led lighting modules: taking the heat out of the situation

by:Getian     2020-08-07
The appeal of using led in lighting applications is growing rapidly.
The numerous notable benefits of using modules containing led matrices have been recognized by design engineers in several key industries such as aerospace, building lighting, and the automotive market at golf golden automotive.
Features such as flexible design, low power consumption, uniform and reliable light, long life distinguish LED modules from designs based on traditional filament lamps and fluorescent tubes.
Led can also have a knock
The size and complexity of the module are greatly reduced, and the lens design is simplified.
A good example of some of the other benefits of LED lighting is the application in the aircraft cabin.
Modified LED unit for replacement of fluorescent-
The tube lighting module achieves fine-controlled dimming by using LEDs of different colors and provides mood lighting.
When implementing a module design using led, thermal management is probably the most challenging issue and is managing the temperature of a single device knot while it is in normal operation.
If the considerable amount of heat generated by all devices in the module is not properly managed, then the junction temperature may reach the level of reduced leds life expectancy and impaired reliability (see Links).
LED modules are usually made up of many surface mounting devices.
These LEDs are welded to an etched copper layer that provides an interconnect between a single LEDs and other passive and active elements needed to complete the circuit.
The small size of the Led and the proximity to install them means that the designer has a lot of design freedom and can achieve complex lighting modes with high brightness.
The etched copper circuit is separated from the substrate, which is usually made of a dielectric material with high thermal efficiency and electrical isolation.
The properties and capabilities of the dielectric layer are the key to the flexibility and performance of the entire module design.
The dielectric material is made by mixing thermal efficiency materials such as alumina and bn with other components to provide a flexible but elastic coating on the substrate.
An important feature of the dielectric layer is the amount of electrical isolation it provides between the copper at the top and the metal substrate at the bottom.
This is the so-called dielectric strength.
Typical dielectric materials may have a dielectric strength of about 800 V/mil and are coated on a substrate with a thickness of 8 mil12 mils (
1 mil = 1 print 3 = 25. 4 µm).
The dielectric material used on the insulated metal circuit board usually has a thermal conductivity diagram in the 3 w/mK area.
This is about 10 times the performance of the FR4 implementation (
Flame retardant woven glass reinforced epoxy resin)PCB material.
Another key requirement of the dielectric layer is the ability to compensate the copper track at the top of the Assembly and the different expansion coefficient bottom of the aluminum substrate/radiator. Going three-
The size plate of the insulated metal circuit board consisting of copper foil, dielectric layer and aluminum substrate has been in history for several years.
In the eyes of the striker
LED module designers believe that the main problem is that the plates of insulated metal circuit boards limit their 2D shapes.
To address these limitations, new dielectric materials with low modulus become available, meaning that they conform to mechanical stress and strain.
These materials not only hold the coefficient of expansion of metal elements in the building, but also enable the parts to form at right angles, even through Jingdong.
This enables designers to implement complex
The design of the shape and those that form a complete circle with internal or external copper traces.
When designing with new, forming insulating metal circuit board materials, the track can be bypassed around the corner, which reduces the need to use connectors and hard wiring.
There are several benefits to this, including improved reliability due to less connectivity and connectivity.
Although the cost of new materials is slightly higher, the assembly time is also reduced due to fewer components required, so the overall cost is reduced.
The strength and durability of the Led itself is durable.
Installing them on a metal-based circuit board will only enhance the robustness of them and the finished module, thus providing excellent resistance to vibration and mechanical shock.
The automotive lighting cluster provides a good example of how LED modules provide superior performance compared to conventional filament lights. On-
Vehicle Applications experience a high level of vibration and a wide range of operating temperatures, which can cause premature failure of wire lights.
The led can last 100,000 hours under certain operating conditions, which means that no attention is required in the service life of the vehicle.
The long life of the Led also simplifies the task of the designer, as it is not important to make the lighting module available for finished repair.
This enables a cleaner, more integrated installation and saves potential costs.
Before working on manufacturing, the thermal analysis package for temperature modeling can help to prove the design of LED-based modules.
These packages collect data from the integrated database about LED performance and specifications, as well as data from other devices installed on insulated metal circuit boards.
This data is combined with other information about the design elements, including copper traces, power and ground planes, and vias.
Then, the sorted information is processed to produce an accurate representation of the design thermal performance. User-
A friendly graphical representation of results enables design engineers to quickly identify areas that may need attention, all the way to the components and tracking levels.
By helping to speed up time to market and reduce the number of iterations required to reach production, thermal analysis software can bring significant commercial and design benefitsready solution.
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