LED lighting application brightness and power improvement
Under the global energy saving and carbon reduction boom, LED lighting applications based on semiconductor technology are the most popular energy-saving solutions in daily lighting applications, because LED lighting has small size and high brightness, and creative lighting can be made with the setting conditions Modeling, but as the brightness and driving power of LED components increase, it is necessary to strengthen the protection design of the driving circuit.
According to Forbes forecast, the LED lighting application market will continue to grow in the next 5 years, and the global share of the LED market is expected to reach more than 70% by 2020. Because of the rise of environmental protection concepts, key cities around the world have successively introduced LEDs to replace traditional public lighting applications. For example, London, UK, announced that by 2016, it will complete the street modern lighting improvement plan, which will introduce 350,000 urban street lights to LED lighting fixtures.
LED lighting applications are becoming more and more popular
LED lighting applications are becoming more and more popular. With the upgrading of LED lighting applications, the unit brightness and power of LEDs are getting higher and higher. In addition to the heat dissipation requirements of the LED chip during operation, high currents are required to drive high-brightness LEDs. Drive circuit design, because the lighting products are often used continuously for more than 8 hours, the safety of the drive circuit is even more important.
In indoor lighting applications, the most common standard LED lighting for decoration applications, the driving power ranges from 8W to 15W. Although indoor lamps are still driven by low power, the power supply circuit is in addition to the conventional safety design, because this type of decoration Lamps are mostly installed in closed wooden furniture. In addition to the overload and short-circuit protection design of the power circuit, it is also necessary to protect the lamp from power failure under high temperature conditions to prevent the lamp from malfunctioning or high heat, and the power circuit is still continuous The transmission of driving power leads to aggravation of the problem.
COB component packaging improves the light shape of LED lighting and simplifies drive design
Some of the larger size of the lamp products, the driving power can be as high as 20W or more. Generally, this kind of high-brightness lamp is usually used as the main lighting lamp in a large space. The characteristic of this kind of lamp products is that a single lamp has a very high Brightness performance, through a certain number of main lights with sufficient environmental lighting applications. Such functional lamps usually do not use too complicated designs, and generally use COB (Chip On Board) packaged high-brightness LED components to obtain high-brightness lighting, simplify circuit design, and optimize cost structure advantages.
However, a single group of light-emitting elements must be driven with a power supply of up to 20W. It is not easy for LED lighting whose miniaturization and cost optimization are the primary design guidelines. The actual installation cannot be directly connected to the driver with a low-output power drive module. Avoid overload fault of the drive circuit. Another important point is that for this type of indoor main lighting applications, LED power drivers generally require a single lamp to be equipped with a set of power drive circuits. The use of a distributed configuration of drive circuits not only makes the power drive circuit more streamlined, but also does not cause driving due to too many lamps connected. Circuit overload problem.
Power safety design can protect LED components to avoid damage to driving problems
In general LED drive power supply design, common protection components include fuse, varistor, lightning surge protector combined with varistor and transient voltage suppressor (TVS) and other protection components. In the driving circuit through the protection design, the LED light-emitting element is a semiconductor material after all, and it is more sensitive to voltage/current transient response. If the power supply changes greatly, the light-emitting element will be penetrated or burned by high current through the protection circuit. The technology can quickly cut off or bypass the power supply in the event of a transient change in the power supply to avoid damage to the LED light-emitting elements.
Compared with indoor LED lighting fixtures, the design requirements of related drive circuits for outdoor LED lighting applications are significantly higher. Because outdoor LED lighting fixtures, which may be building exterior wall lighting, landscaping design lighting, or street lamps/indicator lighting applications, are often driven by direct connection to the mains grid. Based on outdoor lighting requirements, because the lighting fixtures are installed at a higher height, the lighting block may be set in a wide street or park, and the brightness of the fixtures will be higher.