Signify Holding B.v.

Yun Fei Duan

Jie Fu

Zhi Quan Chen

Dmytro Viktorovych Malyna

Zhong Shi Wang

Tijmen Cornelis Van Bodegraven

Xiaoqing Duan

Raimundo De Heer Galisteo

Marcus Cornelis Van Meel

Yong Joon Hwang

Shiguang Sun

Wang Li

Luna X Zhang

Mo Ling Gen

Steven Fei

Yuangiang Liu

Gu Yuan Chen

Wang Tzu Wei

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.

Retrofit lamp and a lighting system using the same

LED bulb

Growing community of inventors

Shanghai, China

Yun Fei Duan