公开(公告)号：US09445478B2

公开(公告)日：2016-09-13

申请号：US14334045

申请日：2014-07-17

申请人： Panasonic Corporation

发明人： Hirofumi Konishi ,  Masanao Okawa ,  Yohei Hayashi ,  Itaru Onishi

IPC分类号： H05B33/08

CPC分类号： H05B33/0896 ,  H05B33/0815

摘要： A light-emitting element lighting device includes: a step-down chopper circuit which outputs a current that flows to a light-emitting element; a current command circuit which selects between a rated mode for passing a rated current for turning ON the light-emitting element and a detection mode for passing an abnormality detection current, which is smaller than the rated current, for detecting an abnormality in the light-emitting element; a voltage detection circuit which detects a voltage across both ends of the light-emitting element; and a control circuit which causes the step-down chopper circuit to stop outputting the current to the light-emitting element, when the voltage across both ends detected by the voltage detection circuit in the detection mode is lower than or equal to an abnormality detection threshold voltage which is set lower than the rated voltage at the time when the light-emitting element is turned ON.

摘要翻译： 发光元件照明装置包括：降压斩波电路，其输出流向发光元件的电流; 电流指令电路，其在用于使用于使发光元件接通的额定电流的额定模式和小于额定电流的异常检测电流的检测模式之间进行选择，用于检测发光元件的异常， 发光元件; 电压检测电路，其检测所述发光元件的两端的电压; 以及当所述检测模式中由所述电压检测电路检测到的两端的电压低于或等于异常检测阈值时，使所述降压斩波电路停止向所述发光元件输出电流的控制电路 电压设定为低于发光元件接通时的额定电压。