LED lighting seeks to break through the barriers of the domestic market competition

Cost is the biggest obstacle for led to enter the domestic market

Maxim company HBLED product line manager PieroBianco

Compared with the commercial lighting applications, the huge consumer group makes the LED home lighting market extremely concerned, but the home market is extremely sensitive to the cost, which led to its slow development. Maxim HBLED product line business manager PieroBianco pointed out that the key factor restricting LED lighting into the home application is the cost. In order to compete for market share with other technologies, which are the main competing products, the price of LED lamps must be controlled below 10 to $15. TI (TI) senior technical market development engineer Liu Xuechao also agree with this, although the cost of LED is gradually reduced, but compared with the traditional CFL energy-saving lamps, there is a certain price gap. "

TI senior technical marketing engineer Liu Xuechao

The high cost of LED bulbs comes mainly from three aspects, including high-power LED light source, LED control chip and the light bulb shell material used to achieve good heat dissipation. One of the effective ways to reduce the cost of the whole LED system is to reduce the cost of the drive. According to Maxim's PieroBianco introduction, the use of a single level conversion drive, the direct use of AC power supply, can effectively reduce costs. Another way is to avoid the use of electrolytic capacitors as far as possible in the driver, because the higher the temperature of the LED lamp, we must use advanced electrolytic capacitors to maintain adequate driving circuit life. Therefore, if the driver does not require the use of electrolytic capacitors, it will save the cost. The company has launched a single stage conversion, without electrolytic capacitor LED lamp driver program.

No doubt, the improvement of technical level will help to promote the successful application of LED lighting in the home. The luminous efficiency of high brightness LED has been a huge increase in the past few years, along with the luminous efficiency, service life and reliability of continuous improvement, the attractiveness of the market and the value of application of LED lighting will continue to improve, in the family's adoption rate will therefore gradually increase. In addition to the price, in order to truly competitive products in the home market, high brightness LED lighting solutions must also provide dimmable choice. By increasing the dimming function, so that the user according to the actual need to adjust the brightness of the lamp, but also help to reduce power consumption.

Reliability and thermal design challenges

A Morimi semiconductor lighting and smart grid marketing director Zheng Lekang

When designing a LED lighting system, the key challenge for engineers is to maintain high reliability while reducing costs. A Morimi semiconductor lighting and smart grid marketing director Zheng Lekang said, in order to reduce the cost of home LED lighting system, design engineers tend to use low grade components, such as lower temperature resistance rated capacitance or lower accuracy. If the use of low temperature rated capacitors in the electronic drive section of the home LED lighting system, these lower rated capacitors are likely to fail after a few years (3 to 5 years). So, the final situation will be LED lighting system itself in the LED life of up to 50 thousand to 100 thousand hours (15 to 20 years), but because of the reliability of electronic drives can only survive for 3 to 5 years. Therefore, the engineer should not be at the expense of reliability at the time of design, and ensure the reliability and life of the electronic drive and the reliability and life expectancy of LED.

Technologies LED lighting product line project manager recovery

Good thermal management and efficient driving circuit is an important guarantee to achieve efficient LED lighting system ", otherwise it will be possible to reduce the system reliability, failure or even failure. Efficient thermal management is also necessary for the drive part, which can reduce the loss by reducing the heat output. From the design of the controller to the choice of components, we need to pay attention to. Taiwan science and technology LED lighting product line project manager, deputy manager stressed. Improper heat treatment will accelerate the brightness attenuation, thereby reducing the brightness of the product and service life. In addition, due to the poor working environment of LED lighting (lightning, high temperature, etc.), improve the efficiency and reliability of LED power supply has become a design difficulty.

From traditional lighting to LED lighting must also meet consumer demand for high quality products. Li Qi technology Senior Project Manager Liao Guangbin believes that the demand for LED lighting and traditional lighting products on the power requirements are different, therefore, specifically for the development of LED lighting and power design is very necessary. These requirements include constant current output, Triac dimming, single input multiple output design, low output power high PF value, a new architecture to meet the requirements of high power and low cost, etc.. "

Intersil Senior Application Engineer TamaraSchmitz

Intersil Senior Application Engineer TamaraSchmitz said, consumers require design with at least 90 of the power factor and efficiency of more than 80%. In DC applications, the maximum input voltage may exceed 40V. In AC applications, the input voltage may be 120V or 240V (max 277V). High brightness LED must be driven by running the PWM at the 120Hz frequency to minimize any visible interference. Sometimes you need to change the frequency. In addition to these design constraints, the isolation and non isolation design can be used depending on the application. "Therefore, there is no solution for all applications