精品日产一匹二匹三匹四匹五匹-久久冲刺内射高潮-无码熟妇人妻av在线影片软件-新狼窝色AV性久久久久久-精品亚洲成a人片在线观看

After so many years of experience with lighting manufacturers, they often feel that lighting manufacturers do not want to buy good LED power supplies, but rather do not know how to distinguish whether the purchased LED power supplies are good or not, and are also quite concerned about whether they have spent high prices to purchase low-quality LED power supplies. So as a lighting fixture manufacturer, the most difficult feedback is to purchase LED power supplies because the quality of the power supplies is difficult to detect. They have aged for 4 hours in their own factory, and some even aged for 24-72 hours. However, these aged products often exhibit a defect rate of around 5% or higher within 3-6 months of shipment. Often, these adverse situations lead to unbearable suffering for lighting manufacturers, resulting in one customer losing another.

How about identifying the quality of LED power supply? We can identify from the following points:

First: Driver chip - IC

The core of the driving power supply is the IC, and the quality of the IC directly affects the entire power supply. The driver ICs of large factories are all purchased from Jingyuan to find large packaging factories to package; However, the driver IC technology of small factories directly copies the driver design scheme of large factories to find small packaging factories for packaging, which cannot guarantee the consistency and stability of the entire batch of ICs, leading to inexplicable failure of the driver power supply after a period of use. So the IC on the LED power supply refuses to be polished, so that the lamp manufacturer can understand the IC solution and calculate the cost of the driver, and achieve a reasonable price for purchasing power products.

Second: Transformer

The control chip can be seen as the brain center of the power supply, while the transformer determines power, temperature resistance, etc. The transformer is responsible for completing the "alternating current magnetic energy direct current", and energy overload will saturate and explode the machine. The core of the transformer is the magnetic core and wire package.

The quality of the magnetic core is the core of a transformer, but like porcelain, it is extremely difficult to distinguish. The simple appearance recognition is: the appearance is brittle, dense, and bright, and the back is polished with air holes, which is considered a top grade. The magnetic core currently used by Shanghai Nuoyi is a molded PC44 magnetic core, ensuring the high efficiency of the power supply.

The wire bundle is made of copper wire winding, and the quality of using copper wire is the key to affecting the lifespan of the transformer. Copper clad aluminum wire of the same length is 1/4 the price of pure copper wire. Due to cost pressures, transformer manufacturers often mix copper clad aluminum wire wrapped transformers inside. As a result, when the temperature of the transformer rises, it burns out and fails, leading to the failure of the power supply and the entire lamp. So many lighting fixtures, especially those with built-in power supplies, often experience explosive phenomena after about 6 months of shipment. And how to distinguish whether this copper wire is pure copper wire or copper clad aluminum? Use a lighter to ignite it and quickly burn it off, resulting in copper clad aluminum. It is also possible to measure the coil resistance value for identification.

Third: electrolytic capacitor and ceramic chip capacitor

The quality and life requirements of the input electrolytic capacitor may be known to everyone, and everyone also attaches great importance to it. However, people often overlook the quality requirements of the output capacitor, as the lifespan of the output capacitor has a significant impact on the lifespan of the power supply. The output terminal has a switching frequency of up to 60000 times per second, which increases the parasitic resistance of the capacitor and generates substances similar to scale. Finally, the electrolyte heats up and explodes. Recommended output electrolytic capacitor: LED special electrolytic capacitor is used, and the general model starts with L. At present, all of our output electrolytes are Aihua's long-life electrolytic capacitor.

Ceramic capacitors: The materials are divided into X7R, X5R, and Y5V, while the actual capacitance value of Y5V can only reach 1/10 of the actual value, and the nominal capacitance value only refers to working at 0V. So this small chip resistor, with poor options, can also lead to a cost difference and greatly shorten the lifespan of the power supply.

Fourth: Circuit design and welding process of power supply products

Distinguishing the pros and cons of design: Setting aside the professional perspective, it can be distinguished through some intuitive methods, such as neat, generous, orderly component layout, and bright and straight solder joints. An excellent engineer will not make disorderly designs. As for flying wires and manually adding components, it is a serious lack of technical strength.

Welding process: manual welding and wave soldering process. As is well known, the quality of wave soldering process produced by mechanization is definitely better than manual welding. Identification method: Is there any red glue on the back. (Solder paste process and welding fixtures can also achieve wave soldering, but the cost of fixtures is high).

Solder joint detection instrument for SMD: AOI. This device can detect the phenomenon of false soldering, false soldering, and missed soldering during the patch process.

At present, the phenomenon of flashing lights in the use of lamps for a period of time is mainly caused by faulty welding of power supply or lamp beads. The false soldering detection of this product is extremely difficult to detect through aging testing, so it is necessary to rely on AOI to detect the quality of the power supply's chip placement.

Fifth: Batch testing of aging racks and high-temperature aging rooms for power supply products

No matter how well the materials and production process are controlled, power products still need to be tested for aging. Because the incoming inspection of electronic components and transformers is difficult to control. Only through the aging of the entire batch of power supplies and the high-temperature spot check of the high-temperature room, can the quality stability of this batch of power supplies and whether there are safety hazards in the materials be tested.

The role of large-scale high-temperature sampling inspection: Currently, the failure rate of power supply is between 1% to 1%, and only thousands of high-temperature aging will discover such failures.

A high-temperature room can simulate the harsh environment of power supply operation. Under strict conditions, spot checks can identify batch problems, such as unreasonable design, poor raw materials, failure in inferred lighting fixtures, and high-voltage switch impacts.

Long term aging at room temperature: screen out random failures such as solder joints, solder leaks, and collisions, filter out early failures of components, and effectively reduce the failure rate of finished products (from 1% to 1%).

Normal temperature aging consumes a lot of aging equipment and personnel. A factory with a daily output of 100000 power supplies covers an area of at least 500 square meters, exceeding 10000 aging positions, and achieves assembly line aging, which is rare in the industry.