The application of LED power supply is more and more extensive. More and more people want to know how to identify the quality of LED power supply. The following is a brief introduction.
First, the driver chip
The core of the IC driver power supply is the IC. The quality of the IC directly affects the entire power supply. The IC on the LED power supply refuses to be polished, so that the lighting manufacturer can understand the cost of the IC solution and the accounting driver, and purchase the power supply product at a reasonable price.
Second, the transformer
The control chip can be regarded as the brain center of the power supply, and the power, temperature resistance, etc. are the transformers. The transformer is responsible for completing the "AC-Magnetic-DC" and the energy overload will saturate the bomber. The core of the transformer is the core and the wire package.
Third, electrolytic capacitors and chip ceramic capacitors
The quality and life requirements of the input electrolytic capacitors may be known to everyone, and everyone pays great attention to them. However, people often ignore the quality requirements of the output capacitor. In fact, the life of the output capacitor has a great influence on the life of the power supply. The output has a switching frequency of up to 60,000 times per second, which causes the parasitic resistance of the capacitor to heat up, producing a scale-like substance, and finally the electrolyte heats up and bursts. Ceramic capacitors: The material is divided into X7R, X5R and Y5V, and the actual capacitance of Y5V can only reach 1/10 of the actual value. The nominal capacitance only refers to the operation at 0 volts. Therefore, this tiny chip resistor, poor options will also lead to cost price differences and greatly shorten the life of the power supply.
Fourth, circuit design and soldering process for power products
Judging the pros and cons of design: Aside from the professional point of view, it can be distinguished by some intuitive methods, such as neat, generous, orderly, and clean and straight. A good engineer will not make a messy design. As for flying lines and manual components, it is a serious lack of technical strength. Welding process: manual welding and wave soldering process. It is well known that the quality of wave soldering process in mechanized production is definitely better than manual soldering. Discrimination: Whether there is red glue on the back. .
At present, the flashing phenomenon of the lamp during use for a period of time is basically caused by the power supply or the bead welding of the lamp bead. The virtual soldering inspection of the product is extremely difficult to pass the aging test, so it is necessary to rely on the AOI to detect the quality of the power patch.
Fifth, batch testing of power products, aging racks and high temperature aging rooms
The best power products controlled by materials and production processes still need to be tested for aging. Because incoming inspection of electronic components and transformers is difficult to control. Only through the aging of the entire batch of power and the high temperature sampling of the high temperature room, the quality stability of the batch power supply and the safety of the materials are detected.
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