The heat is led LED manufacturers biggest headache, however, to use the aluminum plate, because the high thermal conductivity of aluminum, heat, and can effectively export the internal heat. Aluminum plate is a unique metal-based CCL, has good thermal conductivity, electrical insulation and mechanical processing properties. We should try to design the PCB close to the aluminum base, thereby reducing the thermal resistance generated some potting.
First, the characteristics of aluminum plate
1 using surface mount technology (SMT);
2 in the circuit design of the thermal diffusion in a very effective treatment;
3 reduce the operating temperature of the product, to improve power density and reliability, extend product life;
4 smaller footprint, lower cost hardware and assembly;
5 to replace the fragile ceramic substrates, to obtain better mechanical durability.
Second, the structure of aluminum plate
Aluminum is a metal clad circuit board material, the copper foil, thermal insulation and the metal substrate composition, its structure is divided into three layers:
Cireuitl.Layer line layer: the equivalent of the common PCB copper clad laminates, copper foil thickness loz line to 10oz.
DiELcctricLayer insulation: insulation layer is a layer of insulating material with low thermal conductivity.
BaseLayer grass roots: a metal substrate, usually chosen by aluminum or copper. Aluminum clad and traditional epoxy glass cloth laminated boards.
Circuit layer (ie, copper) are usually formed through etching printed circuit, so that all components connected component, under normal circumstances, the circuit layer requires a large current carrying capacity, which should be used thick copper foil, the thickness of 35μm ~ 280μm; thermal insulating layer is aluminum plate core technology lies, it is usually filled by a special ceramic special polymer composition, thermal resistance, viscoelastic properties, excellent resistance to thermal aging, with the ability to withstand mechanical and thermal stress.
High-performance thermal insulation aluminum plate is the use of this technology, it has very good thermal conductivity and high strength electrical insulation; metal is aluminum plate support grass-roots component, requires a high thermal conductivity, aluminum is generally board can also use copper (copper which can provide better thermal conductivity), suitable for drilling, punching and cutting other conventional machining. Compared with PCB material advantages over other materials. Surface mount SMT components for the power of public arts. No radiator, much smaller, cooling is very effective, good insulation properties and mechanical properties.
Third, the use of aluminum plate:
Uses: Power Hybrid IC (HIC).
1 audio equipment: input, output amplifier, balanced amplifiers, audio amplifiers, preamplifiers, power amplifiers and so on.
(2) Power Supply: Switching regulator `DC / AC converter` SW regulator.
(3) Communication of electronic equipment: high-frequency electric amplifiers `filter` transmitter circuit.
4 office automation equipment: motor drive, etc.
5 Car: electronic regulator `power` ignition controller.
6 Computer: CPU board `` floppy disk drive power devices.
7 power modules: `converter` solid-state relay rectifier bridges.