The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 20, 2021
Filed:
Jul. 23, 2018
Signify Holding B.v., Eindhoven, NL;
Dmytro Viktorovych Malyna, Achel, BE;
Luna X. Zhang, Eindhoven, NL;
Yuangiang Liu, Shanghai, CN;
Gu Yuan Chen, Eindhoven, NL;
Yun Fei Duan, Shanghai, CN;
Tijmen Cornelis Van Bodegraven, Eindhoven, NL;
Jie Fu, Shanghai, CN;
Zhi Quan Chen, Shanghai, CN;
Shiguang Sun, Shanghai, CN;
Raimundo De Heer Galisteo, Uden, NL;
Marcus Cornelis Van Meel, Helmond, NL;
SIGNIFY HOLDING B.V., Eindhoven, NL;
Abstract
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.