At the same time as the LED shines, LED drive power supply | regulator is the protection of the development of the LED industry chain, LED power quality directly constrain the reliability of led products, therefore, in the LED industry chain gradually improved today, LED The maturity of the drive power is also crucial. As far as LED power companies are concerned, the growth rate of the high-power power supply market around 100W in 2009 will be greatly improved. LED lights sourced from about 100W have more outstanding cost performance compared with traditional lighting sources, and soon formed an industrial-scale LED street lighting and landscape lighting market.
Since the LED is a characteristic-sensitive semiconductor device and has a negative temperature characteristic, a stable operation state and protection are required in the application process, thereby creating a concept of driving. The LED device's requirements for the driving power supply are almost harsh. The LED, like an ordinary incandescent light bulb, can directly connect to 220V AC commercial power. The LED is a low voltage driver of 2 to 3 volts. It is necessary to design a complicated conversion circuit. Different types of LED lamps must be equipped with different power adapters. In the international market, foreign customers have very high requirements on efficiency conversion, effective power, constant current accuracy, power supply life, and electromagnetic compatibility of LED driving power. Designing a good power supply must take these factors into consideration, because the power supply is in the entire luminaire. Its role is just as important as the human heart.
In 2009, aside from the impact of the financial crisis on the world economy, the demand for high-power LED power supplies in Europe and the United States and other international markets was still very large, and the corresponding export volume of high-end LED products was less affected by the financial crisis. In 2008, the output value of LED application products in Mainland China has exceeded RMB 45 billion. LED demonstration application street lamps and LED full-color displays | display devices, solar LED, landscape lighting, consumer electronics backlight, signals, indications and other applications are still the main application areas. However, in the context of a prosperous mainland market, the quality of LED products is uneven, and the requirements for driving power are confusing. This is also a major factor in the reshuffle of LED companies in recent months. With the development of LED products in the mainland market in full swing, LED drive power companies currently face several challenges. The first is the overall life of the driver circuit. In particular, the life of a critical device such as a capacitor at high temperatures directly affects the life of the power supply. Secondly, LED drivers should challenge higher conversion efficiency, especially when driving high-power LEDs, because all power that is not used as light output is dissipated as heat, and the power conversion efficiency is too low, which affects the energy-saving effect of LEDs. The play. Third, dimming the LED with high efficiency at a large dimming ratio while ensuring constant color characteristics at high and low luminance. At the same time, it is necessary to reduce costs. At present, in applications with low power (1-5W), the proportion of the cost of constant-current driving power is already close to 1/3, which is close to the cost of the light source, which has affected the market promotion to some extent.
February 17, 2023
