How to identify the quality of LED power good or bad? We can do from the following points to identify:
First, the driver chip: IC
The core of the drive power is the IC, the IC's direct impact on the entire power supply. Drivers IC manufacturers are buying Crystal Park looking for a large packaging plant to package; and small plant drive IC technology is copied directly from the drive manufacturers to find a small package design package to package, can not normally protect the entire batch of IC Consistency and stability, resulting in inexplicable failure of the drive after a period of use. Therefore, the IC on the LED power supply, refuse to polish, in order to lighting manufacturers to understand the IC program and accounting drive costs, to achieve a reasonable price for the purchase of power products.
Second, the transformer
Control chip can be regarded as the power of the brain center, and determine the power, temperature and so is the transformer. Transformer responsible for the completion of "AC - magnetic energy - DC", the energy overload will be saturated with the machine. The core of the transformer is composed of core and wire package.
Core quality is the core of the transformer, but as porcelain, very difficult to distinguish. Easy to identify the appearance as: the appearance of crisp, dense, bright, while the back of the ground stomatal for the top grade. At present, Shanghai Connaught core is used to open the mold of the PC44 core, to ensure high efficiency power supply.
Line package is made of copper winding, the quality of the use of copper is the key to the life of the transformer. The same length of copper clad aluminum wire is the price of pure copper 1/4, due to cost pressures, often transformer manufacturers will be mixed with copper clad aluminum line transformer inside. Resulting in burned failure when the transformer temperature increases, resulting in failure of the power and the entire lamp. So a lot of lamps and lanterns, especially built-in power lamps, often appear to ship about 6 months, the phenomenon of the machine. How to identify the copper wire is pure copper or copper clad aluminum it? Use the lighter to light, quick blow is the copper clad aluminum. You can also measure the coil resistance to identify.
Third, electrolytic capacitors and ceramic capacitors
Input electrolytic capacitor quality and life expectancy may we all know, we also attach great importance. However, we often ignore the quality requirements of the output capacitor, in fact, the life of the output capacitor greatly affect the life of the power supply. The output of up to 60,000 times per second switching frequency, resulting in capacitance parasitic resistance heating increases, resulting in a scale-like material, and finally the electrolyte temperature, explosion. Recommended output electrolytic capacitor: The use of LED-specific electrolysis, the general model to L at the beginning. At present, our output electrolysis is Aihua high-life electrolytic capacitor.
Ceramic capacitors: The material is divided into X7R, X5R and Y5V, while the actual value of Y5V can only reach the actual 1/10, the nominal capacitance refers only to work at 0 volts. So this tiny chip resistors, bad options can also lead to cost price differences and greatly shorten the life of the power supply.
Fourth, the power product circuit design and welding process
Discrimination of the pros and cons of design: aside from a professional point of view, can be resolved through some intuitive methods, such as the layout of the components neat, generous, orderly, bright and straight solder joints bright and clean. A good engineer will not make a cluttered design. As for the fly line, hand-added components, but also a serious lack of technical performance.
Welding processes: manual welding and wave soldering process, is well known that the mechanical production of wave soldering process quality is definitely better than manual welding. Discrimination: whether there is a red gum on the back. (Solder paste welding process can also be achieved wave soldering, but the high cost of governance).
Patch welding spot detection equipment: AOI. The device can detect the welding process in the Weld, false welding, missed welding phenomenon.
At present, the lamp is flashing for a period of time, which is basically caused by the power source or lamp bead welding. Weld testing of this product is extremely difficult to detect by aging, so it is necessary to rely on the AOI to test the power quality of the patch.
Fifth, bulk testing of power products aging rack and high temperature aging room
Material and production process control of the best power products, or the need to detect aging. Because incoming electronic components and transformers detection is difficult to control. Only through the entire batch of power aging and high temperature room temperature sampling, to detect the stability of the quality of the batch power supply and whether the material has potential safety problems.
The role of high-temperature sampling: the current power failure is between 1 to 1 percent, only thousands of high-temperature aging will find such failure.
High-temperature room can simulate the harsh environment of power supply, sampling in the tightened conditions, you can find bulk problems, such as the design is unreasonable, poor raw materials, deduced failure of lamps and lanterns, high-voltage switch impact.
Aging at room temperature for a long time: Screening out random failures such as Weld, Leak, and Collision, early failure of filter components, effectively reducing the failure rate of finished products (one percent down to one thousandth).
Aging at room temperature is very costly aging equipment and personnel, Nissan 100,000 power plant, aging equipment covers an area of ​​at least 500 square meters, more than 10,000 aging bits, and to achieve pipeline aging, the industry rarely.
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