Signify Holding B.v.

Luna X Zhang

Dmytro Viktorovych Malyna

Tijmen Cornelis Van Bodegraven

Marcus Cornelis Van Meel

Raimundo De Heer Galisteo

Jie Fu

Zhi Quan Chen

Yuanqiang Liu

Shiguang Sun

Yun Fei Duan

Gu Yuan Chen

Yuangiang Liu

A retrofit Light Emitting Diode, LED, lighting device for connection to a ballast, wherein said ballast is arranged to be connected to a mains voltage and arranged to provide for a ballast current, wherein said LED lighting device is arranged to detect a dip in said mains voltage using a zero current detector.

Retrofit light emitting diode, LED, lighting device for connection to a ballast, wherein said LED lighting device is arranged to detect a dip in said mains voltage using a zero current detector

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

Growing community of inventors

Eindhoven, Netherlands

Luna X Zhang