Disadvantages of LED power drivers

by:MOSO     2019-12-13
Reasons for the lack of LED driving power: (1) The technical staff of the company that produces LED lighting and related products does not know enough about the switching power supply, and the power supply made can work normally, but some key evaluations and electromagnetic compatibility considerations are not enough There are still some hidden dangers; (2) Most LED power supply manufacturers have transformed from ordinary switching power supplies to make LED power supplies, and they do not know enough about the characteristics and use of LEDs; (3) There are almost no standards for LEDs. Some are based on standards for switching power supplies and electronic rectifiers; (4) Most LED power supplies are not uniform, so most of them are relatively small. If the purchase volume is small, the price is high, and the component suppliers are not very cooperative; (5) LED power stability: Wide voltage input, high temperature and low temperature work, over temperature, over voltage protection and other issues have not been solved one by one ; First is the overall life of the driving circuit, especially the life of key components such as: The life of the capacitor at high temperatures directly affects the life of the power supply; Second, LED drivers should challenge higher conversion efficiency, especially when driving high-power LED , Because all the power that is not used as light output is dissipated as heat, the power conversion efficiency is too low, which affects the performance of LED energy saving effects; in applications with low power (1-5W), the cost of constant current drive power The proportion has been close to 1/3, which is close to the cost of the light source, which has affected the market promotion to a certain extent. 14W High Efficiency LED Driver Power Design I. Design Features 1.High ambient temperature (75 degrees) 2.High energy efficiency 3. Complies with EU CoC / CEC 2008 / Energy Star 2.0 requirements, with high efficiency in load mode (up to 86%, 79.6% required); no-load input power at 250 VAC input <250 mW, 300 mW required 4. Hysteresis thermal shutdown protection 5.Load disconnect protection 6. Full EN55015B conducted EMI limit, EMI margin> 8 dB microvolt
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