30w is very important.
17 May, 2012
LED lighting dimming market growth potential
With the sustained and rapid development of LED 300w application market, the continued expansion of the range of applications has also led to the continuous improvement of the product requirements, the LED end products on the LED brightness adjustment This feature also is very necessary. Is also such as LED lamps and displays must focus on the link.
Today,100w led power has surely become a mainstream technology. The technology has matured, one of the signs is LED lighting standards and norms have been put forward. Stringent efficiency requirements already exist for quite some time, and will continue to improve. Recently, LED lighting designer's work more difficult, because at the same time meet the following two requirements: both use dimmers for incandescent dimming control, but also to achieve high power factor performance LED brightness adjustment is divided into analog dimming and PWM dimming, the following LED Flood light 20W dimming will be introduced.
Dimming is a very common feature of the lighting system. For incandescent lamps, which can be easily achieved at low cost. The dimming of the LED lights but there is a certain difficulty in the transition to LED lighting for architects and residential users do not want to lose the dimming control should have advantages. This involves knowledge of 50W LED Flood Lights 12V/24V.
The power factor is very important factor, because the high power factor can reduce the loss of the distribution network. Reduce the use of electricity to the environmental impact of the most effective way to reduce waste, and regulatory agencies around the world are further strict power factor specification.
17 May, 2012
Color control of LED lighting
There are many affordable small light sensor on the market today, they can be used to process the information to the MCU. Typically, the sensor has a number of optional color filters used to measure the red, green, blue or white (no filter). Optical sensor output interface with the MCU through a series of methods to connect.
LED 3w technology, there are still a lot of problems does not solve one problem is how to produce high-quality white light. The composition of the white LED includes a phosphor for blue LED can light output is moved to the spectrum band. Many white LED Tunnel Light 100W can not produce high CRI (Color Rendering, the Index, CRI), the parameters used to measure the ability to light true color reproduction.
By mixing two or more colors of the LED 100w light, you can get higher quality white light system. In these multi-color system, the led driver 30w source of each color light output over time and temperature drift. Optical sensors and a small microcontroller (MCU) can be used to maintain a specific color and color temperature (Correlated Color Temperature, CCT).
16 May, 2012
Dynamic dimming impedance with
Traditional dimmers used to drive purely resistive loads, including cutting-edge phase cutting dimmer trailing edge phase cutting dimmer and smart dimmer. As the load is incandescent dimmer power in the 200W-600W. Characteristics of the LED drive power is just the opposite - low-power capacitive loads. Compatible with dimmers,30w LED must provide a resistive or a class of resistive load to the dimmer steady work. Power resistors directly to the resistive load is a traditional solution. Dimming effect of this approach is good, but the main problem is low efficiency. This is contrary to the advantage of high efficiency 150W LED Red. Another common scenario is the use of power factor rectifier technology, the input current follows the input voltage changes, thus providing the class of resistive load. Such programs are often applied in LED Flood light driver applications. For residential and commercial popularity of low-power LED driver, the problem is usually too high input impedance, especially the interaction between the dimmer and drive part of the EMI suppression components often makes it unable to guarantee a large enough input current to maintain the SCR the stability of the work. If the dimming signal is not handled properly it will cause the LED 500w is blinking.
The digital control technology can be flexibly combined with power factor rectifier and dynamic impedance matching method. When the controller detected a dimmer in the presence of the phase angle of dimmer output, the LED Power Supply 100W provides impedance matching to maintain the thyristor conduction. After the completion of the control phase angle judgment, the controller can take advantage of the high impedance turn-off thyristor, power factor rectifier technology to maintain the input waveform
16 May, 2012
LED drive technology
The digital power technology to break through the limitations of the traditional program, the user's requirements can be integrated and optimized to provide a complete solution for the LED driver and dimming control. In this paper, the specific design issues of LED lights to discuss the advantages of digital technology and problem-solving method.
The high efficiency The optocoupler conversion 100w led power circuit to convert the energy from the AC power grid in the form of light required DC for itself. There will be loss of energy in the conversion process. Higher conversion efficiency, the smaller the drive part of the cooling requirements are also lower the loss. Most LED lights filling plastic and aluminum heat sink to solve the heat problem. For users, the high efficiency of the driver program can reduce the cooling costs of the drive circuit to reduce the weight of LED 300w lights. Reduce circuit temperature rise is also beneficial to improve the life of the LED Flood light 20W. The traditional isolation driven program optocouplers to pass the current signal of the secondary side to primary side controller to maintain a stable output current. Secondary side of the detection circuit drive circuit complexity, cost and loss. Optocouplers use also reduces the reliability. Mainstream 50W LED Flood Lights 12V/24V manufacturers are beginning to use an opto-coupler on the primary side feedback technology. At present, digital primary-side technology has matured and has been widely applied. Digital control can achieve precise control of output current with an opto-coupler feedback. Transformer feedback waveform, digital technology can also be achieved trough opening to improve the conversion efficiency.
16 May, 2012
Full solution of the solar-powered LED lawn lamp lighting design ideas
Solar energy as an emerging green energy, with its unparalleled advantages in the rapid popularization and application. As a fourth generation light source, in the city lighting and landscaping, and efficient use of lighting and road lighting, garden lighting, indoor lighting, as well as other various fields. Especially in remote areas without electricity, solar lighting and a more broad application prospects. Most people think that energy-saving lamps can save 4/5 is a great initiative, but also energy saving lamp LED 3w than 1/4, which is the great innovation of the solid light source.
In addition, the LED also has a high quality of light, almost no radiation, reliable and durable, maintenance costs are extremely low and other advantages, is a typical green lighting. The successful development of super bright LED Tunnel Light 100W, which greatly reduces the cost of solar lamps, so as to reach or close to the power frequency alternating current lighting system installed at the beginning of cost quotation, and the protection of the environment, easy installation, safe operation, economic energy-saving advantages. LED 100w light with high efficiency, low heat advantage, has been increasingly used in the lighting field, and showed a trend to replace the traditional lighting.
In western China, the non-trunk road solar street lights, solar garden lights become the size. With the vigorous development of the solar lamps, the "green light" will certainly become a trend.led driver 30wsolar lawn as one of the representatives will be vigorously promoting and applications, this paper describes some of its knowledge, I hope to give you some inspiration.
15 May, 2012
Characteristics of the white LED and phosphor
White 30w LED has dual characteristics of energy saving and environmental protection is generally believed that is a revolutionary light source to replace the heated lamps and fluorescent lamps; the fluorescent materials are key materials for lighting and display devices, especially since the vigorous development of high brightness LED again also be a high priority. White LED has several possible production methods, which produced by the phosphor 150W LED Red to create a simple, easy to drive, low cost, and many other advantages, such as lighting and display applications in the future, it is bound will play a very important role.
There are three common methods to produce white LED, the first one is the red, green, blue, tri-color to do mixed light; second UV LED 500w light and then through the red, green, blue phosphors, and the mixed white light; the third is the use of Blu-ray to hit the yellow phosphor, mixed white. Today's high-brightness LED Flood light majority of the Department of the use of multi-phosphide (InGaAlP, etc.) or nitride (InGaN) and other semiconductor materials made ??of, its luminous color due to light-emitting mechanism and the material limitations of the energy gap, so are the narrow band width of the monochromatic light. Natural lighting and display applications, while the majority need to use a white light source, if the use of LEDs to produce white light, necessary for the application of light and color combinations of technology, before they can reach the purpose to obtain white light. Among the various possible color combination of white LED light, the use of single-chip LED Power Supply 100W (Single-chip LED) combined with various types of fluorescent material to the color change of light and mixed light effect can be described as one of the most convenient, most cost-effective method of application of inorganic phosphors (of Phosphor) produced by white LEDs, generally, also known as PC-white-LED (of Phosphor-converted the white-LEDs).
15 May, 2012
Phosphor
Among the various types of fluorescent materials, light-induced luminescence (Photoluminescence) fluorescent material of the most widely used in LED 300w such material, the so-called light conversion material. Typically, inorganic fluorescence materials but by the host material (Host materials) "," activator / luminescence center (Activators / Luminescent centers) "and" dopant "(Dopants) and other components, which most of the main material from the sulfide , oxides, sulfur oxides, nitrides and oxides of nitrogen composition, activator / luminescence center is mainly for the transition elements or rare earth element ions mainly, as to the common can be applied to the 100w led power fluorescent material,
As mentioned earlier, single-chip white LED necessary for the application of fluorescent materials, lighting required before they can be white, fluorescent material relevant to the single-chip white LED Flood light 20wluminous efficiency, stability, color rendering, color temperature, long life and other features can be described as a very important key materials in the single-chip white LED system.
As for the demand of the important features of the 50W LED Flood Lights 12V/24V with a phosphor that contains: (1) the appropriate excitation spectra (2) the emission spectrum (3) high energy conversion efficiency (4) high stability and other important projects, and the features are as follows
15 May, 2012
Purchase of LED lights with lighting to pay attention to what
1, the brightness of the LED 3w brightness requirements are also different requirements for different occasions and different products. Such as LED lights jewelry counter in a number of large shopping malls, we will have high brightness and some have attractive, and the same decorative LED Tunnel Light 100W spotlights and LED colorful lights with different products can be divided into.
2, the antistatic ability: antistatic ability antistatic ability LED 100w, long life, but the price will be higher. Usually the antistatic best higher than 700V.
3, wavelength and color temperature LED color will be consistent with this combination of large quantities of the lamps is particularly important. The same lamps which do not have much color.
4, the leakage current led driver 30w reverse of the conducting current, we recommend that the leakage current of LED produce
5, Waterproof LED lights for indoor and outdoor requirements is not the same.
14 May, 2012
Understanding of the LED driver topology selection
Control and drive these 30w LED, there are many inconsistencies in the use. For example, the lighting system design or modify existing power schemes and do not take full account of the unique drivers of the HB-LED requirements. If designers want to optimize the advantages of 150W LED Red can provide the technology used to drive and control these devices must be carefully considered, and to provide energy-efficient and cost effective solution. The main components of the HB-LED lighting system, including the LED emitter, power conversion, control and drive, thermal management, as well as numerous applications related to optical components. If you do not fully take into account all of these components, LED lighting systems are less likely to be optimized. LED 500w and most of the light bulb, with a directional light source, so in many applications, the use of the lens, reflector or diffuser to provide the necessary light-emitting pattern and lamps lighting appearance is essential. Similarly, if inappropriate to deal with the problem of thermal management, the working life of the lighting system will be significantly reduced, which offsets the main advantage of using long-life LED. LED Flood light and drive long-term work of the lighting system are equally important. The supply voltage source in the HB-LED lighting design depends on the type of application input. Buildings and indoor lighting, the voltage source is usually the AC mains power.LED Power Supply 100W may be a broad regulator of the power supply, such as low-voltage AC power with battery backup solar panel or AC mains power. In automotive applications, power is usually a lead-acid battery (12Vdc).
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