一种直流LED恒流源电路分析与研究

Analysis and research of a LED constant current DC power supply module

LED光源是一种节能、环保的新型光源,目前以其耗电少、亮度高、寿命长等优点逐渐进入了如城市景观照明、道路交通系统等日常生活的方方面面,并将成为未来照明的发展趋势。LED光源对电源的稳定性要求较高,电源供电不稳定,将会导致LED发光效率降低,寿命缩短甚至损坏。分析了一种直流LED恒流源,它是由集成芯片TL494组成的脉冲调制电路控制的电感型BOOST升压驱动电路,可同时为多只LED灯提供恒定电流,具有一定的应用参考价值。

LED light source is a kind of energy-saving and environmental protection new light source with the advantages of less power consumption, high brightness, long life and others. At present, LED light source has gradually applied to the city landscape lighting, road traffic system and other aspects of daily life, and will be the future development trend of lighting. LED light source has high demand on the stability of the power. The unstable power supply may cause the low luminous efficiency of LED, and shorten the life span or even damage the LED. An LED DC constant current source was analyzed, which was composed of integrated chip TL494 with pulse modulation circuit to control the inductance type BOOST drive circuit. The LED DC constant current source could supply constant current for multiple LED lights with a certain reference value.