After years of experience with the lighting manufacturers, often feel that lighting manufacturers do not want to buy a good LED power supply, but do not know how to identify the purchase of LED power in the end is good, but also more worried about whether to spend a high price to buy low quality LED power supply . Therefore, as a lighting manufacturer, the most difficult part of feedback is to purchase LED power supply. Because the quality of the power supply is difficult to detect, it is aging in its own factory for 4 hours, and some even aging for 24-72 hours, but these aging products are often Shipments 3 to 6% or higher for 6 months. What if the quality of the LED power supply is identified? We can identify from the following points: First, the driver chip: IC The core of the driving power supply is the IC. The quality of the IC directly affects the entire power supply. Dachang's driver ICs are all purchased from Jingyuan for large-scale packaging plants. However, Xiaochang's driver IC technology is a direct copy of the company's drive design programs. The small packaging companies are looking for packaging and cannot properly guarantee the entire batch of ICs. The consistency and stability, resulting in the inexplicable failure of the driving power after a period of use. Therefore, the IC on the LED power supply refuses to be polished so that the lighting manufacturers can understand the cost of the IC solution and the calculation drive, and purchase the power supply product at a reasonable price. Second, the transformer The control chip can be considered as the brain center of the power supply, and the power, temperature resistance and the like are the transformers. The transformer is responsible for the completion of AC-magnetic energy-DC power, and the energy overload will saturate the blower. The core of the transformer is the magnetic core and wire package. The quality of the core is the core of the transformer, but as with porcelain, it is extremely difficult to distinguish. The simple appearance is identified as: the appearance of crisp, dense, bright, while the back of grinding pores for the top grade. At present, the core used by Shanghai Nuo is an open-ended PC44 core to ensure high power efficiency. The wire package is made of copper wire winding. The quality of the copper wire used is the key to the life of the transformer. The same length of copper clad aluminum wire is 1/4 of the price of pure copper wire. Due to cost pressure, transformer manufacturers often mix copper-clad aluminum wire-wrapped transformers. As a result, when the temperature of the transformer rises, it will fail and cause failure of the power supply and the entire lamp. Therefore, many lamps and lanterns with special built-in power supplies often appear to be out of stock for about 6 months. And how to identify this copper wire is pure copper or copper clad aluminum? Use a lighter to light it up and burn it quickly to make copper clad aluminum. It is also possible to measure the coil resistance to identify it. Third, electrolytic capacitors and chip ceramic capacitors The quality and life requirements of the input electrolytic capacitors may well be known to everyone, and everyone also attaches great importance to it. However, we often ignore the quality requirements of the output capacitor, in fact, the life of the output capacitor has a great impact on the life of the power supply. The output has a switching frequency of up to 60,000 times per second, resulting in increased parasitic parasitic heating of the capacitor, producing a scale-like substance, and finally the electrolyte warms up and explodes. Recommended Output Electrolytic Capacitors: Uses LED-specific electrolysis. General models start with L. At the moment, our output electrolysis is Allianz high-life electrolytic capacitors. Ceramic capacitors: The material is divided into X7R, X5R and Y5V, while the actual capacitance of Y5V can only reach 1/10 of the actual capacitance. The nominal capacitance only refers to working at 0V. So this tiny chip resistor, bad options will also lead to cost price difference and greatly shorten the life of the power supply. 12 Fourth, circuit design and welding process of power products Judgment on the merits of the design: Regardless of the professional perspective, it can be distinguished by some intuitive methods, such as neat layout of components, generous, orderly, and bright and upright welding. A good engineer will not make a messy design. As for the flying line and manual addition of components, it is a serious lack of technical performance. Welding process: manual welding and wave soldering processes, as we all know, the wave soldering process quality of mechanized production is certainly better than manual welding. Identification method: whether there is red plastic on the back. (The solder paste process + welding fixture can also achieve wave soldering, but the cost of fixtures is high). Patch solder joint detection equipment: AOI. This equipment can detect the phenomenon of false soldering, false soldering, and missing solder during the patching process. At present, the lamp has a flashing phenomenon in use for a period of time, which is basically due to the power supply or the lamp beads. And this product's virtual welding detection is extremely difficult to detect through aging, so we must rely on AOI to detect the power of the patch quality. Fifth, batch testing of power products, aging frames and high-temperature aging rooms The best power products controlled by materials and production processes still need to detect aging. Because the incoming inspection of electronic components and transformers is difficult to control. Only through the aging of the entire batch of power supply and high-temperature sampling of high-temperature room, to detect the stability of the quality of the batch of power supply and whether the material has security risks. The role of high-volume high-temperature sampling: At present, the power failure is between 1 in 1 and 1/1, and only thousands of high-temperature aging will find such failure. High-temperature room can simulate the harsh environment of power supply work. Spot check under tightened conditions can find batch problems, such as unreasonable design, poor raw materials, failure in deducing lamps, and high-voltage switch shocks. Long-term aging at room temperature: Screen out random failures such as false welds, missing welds, and collisions to filter out early failures of components and effectively reduce the failure rate of finished products (1% to 1/1000). Normal temperature aging is very time consuming for aging equipment and personnel. The factory that produces 100,000 power supplies per day, aging equipment covers an area of ​​at least 500 square meters, over 10,000 aging points, and realizes the aging of the assembly line. This is rare in the industry.
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