The circuit board is an important part of the LED tube, which acts as a needle lead for the heat dissipation of the tube. The circuit boards commonly used in LED tubes are mainly divided into two types, one is a glass fiber board and the other is an aluminum substrate. Next, Dongguan Minghao analyzes the difference between the glass fiber board and the aluminum substrate for you:
1. Fiberglass board: In order to gain an advantage in price, some manufacturers use glass brazing sheets as PCB boards for LED tubes. Glass brazing sheets can be subdivided into glass fiberboard, double-sided copper foil fiberglass board, perforated copper foil fiberglass board, and single-sided copper foil fiberglass board according to different materials and manufacturing processes.
Due to these factors, LED lamp prices will be directly affected. There is also a cost-saving approach at the expense of heat dissipation by placing the circuit directly on the glass plate. The LED tubes made of these circuit boards are cheaper than the aluminum substrates in terms of price, but the heat dissipation effect is not as good as that of the aluminum substrates.
2. Aluminum substrate: It can be divided into three layers from the manufacturing structure. The uppermost layer is the circuit board layer, the middle is the heat conduction and insulation layer, and the bottom is the aluminum base layer. Most of the LED lamps on the market currently use this circuit board.
A. The circuit board layer generally uses copper foil as a conductive circuit, and copper has good electrical conductivity and the price is relatively high. In order to save costs, some manufacturers have made the copper foil thinner, so the conductivity will also be affected.
B. The heat conduction and insulation layers vary greatly depending on the materials. If the heat conduction and insulation are very good, special ceramic polymers can be used, but the price of this material is very expensive, which is difficult for many manufacturers to accept. Therefore, other materials with high cost performance are sought to reduce costs, such as epoxy resin and glass cloth.
C. The aluminum base layer can be made of copper plate and aluminum plate, and the heat dissipation effect of the copper plate is relatively good, and the cost is relatively high. In consideration of the price factor, the aluminum substrate is generally made of an aluminum plate, which has good heat conductivity and is not easily bent.
In summary, the biggest natural enemy of LED is heat dissipation, LED tube needs sufficient heat dissipation to ensure luminous efficiency, and the circuit board with good thermal conductivity can extend the service life of LED tube. Therefore, high-quality LED tubes must be equipped with aluminum substrates with high heat dissipation coefficient. The heat conduction is fast, the heat dissipation is fast, the aluminum substrate is good, and the heat dissipation is good. However, the price of the aluminum substrate is higher than that of the glass fiber board, and the customer can customize according to their own products. The selling price is to consider which circuit board to use.
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