Decrypt data center low-power LED lighting device internal structure

Although the industry is now focusing on the development of alternative energy sources or on energy conservation as an important goal, how to “use less” is also a challenge when “creating more” energy. Although the proportion of lighting energy consumption in the overall energy consumption of the data center is not high, people tend to ignore it, but the decimal number is long-term, and it is not a small number. With the maturity of energy-saving bulbs and LED lamp technology, people have more choices, and lighting energy conservation in data centers is increasingly being valued. How to achieve low power consumption compared to general lighting, let us find out.

First, the lower half of the LED bulb is a heat sink

Lighting fixtures using light-emitting diodes (LEDs) as a light source have gradually entered the market due to their low power consumption and long life. Among them, bulb-type LED lighting (hereinafter, referred to as LED bulbs) intended to replace conventional bulbs such as incandescent bulbs and bulb-type fluorescent lamps has recently attracted much attention. Since the unit time price of a bulb calculated according to the life of the LED has been comparable to that of a conventional bulb, updating the existing general lighting fixture of the data center is not difficult to achieve.

Low price does not mean that LED bulbs can abandon the unique advantages of low power consumption and long life. Moreover, if the product is to be based on the market, it needs to have a higher heat dissipation capability.

The light emitted by the LED bulb has less infrared components. Therefore, compared with the incandescent bulb and the bulb type fluorescent lamp, the light irradiation portion is heated slowly. However, the LED itself will generate heat, so the heat dissipation countermeasure is indispensable. Once the allowable temperature of the LED chip is exceeded, the luminous efficiency of the LED will decrease, which will adversely affect the life of the bulb.

From the outside, the characteristics of the LED bulb can be said to be the result of improved heat dissipation. Looking at the LED bulb from the side, more than half of the overall lower side is the heat sink (Figure 1). For example, some brands use radiators made of aluminum alloy castings, and compare the LED bulb radiators of the two manufacturers A and B.

Comparing the heat sinks of the two, in addition to the color, the shape difference is also very obvious. Although the B product is slightly more in terms of height, the radiator channel area is larger for the A product. The channel depth of the A product gradually increases from bottom to top, while the B product has a basic upper and lower contour.

The larger the surface area of ​​the heat sink, the higher the heat dissipation performance. In the case of a limited external dimension, increasing the channel depth is one of the methods of increasing the surface area, but as the channel depth increases, the internal mounting space of the power circuit substrate, the resin case, and the like is reduced.

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