Analysis of the current situation of LED panel light driving power supply

According to the survey data, at present, in the emerging projects in China, LED penetration in outdoor lighting has almost reached 100, and the penetration rate in public indoor lighting projects has exceeded 80, and in home decoration, it has penetrated 100%. As the integrated ceiling industry based on the home improvement market at the present stage, LED lighting and decoration technology has been fully applied, and the popularization and application of LED light sources is an indisputable fact. In the development of integrated ceilings in the past ten years, in the lighting application, the incandescent bulb quartz halogen spotlight module electronic fluorescent lamp module LED straw hat lamp bead module experienced by Yuba, to today mainly use side-illuminated LED panel light-based lighting and more The evolution of the functional combination module, its development process, on the one hand, is the continuous improvement of lighting technology, and more importantly, the consumer market's cognitive progress and consumer demand for lighting lighting. However, in the trend of rapid development of the integrated ceiling industry and the popularization of LED applications, there is no standard for LED panel lights, government technical supervision is missing, some speculators are rushing, and there is no technology, no research and development, no Quality control, no bottom limit, a table, two spiral cones, three or four people, a large number of rough and shoddy workshops. In the market, there are a lot of LED panel lights with short life span, poor light color and light leakage, and even electric leakage accidents. Users complained constantly, dealers have no door after sale, which greatly hurt the market's confidence in LED panel lights and affect the health of the industry. development of. Here, let us dissect the LED panel lamp market from the technical point of view, especially the LED panel lamp market in the integrated ceiling industry. First, the LED light source device used in LED panel light has the characteristics of small size, suitable power, high light efficiency, easy light control and heat dissipation. The current LED panel light is from the earliest 3528 to the later 3014, 2835. SMD4014 lamp beads are used. We have thoroughly understood and sampled the LED lamp beads used in the multi-layer factory in the integrated ceiling industry. Many workshops in the industry use low quality lamps with low quality and low quality. The chip size is small (the excellent 4014 lamp bead chip size is 10*30, while the low quality lamp bead chip size is below 10*18), the light output is low; at the same time, the encapsulant colloid and phosphor are low-cost configuration, and the copper wire with small melting point (the quality lamp bead is made of gold wire), Iron bracket (quality lamp bead is made of copper bracket or high thermal conductivity synthetic material), so it is easy to appear light decay in the process of use (that is, it is brighter at first, slowly not bright):), even blown Dead lights also occur frequently. At the same time, in the integrated ceiling distribution center of a certain town in a certain city, there are special underground factories in Shenzhen and other places to collect unqualified lamp beads from various packaging manufacturers, and use inferior substrates for patching, and then like cabbage in the street The products sold to local LED lamp assembly workshops have low light efficiency (common consumers are difficult to distinguish without contrast), poor color temperature consistency, and large color drift, and there are many problems. Second, the status quo of the core component drive power Because the LED lamp bead is a low-voltage start-up semiconductor device, the most basic requirement is to use a matched low-voltage power supply drive, and requires a constant constant current, the current is too high, the light decays fast, the time is slightly longer The lights are very dark and even burned. At present, LED driver power supply mainly has three technical solutions: 1. Resistor-capacitance and buck: the scheme is simple, the device is small, the cost is low, and the constant current is not constant. Mainly used 3W and below LED lamp configuration, and there is danger of leakage caused by breakdown of the lamp board, so the structure of the lamp body must be insulated; 2. Non-isolated power supply: moderate cost, IC constant current, but also breakdown The risk of electric leakage also requires that the structural housing of the lamp body be insulated. 3. Isolated power supply: high cost, IC constant current, good security. In order to achieve better light extraction efficiency, the LED panel lamp generally has a slender strip structure. Therefore, in order to ensure the heat dissipation of the LED lamp, the all-aluminum structure is used as a cavity and has a heat dissipation effect. For the non-insulation of the aluminum lamp body, it is necessary to use an isolated power supply to provide basic safety protection, and at the same time provide a constant and constant current to ensure the long life of the lamp bead. At present, there is no limit in the integrated ceiling industry, which is to cut corners, use resistive voltage reduction, and also use non-isolated constant current power supply; in order to cover the market, it also uses inferior colloids, which is famous for its moisture-proof and waterproof. Fear of poor driving schemes. At the same time, the same is the isolated constant current power supply, there are also advantages and disadvantages such as whether the solution is reasonable, the configuration is complete, the device is stable, the circuit is scientific, and the process is rigorous. Here, only the circuit board, the poor quality drive uses the paper core board, it is easy to absorb moisture, in the process of use, it is easy to cause the line short-circuit burned; and the high-quality drive uses the glass fiber board, which has the advantages of stable line, moistureproof and durable. . In the driving production process, the high-quality drive of the standard manufacturer adopts automatic patching and automatic wave soldering, no confusion, no virtual welding, which is unsatisfactory for the workshop process of inferior products.

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