LED驱动器自适应负载匹配技术

Advanced adaptive load matching technology used in LED driver

为了提高LED驱动器与负载的可靠性,提出并实现LED驱动器自适应负载匹配技术.阵列式LED负载在运行过程中由于损坏可能会变成不同结构的负载.在驱动器中建立各种结构负载对应的伏安特性曲线数据库,并确定对应的工作点,使工作点上负载内所有LED的电流不超出额定值.驱动器通过采集负载的电压、电流,并与数据库中各种伏安特性曲线上的电压、电流对比,判断出当前负载的结构,并输出相应的电流,使负载工作在该结构的工作点上,避免负载进一步损坏.采用LLC变换器作为驱动电路,并研究其设计原则.样机及实验验证了该技术的有效性,表明该技术使得驱动器能与负载自动匹配,从而提高驱动器与负载的可靠性.

An adaptive load matching technology used in LED driver was proposed in order to improve the reliability of LED driver and the load.The array LED load＇s structure may change due to the failure during working process. The V-I（voltage-current） property curves of the load with different configurations were explored and used to build an off-line database in the driver.The database also included the working points on the curves,making sure that the currents flow through all LEDs in the load smaller than the rated value.The driver collected the output voltage and output current,and the load structure was detected based on the curves stored in the off-line database.According to the load structure,the output current was adaptively adjusted to make the load at its working point.LLC converter was used in the driver as driving circuit whose design principle was investigated.A prototype was tested under different mismatching cases.Results verify the effectiveness of the proposed adaptive load matching technology,indicating that this technology can improve the reliability of the driver and the load by making the driver match the load automatically.