作者：Blade

How to test the reliability of high power led driver

 

How to test the reliability of high power led driver

 

So, really high quality LED driver power supply should have what kind of features or to meet those requirements? Tektronix summed up the following main aspects:

 

(1) high reliability and life: the life of the drive power to the life of the LED relative to adaptation, in particular, like the drive power of the high power led driver installed at high altitude, maintenance inconvenient, the maintenance cost is also large;

(2) High efficiency: the structure of power supply installed in the LED lighting, which is especially important. LED luminous efficiency of high power led driver temperature decreases, so the LED heat dissipation is very important. High efficiency power supply, the loss power, heat lamps, reduces the temperature rise of the lamps is beneficial to delay the LED light failure.

(3) high power factor: With the increasing demands of the community’s quality of power supply, people are increasingly concerned about the electrical equipment of power quality and harmonics. Such as the EU has issued standards require power greater than 25W power supply must have a power factor correction circuit. And many other countries for 30 ~ 40W LED driver power supply, It is said that soon will also may power factor of a certain indicator.

(4) constant current driver: It is now common, there are two: one is a constant voltage source for the constant current source, each constant current source separately to each high power led driver. In this way the combination of flexible, all the way to the LED fault, does not affect the other LED’s work (led high bay lights), but the cost will be slightly higher.

 

How to improve the power factor of high power gu10 led

 

How to improve the power factor of high power gu10 led

 

The measurement of drive power, input power, power factor and harmonic There are many ways to use power analysis capabilities of the Tektronix oscilloscope products you can easily achieve these power quality measurements. Channel to measure the input voltage and channel all the way to measure the input current with the oscilloscope’s built-in PWR power analysis software, all power quality parameters can be displayed directly on the screen.

 

Drive power efficiency of high power gu10 led and power within the switching losses are directly related. Reduce the loss of power devices is not only improved power efficiency, but also a key factor to improve the thermal stability and reliability. However, the switching losses of power device measurement is not easy to achieve. As the device turns on and off state of the voltage amplitude difference between high power gu10 led and led high bay lights in such a large dynamic range can not accurately measure the tiny voltage-state conduction losses is no way of measuring.

 

For high speed switching power devices, can only be multiplied by the voltage and current transient power approach to computing power. Then the voltage and current must be the same moment of the waveform, otherwise the error is huge. However, the principle and structure of the voltage and current probes for high-speed switching signal time delay. If you can not accurately correct for high power gu10 led, the measurement results of the oscilloscope is not credible. Tektronix oscilloscope power measurement scheme not only has a comprehensive test function of the switching loss, also has a powerful probe calibration function to completely eliminate the time delay error.

PWM analysis for high power led bicycle lights

 

PWM analysis for high power led bicycle lights

 

Home truly energy-efficient LED lighting products, ultimately to have a dimming feature, Europe and the United States and other high-end market demand in other countries and markets in the future will be the gradual popularization. The latest technology in LED dimming PWM, by a different pulse width of the PWM signal to control the ratio of the power device is switched on and off, thereby to adjust the output luminous flux. Compared to other dimming and PWM dimming without changing the LED current flowing through the size, the lamps will not cast, but also to avoid the loss of resistance dimming energy, maintaining the high efficiency of high power led bicycle lights.

 

Tektronix AFG3000 any, waveform generator can easily generate a PWM signal, the user can change the PWM changes the form of the output pulse width ratio and variation, all the operation only on the panel pressed a button, the impedance of the generator built-in the adjustment function can be adapted to the circuit needs.

 

Ripple is added to the AC voltage on the DC output voltage, the led high bay power supply testing is an important measurement parameters. Ripple current increases, power costs are lower, but the light output would be affected, and will improve the LED junction temperature and thus affect the LED performance, or even seriously reduce the life of the high power led bicycle lights (experience has shown, the junction temperature is increased by 10 ℃ life is shortened by half). Therefore, accurate measurement of the ripple is very important. Tektronix oscilloscope power test program has a ripple measurement can be a key to complete the ripple parameters were measured. For high-end applications, the Tektronix TCPXX Series current probes are available as low as 1mA of ripple current measurement accuracy, cost-effective probe for selection for cost-sensitive applications.

Dimmable led downlight: an art for lighting, space and life

 

Dimmable led downlight: an art for lighting, space and life

 

From an export point of view, because the Dimmable led downlight just entered, in fact 90 percent or export, the domestic market accounted for 10% to 15%.

 

I would like a large optical Co., Ltd. 67 years focus on the lighting industry, our cooperation, can the Chinese market to promote the good. I would like that we have exported to Europe and the United States high-end Dimmable led downlight at the same time, we have to take these products into China. Great light, Ltd. has more than 100 lighting designers, one after another, they will be stationed in this building, lighting design services for our industry to make. The lighting design industry in particular, Taiwan’s point of view, there is no specialized university or a specialist to teaching, including this one, as the lighting designer a few, there are already three light lighting designers the building was officially work, not yet open, overwhelmed. Many design firms, there are many customers, one that you have a lighting design, it quickly to help me design because they all do not know. Understand the people of the light does not necessarily understand the led high bay lights, Bright China is sold out, not sell lights, our lighting design is to go in front. Lighting design to have a strong product, you do not have the products and resources there is no way to do this project. So we need to have a strong team of lighting designers, and also strong lighting products, we already have two advantages, so I think this is a good development opportunity.

 

 

 

The short recovery for LED outdoor lighting after financial crisis

 

The short recovery for LED outdoor lighting after financial crisis

 

In fact, the LED outdoor lighting is now even to recovery, to determine the will is much easier than the traditional fluorescent lamp recycling. Because first it is small size, its recycling process, can cause environmental pollution, toxic substances and almost very little in the manufacture of chips, there will be some environmental pollution, The chip has been completed by a, it pollution rarely. The remaining is how to make the LED’s long life, there are many companies doing LED.

 

Second, even if you buy a company, although the guarantee of three years, Ye Hao to ensure that a few years or the LED outdoor lighting like the 3C industry, a high attrition rate, I bought this year’s guarantee for three years or five years the middle, if bad, how to be able to find the original production of the chip, which is a big problem. Like BRIGHT lighting declared to guarantee five years, they also doubt bad after five years, a floor 100 led high bay lighting, and finally there are two or one bad, I changed to a new to you. Change to a new to you, does not mean that the 99 LED production time. To solve this problem, each batch of chips produced, it is placed in a constant temperature and humidity inside the warehouse, to ensure that five years after the event of a lamp is broken, we need to identify the original production of the LED outdoor lighting chip to replace the bird lamp. So we dare to make this guarantee, to ensure supply to you is the original. This is a special industry, many people ignore.

Low-cost LED lights serve for ordinary people

 

Low-cost LED lights serve for ordinary people

 

Virginia Tech University electrical engineering Ph.D, China Gui Chao said, returning scientists in the future, let the Low-cost LED lights into the homes of ordinary people.

 

LED lights are mainly used in the public block, 10 to 12 hours of local roads, shopping malls, supermarkets, cinemas and other daily illumination time basic. In these areas, energy conservation is necessary.

 

Two years ago, the Wu Lin Yintai shop, to replace all the LED lights, energy-saving effect is very obvious. Previously, the average annual electricity bill of the Wu Lin Yintai shop is 400 to 500 million, the transformation LED fire pans about the $ 1.5 million, but because LED Lantern Festival energy up to 50% to 60% a year can save more than 2 million yuan electricity, then leveled the investment in LED lights.

 

, LED lamps, high brightness, soft light, ultraviolet, more importantly, the heat generated by 2-3 ℃ lower than the general lighting because the lighting produces heat, Wu Lin Yintai stores a year to open 10 air conditioning, replaced all the led high bay lights, air-conditioning opening 8 on.

 

Hangzhou hotels are also fans of the LED lights. Zhejiang Hotel to replace the LED lights, the annual electricity savings of 900,000 yuan.

 

Inventronics chairman of the State “Thousand Talents Program” selected by China Gui tide has calculated that an account: a 40-watt incandescent light, 15-watt energy-saving lamps can achieve, if replaced with LED lights, you can simply 5 watts on the line. Reflected in electricity, 28.5% of a household fluorescent lamps and Low-cost LED lights, at the same brightness, LED fluorescent lamp power consumption is only fluorescent.

Car led lighting are enjoying a Liu Xiang style development

 

Car led lighting are enjoying a Liu Xiang style development

 

China’s Ministry of Finance, Industry and Information Technology, General Administration of Customs and the State Administration of Taxation jointly issued a notice on the adjustment of the major technologies and equipment import tax policy directory, clear the latest revision of this year, the state supports the development of major technical equipment and products Catalog “and” major key components of the car led lighting, raw materials, list of goods “will be implemented from April 1, 2012, domestic enterprises who meet the specified conditions listed in the production of the new directory technology equipment and products import a list of related parts and raw materials, goods, customs duties and import VAT. The adjustment has a positive significance of the two. First, the gradual adjustment of the whole tax policy of the major technologies and equipment for tax exemptions on imported key components, which is conducive to the realization of the import substitution of the major technologies and equipment; is included in major emerging industry for some yet to be developed but the lack of core technology and key equipment directory of the technology and equipment tax policy, contribute to the adjustment of industrial structure, to achieve the rapid development of new energy, high-end equipment, and other emerging industries.

 

Make the domestic LED Enterprise excited state-subsidized policies, the car led lighting industry to benefit significantly, according to the Ministry of Finance, National Development and Reform Commission and the promotion of efficient lighting products, financial subsidies fund management Interim Measures “requirements, in order to encourage LED products promotion of demonstration applications, and further promote green lighting project and energy savings, and guide the healthy and orderly development of the semiconductor led high bay lighting industry.

The development of LED intelligent lighting is just before the dawn

 

The development of LED intelligent lighting is just before the dawn

 

Xu Chen told LED inside “reporter, intelligent lighting concept are mainly two: First, through the sensor, changing the light, light to adapt to people; is light as a transmission medium, and one as acceptor. Intelligent lighting is not just change the luminous body, but a variety of modern technology, communications, sensing, cloud computing, Internet of Things into one to achieve the effect of light is not only light.

 

LEDinside reporter has learned, some domestic enterprises have been somewhat on the concept of smart sensors, multimedia LED intelligent lighting layout. It is reported that the ground on the optical has the combination of sensor and LED lights up, use the phone you can directly control the lighting; Xi’an China has security systems into the led high bay lighting; Mai Rui Optoelectronics in Shenzhen also has multimedia features included in the LED panel lights, and began to promote the overseas pilot.

 

Xu Chen also expressed his doubts: “due to multiple factors such as price intelligent difficult to fully realize the concept of short-term”, the concept of intelligent lighting is limited to some large enterprises, as well as with communications, sensing, and other technical background enterprises. McNair and photovoltaic sales director Sang Hu LED inside said: “The concept looks good, but for most LED intelligent lighting, the lack of maneuverability, and only these internationally renowned companies to multi-functional intelligent lighting a lot of promotion. ”

 

For many lighting companies in the state of a blind catch shrimp, Wenyuan Guangdong University of Technology Professor recommendations, intelligence is the inevitable trend of development for the future, companies can begin from the current constraints of the power of lighting development, by inserting intelligent group watts to achieve the deployment of communications.

Foxconn: the path of own mains led lighting products

 

Foxconn: the path of own mains led lighting products

 

Foxconn 2005 R & D of LED products in 2006, Foxconn around the plant began trial installation of mains led lighting products. “The person said Foxconn investment LED areas, because the Group across the country factories, the local government of the plant has the energy saving requirements. “At that time the production of mains led lighting products only within the Foxconn factory, and near the living area lighting use.”

 

With the gradual improvement of LED technology and product market acceptance, Foxconn also to other businesses OEM LED lighting products. According Foxconn internal According to sources, 2009, Foxconn, Philips, General Electric, the two major international lighting giant LED foundry business income over 200 million yuan.

 

Since domestic and foreign market, the rapid development of mains led lighting applications, but also to gradually improve the business structure of the Foxconn LED application products.

 

The above-mentioned sources, in 2011, the company produces LED lighting products only 50% of the supply of intra-group lighting replacement project, including the lighting of the factory and nearby streets and living area. In 2012, Foxconn LED Division hope that this indicator down to 40%, in order to gradually increase the sales of the export market.

 

Own factory with much more, so LED street lamp, Led high bay lights, LED explosion proof lights has been the strengths of the Foxconn LED lighting. “The person said.

 

Along with the development of mains led lighting products, Foxconn has also entered the field of LED display. LED exhibition organized recently, Foxconn deliberately on display show only a P3 high-definition 3D LED display, high-quality display participation will stop in front of the Foxconn booth.

LED intelligent lights “enjoy” a high cost at the first stage

 

LED intelligent lights “enjoy” a high cost at the first stage

 

LED intelligent lights costs involved in not only the initial cost of the lamps, but also involve the cost of energy consumed by the lamps, the lamps does not work to replace the lamps required labor costs, as well as the average frequency of lamp replacement required. Departure from the concept it is easy to understand why the led high bay light source is about 50 times the price of the incandescent light source, LED traffic lights market start to 28 times, had formed a new industry. Semiconductor lighting a light color, lighting and special lighting, general lighting will be later extended. Specifically, in recent years, semiconductor lighting market will be widely used in a variety of lights, landscape lighting, windows and lighting, architectural lighting, plaza and street beautification, home decorative lighting, public entertainment and beautify the stage effects lighting and other areas.

 

Theoretically LED are light-emitting diode, but in fact the electrical properties of all LED intelligent lights are the differences, many manufacturers are in the looting of the production schedule, grab number; each manufacturer’s production process is inconsistent, even , the same manufacturer at different times of the processes are different; very high purity requirements of the production of light-emitting diode semiconductor materials, semiconductor purity of the raw materials used by different manufacturers there is a difference, which makes the LED intelligent lights luminous intensity is not identical with the drive current, or a big difference, and resistance to the current capacity and heat differences will naturally different.