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November 21st, 2009 admin

Temperature+Led

High Brightness LED Lights Will Be Important Development Trend by Cheyer

At present domestic LED drive IC lighting development manufacturers have more than 10. The characteristics of the driver IC LED requirement are the consistency of the output current with constant qualitative. At present domestic lighting LED drive IC products technology or the use of the traditional DC/DC step-down, boost constant current model, and by the PWM controller composition constant current source circuit, the second LED drive IC technology is still at the initial stage of development of the product, especially limited to low voltage of a wafer production process, the influence of the great demand for increasingly higher voltage applications. With the lighting of the application of expansion drive IC is LED flashlight to the senior and highly integrated, PWM technology development direction.

In recent years, high brightness LED ensures application development, especially in the sign, the traffic lights. And for automobile application, LED is also very attractive, long service life, high efficiency, of a source of the earthquake, good control ability, is its advantage. In the market demand, car lighting use LED has a big quantity. Because of its power supply voltage stabilizer from car batteries, generally for 48 V, it is mostly series and parallel drive, need a higher voltage, for 48 V car battery power is very convenient. At present 60 V of the high pressure can drive IC new product has LED a more common. Of course, relative to incandescent lamp, LED needs to drive circuit, a car by lead acid storage battery electric power supply, is the mechanical drive of the charging alternator, this kind of battery for incandescent lamp, not applicable LED, therefore, the design of a good performance and low voltage driving circuit noise is very necessary.

In the vehicle LED, because cooling technology constantly breakthrough, main components sustained cost reduction, so the use of the car driver IC LED will increase.

The future LED the head lights will also from advanced type, extending to general car. And before the car pack market directly using LED backlighting, front and rear panel | instrument, the third the brake lights, fog lamps, and the direction of the light is a promising market tail lights.
LED the development of the drive faces two big technology barrier: heat and size

The development of LED driver also exist great challenge, because LED itself is linear elements, so at present mainly are faced with the problem: the first, the forward voltage with current and temperature changes; Second, different device of positive voltage has differences; Third, the color with current and point of the change of the temperature drift; Fourth, LED specification requirements must be within the scope of work, so as to realize the reliable work.

LED drive technology with LED flashlight chip progress make the LED power more and more amazing. The brightness is more and more high, its application is becoming more and more widely. From the early instrument instructions into LCD screen backlighting, flashlight, auto show, lighting, decorative lamp and so on, until general lighting applications, such as the berth lamp, table lamp, fluorescent lamp and lamp, etc. In the future, LED drive IC will be expanded to more applications.