Structural characteristics and application analysis of high brightness LED

Although LED is a current device - high brightness LED is no exception, but the car taillights, brakes, steering signal lighting applications can still benefit from the voltage driver structure.

When LED is available for higher efficiency, retail and residential LED indoor lighting will likely be available soon. LED manufacturers are just beginning to solve the problem of high color temperature light source.

Because of the high brightness LED device design, manufacturing process and assembly technology progress of three aspects of the performance of the LED light emitting device has been improved, the cost has been reduced, to improve the performance and reduce the cost of the speed are unforgettable. The design of the PN junction, the re radiation phosphor and the lens structure all contribute to the improvement of the efficiency, and thus to improve the available light output. In the case of high output white light LED, the improvement of wide spectral performance makes people have hope for low maintenance and high efficiency light source for general lighting.

Although it can be compared with the standard fluorescent lamp LED efficiency takes some time, but the LED lamp is also more environmentally friendly products, because it is not the same as fluorescent lamps, mercury is not used.

The environmental advantages of solid state lighting in terms of component and efficiency are not the main market drivers, but they do make the technology and its suppliers a good image.

At the same time, OEM designers and sales staff working in various fields have been expanding the practical application of solid-state lighting, and has been closely watching the market acceptance. However, the end user experience in the cost of living within the solid lighting equipment experience varies, which is different from the traditional lighting equipment. This fact complicates the values of the market. Compared with tungsten bulbs and fluorescent bulbs, the use of high brightness LED cost and maintenance costs are much lower, which can offset the higher initial cost of LED. Although the above argument may be very attractive, but it makes the price first, the other second ideological dominance of the consumer market caused great difficulty in marketing.

Light fixture manufacturers always in their design without considering the thermal management of the bulb, just enough to ensure high temperature convection will not bring the tungsten material around the fire hazard or fixture operator burn hazard. This fact complicates the mass production of high output solid-state lighting devices. However, if the final design is to make the LED light output and the best working life, then the high brightness LED fixture requires a certain thermal design.

Therefore, although not quickly see the high brightness LED to the traditional tungsten filament lamp or fluorescent lamp is extruded from the hardware store and family center on the shelves, but these devices are in the automotive, traffic control, external signs and other market segments, because in all of these areas, high efficiency and long service life of the lamp will obviously increase the value.

High brightness LED cut off angle

In fact, very few people have heard the phrase "early adopters" and "car market segments" in the same sentence two phrases. Some may assert that this juxtaposition is popular in oxymoron. However, high brightness LED for automobile makers brought several notable characteristics, and, although this application is relatively new, but the basic characteristics of most from manufacturing LED indicator - they are much older than similar products and has been well documented, the same principle and similar process.

LED automobile tail lights, turn signal lights, work lights, brake lights can overcome the inherent shortcomings of tungsten filament lamp. The car is usually subject to moderate impact and vibration will shorten the life of the filament. Similarly, the instantaneous surge current caused by the positive temperature coefficient of the filament resistance will accelerate the destruction of the bulb. Thermal cycle - brake lights work an important feature, often shorten the life of incandescent lamp.

The instantaneous surge current of incandescent bulbs also complicates the circuit protection and fault detection. Automobile manufacturers must fuse ratings and fault detection threshold is set to the current large enough value, in order to adapt to the surge current amplitude and duration, without fuse failure or not detect false fault. In contrast, in the car suffered typical amplitude and frequency range of the shock and vibration conditions, the structure of LED filament more durable than. The LGD structure is light in weight and small in size, thereby reducing the mechanical torque generated by shock and vibration. LED size is small, but also allows the car designer to design the lighting is smaller, and it is designed to meet the requirements of the overall design of the car. For example, some car is not to CHMSL (CHMSL) module is installed in the rear, but the use of LED required for small size of this point, the function contained in the trunk lid.

The lighting and control system of the automobile tail light raises several interesting questions, which will appear in the other parts of the controller and the controller. LED is essentially a current device. The electron hole is complex in the presence of the electroluminescent compound and emits photons in the composite. The increase of current will increase the recombination speed and flux output. The efficiency of this process is not 100% (almost up to less than 100%), so the increase of current will increase the self heating of the device by 1-h power consumption. Unless the working conditions are bad, LED generally do not like tungsten lamp as catastrophic failure, but it is often due to aging and darken. Many device designers have defined the life of LED as a time when the light output drops to 50% of the initial value. Overcurrent and overtemperature conditions will speed up the LED life termination, so most device manufacturers recommend that OEM carefully control the LED energy.

These characteristics imply that in order to achieve LED in the car