Safe and efficient constant current drive for high power LED applications

In 2008 Chinese LED constant current source driver chip market developed rapidly, product output continues to expand, the national industrial policy to encourage the LED constant current source driver chip industry to develop high-tech products, domestic enterprises of new investment projects gradually increased. Investors in the LED constant current driver for the attention of the industry more and more Mitch, which makes the LED constant current drive the development of the chip industry increased demand.

Although it is not a large-scale high power LED to replace the traditional incandescent lamp, but they are in the indoor and outdoor decoration, special lighting has been more and more widely applied, therefore grasp the design technology of high power LED constant current source driver, to develop new applications of high power LED is essential. High power LED in the Beijing Olympic Games a large number of applications, indicating that LED lighting technology in the electronics and lighting industry development prospects are very broad.

In the field of LED lighting, in order to reflect the characteristics of energy saving and long life, it is very important to select LED constant current driver. Constant current drive and improve the optical efficiency of LED is the two key issues in the design of LED applications, there is no good driver matching, LED lighting can not reflect the advantages of.

The basic function of constant current driver is constant current, but a good constant current driver in addition to constant current, it should be safe and efficient. Safety refers to the safe and reliable work, high efficiency refers to energy efficient. In recent years, LED in the promotion and application of the failure rate is very high, in addition to some LED chips have quality problems, constant current source performance is also an important reason for poor.

In order to meet the requirements of high power LED for constant current driver, three aspects should be strengthened in the design of constant current driver:

1 improve the protection function, improve work reliability

2 continuously improve the conversion efficiency of constant current driver

3 continuously improve cost-effective

LED driver is only a small part of the cost of LED lighting system, but it is related to the reliability of the whole system performance. High power LED driver with the city need to solve the problem of low voltage and constant current, but also have a relatively high conversion efficiency, small size, long working life, low cost, anti electromagnetic interference, power and other issues. Therefore, to promote the application of large power LED research, we must strengthen the safety high constant current drive.

Note: This article is based on the report of the Beijing municipal lighting company, Mr. Zhong Jinyuan, on the Cross Strait Symposium on lighting technology and marketing

Source: China Semiconductor Lighting Network