[Text / reporter Xiong Yuheng] "One person, one lamp, one lamp," This is the beginning of LED lighting, everyone expects the life of LED lighting is 100,000 hours. However, in actual use, LED lamps are very difficult to achieve 50,000 hours, and it is not easy to achieve 30,000 hours. What is the shortening of the life of LED lamps? The answer that the industry agrees with is directed at the drive power.
The reporter also confirmed from the relevant testing agencies that more than 90% of the current LED lighting users' faults are caused by the LED driving power supply. Therefore, "how to solve the problem of the life of the driving power supply" is very important in the current situation. Because as long as the life of the power supply is solved, the life of the LED lighting fixture will no longer exist.
At the 2014 High-tech LED Annual Meeting, the “Intelligent Lighting Mining Your Next Gold Mine†sub-forum named by Zhongheng Paiwei Power, Luo Wei, Technical Director of Zhaoqing Emerald Electronic Technology Co., Ltd. pointed out that it affects the life of LED power supply. The key lies in the quality of electrolytic capacitors. The use of solid electrolytic capacitors instead of traditional liquid electrolytic capacitors can effectively improve the life of power supplies and solve the problem of lamp life.
Capacitor into power life killer
"In the entire LED lighting industry, basically all engineers will think that the life of the LED whole lamp depends on the driving power supply, and the short board of the driving power supply is above its built-in capacitor." Chen Yaohua, engineer of the Laiford Optoelectronics Marketing Department, told Reporter, capacitor is the shortest life of all components in power products, and it is a "short board" in the life barrel effect.
"At present, there are many types of capacitors in the driving power supply, including electrolytic capacitors, chip capacitors, and ceramic capacitors, but the main factor affecting the life is electrolytic capacitors." Luo Wei said, in addition, the driving power supply There are also a variety of capacitors, such as tantalum capacitors, solid capacitors, etc., but most of the current power supply products can not leave the electrolytic capacitor.
"This is closely related to the special structure of the capacitor. Because the electrolytic capacitor is a traditional liquid capacitor, it uses liquid as a conductive material. Therefore, in the later use, with the gradual evaporation and consumption of the conductive liquid, its life will slowly Toward exhaustion." Luo Wei told reporters that the liquid in the high temperature state will lead to the electrode drying out, resulting in a short life.
Luo Wei also mentioned that liquid capacitors can not escape the physical characteristics of thermal expansion, so there is a danger of liquid leakage. In addition, the performance of the capacitor in a harsh environment will be affected. In the high temperature, its life will be shortened rapidly. Under extremely low temperature conditions, the liquid capacitor will have a short board, such as the activity will be weak, and the Electrical performance will be Will weaken.
Dr. Yang Zhichao, Mosuo Power LED Indoor Drive Division, also told reporters, "Although the production process, the use environment and other factors will have a certain impact on the life of the power supply, as far as the overall market situation is concerned, it still has a decisive influence on the power supply life. It is an electrolytic capacitor."
Solid capacitors are preferred
In order to ensure the long life of the drive power, we must first solve the problem of capacitance. Since liquid capacitors have many disadvantages, choosing solid capacitors is the best choice.
In Luo Wei's view, only the use of solid capacitors can completely solve the impact of electrolytic capacitors on the LED drive power and LED lamp life and characteristics. "Solid-state capacitors rely on solid conductive polymers as the electrolyte to conduct electricity. The conductive mechanism relies on electrons for conduction, superior conductivity, superior overall performance, and no electrolyte leakage, safety and long life.
"With solid capacitors, the short life of the power supply will no longer depend on the capacitors, because our solid capacitors pass the relevant experimental tests at 125 ° C, there will be no abnormalities in 7000 hours, and the theoretical lifetime is very long. Luo Wei told reporters that in the past few decades, the calculation formula of power life is based on the life of the capacitor as the calculation standard. The use of solid capacitors will rewrite this history.
It is reported that the life cycle calculation formula of solid capacitors is that the temperature is increased by 10 times for every 20 °C decrease in temperature, while the conventional liquid capacitors only increase the life by only 2 times for every 10 °C decrease in temperature. Therefore, the application of solid capacitors to LED drive power supplies is basically infinite.
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