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How to judge the quality of LED driver power supply?

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.05.08
LED driver power supply is a type of power supply, which is just a specific type of power supply. This type of power supply drives LED lighting with voltage or current, and is one of the reliable power supply devices. How to judge the quality of LED driver power supply? In response to this issue, this article will provide a detailed introduction for everyone.


High power LED driver power supply

How to judge the quality of LED driver power supply?

1. Driver chip: IC

The center of the LED driver power supply is the IC, and the quality of the IC directly affects the entire power supply. The driving ICs of large factories are all acquired by Jingyuan in search of large packaging factories to package; The driving IC skills of small factories are to directly copy the driving planning plan of large factories and find small packaging factories to package, which cannot guarantee the consistency and stability of the entire batch of ICs, and then cause the driving power supply to mysteriously fail after being used for a period of time. So the IC on the LED driver power supply refuses to be polished, so that the lamp manufacturer can know the IC plan and calculate the cost of the driver, and achieve a reasonable quotation to purchase power products.

2. Transformer

The control chip can be seen as the brain center of the power supply, while the resolution of power, temperature resistance, and other factors are transformers. The transformer is responsible for completing the "AC magnetic DC power" function, and the energy overload will fully explode the machine. The center that makes up the transformer is the magnetic core and wire package.
The quality of the magnetic core is the center of the transformer, but like porcelain, it is extremely difficult to distinguish. The simple appearance differentiation is: brittle, dense, and bright in appearance, and those with air holes polished on the back together are considered high-quality. The current magnetic core used by Shanghai Nuoyi is a molded PC44 magnetic core, ensuring high power supply.

The wire bundle is made of copper wire winding, and the quality of the copper wire used is the key to affecting the lifespan of the transformer. Copper clad aluminum wire of the same length is quoted as 1/4 of pure copper wire. Due to cost pressures, transformer manufacturers usually mix copper clad aluminum wire wrapped transformers inside. Then it causes the transformer to burn and fail when the temperature rises, resulting in the failure of the power supply and the entire lamp. So many lighting fixtures, especially those with built-in power supply, usually take 6 months to be shipped and present a explosive appearance. 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, resulting in copper coated aluminum. It is also possible to measure the resistance of the coil for identification.

3. Electrolytic capacitors and SMT ceramic capacitors

We all know the quality and lifespan requirements of input electrolytic capacitors, and we attach great importance to them. But we usually ignore 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, causing the parasitic resistance of the capacitor to heat up, resulting in substances similar to scale. After quenching, the electrolyte heats up and bursts. Recommended output electrolytic capacitor: LED electrolytic capacitor is selected, usually of Lzui type. Currently, our output electrolyzers are all of Aihua's high lifespan electrolytic capacitors.

Ceramic capacitors: The raw materials are divided into X7R, X5R, and Y5V, while the practical capacitance value of Y5V can only reach 1/10 of the practical value, and the nominal capacitance value only refers to the operation at 0V. So this tiny SMT resistor, with poor options, can also result in a cost difference and greatly shorten the lifespan of the power supply.

4. Circuit planning and welding technology for LED driver power supply products

Distinguishing between good and bad planning: Setting aside professional perspectives, it can be distinguished through some intuitive methods, such as orderly, generous, and orderly component planning, and bright and upright solder joints. An engineer is not capable of making disorganized plans. As for flying wires, craftsmanship and components, they are a serious manifestation of a lack of skill strength.

Welding technology: Craft welding and wave soldering technology are well-known, and the quality of wave soldering technology in mechanized production is definitely better than that of craft welding. Distinguishing method: Is there red glue on the back. (Solder paste technology and welding fixtures can also complete wave soldering, but the cost of the fixture is high).

Solder joint detection instrument for SMT: AOI. This device can detect the appearance of virtual soldering, false soldering, and missed soldering during the SMT process.

The current lighting fixtures exhibit a flashing appearance after being used for a period of time, which is basically caused by the power supply or loose soldering of the lamp beads. The virtual 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 surface mount.

5. Batch testing of aging racks and high-temperature aging rooms for power supply products

No matter how well the materials and production technology are controlled, LED driver power products still require aging detection. Due to the difficulty in controlling incoming inspection of electronic components and transformers. As long as the entire batch of power supplies undergoes aging and high-temperature sampling in the high-temperature room, the quality stability of this batch of power supplies and whether there are safety hazards in the materials can be tested.

The effect of large-scale high-temperature sampling: The current failure rate of the power supply is between 0.1% and 1%, and this type of failure will only be detected after thousands of high-temperature aging.

High temperature rooms can mimic the harsh environment of power supply operations. Under stricter sampling conditions, batch problems can be discovered, such as unreasonable planning, poor raw materials, failure of simulated lighting fixtures, and high-voltage switch impacts.

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

The above article on how to judge the quality of LED driver power supply has been shared with you here, hoping to be helpful to you.
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