Tungsten incandescent lamps will be canceled, many people have nostalgia for more than 100 years of incandescent lamps, LED lighting will eventually replace tungsten incandescent lamps, which is the inevitable trend of modern technology development. 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.
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.
The technologically innovative LED filament package technology was developed based on the concept of HVLED. N low-power LED dies are packaged in series on a glass substrate, making it a new package different from the previous one. Taiwan Jingyuan first proposed a new concept of LED filaments. The LED cores of N ELCs were packaged on the substrate of glass columns, and they were connected in series with gold wires to form high-voltage HVLED modules, spacer mirrors, and coated with yellow phosphors. wrap.
The innovative design of Continental LED engineers is to package N low-power LED dies directly on a glass column substrate. For example, 28 0.02W 1016 LED dies are packaged on a glass column substrate with a length of 38mm and a diameter of 1.5-1.6mm, and are connected in series by gold wires. The LED filament column has VF=3.2X28=89.6V and IF=10mA. The biggest feature of the LED filament column is 360 degree full-angle illumination, which is driven by high voltage (75-90VDC) and small current (10-15mA). High-quality LED dies can produce high-brightness (75-95lm), high-efficiency (120-130lm/W), high color rendering index (90-95Ra), high reliability LED filament column; for blue and red The LED dies can be mixed in different proportions to produce LED filaments with different color temperatures (2870-6020K). The structure of the high-voltage LED filament column is shown in Figure 3. The blue + red dies of the LED are packaged on the glass column substrate, arranged according to a preset rule, and the lead electrodes are arranged at both ends. After the gold wires are connected in series, the yellow or yellow green is sprayed. The phosphor is wrapped all over. Pay attention to high voltage protection during the power-on test. This kind of LED filament column is working in a small current and low power state of 10-15 mA. The whole LED filament column is in a suspended contact with the whole air, the heat dissipation is smooth, the heat is very low, and it is basically not hot.
LED filament bulb
It is very easy to design a variety of small and medium power LED bulbs using LED filaments. Taking the candle light as an example, two LED filament strings can be designed in series to be 360? The light-emitting 1.8W candle light has an illumination brightness equivalent to an 8-10W incandescent lamp (Figure 4). Two strings of two and four LED filaments can be designed as 360? The illuminating 3.6W bulb lamp is equivalent to a 22W incandescent lamp.
Any incandescent lamp factory can use the existing technology and assembly line to produce LED filament bulbs, use the original glass bracket of incandescent lamps to design the connection of LED filaments; use special glass with high transmittance of incandescent lamps, and automatically blow Glass bulb production technology, design and production of bulbs like incandescent lamps, which can produce LED filament bulbs with good cost performance, and a new generation of glass decorative lamps that are favored by European and American markets and have good profits.
LED filament light bulb design technology
The design technology of LED filament bulbs includes the design of LED filament column, the design of driving power supply, and the design of glass bulb. The LED filament column is professionally designed and produced by the LED packaging factory. The traditional incandescent lamp factory is not suitable for re-investing in LED packaging. If the incandescent lamp factory has an electronic engineer, it can design and produce the driving power supply by itself. The driving power chip company will generally provide applicable A variety of power solutions that can be used in production; early-stage off-the-shelf drive power can be purchased to reduce the risk of initial production.
The system structure of LED filament bulb is shown in Figure 6. It consists of LED filament column, driving power supply, glass lamp post bracket, glass bulb and standard lamp head hardware. It is a low-cost device that can produce the cheap price needed for mass lighting. LED lighting fixtures. Such as 1.8W LED filament candle light, BOM cost is below RMB10; 3.6W LED filament bulb, BOM cost is below RMB15.
Drive power selection
The LED light source must be driven with a constant DC current to stabilize illumination without flicker. For the selection of the driving power supply, it is recommended to use a non-isolated switching constant current source. Its advantages are high efficiency, good PF, high chip integration and simple application circuit. Such as BP2831/2832, high functional integration, built-in MOSFET, high PF value, application circuit is very simple, the number of original devices in the periphery is only 14, high reliability, excellent linearity adjustment, load regulation, energy Through conduction and radiation, the PCB board area is Φ25mm, and the entire power supply cost is below RMB 2.50 (Figure 7).
The Shanghai High-end Forum on the Subversion of the LED Lighting Industry Development Trends held in Changzhou, attended by more than 200 lighting sales channels from all over the country. The channel merchants are enthusiastic about the various cost-effective LED filament bulbs. A bag of sample lights per person is not enough? Can ordinary people really like LED filament bulbs? It is also subject to inspections at home and abroad, and retail prices may be key.
LED filament bulb lamp, it really has a very strong incandescent lamp taste! Creating a warm atmosphere is indispensable!
LED filament bulbs are also a fragrant scent of modern LED lighting fixtures. They are also in line with the needs of some people who miss the incandescent lamp. It will certainly occupy a part of the market. For the manufacturers who have done incandescent lamps for decades, it is undoubtedly an opportunity to once again take advantage of the LED lighting industry! Grasping the opportunity will make your own destiny and your own industry once again brilliant!
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