Tungsten incandescent lamps will be canceled. Many people have been obsessed with incandescent lamps for more than 100 years. LED lighting will eventually replace tungsten incandescent lamps, which is an inevitable trend in the development of modern technology. Nowadays, LED lighting is known to people for energy saving, power saving, pollution-free and high environmental protection. However, because the production cost of LED lighting is high, the retail price of LED lighting is still difficult to make LED lighting into thousands of households; currently, the cooling bottleneck of LED lighting using low-voltage LED lamp beads as a light source has not been solved perfectly. Program. Only by relying on the system technology revolution and technological innovation of LED lighting fixtures can we make breakthroughs in order to create a new generation of more reasonable and more cost-effective LED lighting fixtures for the common people of the whole society to enjoy.
Many people hope that LED lights can be made as light as tungsten incandescent lamps, 360? Fully luminous. This is still difficult to achieve in the current LED lighting fixtures where the low voltage LED lamp bead is the light source. Reforming the shape of LED lamp beads and carrying out innovative design is the way to hope.
Figure 1 Cooling of the LED lamp bead
LED light source packaging technology innovation
Innovative design of LED light source packaging technology is the key to the new generation of LED lighting. Most of the current LED lamps use low-voltage LED lamp beads (LVLED) with low operating voltage (VF=3.2V) and high current (IF=200-700mA). When the LED lamp bead works, only 30% of the electric energy is converted into light energy, and 70% of the electric energy is converted into thermal energy. Therefore, if the heat dissipation of the LED lamp is not well done, a large amount of heat is accumulated so that the lamp cavity is always in a high temperature environment, and the constant current power source is switched. The electrolyte in the electrolytic capacitor is depleted due to high temperature, resulting in failure; the LED lamp beads are prematurely degraded due to long-term exposure to high temperatures.
The birth of HVLED (high-voltage LED) lamp bead technology brings new vitality, new ideas and new design ideas to indoor LED lighting. This will give birth to a lot of whimsical LED lighting new products and new lamps. The biggest feature of HVLED is high voltage (VF=50-280VDC) and small current (IF=20-60mA). Compared with the same power LVLED panel, its heat is much lower. HVLED is a module that connects N low-voltage LED dies in series with high voltage during packaging, and its application is also very convenient.
The package of LED dies ranges from single-core packages to N-die packages, such as COB, COF, etc., and from a series of low-voltage LED modules to a multi-string, multi-core package HVLED module. The packaging technology of LED light sources is constantly innovating.
From the perspective of application technology, COB's LED light source board, its central LED die still has difficulty in heat conduction and poor heat dissipation. LED heat will gather in the center of COB. Therefore, this LED lamp has been used for a long time. The LED dies first undergo light decay. Multi-core packaged HVLEDs can use N-uniform technology on the same power panel. The heat of each HVLED is quickly transmitted by the aluminum substrate. The HVLED works at a small current, and its heat is much lower. The heat dissipation status of the two LED lamp beads is as described in FIG.
Figure 2 ELC die LED filament column
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