公开(公告)号：US10986713B2

公开(公告)日：2021-04-20

申请号：US16633246

申请日：2018-07-23

申请人： SIGNIFY HOLDING B.V.

发明人： Dmytro Viktorovych Malyna ,  Luna X. Zhang ,  Yuangiang Liu ,  Gu Yuan Chen ,  Yun Fei Duan ,  Tijmen Cornelis Van Bodegraven ,  Jie Fu ,  Zhi Quan Chen ,  Shiguang Sun ,  Raimundo De Heer Galisteo ,  Marcus Cornelis Van Meel

IPC分类号： H05B45/35 ,  H05B45/48 ,  H05B45/3578 ,  H05B45/37 ,  H05B45/54 ,  H05B45/345

摘要： A retrofit lamp is to be used with a ballast. A shunt switch is provided in parallel with an output load and is adapted to shunt input terminals of the lamp using pulse width control so as to tune the current through the lighting element. This current control is used to enable compatibility with different ballasts and to provide dimming control. A detection circuit is used to detect an abnormal drive condition of the retrofit lamp and the pulse width control of the shunt switch can then be overridden by holding the shunt switch at a stable state for a certain duration. This prevents overload conditions and avoids DC signals in the event of component failures.