公开(公告)号：US08963430B2

公开(公告)日：2015-02-24

申请号：US13451457

申请日：2012-04-19

Applicant: James T Walker

Inventor： James T Walker

IPC: H05B37/02 ,  H05B33/08

CPC classification number: H05B33/0893

Abstract: A circuit is disclosed for determining which of a multiplicity of LED strings in an illumination system has a fault. A group of circuits determines the maximum, minimum, midpoint between maximum and minimum, and average voltage of the group of LED string voltages in use, and examines the statistical properties of the LED string voltages. Comparators are used to find the strings which have the highest and lowest operating voltages, and to compare the midpoint and average voltages to determine whether the highest or lowest voltage string is responsible for causing a fault in the illumination system operation. Memory means are used to keep the said determined string turned off to prevent faulty operation.

Abstract translation: 公开了一种用于确定照明系统中多个LED串中的哪一个具有故障的电路。 一组电路确定最大值和最小值之间的最大值，最小值，最小值以及所使用的LED串电压组的平均电压，并检查LED串电压的统计特性。 比较器用于找到具有最高和最低工作电压的串，并且比较中点和平均电压以确定最高或最低电压串是否导致照明系统操作中的故障。 存储装置用于保持所述确定的字符串被关闭以防止错误的操作。